Method for preparing sodium antimonate through pressurizing oxidation of sodium salt system

Abstract

A method for preparing sodium antimonate through pressurizing oxidation of a sodium salt system comprises the following steps: at first, a reductant is added into a high-temperature water solution of antimony soot to perform pressurizing reduction water leaching to remove arsenic; then pressurizing reduction alkali antimony leaching is performed on pressurizing reduction water leaching slag in a sodium hydroxide system; after that, sodium sulfide is added into the pressurizing reduction alkali leaching solution for purification and lead removal; at last, oxygen is injected into the purified solution at high temperature to perform pressurizing oxidation to precipitate a sodium antimonate product; and the solution subjected to oxidation is returned to the pressurizing reduction alkali leaching process. Substantially, the three purposes of arsenic dissolution, antimony dissolution and antimony oxidation are achieved by adoption of three modes including pressurizing reduction water leaching, pressurizing reduction alkali leaching and pressurizing oxidation precipitation, the leaching rate of arsenic in the pressurizing reduction water leaching process is 90.0% or above, the leaching rate of antimony in the pressurizing reduction alkali leaching process is 90.0% or above, the antimony precipitation rate in the pressurizing oxidation precipitation process is 99.0% or above, the qualified sodium antimonate product is finally prepared, and under the combined function, the purposes of removing arsenic from antimony soot and preparing the qualified sodium antimonate product are achieved. The method has the advantages of high antimony direct recovery rate, good product quality and low cost.

Description

technical field [0001] The invention relates to a heavy metal metallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for effectively preparing sodium pyroantimonate by pressure oxidation of antimony soot in a sodium salt system. Background technique [0002] Antimony is a silvery-white metal that is brittle and has poor electrical and thermal conductivity. It is mainly used in alloys, military industry, flame retardants and glass industries. my country is the country with the largest antimony output in the world. In 2010, the world's antimony output was 167,000 tons, while China's antimony output reached 150,000 tons in 2010, accounting for more than 89% of the world's antimony output. my country's antimony resources and production All have irreplaceable advantages. The mineral raw materials for antimony smelting mainly include stibnite, antimony gold ore and brittle lead antimony ore, etc., while antimony soot is an importa...

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Problems solved by technology

[0012] According to the advantages and disadvantages of the above-mentioned methods, which method to choose to prepare the sodium pyroantimonate product, on the one hand, it is necessary to overcome the traditional low leaching rate, and on the other hand, it is necessary to reduce the amount of oxidant to achieve the purpose of reducing production costs. Therefore, We proposed to prepare sodium pyroantimonate product by pressurized oxidation method in sodium hydroxide system

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