AlCl<sub>3</sub>∙6H<sub>2</sub>O中Mg杂质的去除工艺

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摘要 AlCl₃·6H₂O(ACH)是粉煤灰盐酸法提取Al₂O₃工艺中的重要中间产物,其纯度直接决定产品Al₂O₃的纯度,采用洗涤法去除ACH携带的杂质是提高其纯度的重要手段。本文从多个方面对ACH的洗涤工艺参数进行研究。通过实验发现,饱和AlCl₃溶液作洗液时,采用淋洗的效果略好于搅洗,且洗涤3次与洗涤4次的洗涤效率接近;原料中杂质MgO的含量越高,洗涤后产品中杂质MgO的含量也越高,对应的洗涤效率也相应升高。采用洗涤比即ACH质量与洗液质量的比值为1:1.5的洗涤效果强于洗涤比为1:1的洗涤效果,且3次洗涤后的晶体损失率分别为19.2%和16.7%,将洗液进行重复利用后,可大幅降低晶体的损失。质量分数为29%的HCl溶液的洗涤效果略低于饱和AlCl₃溶液,其3次洗涤后,晶体损失率达50%以上,重复利用后,可降低晶体的损失。

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	钞晓光
	高桂梅
	王宏宾
	曹坤
	戴崟
	松丽涛
	邹萍
	王永旺

关键词 ：粉煤灰, Al₂O₃, AlCl₃·6H₂O(ACH), 洗涤, MgO

Abstract：AlCl₃·6H₂O (ACH) is an important intermediate product in the process of extracting Al₂O₃ from fly ash by hydrochloric acid. The purity of ACH directly determines the purity of the product Al₂O₃. Among them, it is an important way to improve the purity of ACH by washing. In this paper, the washing process parameters of ACH were studied from many aspects. It was found that the washing effect of spray washing is slightly better than that of stirring washing when saturated AlCl₃ solution was used as the washing solution, and the washing efficiency of thre-times washing is similar to that of four-times washing. The higher the content of impurity MgO in the raw material, the higher the impurity MgO content in the product after washing. Stimultaneously, the corresponding washing efficiency is also increased. The washing effect of the ratio of 1:1.5 (mass of ACH/ mass of washing solution)is better than that of 1:1. After three times washing, the crystal loss rate is 19.2% and 16.7%, respectively. The loss rate of crystal can be greatly reduced when the washing solution is reused. The washing effect of HCl solution with mass fraction of 29% is slightly lower than that of saturated AlCl₃ solution. After three times washing, the crystal loss rate is more than 50%, and it can be reduced after the washing solution is reused.

Key words： fly ash Al₂O₃ AlCl₃·6H₂O(ACH) washing MgO

收稿日期: 2020-05-07 出版日期: 2021-01-18

ZTFLH:

TF114.3

基金资助:国家科技部“十二五”科技支撑计划项目(2011BAA04B05)

通讯作者: 王永旺,教授级高级工程师。电话：0477-3971898;E-mail: zgrwyw@163.com

引用本文:

钞晓光, 高桂梅, 王宏宾, 曹坤, 戴崟, 松丽涛, 邹萍, 王永旺. AlCl₃∙6H₂O中Mg杂质的去除工艺[J]. 粉末冶金材料科学与工程, 2020, 25(5): 433-439.
CHAO Xiaoguang, GAO Guimei, WANG Hongbin, CAO Kun, DAI Yin, SONG Litao, ZOU Ping, WANG Yongwang. Removal process of Mg impurity in AlCl₃∙6H₂O. Materials Science and Engineering of Powder Metallurgy, 2020, 25(5): 433-439.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I5/433

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