Role of Crystal Seed in Aluminum Hydroxide Crystallization from Ammonia System with Added NH_(4)Al(SO_(4))_(2)·12H_(2)O  

作　　者：王俊凯 李来时 LIU Feng WANG Yuzheng 吴玉胜 WANG Junkai;LI Laishi;LIU Feng;WANG Yuzheng;WU Yusheng(School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第4期945-953,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51974188);the Liaoning Revitalization Talents Program(No.XLYC2008014)。

摘　　要：A method to promote aluminum hydroxide crystal growth through pickling Al(OH)_(3)as seed in the ammonia system was proposed to overcome these defects.The experimental results show that,under the conditions of pickling time of 15 min,the acid concentration of 10%,the addition of 70 g/L pickling-Al(OH)_(3)seed,and the coarse granular Al(OH)_(3)products(d0.5=85.667)can be obtained.The characterization results show that the phase of the product is gibbsite,consistent with the seed.Moreover,the steps and ledges can be formed on pickling Al(OH)_(3)seed surface under the ammonia system,effectively promoting crystal growth.During crystal growth,the roughness of the crystal surface was first increased and then decreased,and the lamellar structure was deposited on the crystal seed surface.The final particles are approximately round,the surface is compact and dense.The growth of the product is surface reaction controlled.In addition,the content of the AlO_(6)unit is increased and contributed to Al(OH)_(3)crystal growth.

关 键 词：reactive crystallization coarse-grained Al(OH)_(3) crystal seed crystal growth process 

分 类 号：O78[理学—晶体学]