Recycling method for zinc smelting nickel and cobalt slag

Abstract

Provided is a recycling method for zinc smelting nickel and cobalt slag. The method comprises the steps that nickel and cobalt slag which is produced through three-section reverse antimony and two-section purification production is added to be subjected to one-section purification after being pulpified; copper and cadmium are removed in one-section purification by zinc powder remaining in the nickel and cobalt slag, copper cadmium cobalt slag is formed by the used slag, and then nickel and cobalt slag is not produced any more through purification. The copper cadmium cobalt slag is recycled by cadmium and is leached to separate copper and cadmium, the content of cobalt in the solution is 150-1000 mg / l, and the solution is returned back to a main system after the cobalt is recycled by an organic reagent. According to the recycling method, consumption of purification zinc powder is lowered by fully utilizing zinc powder remaining in the nickel and cobalt slag; a new way is developed for recycling of dangerous solid waste, like the nickel and cobalt slag, produced in wet zinc smelting; the technological process of cadmium recycling production is simplified, production operation is simple, and no precedent reports exist at home and abroad.

Description

technical field [0001] The invention belongs to the zinc hydrometallurgy industry, and opens up a new approach for the recycling of nickel-cobalt slag, a dangerous solid waste produced in the zinc hydrometallurgy industry. The method can make full use of the residual zinc powder in the nickel-cobalt slag. , to achieve the purpose of reducing the amount of zinc powder in the first stage of purification, and simplify the cadmium recovery production process, saving production costs. Background technique [0002] In the neutral leaching process of zinc hydrometallurgy, most of the impurity metals such as Fe, As, Sb, Ge can be removed from the solution through the process of neutralization and hydrolysis, but the impurities in the solution such as Cu, Cd, Co, Ni are in the It cannot be removed during the leaching stage. These impurities are more harmful to zinc electrowinning and must be purified before electrowinning. Most enterprises now generally adopt the three-stage (revers...

AI Technical Summary

Problems solved by technology

For the treatment of nickel and cobalt slag, many enterprises adopt self-built zinc sulfate production line or cobalt recovery production line to recycle and process, which not only has the problems of large one-time investment and high production cost, but also often makes it difficult to sell the products, and the gain outweighs the gain

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