海水淡化浓盐水等温蒸发过程硫酸钙析出规律研究  

Study on the Calcium Sulfate Crystallization Law in the Isothermal Evaporation of Desalination Brine

作　　者：陈丽芳[1] 刘同慧 詹志斌[1] 陈侠[1] 

机构地区：[1]天津科技大学海洋科学与工程学院,天津300457 [2]潍坊盐业公司,山东潍坊261011

出　　处：《盐业与化工》2011年第4期16-20,共5页Jounral of Salt and Chemical Industry

摘　　要：海水淡化在获得淡水的同时副产大量浓盐水,浓盐水的盐度、温度等均高于自然海水,如在渤海湾内直接大量排放浓盐水势必会对周围海洋环境造成污染,为此实现浓海水资源的综合利用势在必行。研究浓海水不同温度下等温蒸发过程硫酸钙的析出规律可以为浓海水综合利用提供理论依据。室内试验研究表明:不同温度下等温蒸发时硫酸钙析出点稍有变化,30℃等温蒸发硫酸钙析出点为密度1.108 8 g/cm3,此时水分蒸发率为58.4%,溶液硫酸钙质量分数5.4 g/kg;50℃等温蒸发硫酸钙析出点为密度1.109 4 g/cm3,此时水分蒸发率为60.1%,溶液硫酸钙质量分数5.6 g/kg;75℃等温蒸发硫酸钙析出点为密度1.100 0g/cm3,此时水分蒸发率为60.3%,溶液硫酸钙质量分数5.8 g/1 000 g;100℃等温蒸发硫酸钙析出点为密度1.068 0 g/cm3,此时水分蒸发率为53.4%,溶液硫酸钙质量分数4.4 g/1 000g。While gaining the fresh water in desalination,a large amount of brine appears as byproduct.Both the salinity and temperature of the brine are higher than nature seawater.If great quantities of brine are discharged directly into the Bohai bay,it will inevitably pollute the surrounding marine environment.Therefore,it is imperative to enforce the comprehensive utilization of concentrated seawater.The research which studies the law of calcium sulfate precipitation in the process of isothermal evaporation at different temperatures lays a fundamental theoretical basis for the comprehensive utilization of seawater.The results of laboratory experiment show that： in the process of isothermal evaporation the point of calcium sulfate crystallization changes slightly at different temperatures.In the process of 30℃ isothermal evaporation,when the calcium sulfate crystallizes,the density is 1.1088 grams per liter,water evaporation rate is 58.4%,and the concentration of calcium sulfate is 5.4 g/kg.While in the condition of 50 ℃,75 ℃ and100 ℃,the density are 1.1094,1.100 0 and 1.068 0 grams per liter respectively,water evaporation rate are 60.1%,60.3% and 53.4% respectively,the concentration of calcium sulfate are 5.6,5.8 and 4.4 g/kg,respectively.

关 键 词：浓盐水 等温蒸发 硫酸钙 析出规律 海水淡化 

分 类 号：P747[天文地球—海洋科学]