Manufacture of copper arsenite and application of the same

Abstract

A method for preparing the cupric arsenite is provided. Water is firstly added in the reactor, and sodium hydroxide or potassium hydroxide lye is added in accordance with the 0.5mol / L to 5mol / L quantity volume concentration of matters and is stirred to dissolve. The arsenic trioxide is added in accordance with the mol ratio of 3 : 2 to 3 : 1 between the hydroxyl and the arsenic of the arsenic-alkali and the pH value of the solution is adjusted to 6.0 to 10.. Under 0 DEG C. to 40 DEG C., the copper sulfate solid is added in accordance with the mol ratio of 1 : 1 to 2 : 1 between the copper and the arsenic. The caustic lye is added and the pH value of the solution is adjusted to 6.0 to 10. reversely. The cupric arsenite is gained after filtering and washing and is repeatedly washed by clear water and is added in the copper electrolyte or the decoppering final solution; the sedimentation containing As, Sb and Bi produced after reaction is filtered and removed and the removal rate of the Sb and Bi impurities in the copper electrolyte highly reaches 50 per cent to 70 per cent. The cupric arsenite added in the copper electrolyte is characterized by strong purification capacity, simple process and low cost.

Description

technical field [0001] The technical invention relates to the preparation of copper arsenite and the application of copper arsenite in the purification of copper electrolyte. Background technique [0002] Arsenic and arsenic compounds are toxic, but they are also important industrial raw materials. How to deal with and utilize arsenic and its compounds has always been a difficult problem for smelters at home and abroad. [0003] In the 18th century, the Swedish chemist Scheler first discovered copper arsenite and named it Scheler Green, which was used as a green pigment. In the middle of the 19th century, a pesticide with copper arsenite as the main component began to be used and became the first registered pesticide in the world. [0004] The traditional copper electrolyte purification method is electrowinning copper removal and arsenic removal. In recent years, researchers around the world have made some improvements on this basis, such as continuous decopper and arseni...

AI Technical Summary

Problems solved by technology

Although electrodeposition copper removal and arsenic removal have made great progress, there are still the following disadvantages: 1) using insoluble anode electrolysis, low current efficiency and high energy consumption; 2) when the concentration of copper ions in the solution is reduced to a certain value, the cathode It will precipitate highly toxic arsine gas; 3) black copper with high content of arsenic, antimony, and bismuth circulates in the smelting and electrolytic refining system, and the arsenic, antimony, and bismuth cannot be completely opened in the form of products; 4) copper ions in the electrolyte Depletion, high acid content, it is difficult to achieve copper and acid balance even through reverse dissolution of copper sulfate

Although these methods have solved part of the problem of copper electrolyte purification, there are still some problems, such as 1) some extractants have high solubility in water, and the loss in the extraction process is relatively large; 2) the exchange capacity of the resin is limited, and usually requires 4-6mol / L hydrochloric acid elution, there are chloride ion contaminated electrolyte and acid wastewater treatment is difficult; 3) The follow-up process of chemical precipitation method is long and the treatment cost is high

In addition, the above methods also have some common weaknesses, such as the need for additional equipment, cumbersome processing techniques, and high processing costs.

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