Method for separating antimony and iron by extraction-water decomposition in a mixed solution of antimony and iron

Abstract

The invention discloses a method for extracting-water-splitting and separating antimony and iron in an antimony-iron mixed solution, belonging to the field of non-ferrous metal metallurgy. The method firstly uses iron powder to reduce high-valent antimony iron ions in an antimony-iron mixed solution to a low-valent iron Divalent iron ion and trivalent antimony ion are filtered and separated to obtain low-valent antimony iron solution, and then use quaternary ammonium salt extractant to extract and separate antimony from it, to obtain antimony-rich organic phase and ferrous raffinate, the latter can be directly opened; The antimony-rich organic phase does not carry out back extraction, but is directly water-decomposed to generate antimony oxychloride, and at the same time, the quaternary ammonium salt extractant is regenerated. The method realizes the separation problem of antimony and iron through valence adjustment and extraction process, and the separation of antimony and iron is complete; and the innovative water splitting step is used to directly complete the dissociation of antimony, which cancels the traditional stripping process and obtains antimony products in one step. and regeneration extraction agent, simplifying the process, reducing the consumption of reagents, and solving the problem of separation and separate utilization of antimony iron solution in the antimony hydrometallurgy process.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and more specifically relates to a method for separating antimony and iron by extraction-water decomposition in a mixed solution of antimony and iron. Background technique [0002] Antimony is widely used in the fields of metallurgy, materials, chemicals, and building materials. my country is the world's largest antimony resource country, accounting for more than 80% of global reserves. The smelting of antimony is mainly based on sulfide ore, mainly including pyrotechnics and wet processes. The pyrotechnic process mainly adopts blast furnace volatilization roasting (smelting)-reduction smelting process, and there is a low concentration of SO 2 With the disadvantages of flue gas pollution, high energy consumption and large amount of smoke and dust, with the increasing environmental protection requirements, this process has not adapted to the development requirements. [0003] Since the ...

AI Technical Summary

Problems solved by technology

Patent CN107557579A discloses a method for extracting and separating antimony-iron in an acidic complex antimony-containing solution, which is still a traditional extraction process in essence, and the extraction selectivity is not good under multivalent conditions

In the process of research on the separation process of antimony and iron, Zhang Yinsheng, Wang Chengyan, etc. proposed to use P204 as the extraction agent to extract iron from antimony and iron solution in the paper "P204 Extraction and Separation of Antimony and Iron" published in Nonferrous Metals (Smelting Part). , leaving antimony in the original solution, due to the complex valence state in the solution and the poor selectivity of P204, the extraction rate of iron is only 30% to 50%, while the extraction rate of antimony is as high as about 20%, so the separation of antimony and iron is not complete

[0005] Other replacement methods and evaporation methods have not solved the separation problem of antimony and iron in the mixed high acid solution of antimony and iron

Images