芒硝型卤水中盐硝组分对碱法脱除钙镁的影响

Effects of Sodium Sulfate and Sodium Chloride on Ca^(2+),Mg^(2+) Removal from Glauber Type Brine by Sodium Hydroxide and Sodium Carbonate

采用"烧碱-纯碱"法,对芒硝型卤水中Ca2+和Mg2+的脱除进行了研究,在常温、两碱用量为理论用量、反应时间为30 min和陈化时间为60 min的条件下详细考察了卤水中氯化钠和硫酸钠含量的变化对Ca2+和Mg2+脱除效果的影响。结果表明,硫酸钠组分对Ca2+的脱除效果影响较大,当硫酸钠含量在30 g/L以下时,Ca2+脱除率在90%以上,硫酸钠浓度增加有利于Mg2+的脱除,但影响不大。氯化钠组分对Ca2+、Mg2+脱除效果的影响相对较小,氯化钠含量增加,Ca2+脱除率明显增加,而Mg2+脱除率略有下降。

Ca2＋、Mg2＋ removal from Glauber type brine by sodium hydroxide and sodium carbonate has been studied.The effects of sodium sulfate and sodium chloride on removal efficiency of Ca2＋,Mg2＋ at room temperature were investigated in detail when addition amount of sodium hydroxide and sodium carbonate was theoretical value,reaction time was 30 min,aging time was 60 min.The experimental results show that the presence of sodium sulfate has large effect on removal efficiency of Ca2＋.The removal rate of Ca2＋ is more than 90% when the concentration of sodium sulfate is below 30 g/L.The presence of sodium sulfate has good but little effect on removal efficiency of Mg2＋.The presence of sodium chloride has small effect on removal efficiency of Ca2＋ and Mg2＋.When the concentration of sodium chloride increases,the removal rate of Ca2＋ increases significantly,but the removal rate of Mg2＋ declines slightly.