氯化钾反浮选药剂的膜技术分离研究

Application of Membrane Separation Technology in Potassium Chloride Reverse Flotation Reagent Separation

以含氯化钾反浮选药剂料液为研究对象,将膜分离技术应用于盐湖卤水中氯化钾反浮选药剂分离,研究开展药剂含量、操作压力、温度、无机盐离子种类及含量等工艺条件对无机陶瓷膜和聚酰胺复合膜分离药剂效果影响。结果表明,药剂截留率随着药剂含量的增加而增加,随着膜孔径、料液温度的增大而减小,以操作压力小于1.5 MPa、料液温度低于30℃为宜。无机盐对聚酰胺复合膜通量影响显著,其中MgCl2影响最大;膜通量随着盐含量的升高而下降,药剂截留率均随着盐浓度的升高而逐渐增加;20℃,操作压力1.0 MPa,料液浓度400 mg/L时,聚酰胺复合膜1、2、3对药剂截留率分别达到98.5%、94.9%、89.9%。

Taking the potassium chloride reverse flotation reagent liquid as the research object, the membrane separation technology was applied to the separation of potassium chloride reverse flotation reagent in salt lake brine, and the effects of technological conditions such as reagent content, operating pressure, temperature, type and content of inorganic salt ions on the reagent separation efficiency by inorganic ceramic membrane and polyamide composite membrane were studied. The results showed that, the interception rate of reagent increased with the increase of the reagent content, decreased with the increase of the pore size of the membrane and the temperature of the feed liquid, and the suitable operating pressure was less than 1.5 MPa, and the temperature of the feed liquid was lower than 30 ℃. Inorganic salts had a significant effect on the flux of organic membranes, of which MgCl2 had the greatest influence. The membrane flux decreased with the increase of salt content, and the interception rate of medicament increased with the increase of salt content. When temperature was 20 ℃, the operating pressure was 1.0 MPa, mass concentration of feed liquid was 400 mg/L, the interception rate of reagent by polyamide composite membrane 1, 2, 3 reached 98.5%, 94.9% and 89.9% respectively.