Combined leaching process of cobalt-sulfur concentrate and cobalt hydroxide ore

Abstract

The invention discloses a combined leaching process of cobalt-sulfur concentrate and cobalt hydroxide ore. The process comprises the following steps that after the cobalt-sulfur concentrate and the cobalt hydroxide ore are pulped to obtain pulped liquid; reaction is carried out on on the pulped liquid under the pressure of 0.6 MPa to 1.25 MPa and the temperature of 150 DEG C to 180 DEG C, and solid-liquid separation is carried out to obtain a solid phase and a liquid phase; and the liquid phase is the leachate. According to the process, the cobalt-sulfur concentrate and the cobalt hydroxide ore are subjected to high-pressure combined leaching, high-valence cobalt is reduced into low-valence cobalt by the cobalt-sulfur concentrate, and in the high-pressure oxidation leaching process, sulfur ions are oxidized into sulfate radicals, and ferrous ions are oxidized into iron ions; meanwhile, in the environment, the iron ions are hydrolyzed to finally form ferric oxide (Fe<2>O<3>) and hydrogen ions, cobalt hydroxide is leached out by utilizing the generated hydrogen ions, and meanwhile cobalt, copper and nickel in the cobalt-sulfur concentrate are leached into the solution; and the process for utilizing the cobalt-sulfur concentrate is simplified, and the leaching efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a combined leaching process of cobalt sulfur concentrate and cobalt hydroxide ore. Background technique [0002] Cobalt is an indispensable strategic metal in high-tech industries, and plays an important role in high-temperature alloys, hard alloys, magnetic materials, chemical industry and electronic industry. [0003] Therefore, it is of great significance to further improve the utilization rate of existing cobalt minerals (cobalt-sulfur concentrate and cobalt hydroxide ore, etc.); the process of cobalt-sulfur concentrate leaching in related technologies is mainly leaching after direct sulfate roasting, oxidation roasting- Leaching after chlorination roasting and oxidation roasting-leaching after sulfuration roasting, sulfur dioxide flue gas produced by roasting to produce sulfuric acid, and metal elements such as copper, cobalt and nickel are recovered from the leaching...

AI Technical Summary

Problems solved by technology

The leaching process of the above-mentioned cobalt-sulfur concentrate is complicated, and the supporting investment is large; at the same time, the output of cobalt is small, the concentration of the solution after leaching is low, the treatment process is relatively large, and the efficiency of investment output is low

[0004] In the related technology, cobalt hydroxide ore is mainly obtained by reducing acid leaching and other mainstream processes to obtain cobalt-rich solution, but because sulfur dioxide and sodium metabisulfite are used as reducing agents to generate sulfur dioxide gas, the on-site operating environment is poor, and sulfur dioxide cannot be effectively absorbed and then enters the absorption tower. A large amount of liquid caustic soda, a large amount of Fe needs to be added after being reduced, resulting in high production costs

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