Process method for alkaline wet process leaching of copper from matte slag

Abstract

The invention relates to a process method for alkaline wet process leaching of copper from matte slag, and belongs to the technical field of copper recovery. The problems of difficulty and high cost and the like in recovering the copper from the matte slag are solved. In the process method, the content of the copper in the matte slag is between 0.2-5wt%. The process method for alkaline wet processleaching of the copper from the matte slag includes the following steps that step 1, the matte slag is ground and sieved to obtain matte slag to be treated; step 2, the matte slag to be treated is oxidized and roasted to obtain roasting slag; step 3, a glycine leaching agent is configured, and the pH of the leaching agent is adjusted with an alkaline solution; step 4, leaching process is carriedout, specifically, the roasting slag is mixed with the glycine leaching agent for copper leaching; step 5, copper sinking process is carried out, specifically, the glycine solution containing the copper and an oxalic acid solution are mixed for copper sinking, and copper oxalate precipitation and a glycine solution are obtained by filtration; and step 6, roasting decomposition is carried out, specifically, the copper oxalate precipitation is washed and put into a high temperature roasting furnace, and is subjected to thermal decomposition under the protection of argon to obtain copper powder.The process method for alkaline wet process leaching of the copper from the matte slag can realize high efficiency leaching and recovery of the copper in the matte slag.

Description

technical field [0001] The invention belongs to the technical field of copper recovery, in particular to a process for leaching copper from matte slag by an alkaline wet method. Background technique [0002] At present, pyrometallurgy is the main process for producing copper, and its refined copper production accounts for about 80% of the world's copper production. Using this method to smelt copper, every ton of refined copper produced will produce about 2.2 tons of copper slag, and the amount of copper slag produced in my country is as high as 15 million tons every year. Matte slag is the metallurgical slag in the smelting process of pyrometallurgy to make matte. As a typical secondary resource, the grade of copper is mostly higher than 0.5%, which is much higher than the grade of copper mining in my country (0.3%). Development potential and recycling value. [0003] The recycling technology of copper in copper slag mainly includes chemical leaching and mineral processing....

AI Technical Summary

Problems solved by technology

Chemical leaching methods include sulfate leaching, ammonia leaching and microbial leaching, etc.; sulfate leaching uses sulfuric acid to directly leach copper in copper slag, but during the leaching process, fayalite and quartz phases in copper slag are leached. The large consumption of sulfuric acid, on the one hand, the leaching of iron and other elements also cause the subsequent purification of the leaching solution and the difficulty of copper enrichment; the ammonia leaching method uses the complexation of ammonia and copper, but due to the high volatility of ammonia, a closed leaching environment is required In addition, elements such as Zn, Cd, and Ni in copper slag can be leached, and the leaching conditions and the subsequent separation process of each element need to be reasonably controlled; microbial leaching is generally used in the leaching of low-grade refractory sulfide ores and oxide ores. It can be used to extract copper from copper slag, but at present its disadvantages are slow microbial leaching speed, long production cycle, and the cultivation of microbial strains is also the main problem that limits its application

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