氯化钾废盐资源化利用相图研究  

Phase diagram study on resource utilization of potassium chloride waste salt

作　　者：张新航 李娜 巩学敏[2] ZHANG Xinhang;LI Na;GONG Xuemin(School of Mining Engineering,North China University of Science and Technology,Tangshan 063210,Hebei Province,China;School of Chemical Engineering,North China University of Science and Technology,Tangshan 063210,Hebei Province,China;School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]华北理工大学化学工程学院,河北唐山063210 [3]天津大学环境科学与工程学院,天津300350

出　　处：《化学工程》2025年第4期54-58,共5页Chemical Engineering(China)

基　　金：河北省自然科学基金面上项目(E2020209117)。

摘　　要：针对农药行业化工类企业面临的氯化钾废盐处理与资源化问题,研究25℃时K^(+)、Na^(+)//Cl^(-)、SO^(2-)_(4)-H 2 O四元体系相图特征,发现该相图中钾芒硝和硫酸钾的结晶区面积较大,可通过加入钾芒硝的方法提取氯化钾废盐中的钾资源。鉴于此,基于相关体系相平衡研究,结合水盐体系相图与相平衡理论,设计以氯化钾废盐和钾芒硝为原材料生产硫酸钾和氯化钠的工艺技术,同时生成副产物硫酸钙,并对工艺进行核算。计算结果表明:此工艺对氯化钾废盐的钾资源一次提取率为86.46%,可以很好地实现氯化钾废盐钾资源的回收与资源化,生成的剩余母液作为原料回流,实现循环生产。实验验证表明:生成的硫酸钾产品达到GB/T 2048—2008执行标准且设计的工艺确实可行,为氯化钾单一废盐的资源化利用提供重要的理论依据和数据支持,具有重要的现实意义。Addressing the issue of potassium chloride waste salt treatment and resource utilization faced by chemical enterprises in the pesticide industry,the phase diagram characteristics of the quaternary system K^(+),Na^(+)//Cl-,SO^(2-)_(4)-H_(2)O at 25℃was studied.It is found that the crystallization zones of glaserite and potassium sulfate occupy significant areas in this phase diagram,indicating that potassium resources in potassium chloride waste salts can be extracted by adding glaserite.In view of this,based on the study of phase equilibrium of related systems,and combined with the phase diagram of water-salt system and phase equilibrium theory,a process technology was designed to produce potassium sulfate and sodium chloride using potassium chloride waste salts and glaserite as raw materials.This process also generated by-product calcium sulfate.A comprehensive economic and technical evaluation was conducted on this process.The calculation results show that the one-time extraction rate of potassium resources from potassium chloride waste salts in this process is 86.46%,effectively achieving the recovery and resource of potassium resources from potassium chloride waste salts,the remaining mother liquor generated is refluxed as raw material to achieve circular production.Experimental verification shows that the generated potassium sulfate product meets the GB/T 2048-2008 execution standard and the designed process is indeed feasible,it provides important theoretical basis and data support for the resource utilization of potassium chloride single waste salt,which has important practical significance.

关 键 词：KCl废盐 相平衡 硫酸钾 资源化 

分 类 号：X78[环境科学与工程—环境工程]