A method for selectively removing iron from an antimony electrolyte and preparing ferrous oxalate

Abstract

The invention provides a selective iron removal and ferrous oxalate preparation method through an antimony electrolyte. According to the method, under the condition that the acidity is not adjusted, iron ions and antimony ions in the electrolyte are compounded through a compounding agent, then a reducing agent is added to conduct selective reduction on iron ion compounds, solid-liquid separation is conducted on the reduced electrolyte so that iron-containing compounds and the excessive compounding agent can be separated out, and finally, a precipitating agent is added to separate the compounding agent through precipitation. According to the method, the pH value does not need to be adjusted, the original electrolyte system is not damaged, and crystallization post-liquid can be directly sent back for electrolysis; the iron removal selectivity is high, the ratio of the iron removal rate to the antimony precipitation rate is larger than 80, and the purity of the ferrous oxalate in slag after purification reaches 98% or over; and the process is environment-friendly and economical, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and relates to a wet antimony smelting process, in particular to a method for selectively removing iron from an antimony ore slurry electrolyte and preparing high-purity ferrous oxalate. Background technique [0002] Slurry electrolysis is a process that combines ore leaching, partial leachate purification and electrolytic deposition in one device, and utilizes the anodic oxidation reaction in the electrolytic deposition process to leach valuable elements in the ore. my country's pulp electrolysis technology is at the leading level in the world. Beijing General Research Institute of Mining and Metallurgy has successfully obtained metal bismuth from bismuth concentrate by direct electrolysis through pulp electrolysis technology. Wang Chengyan and others pointed out through theoretical research that complex antimony-lead ores can also extract antimony through slurry electrolysis ...

AI Technical Summary

Problems solved by technology

[0005] The antimony slurry electrolyte is antimony-containing hydrochloric acid solution with high acidity (hydrochloric acid concentration 0.5-1mol / L) and low iron content (total Fe concentration 6-10g / L). The amount is large, and the acid loss is large, and the cost is high

Although the iron in the electrolyte can be removed by the above-mentioned iron removal method, it not only needs to change the electrolyte system, but also causes a large amount of loss of antimony, which makes it difficult to realize the selective separation of iron, which is not conducive to the recycling of the electrolyte and the removal of antimony. Recovery and Comprehensive Utilization of Heavy Iron Products

Although the Chinese patent CN200810241902.9 proposes a method for preparing ferrous oxalate by pickling waste liquid, this method needs to adjust the pH value of the solution system, and also needs to add iron filings to regulate the acidity of the waste liquid. The process is complicated and greatly changes the solution system. , it is difficult to meet the requirements of iron removal by antimony slurry electrolyte

However, there is no literature report on the selective iron removal method of antimony ore slurry electrolyte with the above characteristics.

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