Anode mud treatment method of preparing metallic nickel by copper sulphide

Abstract

The invention discloses an anode mud treatment method, which comprises the following steps: stirring anode mud slurry in an air flotation slot; enabling the anode mud slurry to stay in the air flotation slot for preset time after stirring is stopped so as to settle and separate the anode mud slurry into three layers, wherein the top layer is crude sulfur, the middle layer is the aqueous solution of sulfate, and the bottom layer is a sulfide containing valuable metals; discharging the sulfide, the aqueous solution and the crude sulfur in sequence from the bottom of the air flotation slot; drying and then melting the crude sulfur; and carrying out pressure filtration on the melted crude sulfur to separate the sulfide containing the valuable metals to obtain pure sulfur. According to the anode mud treatment method, three substances in anode mud are simultaneously separated in the same air flotation slot, less equipment is needed, and the separation effect is good. The sulfur content in the separated crude sulfur is high, and the energy consumption in melting is further reduced because the crude sulfur is dehydrated and dried before being melted. Since the sulfur content in the crude sulfur is high, and the sulfide content is low, the operation and the efficiency performance of a sulfur filter press become convenient.

Description

technical field [0001] The invention relates to a method for treating anode slime, in particular to a method for recovering sulfur and sulfides rich in valuable metals from anode slime, a by-product of electrolytic production of nickel metal. Background technique [0002] Traditionally, the production of metallic nickel from copper-nickel sulfide ore has to go through many processes to separate the impurities in the nickel mineral from other metals and obtain pure metallic nickel. The last process is the electrolysis process of nickel, in which metallic nickel is precipitated at the cathode , while the sulfur contained in the anode and other valuable metals (such as platinum, lead, gold, silver,) rich in sulfides (such as nickel sulfide and copper sulfide) remain in the electrolytic cell in the form of solid mud, Commonly known as anode slime. Anode slime contains a large amount of sulfur and insoluble valuable metals as well as worthless impurities. [0003] In order to ...

AI Technical Summary

Problems solved by technology

Sulfur, sulfide and other substances are not pre-separated, resulting in low sulfur content of anode slime entering the dryer and melting tank, large material handling capacity, and thus high energy consumption

At the same time, crude sulfur is melted using normal pressure suction filtration, the recovery rate of sulfur is low, and the working conditions are poor.

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