Resource utilization method of wastewater slag of cobalt and nickel metallurgy

Abstract

The invention discloses a resource utilization method of the wastewater slag of cobalt and nickel metallurgy. The method comprises the following steps of levigating a material through ball milling, then sieving, then reducing through high-pressure hydrogen to reduce nickel, cobalt, copper and the like therein into metal elements, wherein calcium, magnesium, manganese and the like are not reduced,then sorting through gravity to separating the metal elements such as nickel, cobalt and copper from other sizing agents to realize the separation of nickel, cobalt, copper and iron from other metals,then adopting magnetic separation to separate nickel, cobalt and iron from copper, smelting copper powder, then electrorefining to obtain cathode copper, then adding nickel, cobalt and iron powder inphosphoric acid to dissolve, adding hydrogen peroxide to obtain an iron phosphate precipitate, wherein nickel and cobalt are not oxidized so that the precipitation of nickel, cobalt and iron is realized, then extracting, performing reverse extraction by stages after extracting nickel and cobalt to realize the separation of nickel and cobalt, and enabling raffinate to be subjected to concentrationand crystallization to obtain an ammonium phosphate compound fertilizer. The method can be used for realizing the separation and recovery of all ingredients, the recovery rate is high, the finally obtained product has high purity, and the added value of the product is high.

Description

technical field [0001] The invention relates to a resource utilization method of cobalt-nickel metallurgy waste water slag, belonging to the technical field of waste treatment. Background technique [0002] As a strategic resource, the status of cobalt and nickel in the industry has been greatly improved. It is widely used in cemented carbide, functional ceramics, catalysts, military industry, and high-energy batteries. It is known as industrial monosodium glutamate. [0003] Especially with the development of new energy vehicles, lithium batteries based on ternary materials have developed rapidly. The annual demand for nickel-cobalt lithium manganese oxide has reached hundreds of thousands of tons, and the demand for nickel-cobalt metal has also reached tens of thousands of tons. [0004] The production of cobalt and nickel is mainly based on hydrometallurgy. [0005] In cobalt-nickel hydrometallurgy, every ton of cobalt-nickel produces 40-60 tons of waste water in the sme...

AI Technical Summary

Problems solved by technology

[0007] Because there are many types of metals contained in it, and the content of each component is almost the same, it is difficult to recycle them all by conventional treatment processes. Generally, acid is dissolved and then sulfide is used to precipitate zinc, cobalt, nickel, copper, and others. The elements re-enter the wastewater, and then be precipitated again, and then enter the wastewater slag, resulting in the gradual enrichment of magnesium, calcium, manganese and other elements in the wastewater, and the full utilization of various valuable metals cannot be realized, which is not in line with the current environmental requirements

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