尿素包合法强化脂肪酸捕收剂的捕收性能

为考察采用尿素包合法处理脂肪酸提高其捕收性能的可行性,以江苏某P2O5含量为16.08%的磷矿石为试验矿样,采用不同包合条件获得的脂肪酸进行浮选试验。结果表明:以混合脂肪酸用量为50 g、剂尿比(乙醇体积与尿素质量之比)为3 m L/g、尿脂比(尿素与脂肪酸的质量比)为1.5、包合次数为2次条件下获得的脂肪酸为捕收剂,以碳酸钠为调整剂、硅酸钠为抑制剂对试样进行1次浮选,可获得P2O5品位为18.13%、回收率为92.17%的磷精矿,与未进行包合处理的脂肪酸的浮选结果相比,精矿P2O5品位提高了0.29个百分点、回收率提高了15.92个百分点,说明包合处理可使脂肪酸的捕收能力大幅增强。Materials Studio(MS)软件分析表明:饱和脂肪酸能被尿素包合,不饱和脂肪酸不能被尿素包合,因而通过尿素包合法可以实现不同饱和度脂肪酸的分离。而不饱和度越高的脂肪酸,低温浮选性能越好,因此可以通过尿素包合法提纯不饱和脂肪酸,进而提高脂肪酸的捕收性能。

Fatty Acid Collectors′Flotation Performance Strengthen Test Using Urea Adduction Method

In order to investigate the possibility of using urea adduction method treating mixed fatty acids to improve its flotation performance,flotation experiments using fatty acids obtained from different urea adduction conditions as collector was conducted taking phosphate ore with 16.08% P from Jiangsu Province as research sample.The results showed that using fatty acid,which was treated by urea adduction at conditions of mixed fatty acid dosage of 50 g,ratio of solvent to urea (ratio of volume of ethyl alcohol to mass of urea) is 3 mL/g,ratio of urea to mixed fatty acid (ratio of mass of urea to mass of fatty acid )is 1.5,and for two times of urea adduction reaction as collector,sodium carbonate as the regulator,sodium silicate as inhibitors via one time flotation experiment to float phosphate ore.Phosphate concentrate with 18.13% P2O5 and recovery of 92.17% is obtained.Compared with natural mixed fatty acid,P2O5 grade is increased by 0.29 percentage points,and recovery increased by 15.92 percentage points.Collecting performance of fatty acid could increased sharply by adduction method.Materials Studio (MS) software analysis shows that the saturated fatty acid can be crystallized by urea inclusion while the unsaturated fatty acid cannot be crystallized.Therefore,the fatty acids with different saturation can be separated by urea inclusion.As the higher the unsaturation degree,the flotation performance will be better at low temperature,thus flotation performance of fatty acid can be improved by purification of unsaturation fatty acid using urea addction method.