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食盐水中的Ca~(2+)、Mg~(2+),一般以加纯碱和氢氧化钠沉淀法去除,但这些盐的溶解度大(CaCO_3:1.5×10~(-3)18°g/100g;NaOH_2:0.9×10~(-3)18°g/100g),在食盐水中还含有少量。对于离子交换膜或石棉隔膜来说,由于不纯物而使电流效率下降,槽电压上升,甚至隔膜破损等等。因此,特别对用于离子交换膜的食盐水的质量要求较高,不纯物含量要在1mg/1以下,最好是0.1mg/1以下
Salt water Ca2 + and Mg2 + are usually removed by soda ash and sodium hydroxide precipitation, but the solubility of these salts is large (CaCO3: 1.5 × 10 -3 (18) g / 100g; NaOH_2: 0.9 × 10 -3 (18 ° g / 100g)), also contains a small amount of salt water. For ion exchange membranes or asbestos membranes, the current efficiency is reduced due to impurities, the cell voltage is increased, and even the diaphragm is broken and so on. Therefore, the quality of salt water used for ion exchange membranes is particularly high, and the content of impurities should be 1 mg / l or less, preferably 0.1 mg / l or less