Preparation of metallurgical grade alumina by calcination of crystalline aluminum chloride
GUO Qiang
XIAO Yongfeng
WANG Baodong
SUN Qi
Abstract：In order to prepare qualified metallurgical grade alumina by calcination of crystalline aluminum chloride,the effect of calcination temperature and time of crystalline aluminum chloride on the decomposition rate and the physical properties of alumina was studied by lao boratory static experiment.The results show that the calcination temperature and time are 250 ～ 350 ℃ and 0.5 ～ 3 h at low temperature region,and the calcination temperature and time are 1 000 ～ 1 100 ℃ and 15 ～ 60 min at high temperature region.A small amount of water vapor was introduced into the roasting process to benefit the decomposition of crystalline aluminum chloride.By characterization of the physical properties of alumina,it is found that the particle size and specific surface area of the alumina products obtained by the two-step process are higher than the one-step method.With the increase of the calcination temperature,the particle size and specific surface area of the alumina decreases.In addition,the particle size of the alumina increases with particle size of crystalline aluminum chloride.
Keywords：crystalline aluminum chloridecalcinationchlorine contentphysical properties
Publication Date：2017-01-01