针对典型潘二煤矿高盐矿井水水质特点,结合硫酸钠Na2SO4、氯化钠NaCl溶解度变化规律及Na+//Cl-、SO2-4-H2O三元水盐体系相图,制订了分盐结晶工艺方案,考察盐分浓度、搅拌速率对结晶分离效果的影响。试验结果表明:副产高浓盐水溶解性总固体TDS质量浓度为109018.15mg/L,先控制温度为100℃,搅拌速率200r/min,蒸发终点NaCl的质量浓度为265.54g/L、Na2SO4的质量浓度为64.98g/L;后控制温度为-5℃,搅拌速率150r/min,冷冻终点NaCl的质量浓度为278.30g/L、Na2SO4的质量浓度为6.67g/L;再控制温度为100℃,搅拌速率100r/min,蒸发终点NaCl的质量浓度为302.68g/L、Na2SO4的质量浓度41.86g/L,在此方案下得到纯度97.3%的Na2SO4和95.2%的NaCl,盐产品达到工业标准,实现了盐的资源化利用,减少了杂盐的产生量。

According to the water quality characteristics of typical hyperhaline mine water in Pan’ er Coal Mine,the salt separation crystallization process scheme was formulated in combination with the solubility change rule of sodium sulfate Na2SO4 and NaCl and the phase diagram of Na+ / / Cl and SO2-4 -H2O ternary water salt system. The effects of salt concentration and stirring rate on crystallization separation were investigated. The experimental results show that the total dissolved solid TDS of by-product high concentrated brine is 109 018. 15 mg/ L,the temperature is controlled at 100 ℃,the stirring speed is 200 r/ min,and the mass concentration of NaCl and Na2SO4 at the evaporation terminal point is 265. 54 g/ L and 64. 98 g/ L respectively;after that,the temperature is controlled at -5 ℃,the stirring speed is 150 r/ min,the mass concentration of NaCl and Na2SO4 at the end of refrigeration is 278. 30g/ L and 6. 67g/ L respectively;then the temperature is controlled at 100 ℃,the stirring speed is 100 r/ min,the mass concentration of NaCl and Na2SO4 at the end of evaporation is 302. 68 g/ L and 41. 86 g/ L respectively. Under this scheme,the separation purities of Na2SO4 and NaCl is 97. 3% and 95. 2% respectively,which meet industrial standards. Therefore,this study realizes the resource utilization of salt,and reduces the amount of hybrid salt production.