FTC海水淡化浓盐水蒸发结晶析盐规律研究  

Study on salt precipitation law in evaporation crystallization process of concentrated brine from FTC seawater desalination

作　　者：刘元元[1] 范天博[1] 张亚南[1] 周永红[1] 郭洪范[1] 李雪[1] 刘云义[1] 

机构地区：[1]沈阳化工大学精细化工协同创新中心,辽宁沈阳110142

出　　处：《无机盐工业》2016年第6期16-19,共4页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(61102041);辽宁省高校创新团队支持计划资助项目(2013010);国家科技支撑计划项目(2013BAB09B01);辽宁省教育厅项目(L2013169);辽宁精细化工协同创新中心创新团队资助项目

摘　　要：以过流式电容法（FTC）排出的海水淡化浓盐水为原料,按照制盐工业通用国家标准中的化学分析方法并结合钾钠火焰光度计等仪器分析方法,在蒸发率不同的情况下测定了蒸发结晶盐及剩余浓盐水中的元素组成。对不同蒸发率条件下析出盐和剩余溶液中元素组成变化的分析结果表明：对蒸发剩余溶液中的离子含量进行数据拟合,利用溶度积常数回算得到的误差符合标准。在浓盐水蒸发率为12.67%-39.33%时可以得到平均质量分数达到99.08%的氯化钠;在蒸发率为72.58%-81.58%时硫酸钙析出最多;在蒸发率为66.00%-81.58%时镁盐析出较多。得到的析盐规律为进一步对FTC海水淡化浓盐水进行资源化处理提供重要的数据依据。Taking concentrated brine obtained from seawater desalination by flow through capacitor（FTC） method as raw material,elementary compositions of crystalloid salt and reminder brine in the crystallization process were measured under different evaporation rates,according to general national standard of chemical analysis method in salt industry and potassium sodium flame photometer instrumental analysis method.After analyzing elemental composition changing at different evaporation rates,it was found that the data fitting was made for the ion contents in the reminder brine,and the error back-calculated by solubility product algorithm met the standard.The average mass fraction of the salt reached 99.08% when the evaporation rate was between 12.67% and 39.33%;Ca SO4 separated out the most when the evaporation rate was between 72.58% and81.58%;and magnesium salt had a larger quantity when the evaporation rate was between 66.00% and 81.58%.In addition,the precipitation law of salt can provide important data for resourceful treatment of the brine obtained by FTC method.

关 键 词：海水淡化 蒸发 离子迁移 结晶 浓盐水 

分 类 号：TS352[轻工技术与工程]