China's lack of water has become an indisputable fact of the consensus of the Chinese people. The annual area of ​​farmland in the country accounts for 25% to 30% of the total cultivated land area. The annual water shortage in the irrigation area is about 30 billion m 3 , and the annual harvest of food is tens of billions of kilograms due to drought. Nearly two-thirds of the country's water supply is insufficient. The annual water shortage is about 6 billion m 3 , affecting the industrial output value of more than 20 billion yuan every year.
Especially in recent years, Shandong Peninsula drought, declining water table, especially in Zhaoyuan gold mine water shortage is serious. Zhaoyuan Gold Mine has a daily handling capacity of 300,000 tons of ore, 3.2m 3 /t of ore dressing , and 960,000 m 3 of water per day. The mining production capacity of Hebei Gold Mine of Zhaojin Mining Co., Ltd. is 1000t/d, only for the day. process water consumption reached 3200m 3, together with the domestic water 600m 3 / d, east gold reached 3800m 3 water per day. To this end, how to make full use of the water resources of Hedong Gold Mine, implement sustainable development of mines, and reduce production costs have become an urgent problem to be solved in Hedong Gold Mine.
First, the type of wastewater and flow
There are two main water sources in Hedong Gold Mine. The first is the mining well water, which is about 500m 3 /d. The other water is taken from the Dujia water source 15km away from the mine. The cost of water is about 3 yuan / t. The cost is more than 3.4 million yuan. The wastewater utilization rate of the concentrator is low, and a large amount of water that can be reused is wasted. Therefore, the reuse of ore dressing wastewater is of great significance to the Hedong Gold Mine. At present, there are five kinds of wastewaters, namely, the underground drainage produced during mining (referred to as underground water), the water of the tailings dam (referred to as tailings water), the overflow water of the thickener during concentrate concentration (referred to as concentrate water), Hedong. The water in another mining area near the gold mine (referred to as 953 mining water), flushing ground and other miscellaneous water flowing into the pool next to the mine can be used as backwater (referred to as reservoir water) after settlement. This part of the water is used when the water is insufficient. The water content of various wastewaters in Hedong Gold Mine is shown in Table 1.
Table 1 Hedong Gold Mine Wastewater Volume
Water source | Underground water | Tailings water | Concentrate water | 953 mining water | Reservoir water |
Water volume / (m 3 · d -1 ) | 500 | 2700 | 210 | 300 | 100 |
In this study, a total of 7 kinds of water samples were taken. In addition to the above five types, there are also domestic water in Hedong Gold Mine (referred to as domestic water) and integrated water. The comprehensive water refers to the water in the total pool of Hedong Gold Mine Concentrator, mainly water source. There is also some other water entering the water mixed with the ground water and the downhole water. A representative water sample was taken for testing.
2. Analysis of wastewater quality in Hedong Gold Mine
In order to understand the different wastewater quality of Hedong Gold Mine, the different wastewater quality of Hedong Gold Mine were analyzed separately. Ten indicators were tested for each type of water. The turbidity was measured by spectrophotometer, and the suspended solids were filtered. Shake the water sample. The sampling of other indicators is the supernatant after sedimentation. The cation was measured by atomic absorption method and the anion was chromatographed. The test results are shown in Table 2. As can be seen from Table 2, the composition of different types of water has a large difference. The difference in pH value is small, generally in the neutral or weakly alkaline range. The highest pH value is the domestic water in the mining area, reaching 8.25, and the mineral water with the lowest pH value is 7.33. The conductivity of all waters is relatively high, the lowest domestic water consumption is also 894μS/cm, the other water is above 1000μS/cm, and the highest is the mining well water, reaching 1433μS/cm, indicating that the ion content in the water is relatively high, mainly The ions are cations such as calcium and magnesium, and anions such as sulfate or bicarbonate. The iron and copper ion content is very low, indicating that all water has a high hardness. However, the calcium and magnesium contents of different waters also differ, and the difference in magnesium content is small, ranging from 26.5 to 35.4 mg/L. The calcium content is quite different. The lowest tailing water is only 47.5mg/L, and the highest downhole water is 172.0mg/L. The difference in turbidity in different waters is also relatively large. The lowest domestic water is only 2.5 degrees, and the highest is concentrate water, reaching 131.2 degrees. The water with higher turbidity is downhole water, concentrate water and integrated water. The change rule of solid suspended matter is basically the same as the turbidity. The highest suspended solid content is concentrate water, which is 256.0mg/L, followed by downhole water and comprehensive shui. The suspended solid content exceeds 100mg/L.
Table 2 Water quality analysis of Hedong gold mine wastewater (mg/L)
project Water sample | pH | Conductivity / (μS · cm -1 ) | Suspended matter | Turbidity/degree | CaO | MgO | Fe | Cu | SO 4 2- | HCO 3 - |
Living water Reservoir water Underground water 953 mining water Concentrate water Tailings water Integrated water | 8.25 7.44 7.74 8.04 7.33 7.58 8.07 | 894 1056 1433 1025 1205 1262 1145 | 2.5 32.1 101.0 35.2 265.0 65.0 100.2 | 2.5 16.8 89.0 17.7 131.2 13.3 53.8 | 91.3 94.9 172.0 132.5 120.5 47.5 148.5 | 27.3 33.4 32.7 33.4 30.1 26.5 35.4 | 0.25 0.05 0.05 0.05 0.08 0.05 0.05 | 0.025 0.025 0.025 0.025 0.025 0.025 0.025 | 91.3 217.3 265.3 162.7 249.7 236.0 190.3 | 179.0 76.0 158.0 178.0 156.0 109.0 165.0 |
Third, the sample taken and particle size analysis
The test was taken from the overflow of the classifier of Hedong Gold Mine. After the slurry was tested, it was set aside and dried. The mixture was subdivided into 1 kg of spare parts. The test was further reduced to the required quality as needed. The ore size analysis and metal distribution are shown in Table 3.
Table 3 Raw ore size analysis and metal distribution
Size/mm | Yield/% | Gold grade / (g·t -1 ) | Gold distribution rate /% | ||
single | accumulation | single | accumulation | ||
+0.4 -0.4+0.3 -0.3+0.15 -0.15+0.10 -0.10+0.074 -0.074+0.038 -0.038 Total | 1.83 5.22 16.47 19.90 8.80 19.09 28.69 100.0 | 1.83 7.05 23.25 43.42 52.22 71.31 100.0 | 0.30 0.25 0.80 1.80 3.45 6.0 3.25 2.88 | 0.19 0.45 4.56 12.39 10.51 39.63 32.27 100.0 | 0.19 0.64 5.20 17.59 28.10 67.73 100.0 |
Fourth, test methods and processes
The key to the reuse of ore dressing wastewater is whether the ions and suspended solids in the wastewater have an effect on the beneficiation process. Therefore, different types of water were tested in the laboratory. In order to examine in detail the effects of water quality, the experiment was carried out under the conditions of different collector dosages. The ratio of the two collectors in the test was kept at 3:1 ratio of isoamyl xanthate to butylammonium black medicine. When the amount of collector changes, the total amount is changed, and the ratio of the two remains unchanged. The ratio of rough selection and sweep selection is maintained at 2:1. The test used a 1 L flotation machine, and each sample was used in an amount of 200 g.
V. Analysis of test results of different water samples
(1) On-site domestic water test
First, the test was carried out with on-site domestic water. The results are shown in Table 4. The purpose of the test is to first obtain the indicators in the laboratory that are similar to the actual production, and then examine the effects of different types of water on the beneficiation process. This is a comparison for the standard.
Table 4 Test results of domestic water collectors in Hedong Gold Mine
Collector dosage / (g·t -1 ) | product name | Yield/% | Grade / (g·t -1 ) | Recovery rate/% |
20 | Concentrate Tailings Raw ore | 3.65 96.35 100.0 | 56.84 0.29 2.35 | 88.12 11.88 100.0 |
40 | Concentrate Tailings Raw ore | 3.87 96.13 100.0 | 55.01 0.22 2.34 | 90.97 9.03 100.0 |
60 | Concentrate Tailings Raw ore | 4.14 95.26 100.0 | 54.21 0.20 2.34 | 91.87 8.13 100.0 |
80 | Concentrate Tailings Raw ore | 5.09 94.91 100.0 | 41.91 0.16 2.27 | 93.30 6.70 100.0 |
It can be seen from Table 4 that with the increase of the amount of collector, the yield of flotation concentrate increases. When the amount of collector is 20g/t, the yield of concentrate is 3.55%, and the dosage is increased to 80g/t. At the time, the yield of the concentrate increased to 5.30%. The grade of the concentrate decreased with the increase of the amount of the collector, and it was obvious that the concentrate grade was 57.48 g/t when the dosage was 20 g/t. When the dosage was increased to 80 g/t, the concentrate grade dropped to 41.74 g/ t. The grade of tailings also decreases with the increase of the amount of collector. When the dosage is increased to 80g/t, the grade of tailings drops to 0.15g/t, which is similar to the actual production. The recovery rate of gold in the concentrate increased with the increase of the amount of collector. When the dosage was 20g/t, the recovery rate of gold was 88.68%. When the dosage of collector increased to 80g/t, the recovery rate increased to 93.97. % is also close to production. Therefore, it is sufficient to use a collector of 80 g/t under laboratory conditions. The selection of the collector and the crude concentrate obtained by rough selection were carried out in a selective test. The results showed that the gold concentrate with a yield of 2.60%, a gold grade of 96.23% and a recovery rate of 92.55% was obtained once, and the actual production was obtained. The indicators are close. Since the crude ore concentrate yield is too low, it is difficult to carry out the selective test, so only the rough selection and the sweep test are performed when the impact of the wastewater on the beneficiation process is tested. It can be seen from the test results that the same concentrate grade and recovery rate are obtained, and the amount of collector used in the laboratory test is low. The amount of collector used in production is about 120g/t. Figure 1 shows the effect of dosage on concentrate grade and recovery. It can also be seen from Fig. 1 that another feature of the ore flotation in Hedong Gold Mine is that some of the gold-bearing minerals have poor floatability and require more collectors to float, which is expressed as a dosage of 80g. At /t, the grade of the concentrate is significantly reduced, and the increase of the recovery rate is less, indicating that the part of the gold mineral that is difficult to float by flotation is guaranteed to ensure a higher recovery rate, and adding a large amount of the collector will result in more The gangue enters the concentrate and affects the concentrate grade.
Figure 1 Concentrate grade when using the domestic water test in Hedong Gold Mine
And the relationship between recovery rate and collector dosage
(2) Reservoir water impact test
It can be seen from Fig. 2 that the test results with reservoir water are basically the same as the results of the domestic water test. It is also accompanied by an increase in the amount of the chemical, the concentrate grade decreases and the recovery rate increases, compared with the domestic water test results, in different medicaments. The concentrate grade is basically the same when the dosage is used, and the recovery rate is slightly lower, but the difference is less than %. Within the allowable range of the error, it indicates that the reservoir water has little effect on the beneficiation process and can be used directly as the mineral processing water.
Figure 2 Reservoir water collector dosage test and comparison with domestic water
(3) Figure 3 is a comparison of tailings water and domestic water test results. It can be seen from Fig. 3 that the test results obtained by the two kinds of water flotation are basically the same, indicating that the tailing water has no effect on the beneficiation process and can be directly reused.
Figure 3 Tailwater water collector dosage test and comparison with domestic water results
(IV) Water impact test of 953 mining area
Figure 4 is a comparison of water and domestic water test results for the 953 mining area. The test results of the two are basically the same. It shows that the water in the 953 mining area has little influence on the beneficiation process and can be directly reused.
Figure 4 Comparison of water collector dosage and comparison with domestic water results in 953 mining area
(5) Concentrated water impact test
Figure 5 is a comparison of the results of the concentrate water and domestic water test. As can be seen from Figure 5, the concentrate water has a greater impact on the flotation results. When the amount of collector is less than 80g/t, the concentrate grade and recovery rate obtained by flotation with concentrate water is lower than that of domestic water under the same collector dosage, and the smaller the collector is, this is The greater the difference, especially the recovery rate, is more obvious. When the amount of collector is 20g/t, when the concentrate is used for flotation, the concentrate grade is 8.41g/t lower than that of domestic water, and the recovery rate is 4.82% lower. When the amount of collector was increased to 60 g/t, the difference between the two was 8.0 g/t and 1.65%, respectively. When the amount of collector increased to 80 g/t, the difference between the two water flotation results was small. From this analysis, the main consumption of collectors for the flotation of concentrate water, when the amount of collector is low, some of the collector is consumed by the fine particles suspended in the wastewater, so it causes fine Both the grade and recovery rate are reduced. From the results of the water quality analysis shown in Table 2, it can be seen that the concentrate has a high turbidity and is the highest in all waters, and the suspended matter content is also the highest among all the wastewaters. Combined with the analysis of the water quality of tailings water and reservoir water, it can be explained that the mains consumption of the collector in the concentrate water is suspended matter. The influence of other ions is not significant, because the content of other ions in the reservoir water and tailings water is fine. The ore water is similar, and tests have shown that these two waters have no significant effect on flotation.
Figure 5: Concentrate water collector dosage test and comparison with living water results
(6) Downhole water impact test
Figure 6 is a comparison of the results of downhole water and domestic water test. It can be seen that the downhole water also has an impact on the flotation process, and the law of its influence is basically the same as that of the concentrate water. It also reduces the grade and recovery rate of the concentrate when the amount of collector is low, but when the amount of collector is used, When it exceeds 80g/t, its influence basically disappears.
Figure 6 Comparison of the amount of collectors in mining wells and comparison with living water results
(7) Comprehensive water impact test
Figure 7 is a comparison of the results of the combined water and domestic water tests. It can be seen that integrated water also has an impact on the flotation process. The law of its effects is similar to that of concentrate water and downhole water. However, the degree of influence is greater than the former two, especially when the amount of collector is low, the impact on the recovery rate is more obvious. For example, when the amount of collector is 20g/t, the concentrate grade and recovery rate in the domestic water test are respectively At 56.84 g/t and 88.12%, the same collector addition, concentrate grade and recovery were 45.56 g/t and 80.29%, respectively, when tested with integrated water. When the amount of collector is increased to 80 g/t, the difference between the two is small. It shows that the impact of comprehensive water on mineral processing is also the consumption of flotation reagents.
Figure 7 Comparison of combined water collector dosage and domestic water results
Tests have shown that different types of wastewater in Hedong Gold Mine have different effects on flotation. Among them, reservoir water, tailings water and water in 953 mining area have no effect on flotation, and can be directly reused. Concentrate water, downhole water and integrated water all have different effects on flotation, among which concentrate water has the greatest impact. The effect of three kinds of water on flotation is mainly that the suspended matter consumes flotation reagent. When the dosage of the medicament is low, the concentrate grade and recovery rate of flotation are reduced, and the effect of the dosage of the medicament can be eliminated to a certain extent. However, this is only the result of laboratory tests. If it is used in production, it should also take into account the problem of the accumulation of suspended solids. It may not only consume the flotation agent, but may have a greater impact. The wastewater is used after proper treatment.
6. Wastewater sedimentation test
(1) Downhole water sedimentation test
In order to eliminate the influence of suspended solids in the wastewater on the flotation process, sedimentation tests were carried out on the downhole water, concentrate water and integrated water. The purpose was to investigate whether the suspended matter was removed by sedimentation and the effect on flotation was eliminated.
Figure 8 is a graph showing the relationship between the turbidity of the downhole water and the removal rate of the suspended solids and the settling time. It can be seen that most of the suspended solids in the downhole water can be removed by gravity sedimentation. With the increase of sedimentation time, the turbidity of wastewater started to decrease rapidly, and the corresponding removal rate of suspended solids also increased rapidly. However, when the sedimentation time exceeded 135min, the decrease of turbidity became very slow with time. At this time, the turbidity of the wastewater was 28.0 degrees, and the removal rate of the suspended matter was 72.34%. The sedimentation curve shown in Fig. 8 shows that the composition of the suspended solids in the downhole water has a wide particle size, and some of the particles with larger particle diameters settle faster, but there are also some extremely fine particles, and their sedimentation speed is very slow, under static conditions. After 135min sedimentation, it can not be removed. In the water treatment, the particles that can not settle within 120min are called difficult-to-precipitate particles. The test shows that the downhole water contains a considerable amount of difficult-to-precipitate particles. It is difficult to completely remove the hard-to-precipitate particles in the water by gravity sedimentation alone.
Figure 8 Relationship between turbidity and suspended solids removal rate and settlement time in downhole water
(2) Concentrate water sedimentation test
Figure 9 is the relationship between the turbidity and the removal rate of the concentrate water and the sedimentation time. It can be seen that the variation law is basically the same as that of the downhole water, but the degree of change is different, especially when the sedimentation time is short, the turbidity The rate of decrease in speed and the rate of removal of suspended solids is slower. The remaining turbidity of the settlement at the same time is higher than that of the downhole water. After 135 min of sedimentation, the residual turbidity was 66.0 degrees, and the removal rate was 52.11%. With the extension of sedimentation time, the residual turbidity and suspended solids removal rate in wastewater is still increasing, which is greater than that of downhole water and integrated water. It indicates that the fine fraction content of the suspended solids in the concentrate water is higher than that of the downhole water, and the settlement is more difficult.
Fig. 9 Relationship between turbidity and suspended solids removal rate and sedimentation time in concentrate water
(3) Figure 10 shows the relationship between turbidity of integrated water and the removal of suspended solids and sedimentation time. It can be seen that the sedimentation characteristics of the integrated water are significantly different from those of downhole water and concentrate water. When the sedimentation time is less than 135min, the decrease of residual turbidity and the increase of suspended solids removal rate are basically linear with the settlement time, and the subsequent turbidity and suspended matter removal rate change little with the extension of settlement time. When the sedimentation is 135min The remaining turbidity was 27.8 degrees, the removal rate was 55.55%, and the residual turbidity was 24.7 degrees when the sedimentation was 260 minutes, and the removal rate was 61.0%.
Fig. 10 Relationship between residual turbidity and suspended solids removal rate and settlement time in integrated water
Seven, after treatment water test results and analysis
(1) Downhole water test after settlement
In order to investigate whether the water after gravity sedimentation still affects the flotation process, the downhole water is separately settled for 135 minutes, and the supernatant is taken for the flotation collector dosage test. Figure 11 is a comparison with the living water results. It can be seen that the downhole water is subjected to gravity sedimentation treatment, and after removing most of the suspended matter, the influence on the flotation process is substantially eliminated. This shows that the downhole water that has an impact on flotation can be reused after simple gravity sedimentation. It is also proved that the main reason affecting flotation is the suspended matter in the wastewater.
Figure 11 Comparison of the results of the downhole water test after treatment and the results of the living water test
(II) Concentrate water test after sedimentation
Since the concentrate water has a great influence on the flotation process, the content of fine particles is also high. To ensure the sedimentation effect, the sedimentation time is 240 min, and then the supernatant is taken for the flotation collector dosage test, Figure 12 It is a comparison with the results of the living water test. It can be seen that after the sedimentation treatment of the concentrate water to remove the suspended solids, the effect on the flotation can be basically eliminated, but a careful comparison shows that the results of the treated concentrate water test are still different from the results of the living water test. It is mainly manifested in the low concentrate grade when the sedimentary concentrate water test is used, and the recovery rate is slightly higher, indicating that the concentrate water cannot be eliminated from the flotation after sedimentation. In practice, the long-term impact needs to be Further investigation in industrial production.
Figure 12 Comparison of the results of the concentrate water test after settlement and the results of the living water test
(3) Comprehensive water test after settlement
Figure 13 is a comparison of the results of the collector dosage test with the supernatant water after the sedimentation of the integrated water over 150 min and the results of the living water test. It can be seen that the test results of the combined water treatment can be basically the same as the domestic water, and some test results are slightly different, but basically within the allowable range of error, the integrated water after sedimentation can also be As production water for mineral processing.
Figure 13 Comparison of integrated water test results after settlement and comparison with living water test results
It can be seen from the test that the downhole water, the concentrate water and the integrated water which have an influence on the flotation process can basically eliminate the influence after the gravity sedimentation removes the suspended matter therein. Gravity sedimentation is also the simplest and lowest cost method in water treatment. Therefore, it is recommended to use gravity sedimentation method to treat downhole water and concentrate water. Since the integrated water contains downhole water and concentrate water, the effects of integrated water can be eliminated as long as the effects of concentrate water and downhole water are eliminated. Because the distance between the downhole water and the concentrate water is far, the sedimentation characteristics of the two types of water are also quite different, so separate treatment is adopted.
Eight, the impact of wastewater reuse on production indicators
After the completion of the wastewater reuse facility, the schematic diagram of the ore dressing water in Hedong Gold Mine is shown in Figure 14. All directly reused and settled wastewater is sent to the high water tank and flows through the pipeline to each water.
Figure 14 Schematic diagram of production water after reuse of Hedong Gold Mine wastewater
The wastewater reuse facility was implemented in August 2004 and put into operation in October. In order to investigate the impact of wastewater reuse on mineral processing production indicators, the production indicators before and after wastewater reuse were counted.
For comparison, the average values ​​of the indicators before and after the reuse of wastewater are listed in Table 5. It can be seen from the above that due to the difference in the average grade of raw ore before and after the reuse of wastewater, it brings certain difficulties to the comparison of indicators. The average grade of ore processed by the ore dressing plant before the reuse of wastewater was 2.59g/t, and the corresponding concentrate gold grade was 85.12g/t, the recovery rate was 94.06%, and the corresponding dosage was also high. After the reuse of wastewater, the average grade of ore processed by the ore dressing plant was 2.31g/t, the corresponding gold grade of concentrate was 78.13g/t, the recovery rate was 94.44%, and the corresponding dosage was also low. However, the overall difference is not large, especially the difference in the recovery rate of concentrates is small. At least it can be said that wastewater reuse has no major impact on the beneficiation production process. Since some components in the wastewater may accumulate during the reuse process, it takes a long time to determine the impact and extent.
Table 5 Comparison of production indicators before and after wastewater reuse
produce Water | Production index | Dosage dosage / (g·t -1 ) | ||||
Raw ore grade / (g·t -1 ) | Concentrate grade / (g·t -1 ) | Recovery rate/% | Collector | Pine oil | CuSO 4 | |
Before reuse After reuse | 2.59 2.31 | 85.12 78.13 | 94.06 94.44 | 124.18 113.52 | 7.42 5.74 | 32.24 30.79 |
9. Economic benefits of wastewater reuse
Before the reuse of wastewater, most of the water used in Hedong Gold Mine should be taken from the Dujia water source of 15km. Because of the long distance, two-stage transportation is needed. According to the statistics of the past three years, the annual water withdrawal cost is more than 3.4 million yuan. After the completion of the project, it is basically possible to stop taking water from the Dujia water source. The annual economic benefit will be more than 3.4 million yuan, because the investment in wastewater reuse project is only about 100,000 yuan, and there is basically no need to increase personnel. The facilities are only two sedimentation tanks, and the annual operating cost is very low, so it is conservatively estimated that the economic benefit is at least 3 million yuan. At the same time, it resolves the contradiction between the dry season and agricultural water, ensures the normal production, and solves the pollution problem caused by tailings water discharge. It is a project with both economic and social benefits.
Ten, conclusion
(1) Investigating the wastewater of Hedong Gold Mine and identifying the amount of wastewater, laying a foundation for the utilization of wastewater.
(2) The water quality of six kinds of wastewater in Hedong Gold Mine was analyzed. It is found that the composition of different wastewaters is different, all wastewaters are weakly alkaline, the conductivity of various waters is relatively high, and the difference between water quality is relatively small. The ions in various waters are mainly calcium, magnesium ions and sulfate and bicarbonate anions, and the content of other metal ions is not high. The most significant difference in content is the turbidity and suspended solids content of the wastewater, with both being the highest in concentrate water, followed by downhole water and integrated water.
(3) The flotation test shows that the tailings water, the reservoir water and the water in the 953 mining area have little effect on the flotation process and can be directly reused. Concentrate water, downhole water and integrated water have a negative impact on the flotation process, mainly because the grade and recovery rate of the concentrate are reduced when the amount of collector is low. The reason for the impact is that the fine particulate suspension contained in the wastewater consumes the flotation agent.
(iv) The majority of suspended solids in concentrate water, downhole water and integrated water can be removed by gravity sedimentation. The water after sedimentation has no effect on flotation, indicating that the three wastewaters that have an impact on flotation can be reused after gravity sedimentation, and the required treatment method is relatively simple.
(5) The sedimentation tank for the treatment of underground water and concentrate water sedimentation was designed, and the main dimensions and main drawings of each part of the sedimentation tank were determined.
(6) The theoretical reuse rate of treated wastewater can reach 98.96%.
(VII) Comparison of one month's production index before and after wastewater reuse shows that wastewater reuse has no major impact on the beneficiation process, because the statistics of production indicators are only one month, and some components in the wastewater may gradually accumulate, so it still needs Continue to pay attention to the production process and conduct long-term statistics to ensure that wastewater reuse has an impact.
(8) The economic benefit of the reuse of wastewater from Hedong Gold Mine is at least 3 million yuan. At the same time, it can basically no longer discharge wastewater. Therefore, it is a project with both economic benefits and environmental benefits.
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