Method for preparing cobalt salt through low-cost resourceful treatment of cobalt intermediate products and waste battery materials

Abstract

The invention discloses a method for preparing cobalt salt through low-cost resourceful treatment of cobalt intermediate products and waste battery materials. The method comprises the following steps that S01, acid leaching treatment is carried out on crude cobalt intermediate products and cobalt-rich battery waste materials by adopting an acid leaching method to obtain a leaching solution a; S02, an alkali neutralizer is added into the leaching solution a, iron and aluminum in the leaching solution a are subjected to precipitation treatment, and after separation precipitation, a to-be-extracted solution is obtained; and S03, a P507 extraction solution obtained after saponification treatment is used for conducting two-stage extraction on the to-be-extracted solution, copper, manganese and iron are separated firstly, raffinate a is obtained, then the raffinate a obtained after extraction and impurity removal treatment is extracted again to separate cobalt, nickel and magnesium, raffinate b and a calcium-containing cobalt solution are obtained, the calcium-containing cobalt solution is deeply extracted through the P507 extraction solution, and a refined cobalt sulfate solution is obtained. The method is low in production cost, the product quality can meet the quality requirement of a battery-grade cobalt salt product, the defect that normal production cannot be achieved due to calcium sulfate scale formation in the extraction process is overcome, and near-zero discharge of waste water is achieved.

Description

technical field [0001] The invention belongs to the technical field of resource treatment of cobalt-containing waste materials, in particular to a method for producing cobalt salts from low-cost resource treatment of cobalt intermediate products and waste battery materials. Background technique [0002] The physical and chemical properties of cobalt determine that it is an important raw material for the production of heat-resistant alloys, hard alloys, anti-corrosion alloys, magnetic alloys and various cobalt salts; cobalt-based alloys or cobalt-containing alloy steels are often used as blades of gas turbines, Impellers, ducts, jet engines, rocket engines, missile components, various high-load heat-resistant components in chemical equipment, and important metal materials in the atomic energy industry. In powder metallurgy, cobalt as a binder in powder metallurgy can ensure that the cemented carbide has a certain toughness. Magnetic alloys are indispensable materials in the ...

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Problems solved by technology

[0004]As the application of cobalt becomes more and more extensive, it is more and more necessary to recycle cobalt intermediate products and cobalt-containing recovered products to produce cobalt salts. The extraction method is an important means for the purification of cobalt salts, and most of the intermediate products generated by traditional extraction methods have a low reuse rate, resulting in high overall costs, and the quality of the cobalt salt products obtained by extraction is difficult to meet the quality requirements of battery-grade cobalt salt products In addition, in the traditional cobalt salt extraction process, the normal production will not be possible due to the formation of calcium sulfate scale, and the wastewater discharge during the extraction process is more

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