赤泥还原法提铁-脱碱尾渣制备水泥熟料

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (12): 4378-4388.

赤泥还原法提铁-脱碱尾渣制备水泥熟料

王亚丽^1,2, 李依洋¹, 王玲玉¹, 丁思哲¹, 姚羽涵¹

1.北京工业大学材料科学与工程学院,北京 100124;
2.工业大数据应用技术国家工程实验室,北京 100124

收稿日期:2023-07-07 修订日期:2023-09-07 出版日期:2023-12-15 发布日期:2023-12-12
作者简介:王亚丽(1978—),女,博士,教授。主要从事生态环境材料、水泥水化与水泥基材料、固体废弃物建材资源化方面的研究。E-mail:wangyali1978@bjut.edu.cn
基金资助:
北京市科技计划(Z221100007522002)

Preparation of Cement Clinker from Red Mud Reduction Iron Recovery-Dealkalization Tailings

WANG Yali^1,2, LI Yiyang¹, WANG Lingyu¹, DING Sizhe¹, YAO Yuhan¹

1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. National Engineering Laboratory of Industrial Large Data Application Technology, Beijing 100124, China

Received:2023-07-07 Revised:2023-09-07 Online:2023-12-15 Published:2023-12-12

摘要/Abstract

摘要： 赤泥中较高的铁含量和碱性限制了其在水泥中的应用,为提高赤泥在水泥中的利用率,本文研究赤泥高温还原法提铁,电石渣水热离子置换法和草酸法对提铁赤泥的脱碱,使用提铁-脱碱重构后的赤泥制备水泥熟料。结果表明:在煅烧温度为1 400 ℃,保温时间为1 h,稻壳灰掺量为9.08%(质量分数),冷却方式为水冷的条件下,赤泥提铁率为77.24%,提铁后赤泥中铁的质量分数为9.39%;在反应温度为90 ℃,提铁赤泥、电石渣质量比为1:1,液固比(mL/g)为6,反应时间为7 h的条件下,电石渣水热离子置换法的脱碱率为89.30%,脱碱后重构赤泥中Na₂O的质量分数为0.592%;生料率值为石灰饱和系数0.88,硅率2.4,铝率1.4时,重构赤泥配制的水泥生料在1 300~1 450 ℃的煅烧温度范围内均具有较好的易烧性,煅烧温度为1 350 ℃时,熟料中晶粒形状为不规则多边形,晶粒形貌正常,确定掺加重构赤泥制备水泥熟料的最佳煅烧温度为1 350 ℃。

关键词: 赤泥, 稻壳灰, 还原法提铁, 电石渣, 脱碱效率, 水泥熟料

Abstract: There are too much iron and alkaline in red mud, which hinders its utilization in cement. In order to enhance the reusing rate of red mud in cement material, this research paid adequate attention on reduction methods for iron recovery from red mud, water heated ion-exchanging methods using calcium carbide slags and oxalic methods for dealkalization of red mud, eventually used refactored red mud after iron recovery and dealkalization to prepare cement clinker. The results show that under the optimized condition that the sintering temperature is 1 400 ℃, lasting time is 1 h, rice husk ash adding content is 9.08% (mass fraction), cooling method is water cooling, the iron recovery rate of red mud is 77.24% while the content of iron declines to 9.39% (mass fraction) after iron recovery. Under the condition that reacting temperature is 90 ℃, deironed red mud and calcium carbide slags mass ratio is 1:1, liquid to solid rate (mL/g) is 6, reacting time is 7 h, the dealkalizaiton rate of ion exchanging methods using calcium carbide slags is 89.30%, meanwhile, the content of Na₂O in refactored red mud drops to 0.592% (mass fraction), which meets the requirement for cement ingredients that alkaline content must be lower than 1%. When the rate value of cement raw material, namely the lime saturation factor is 0.88, silicon rate factor is 2.4, aluminum rate factor is 1.4, cement raw materials prepared using refactored red mud possess good burnability under the sintering temperature ranging from 1 300 ℃ to 1 450 ℃. When the sintering temperature is 1 350 ℃, grains in cement clinkers show as irregular polygons with normal morphology. Accordingly, the optimum sintering temperature for cement clinker preparation adding refactored red mud is 1 350 ℃.

Key words: red mud, rice husk ash, reduction method for iron recovery, calcium carbide slag, dealkalization rate, cement clinker

中图分类号:

TQ172

王亚丽, 李依洋, 王玲玉, 丁思哲, 姚羽涵. 赤泥还原法提铁-脱碱尾渣制备水泥熟料[J]. 硅酸盐通报, 2023, 42(12): 4378-4388.

WANG Yali, LI Yiyang, WANG Lingyu, DING Sizhe, YAO Yuhan. Preparation of Cement Clinker from Red Mud Reduction Iron Recovery-Dealkalization Tailings[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4378-4388.

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