天津科技大学学报2025，Vol.40Issue(6)：47-52,6.DOI:10.13364/j.issn.1672-6510.20250011
三元体系(NH4)2SO4-MgSO4-H2O在35℃和50℃下的相平衡
Phase Equilibrium of Ternary System(NH4)2SO4-MgSO4-H2O at 35℃and 50℃
摘要
Abstract
A large amount of ammonia nitrogen wastewater is produced in the process of acid decomposition and smelting of rare earth concentrate in Baiyun Ebo.In order to realize the efficient separation and utilization of ammonia nitrogen re-sources,the phase diagram data of ternary system(NH4)2SO4-MgSO4-H2O at 35℃and 50℃were determined by isother-mal solution equilibrium method.The results indicated three kinds of equilibrium solid phase precipitation in this ternary system,namely(NH4)2SO4,(NH4)2Mg(SO4)2·6H2O and MgSO4·nH2O(n=7,6),among which the phase region of(NH4)2SO4 and MgSO4·nH2O(n=7,6)was smaller,and the phase region of compound salt(NH4)2Mg(SO4)2·6H2O was larger,indicating that(NH4)2SO4 and MgSO4 are easy to form complex salt in aqueous solution.Furthermore,the phase diagram data of the ternary system in the temperature range of 0-96℃was evaluated,and the solubility data increased with the increase of temperature,and the complex salt phase region also increased,indicating that temperature increase is condu-cive to the precipitation of complex salt.These research results can provide a theoretical basis for the effective utilization of ammonia nitrogen resources in acid wastewater.关键词
(NH4)2SO4/MgSO4/相图/等温溶解平衡法Key words
(NH4)2SO4/MgSO4/phase diagram/isothermal dissolution equilibrium method分类
化学化工引用本文复制引用
李红霞,苗学怡,张国成,牟保畏,潘晓光,张宁..三元体系(NH4)2SO4-MgSO4-H2O在35℃和50℃下的相平衡[J].天津科技大学学报,2025,40(6):47-52,6.基金项目
内蒙古自然科学基金面上项目(2022MS02005) （2022MS02005）
内蒙古自治区"英才兴蒙"工程青年拔尖人才专项培养计划项目 （）
