Method for extracting valuable metal from copper nickel sulfide through ammonium persulfate-sulfuric acid oxidation leaching

Abstract

The invention discloses a method for extracting valuable metal from copper nickel sulfide through ammonium persulfate-sulfuric acid oxidation leaching. The method comprises the steps of screening low-grade copper nickel sulfide raw materials to obtain copper nickel sulfide mineral powder, according to the proportion, taking ammonium persulfate and sulfuric acid raw materials, adopting one (1) of the two manners in the ammonium persulfate to be completely mixed with sulfuric acid to form a mixture, and then uniformly mixing the mixture with mineral powder according to the proportion; and secondly, enabling the ammonium persulfate to be partly mixed with the sulfuric acid, partly making a saturated solution, under the specific temperature and system pH, performing a constant-temperature leaching reaction, in the leaching process, adding a saturated ammonium persulfate solution, finishing leaching and filtering, and obtaining leaching liquid, wherein the extraction rate of valuable metalNi in the leaching liquid is 90.4 to 97.5%, the extraction rate of Cu is 93.4 to 99.9%, and the extraction rate of Co is 92.7 to 99.6%. The method is low in leaching temperature, low in sulfuric acidconcentration, small in use amount, simple in process flow, and wide in application range, ore raw materials are limited by areas, ore, grade and the like, the extraction rate of the valuable metal ishigher, and no SO2 is emitted.

Description

Technical field: [0001] The invention belongs to the technical field of non-ferrous metal metallurgy, and in particular relates to a copper-nickel sulfide ammonium persulfate-sulfuric acid oxidation leaching method for extracting valuable metals. Background technique: [0002] Nickel is an important strategic metal, mainly distributed in sulfide nickel ore and oxidized nickel ore resources. Among them, sulfide-type nickel ore is the main resource for nickel production because of its good quality and mature smelting technology. In recent years, with the increasing demand for nickel in the world, the exploitable high-grade nickel sulfide ore resources are increasingly exhausted, and low-grade copper-nickel sulfide nickel ore has become the key development target of the nickel industry. [0003] Low-grade copper-nickel sulfide ore is a thick mixed ore zone between the primary sulfide ore lean body and the upper oxidation zone, accompanied by a large amount of copper and cobalt...

AI Technical Summary

Problems solved by technology

In order to improve the leaching rate of copper, Fan Xingxiang et al. studied the process of leaching chalcopyrite with silver ion catalysis and ammonium persulfate, and reacted the ore powder with a particle size of -74+58 μm at 95°C for 100 minutes, and the leaching rate of copper could reach 98%. % or more, but the addition of silver ions not only increases the cost, but also causes the decomposition of ammonium persulfate to produce N 2 and SO 2 , increase recycling costs and pollute the environment

In addition, these studies are all aimed at the study of single mineral phase minerals with extremely fine grain size, while the processing research on low-grade copper-nickel sulfide minerals with complex mineral phase composition and multi-metal coexistence has not been reported, so the oxidation of this type of minerals It is of great significance to study the efficient extraction of valuable metals by leaching

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