Wushan Copper Mine copper ore belt in the north of high grade, accompanying elements, large reserves, is the rare high-grade ore. However, due to the complex nature of the ore, since the trial production in 1977, the selection index has been very unsatisfactory. In May 1981, Jiangxi Copper Industry Co., Ltd., together with Beijing Research Institute of Mining and Metallurgy, Nanchang Design Institute and Wushan Copper Mine, conducted a verification industrial test on the beneficiation process of the North Ore Belt. The results show that the original design process has not adapted to the changed ore properties. The ore dressing process in the North Mine Belt needs to be reformed. Comrade He Bangli of Wushan Copper Mine Research Institute believes that Wushan adopts the flotation-water and metallurgical combined process, which can not only comprehensively control the acidic wastewater of Wushan, but also greatly improve the recovery rate of ore dressing, and achieve significant economic benefits. Social benefits.
The ore in the northern ore belt has a high copper content and many associated elements (23.78% sulfur, 1.00 g/ton gold , 55.00 g/ton silver ). At the initial stage of production, the copper grade is as high as 4% or more, which is a rare rich mine in China. Complex ore mineral composition, the relationship between copper minerals disseminated pyrite and very close, mineral incrustation uneven granularity; dissemination characteristics to explain the structure of the main filling; mainly configured like a loose, punctiform; sulfur High; contains more mud; secondary copper sulfide content is high, brittle, brittle, easily oxidized into cholestasis and water green sputum, resulting in increasing water-soluble copper salt (the occupation rate of copper sulphate in the original ore is 10%) about).
The ore dressing crushing adopts three-stage closed circuit, and the coarse crushing is carried out for washing. Grinding and floating separation, the North two systems. The original design of the North Ore Belt adopts stage grinding and priority float copper process (see Figure 1 for the principle process). At present, the secondary ore belt of the North Ore Belt is treated by a small system in the South Ore Belt with a treatment capacity of 400 tons/day (see Principle 2 for the principle process).
figure 1 
figure 2 [next]
Technical Difficulties The Wushan Copper Mine is located in the middle and lower reaches of the Yangtze River. The temperature is high, the temperature is high, the rain is high, and the water content of the ore entering the plant is high. In the flotation operation, the slurry is pulverized with lime, and almost all of the copper ions become various types of refractory copper oxide. Due to the complex nature of the ore, the ore is difficult to implement, the existing process can not adapt to the ever-changing ore properties; the production index has been very unsatisfactory, the copper recovery rate is about 80%, and the tailings contain about 1% copper. According to the index calculation, the loss of copper metal every year after production will be equivalent to the loss of a small mine. It is worth noting that in recent years, due to the entry of wastewater into the Chihu water system, valuable fish such as carp and Wuchang fish have been damaged, and the farmland has been polluted to varying degrees. Therefore, comprehensive treatment and recycling of sewage is also necessary for Wushan to carry out the beneficiation process improvement. An important factor.
Study on the improvement of ore dressing process in the North Ore Belt. The microscopic identification of the copper tailings from the Wushan Copper Mine has shown that the copper lost in the tailings is mainly Cu(OH) 2 , Cu(OH)•CuCO 3 , and Raw copper sulfide and free copper oxide. In the current situation, it is difficult to recover this part of copper mineral by the general flotation method. After systematic research on the nature of ore and the current situation of Wushan, it is considered that the use of flotation-water treatment combined process, system arrangement for the improvement of Wushan mineral processing technology can achieve high economic benefits.
Improvement process If the copper part is basically maintained, it is proposed to split the copper tailings hydrocyclone, condense the overflow and then use sulfuric acid to leaching and grit sand re-election (Principle Flow Chart 3).
image 3
After the copper tailings are classified by the hydrocyclone, the copper minerals are relatively rich in the overflow, and the sulfur is relatively enriched in the grit. This provides an advantage for our different methods of metal recovery.
The cyclone overflow acid immersion copper test results, when the acid consumption per ton of dry ore is 90 kg, the primary leaching rate reaches 70.48%, the leaching solution copper ion concentration is 4.39 g / liter, if considering the heating, the second leaching, the leaching The rate will increase further. The test procedure of grit floating copper is shown in Figure 4. The test results are 0.65% copper in the absence of sand, 29.08% in sulfur, 8.44% in crude concentrate, 5.12% in crude concentrate copper, 3.78% in sulfur grade, and 66.48% in copper recovery. The sulfur recovery rate is 10.99%.
Figure 4
Forecast of economic indicators: technical indicators are 4% of original ore copper grade, 15% of copper concentrate grade, and total copper recovery rate is 95% (including 80% of ore recovery of ore float copper, and 5% of cyclone overflow acid leaching) The floating copper portion of the grit is increased by 3.5%, and the ore dressing water is recovered by 6.5%. Economic Benefits: With the processing capacity of 1200 tons/day, the annual recycling of copper metal is 2,466.71 tons. After deducting the production cost, it can earn more than 6 million yuan per year.
First, the use of vacuum annealing furnace
This equipment is used for pre-vacuum nitrogen protection annealing heat treatment of carbon steel wire.
Second, the equipment composition
The well type resistance furnace mainly comprises: a furnace body, a furnace shell(tube), a furnace cover and a lifting mechanism, a furnace lining body, a heating element and a fixing device, and a furnace temperature control system.
Third, the main technical performance indicators (design parameters)
3.1, stainless steel inner tank size: diameter 1750mm X height 2100mm
3.2, rated heating power: 270KW
3.3, rated temperature: 800 ° C
3.4, heating mode: 3 zone control, power supply ~ 380V, frequency 50Hz, star-shaped connection
3.5, heating element: material is 0Cr25Al5 resistance band
3.6, temperature measurement point temperature control accuracy: ≤ ± 1 ° C
3.7, Work area temperature field uniformity: ≤ ± 10 ° C
3.8, furnace out-wall temperature rise: ≤ 40 ° C
3.9, lining form: refractory fiber
3.10. Seal between furnace cover and furnace body: labyrinth sand seal
3.11, furnace cover opening mode: electric lifting
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