Methods of silica removal from pyrometallurgical processing wastes of ilmenite concentrate

IF 0.8 Q4 METALLURGY & METALLURGICAL ENGINEERING

Kompleksnoe Ispolzovanie Mineralnogo Syra Pub Date : 2022-05-02 DOI:10.31643/2022/6445.32

A. Ultarakova, Z. Karshyga, N. Lokhova, M. Naimanbaev, A. Yessengaziyev, P. Burns

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引用次数: 2

Abstract

This article presents a study on the processing of waste dust from electrical smelting of ilmenite concentrates with the removal of silica from them by alkaline and fluoride methods. The study of the smelting dust leaching by caustic soda solutions included investigation of the effect of sodium hydroxide concentration, process time, temperature, S:L ratio. The optimum conditions of concentrate electric smelting dust leaching - temperature 80-90 °С, duration 90-120 minutes, S:L ratio = 1:5, sodium hydroxide solution concentration 110-115 g/dm3 were determined. The optimum conditions for fluorination of electric melting dust were determined, at which the sublimation degree of silicon fluoride was 84.2 %. Studies have been performed to decomposite obtained silicon-containing sublime in the presence of ammonia agent. The optimum pyrolysis modes that provide the separation of fluoride and silicon oxide - temperature 530-560 °C and duration of 60-80 min have been determined based on the results of thermal analysis and studies on the process duration effect. The silicon oxide content in the obtained product was 96.3%.

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钛铁矿精矿火法冶炼废渣中二氧化硅的去除方法

研究了用碱性法和氟化法去除钛铁矿精矿电冶炼废尘中二氧化硅的处理方法。以烧碱溶液浸出冶炼粉尘为研究对象，考察了氢氧化钠浓度、浸出时间、浸出温度、硫硫比等因素对浸出效果的影响。确定了精矿电浸粉尘的最佳浸出条件:温度80 ~ 90°С，浸出时间90 ~ 120 min，硫液比= 1:5，氢氧化钠溶液浓度110 ~ 115 g/dm3。确定了电熔粉尘氟化的最佳条件，在此条件下氟化硅升华度为84.2%。研究了在氨剂的存在下，对所得的含硅升华进行了复合。根据热分析结果和工艺时间效应研究，确定了氟化物与氧化硅分离的最佳热解模式:温度530 ~ 560℃，持续时间60 ~ 80 min。所得产品中氧化硅含量为96.3%。

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来源期刊

Kompleksnoe Ispolzovanie Mineralnogo Syra Multiple-

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