Method for treating high-sulfur materials through continuous pressure oxygen leaching

Abstract

The invention discloses a method for treating high-sulfur materials through continuous pressure oxygen leaching. The method comprises the steps of material preparation, liquid preparation through pressure oxygen leaching, flash evaporation, liquid-solid separation, washing, heat exchange and the like; the reaction temperature is kept through heat release in the oxidation process of low-valence sulfur in the materials, steam consumption and additive consumption are avoided, redundant heat in the reaction process is consumed by introducing cooling media, the reaction temperature rise is effectively controlled, and reaction heat energy is sufficiently and comprehensively utilized through heat exchange. According to the method, continuous pressure leaching is conducted in one stage, flash evaporation, continuous cooling and pressure reduction are conducted in another stage, leaching residues do not need to be treated to recycle sulfur, the whole production process is continuous, the automatic control degree is high, self-heating is achieved in the reaction process, the reaction temperature does not need to be kept by adding elemental sulfur or steam, the leaching time is short, the metal yield is high, the production energy consumption is low, and the continuity, the stability and the safety of production operation are higher.

Description

technical field [0001] The invention relates to a pressurized oxygen immersion smelting process, in particular to a method for continuous pressurized oxygen immersion treatment of high-sulfur materials. Background technique [0002] China is a country that lacks cobalt and nickel resources. It imports a large amount of them every year to meet production needs. With the depletion of resources, cobalt and nickel raw materials are mainly sourced from primary ore and secondary ore flotation high-sulfur concentrate. The composition of this kind of raw material is relatively complex, usually the material contains low-valent sulfur between 4-35%, and contains at least one of cobalt, nickel, and copper. Conventional pyrometallurgy or pyrohydrometallurgy combined with smelting produces a large amount of sulfur dioxide gas, causing environmental pollution, and the metal yield is low; if atmospheric pressure hydrometallurgy is used, there will be a large amount of oxidant, high cost, l...

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Problems solved by technology

In recent years, the pressurized oxygen leaching full-wet process for treating concentrates has also appeared in China. In the Chinese patent of publication number CN1352308A "A method for extracting nickel from nickel sulfide materials with low copper content", nickel concentrates and copper-containing materials are treated. Low nickel matte, a certain amount of sulfur can be added in the pressure leaching process to maintain the heat of reaction, and the copper is not leached. Therefore, the copper in the slag needs other processes to recover copper; the Chinese patent of publication number CN1786225A "A kind of iron-containing nickel sulfide In the wet processing method of materials", the iron-containing nickel sulfide material produced by chemical precipitation is treated, and the method is added with additives to reduce the influence of elemental sulfur; in the Chinese patent "a method for leaching Cuban nickel and cobalt raw materials" with publication number CN103725899A , provides a method for processing Cuban nickel-cobalt raw materials, the leaching temperature is 130-160°C, the pressurized oxygen leaching pressure is 0.3-0.8MPa, the leaching time is 2-4h, the leaching time is relatively long, and the process parameters in the patent are not suitable Process high-sulfur concentrates; in the Chinese patent "hydrometallurgical process for extracting copper from sulfide concentrates" with publication number CN1187221A, a kind of oxidation pressure leaching treatment of chalcopyrite with carbon material additives is provided. This process uses additives to Eliminate the influence of elemental sulfur on leaching, the leaching slag contains a lot of sulfur, and the subsequent treatment of slag is also a big problem

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