Method of using starch to reduce antimony oxide in low temperature molten salt

Abstract

The invention relates to a method of using starch to reduce antimony oxide in low temperature molten salt. According to the method, antimony oxide and starch are mixed, granulated, and dried, then granules are reduced in low temperature molten salt to produce antimony, and the method mainly comprises three phases: mixing-granulating-drying, low temperature molten salt preparation, and low temperature molten salt reduction. In low temperature molten salt, starch is used to reduced antimony oxide, the energy consumption of reduction melting is largely reduced, the temperature of reduction melting is reduced to 600-750 DEG C; at the same time, antimony oxide is mixed with starch, the mixture is granulated, dried, and added into low temperature molten salt, the starch loss during the combustion process is effectively prevented, and the utilization rate of starch is greatly increased.

Description

technical field [0001] The invention relates to an antimony metallurgical process in the field of nonferrous metallurgy, in particular to a pyrometallurgical method for reducing antimony oxide in low-temperature molten salt. Background technique [0002] Antimony is a silver-white non-ferrous 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. Mineral raw materials for antimony smelting mainly include stibnite, antimony gold ore, brittle lead-antimony ore, etc. At the same time, the antimony-containing soot produced in the smelting process of he...

AI Technical Summary

Problems solved by technology

Due to the use of reduced pulverized coal as a reducing agent, there are two problems: one is the high smelting temperature, in order to make the slagging components in the reduced coal slagging smoothly, the smelting temperature needs to be kept between 1100 and 1200 °C; the other is On the one hand, the volatilization loss of antimony is serious, and the volatilization and oxidation loss of antimony is serious at high temperature. The volatilization loss of antimony brought about by the two stages of drafting away and volatilization during the feeding process reaches between 35% and 50%, so the direct recovery rate of antimony is usually low, greatly Reduced production efficiency, these problems have been plagued by production enterprises

[0005] Although the patent ZL201610501989.3 proposes a method for low-temperature reduction smelting of antimony-containing compounds (Liu Weifeng et al. A method for low-temperature reduction smelting of antimony-containing compounds, ZL201610501989.3, date of authorization: 2017-12-01.), that is, antimony-containing compounds and Metal antimony can be obtained by reduction smelting after starch mixing. Starch reduction can reduce the reduction smelting temperature to 800-850°C, but there are still disadvantages of high reduction temperature, large consumption of reagents and serious volatilization of antimony. Based on this, we propose to use low-temperature molten salt Method for reducing antimony oxide to metal antimony by using starch

Images