文献类型：期刊文献

中文题名：赤泥活化煤矸石提取Al_(2)O_(3)试验研究

英文题名：Experiment of Al_(2)O_(3) Extraction from the Activated Red Mud and Coal Gangue

作者：季登会 罗文波 龙潇 向春 王晓福

第一作者：季登会

机构：[1]云南锡业研究院有限公司,云南个旧661000;[2]贵州理工学院材料与能源工程学院,贵州贵阳550003

第一机构：云南锡业研究院有限公司,云南个旧661000

年份：2023

卷号：43

期号：2

起止页码：142-147

中文期刊名：矿产保护与利用

外文期刊名：Conservation and Utilization of Mineral Resources

收录：CSTPCD

基金：国家自然科学基金(51904083)。

语种：中文

中文关键词：赤泥;煤矸石;活化;焙烧;浸出;氧化铝

外文关键词：red mud;coal gangue;activation;roasting;leaching;aluminum oxide

摘要：赤泥和煤矸石都含有大量有价金属铝,可以作为铝土矿替代资源之一。通过在赤泥和煤矸石中配入碳酸钠、碳酸钙,混匀后高温焙烧,利用赤泥中残余的碱及配入的碳酸钠、碳酸钙活化赤泥及煤矸石,使矿物中难溶的氧化铝转变为易溶出的铝酸钠,二氧化硅转变为难溶出的硅酸钙,焙烧后物料碱浸出提铝。优化的焙烧工艺参数为:焙烧温度1 250℃、焙烧时间45 min、Na_(2)O/(Al_(2)O_(3)+Fe_(2)O_(3))摩尔比1.1∶1、Ca O/SiO_(2)摩尔比2∶1,在此条件下,赤泥、煤矸石中氧化铝转化率高,焙烧矿样铝的浸出率为78.45%。该工艺技术利用赤泥中的残碱活化作用,可以极大减少碳酸钠等试剂的加入,降低生产成本,减少环境污染。
Red mud and coal gangue contain a large amount of aluminum,which can be used as a substitute of bauxite.The mixture of red mud and coal gangue with the addition of sodium carbonate and calcium carbonate were calcinated in high-temperature,resulting in the insoluble alumina and silicon dioxide in the minerals transformed into soluble sodium aluminate and insoluble calcium silicate respectively,through activating red mud and coal gangue by alkali in red mud,sodium carbonate and calcium carbonate.Furthermore,the aluminum was extracted by alkali leaching from the calcined product.The optimum calcination parameters was a temperature of 1250℃,a calcination time of 45 min,a Na_(2)O/(Al_(2)O_(3)+Fe_(2)O_(3))molar ratio of 1.1∶1,and CaO/SiO_(2) molar ratio of 2∶1,and the leaching rate of aluminum reached 78.45%with a higher conversion rate of alumina in red mud and coal gangue.The process takes advantage of the residual alkali in red mud and significantly reduces the dosage of reagents such as sodium carbonate,thereby reducing production costs and environmental pollution.