Experimental study of magnesium extraction from calcium carbide precipitator dust by silicothermal method

被引：0

作者：

Shi, Ruimeng ^{[1
]}

Wang, Shuaimin ^{[1
]}

Ma, Hongzhou ^{[1
]}

Mi, Qiyuan ^{[2
]}

Dang, Yubo ^{[1
]}

Zeng, Jinyang ^{[1
]}

机构：

[1] Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China

[2] Chongqing Univ, Coll Mat Sci & Engn, 174 Shazheng St, Chongqing 400044, Peoples R China

来源：

METALLURGICAL RESEARCH & TECHNOLOGY | 2024年 / 122卷 / 01期

关键词：

calcium carbide precipitator dust; silicothermic reduction; thermodynamics; magnesium;

D O I：

10.1051/metal/2024101

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Calcium carbide precipitator dust is a kind of solid waste containing high calcium oxide and magnesium oxide produced in the process of calcium carbide production. The extraction of magnesium from dust by vacuum silicothermic reduction with ferrosilicon as a reducing agent was studied. The effects of heating temperature, holding time, addition of ferrosilicon and calcium-to-magnesium ratio on the volatilization rate of magnesium in dust were studied. The results indicate that when ferrosilicon is used at an Mg:Si molar ratio of 2:1.05, and calcium oxide to magnesium oxide in the dust at a CaO:MgO molar ratio of 1.2:1, heating the compressed mixture to 1300 degrees C for 3 h can achieve a magnesium volatilization rate of 91.65%. When the CaO/MgO ratio was less than 1, 2CaO <middle dot> MgO <middle dot> 2SiO2 and 3CaO <middle dot> MgO <middle dot> 2SiO2 containing MgO were formed, resulting in a decrease in the volatilization rate of MgO.

引用

页数：10

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