仲钨酸铵结晶过程掺铬工艺研究  

Chromium Doping Technology in APT Crystallization Process

作　　者：万林生[1] 黄海[1] 赵立夫 章秋霖 

机构地区：[1]江西理工大学,江西赣州341000 [2]崇义章源钨业股份有限公司,江西崇义341300

出　　处：《中国钨业》2015年第1期56-60,共5页China Tungsten Industry

基　　金：国家高技术研究发展计划(863计划)资源与环境技术领域课题(2012AA061902)

摘　　要：研究了仲钨酸铵蒸发结晶过程掺铬工艺。通过结晶过程加入乙酸铬工艺制取了掺铬仲钨酸铵粉末。结果表明:铬主要以C(rOH)3沉淀形态先于仲钨酸铵析出,开始沉淀的p H≥9,在p H=8.5左右时,铬的析出率达到最大值,此后铬的沉淀—溶解接近平衡状态;铬在仲钨酸铵中的析出不具饱和性,控制掺铬量可制备不同铬含量的仲钨酸铵;C(rOH)3在(NH4)2WO4溶液中的溶解度比在水溶液中大,WO3浓度越高的溶液铬的析出率越低;提高起始NH4OH浓度、降低搅拌速度,可显著增大铬的析出率。APT powder doped with chromium is prepared by chromium acetated crystallization process. The results shows that chromium is mainly precipitated in the form of Cr （OH） 3 before APT with starting precipitated pH value ≥9. The precipitation rate of chromium reaches maximum （about pH=8.5）. The precipitation-dissolution of chromium reaches equilibrium state. The chromium contents of APT can be controlled by the amount of Cr-doped due to its unsaturated state. The solubility of Cr （OH） 3 in （NH4） 2WO4 solutions is larger than that in aqueous solution. The precipitation rate of chromium decreases with the the adding concentration of WO3. The precipitation rate of chromium can be significantly increased by increasing the initial concentration of and reducing stirring speed.

关 键 词：APT 蒸发结晶 掺铬工艺 

分 类 号：TG135.5[一般工业技术—材料科学与工程]