Takahashi Lead zinc ore is China Nonferrous Metal Industry Corporation to support local small business colored mine by expansion, with a current capacity of the former lead and zinc ore mining was 200t, is a mesothermal filling sulfide deposits, now The main metals such as lead and zinc are recovered, and the annual output of tailings is about 60,000 tons. The content of barite in the tailings was 7.4%, and the basic monomer was dissociated. The plant adopts heavy and floating processes to re-select the tailings and recover the barite. At the same time, lead and zinc are also obviously enriched in the barite concentrate. Therefore, through secondary recovery, the purpose of comprehensive utilization of resources is achieved.
The production process for recycling barite is shown in Figure 1. By re-selecting the Gaoqiao lead-zinc mine, the barite concentrate can be obtained from the tailings sand by about 3000t per year, the annual profit is about 300,000 yuan, and the recovered barite concentrate contains 97.8% BaSO 4 , which is in line with the rubber filler class II product. Claim. At present, barite is mainly used as a mud weighting agent for oil drilling. It can also be used as a raw material for zinc bismuth in rubber and paint, as well as raw materials for the production of metal bismuth and various strontium salts. The production and sales prospects are optimistic.
Figure 1 Barite recycling production process
The Chaihe lead-zinc mine has stored millions of tons of tailings. The mine first re-selected the tailings with a screw-slot chute, and then heavy sand was used for flotation treatment to obtain qualified zinc, lead and sulfur concentrates. Silver is recycled comprehensively. According to the annual treatment of 850,000 tons of tailings, the flotation of re-election concentrate is 150,000 tons, and the annual recovery of lead concentrate is 46% of lead concentrate 1890t, sulfur-containing 35% sulfur concentrate 10542t, zinc containing 45% The zinc sulfide concentrate is 5,840 tons, and the zinc oxide concentrate containing 35% zinc is 18,991 tons. In addition, lead concentrate contains 3212kg of silver. The total output value is 12.27 million yuan (excluding the value of sulfur concentrate), and the profit is 3.3 million yuan.
In foreign countries, the zinc flotation tailings of the Belousov lead-zinc plant in Russia contain zinc, lead, copper , iron sulfides and barites, which are re-selected by flotation to produce sulfides containing copper, zinc and lead. Mixed concentrate; pyrite concentrate containing 39% to 40% of iron, recovery rate of 87.8%, and barite concentrate containing BaSO 4 88% to 90% and recovery rate of 48.2% to 61.6%.
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