CAJ | 학술논문

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。
연구료AlCl3·6H2O재염산체계중적결정행위，고찰료철、개、미、갑、납등잡질대AlCl3·6H2O결정행위적영향，병이용취초광속반사측량기술（FBRM）화과립록영현미경（PVM）탐토료불동염산적가속도하AlCl3·6H2O 적결정립도분포급형모。결과표명，AlCl3·6H2O 적결정량수착염산가입량적증가이증가，당농염산가입량위AlCl3포화용액체적적2.25배시，25℃시적결정효솔가체도80%。용액중Fe적존재가촉진AlCl3·6H2O적결정，재1.5 mol·kg-1적AlCl3용액중，당려철마이비저우3：1시，득도적AlCl3·6H2O정체중철적함량소우0.1%。갑、개、미、납등잡질대AlCl3·6H2O적결정영향불대。염산첨가속도영향AlCl3·6H2O적형모，쾌적염산첨가속도역사정체발생단취，과립립경소，염산첨가속도교만시，가득도과립교대、형모호적단정。
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, Ca, Mg, 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, Ca, 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.