A kind of comprehensive recovery processing method of cobalt sulfur concentrate

Abstract

The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for comprehensive recovery and treatment of cobalt-sulfur concentrate. It undergoes oxidation boiling roasting of cobalt sulfur concentrate to obtain calcined sand and SO 2 Flue gas, SO 2 After the flue gas is purified and dedusted, it enters the flue gas acid system to make acid; after the calcined sand is cooled, it is ball milled to obtain fine particles, which are subjected to slurry pre-leaching, continuous pressure leaching system for continuous selective leaching, and lime milk pulp for pre-neutralization , to obtain the supernatant and filter residue, the supernatant is treated and entered into the copper extraction system for extraction, and the cathode copper, the liquid after electrowinning and the raffinate are obtained; the washing liquid is obtained after the filter residue is washed, and the liquid after electrowinning and the washing liquid are used as Slurry liquid performs slurry pre-soaking treatment on calcined sand, and raffinate enters cobalt precipitation process and magnesium precipitation process to obtain cobalt and magnesium solids, which are sent to the slag yard for storage. The method can effectively recover cobalt and copper in the ore at one time, and the recovery rate of cobalt and copper is high, can effectively process low-grade cobalt-sulfur concentrate, and realize the maximum utilization of resources.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method for comprehensive recovery and treatment of cobalt-sulfur concentrate. Background technique [0002] At present, the processing technology of cobalt-sulfur concentrate at home and abroad can be divided into the following categories: 1) Pyromelting: cobalt-sulfur concentrate is treated by pyrolysis, and pyrotechnics such as oxygen-enriched blowing, continuous blowing, and anode furnace refining are used. The copper cobalt sulfide in cobalt sulfur concentrate is first converted into copper matte, then refined into blister copper, cast into anode plate, and then electrolytic refining is used to recover copper and cobalt. This process is simple, the raw material adaptability is strong, and the processing capacity is large, but For low-grade cobalt-sulfur concentrates, there is a problem of low grade, and the cobalt recovery rate in this process is low, and the ...

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Problems solved by technology

The copper cobalt sulfide in cobalt sulfur concentrate is first converted into copper matte, then refined into blister copper, cast into anode plate, and then electrolytic refining is used to recover copper and cobalt. This process is simple, the raw material adaptability is strong, and the processing capacity is large, but For low-grade cobalt-sulfur concentrates, there is a problem of low grade, and the cobalt recovery rate in this process is low, and the market price of cobalt is high, so the pyrolysis treatment outweighs the benefits; 2) Sulfation roasting: Sulfation roasting has low sintering temperature and can With the characteristics of less consumption, it can directly convert the cobalt copper sulfide in the ore into soluble cobalt copper sulfate, and the latter can directly separate the valuable metal from the ore by means of water leaching, so this process can greatly shorten the cobalt sulfur Concentrate comprehensive recovery treatment process, but the sulfuration roasting process also has the problem of low cobalt recovery rate, only about 75%, at the same time, the processing capacity is low, the roasting process control requirements are high, and the roasting temperature is high, part of the cobalt, copper and iron will form insoluble Ferrite reduces the leaching rate, low roasting temperature leads to incomplete conversion of cobalt-copper sulfide, and high iron leaching rate, resulting in high cost of iron removal, large amount of slag, and large entrainment loss of cobalt and copper; 3) bioleaching: bioleaching is An emerging metallurgical technology, mainly using bioleaching-extraction-washing-stripping process

Bioleaching has low energy consumption and has good adaptability to low-grade ore with complex components, but the iron leaching rate is high, the post-treatment cost is high, and the bioleaching treatment capacity is small, so it is not suitable for large-scale application

[0003] In the prior art, it is difficult to systematically recover cobalt-sulfur concentrate, whether it is pyromelting, sulfated roasting or bioleaching, especially for cobalt with high market price, there is a problem of low recovery rate

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