摘要
分别采用重结晶法和氟化沉淀法脱除硫酸锰溶液中的杂质镁。用Pitzer热力学模型对二元系MgSO4-H2O、MnSO4-H2O和三元系MgSO4-MnSO4-H2O的溶解度相图进行模拟预测,并结合溶解度相图对三元系的固溶体用重结晶法验证其分配比。同时采用氟化沉淀法进行对比试验。结果表明,由于固定分配比,重结晶法对镁锰分离作用十分有限,而加入MgF2晶种的氟化沉淀除镁新方法能够有效提高氟化沉淀法的效率,在95℃下,加入0.3g氟化镁晶种和250%理论用量的NH4F搅拌1h,能使镁的除去率达到94.3%。
Magnesium impurity was removed by recrystallization and fluoride precipitation in manganese sulfate solution, respectively. The solubility isotherms of binary systems MgSO4-H20, MnSO4-H20 and ternary system MgSO4-MnSO4-H20 were simulated and predicted with Pitzer thermodynamic model, and the distribution ratio of MgSO4 and MnSO4in solid phase-liquid phase was verified via recrystallization ex-periment. Magnesium was also removed by fluoride precipitation compared with the former. The results show that recrystallization exerts quite limited effect on the separation of Mg and Mn by recrystallization due to constant distribution ratio, and the efficiency is improved by adding MgF2 crystal seed in fluorina-tion. The removal rate of Mgis 94.3% at 95℃ with0.3 gMgF2 and250% NH4F for 1 h.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2012年第8期39-44,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(21176261)
湖南省自然科学基金项目(11JJ2011)
关键词
PITZER模型
相图
分配比
重结晶
氟化
晶种
MnSO4溶液
镁
Pitzer model
solubility isotherm
distribution ratio
recrystallization
fluorination
crystalseed
MnSO4 solution
magnesium
