二段种分法制备氢氧化铝微粉的工艺

doi:10.3969/j.issn.1000-1565.2021.04.006

河北大学学报(自然科学版) ›› 2021, Vol. 41 ›› Issue (4): 378-383.DOI: 10.3969/j.issn.1000-1565.2021.04.006

二段种分法制备氢氧化铝微粉的工艺

刘艳玲¹,卫艳丽²

收稿日期:2020-10-20 发布日期:2021-09-03
通讯作者: 卫艳丽(1979—)
作者简介:刘艳玲(1976—),女,山西柳林人,吕梁学院副教授,主要从事应用化学方向研究.E-mail:liuyanling@llhc.edu.cn
基金资助:
山西省重点研发计划(201803D421019)

Preparation technology of aluminum hydroxide micropowder by two-stage seed separation

LIU Yanling¹,WEI Yanli²

1.Department of Chemistry and Chemical Engineering, Lvliang University, Lishi 033000, China; 2. Institute of Environmental Science, Shanxi University, Taiyuan 030006, China

Received:2020-10-20 Published:2021-09-03

摘要/Abstract

摘要： 为了研究煤矸石酸法提取物硫酸铝的应用及氢氧化铝精细化生产过程,进行了二段种分法制备氢氧化铝微粉的工艺研究.用煤矸石酸法提取的硫酸铝和拜耳法精制的铝酸钠稀释后的溶液反应,生成的浆液经放置老化后即得活性晶种.用活性晶种进行铝酸钠溶液的一段种子分解和二段种子分解,制备氢氧化铝微粉.同时研究了制备过程中种子浆pH、分解温度、种子比值、分解时间、铝酸钠溶液α_k及铝酸钠溶液质量浓度对分解率、氢氧化铝微粉颗粒粒度的影响.结果表明,煤矸石提取物硫酸铝做晶种引发剂,在一定的工艺条件下可制得白度大于99%、Fe₂O₃质量分数小于0.006%、SiO₂质量分数小于0.05%、吸油值小于0.70 mL/g、粒度在0.5~6 μm的氢氧化铝微粉.

关键词: 硫酸铝, 二段种分法, 氢氧化铝, 工艺条件

Abstract: In order to study the application of aluminum sulfate extracted by gangue acid method and the fine production of aluminum hydroxide, the preparation technology of aluminum hydroxide micropowder was explored using two-stage seed separation method. The active seeds could be obtained by the reaction of aluminum sulfate extracted by gangue acid method and diluted sodium aluminate solution refined by Bayer method. Subsequently, alumina micropowders were prepared by the decomposition of first and second stage seeds in sodium aluminate solution with active seed. Various factors affected on the decomposition rate and particle size of aluminum hydroxide micropowder were investigated including the pH value of the seed pulp, decomposition temperature, seed ratio, decomposition time, α_kof sodium aluminate solution and sodium concentration of aluminate solution. And the results showed that the as-prepared aluminium hydroxide powder exhibited whiteness above 99%, Fe₂O₃ and SiO₂ content less than 0.006% and 0.05%, respectively, oil absorption value less than 0.70 mL/g and the average particle size in the range of 0.5-0.6 μm.

Key words: aluminum sulfate, two-stage seed separation, aluminum hydroxide, process conditions

中图分类号:

TF19

刘艳玲,卫艳丽. 二段种分法制备氢氧化铝微粉的工艺[J]. 河北大学学报(自然科学版), 2021, 41(4): 378-383.

LIU Yanling,WEI Yanli. Preparation technology of aluminum hydroxide micropowder by two-stage seed separation[J]. Journal of Hebei University(Natural Science Edition), 2021, 41(4): 378-383.

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二段种分法制备氢氧化铝微粉的工艺

Preparation technology of aluminum hydroxide micropowder by two-stage seed separation

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