摘要
从高铝粉煤灰的矿相特性入手,研究转化剂的种类及用量、温度、时间、液固比等对高铝粉煤灰钙矿相转化行为的影响及其反应机理,并提出了高铝粉煤灰制备铝硅合金新工艺。结果表明,高铝粉煤灰中Al2O3和SiO2含量之和达到70%以上,Ca元素主要以CaSO4形式存在,还有一部分以2CaO·Al2O3·SiO2形式存在。粉煤灰中钙矿相转化为碳酸钙后对后续酸浸除杂过程中氧化铝损失影响不大,但能够大幅度提高除钙率。高铝粉煤灰钙矿相转化最佳条件为:转化剂Na2CO3添加量为2倍理论值、转化温度60℃、反应时间1.5h、液固比4,在此条件下除钙率能够达到90%以上。
Based on mineral characteristics of high-alumina fly ash,effects of type and dosage of transforming agent,temperature,time and L/S on conversion behavior of calcium-bearing minerals in high-alumina fly ash were studied,and a new process to prepare Al-Si alloy from high-alumina fly ash was proposed.The results show that total content of Al2O3 and SiO2 in high-alumina fly ash is 70%above,and Ca element in fly ash mainly exists in forms of CaSO4 and 2CaO·Al2O3 ·SiO2.Transformation of calcium-containing minerals has almost no influence on loss rate of alumina in subsequent acid leaching process to remove impurities,but greatly improves calcium removing rate.Calcium removing rate is 90%above under the optimum conditions for phase conversion of calcium-containing minerals including dosage of conversion agent of Na2CO3 of twice theoretical amount,transformation temperature of 60℃,reaction time of 1.5 h,and L/S=4.
作者
王焱
江熠
姜传宁
曹润彬
耿学哲
潘晓林
WANG Yan;JIANG Yi;JIANG Chuan-ning;CAO Run-bin;GENG Xue-zhe;PAN Xiao-lin(School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2020年第3期85-90,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家级大学生创新创业训练计划项目(201910145088)。
关键词
粉煤灰
矿相转化
硫酸钙
酸法浸出
氧化铝
fly ash
phase transformation
calcium sulfate
acid leaching
alumina
