Crystallization behavior of AlCl<sub>3</sub>·6H<sub>2</sub>O in hydrochloric system

GUO Yanxia; YANG Xi; CUI Huixia; CHENG Fangqin; YANG Fengling

doi:10.3969/j.issn.0438-1157.2014.10.029

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Crystallization behavior of AlCl₃·6H₂O in hydrochloric system

更新时间：2025-12-10

- Crystallization behavior of AlCl₃·6H₂O in hydrochloric system
- CIESC Journal Issue 10, Pages: 3960-3967(2014)
- 作者机构：
  
  山西大学资源与环境工程研究所, 国家环境保护煤炭废弃物资源化高效利用技术重点实验室,山西,太原,030006
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.10.029
  CLC： Q115
- Online First：05 October 2014，
  
  Published：05 October 2014
- 稿件说明：
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GUO Yanxia, YANG Xi, CUI Huixia, et al. Crystallization behavior of AlCl₃·6H₂O in hydrochloric system[J]. CIESC Journal, 2014, (10): 3960-3967. DOI: 10.3969/j.issn.0438-1157.2014.10.029.
DOI：

GUO Yanxia, YANG Xi, CUI Huixia, et al. Crystallization behavior of AlCl₃·6H₂O in hydrochloric system[J]. CIESC Journal, 2014, (10): 3960-3967. DOI: 10.3969/j.issn.0438-1157.2014.10.029. DOI：

摘要

研究了AlCl3·6H2O在盐酸体系中的结晶行为，考察了铁、钙、镁、钾、钠等杂质对AlCl3·6H2O结晶行为的影响，并利用聚焦光束反射测量技术（FBRM）和颗粒录影显微镜（PVM）探讨了不同盐酸滴加速度下AlCl3·6H2O的结晶粒度分布及形貌。结果表明，AlCl3·6H2O的结晶量随着盐酸加入量的增加而增加，当浓盐酸加入量为AlCl3饱和溶液体积的2.25倍时，25℃时的结晶效率可达到80%。溶液中Fe的存在可促进AlCl3·6H2O的结晶，在1.5 mol·kg-1的AlCl3溶液中，当铝铁摩尔比低于3：1时，得到的AlCl3·6H2O晶体中铁的含量小于0.1%。钾、钙、镁、钠等杂质对AlCl3·6H2O的结晶影响不大。盐酸添加速度影响AlCl3·6H2O的形貌，快的盐酸添加速度易使晶体发生团聚，颗粒粒径小，盐酸添加速度较慢时，可得到颗粒较大、形貌好的单晶。

Abstract

AlCl3·6H2O

one of the most widely used inorganic compounds

is commonly prepared by leaching alumina from coal gangue and coal fly ash. Its quality depends strongly on the crystallization process. In this paper

the crystallization behavior of AlCl3·6H2O in hydrochloride system and the effect of impurities including Fe

K and Na on the crystallization were studied. The results showed that the crystallization efficiency of AlCl3·6H2O increased with the volume of concentrated HCl (36% by mass) added. The crystallization efficiency of AlCl3·6H2O reached 80% at 25℃ when the volume ratio of HCl to AlCl3 solution was 2.25. The presence of Fe improved the crystallization efficiency of AlCl3·6H2O slightly. The content of Fe in AlCl3·6H2O crystallized from 1.5 mol·kg-1 of AlCl3 solution was < 0.1% by mass when the molar ratio Al:Fe was less than 3:1. Little effects of K

Mg and Na on the crystallization of AlCl3·6H2O were observed. Furthermore

the effect of feeding speed of concentrated hydrochloride on the particle size distribution and morphology of AlCl3·6H2O crystallization was investigated by focused beam reflectance measurement and particle vision measurement. It is demonstrated that a fast feeding speed of hydrochloride results in the formation of agglomerated crystals with small size

while a slower feeding speed leads to the formation of dispersive single-crystals with larger sizes and improved morphologies.

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Crystallization behavior of AlCl3·6H2O in hydrochloric system

DOI：10.3969/j.issn.0438-1157.2014.10.029

摘要

Abstract

关键词

Keywords

references

Crystallization behavior of AlCl₃·6H₂O in hydrochloric system