Copper smelting slag compared with mineral natural ore, slag dressing a multi-step slow cooling, which is the difference between the maximum and the nature of the slag Ore Beneficiation, steelmaking slag is actually an artificial ore, copper ore such particles The phase composition depends on the slag cooling mode and the cooling rate. There are three cooling methods for the slag: natural cooling, water quenching, heat preservation cooling and water quenching. The thermal insulation cooling + water quenching is beneficial to the flotation recovery of copper. The crystal grain size of the copper mineral in the slag is closely related to the cooling rate of the slag. The slow cooling of the slag is beneficial to the migration and accumulation of the copper phase particles. That is, during the slow cooling process of the slag, the initial crystallite of the slag solution can be dissolved. The precipitate forms a growth, forming a well-crystallized self-shaped or semi-automorphic crystal, and the useful mineral thus diffuses, migrates, aggregates and grows into a relatively concentrated independent phase, making it easy for monomer dissociation and sorting.

At present, China's copper smelting slag has an annual output of 11 million tons and copper content of 275,000 tons, which is an important part of secondary copper resources. The treatment methods of copper smelting furnace slag mainly include depletion by fire method, wet leaching and enrichment of ore dressing. The waste slag depleted by fire method has high copper content, high energy consumption and serious environmental pollution. Although the slag slowing cold slag covers a large area, the capital investment is higher, but the copper recovery rate is higher. The beneficiation tailings contain copper. controlled within 0.3%, and the higher the slag in the recovery of silver and gold, low energy consumption, low cost, and thus is widely used. Domestic enterprises that use ore dressing to process copper smelting slag mainly include Baiyin Nonferrous Metals Group, Jiangxi Copper Group, Tongling Nonferrous Metals Group, Daye Nonferrous Metals Group and Xiangguang Copper Group.

Jiangxi Copper Guixi Smelter and Shandong Yanggu Xiangguang Copper Smelter have successfully applied “copper smelting slag slow cooling – semi-self-grinding + ball milling – copper mineral flotation.” The new process effectively solved the copper smelting slag. The excessively fine particle size of copper crystals makes it difficult to dissociate the monomers, and the conventional crushing causes a series of technical problems such as the production capacity and low operating rate of the medium and fine crushing equipment caused by the entrained ice copper in the smelting slag, and realizes the effective recovery of copper in the steel smelting slag. The 3-year application data shows that for copper smelting slag containing about 2.7% copper, the copper concentrate grade obtained is greater than 26%, and the tail slag grade contains less than 0.3% copper.

The silver slag stored in the silver-colored group fishery farm is about 7 million tons, and about 30,000 tons of new silver slag is still produced in the following year. Due to the difference between the silver furnace and other copper smelting processes, the particularity of the properties of silver slag is determined, and the beneficiation process and technical indicators are also different. In order to realize the comprehensive utilization of the secondary resources, the Baiyin Nonferrous Metals Group 140 × 10 4 t/a slag beneficiation system was put into operation in May 2012, and reached the standard at the end of 2012. The project adopted “copper smelting slag package slow cooling— Coarse crushing + semi-self-grinding + ball milling - copper flash flotation - medium mines return to re-grind." After the new process replaces the lean electric furnace process in the smelting process, the annual SO2 emission during the smelting process can be reduced by 270 tons, the slag tail copper content is reduced to 0.28%, and the annual recovery of copper metal is 22,000 tons.

Liu Chunlong carried out the slag beneficiation test research on the problem of high copper tailings grade after a copper smelting slag beneficiation. The middle mine was re-grinded and re-elected to return to the second-stage ball mill grading and re-grinding, optimizing the pharmaceutical system and ensuring the key The amount of the flotation agent is used to enhance the collection of coarse and medium-sized minerals. When the slag contains 2.9% copper, the copper concentrate obtained contains 26.20% copper, the copper recovery rate is 92.26%, and the copper grade of the copper slag beneficiation tailings is reduced to 0.25%. Wang Guohong proposed a number of measures to solve the "slag-packing gun" and "turning out the red envelope" for the slow-cooling process of copper smelting furnace slag in Guixi Smelter, pointing out the service life of the slag package, timely renewing the slag package, and ensuring the use of the slag package. Ways to safety and reduce production costs.

A copper smelting slag Yunnan 0.62% copper, 35.58% iron containing mainly copper minerals chalcopyrite, chalcocite and azurite, copper minerals and gangue minerals mainly disseminated olivine complex relationship, the insert The cloth size is subtle. Wang Zuxu et al. studied the "carrier flotation" under the condition of fine grinding and using matte as the "carrier". The obtained copper concentrate contained 21.30% copper and copper recovery rate of 86.20%.

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