Flotation separation of brucite and calcite in dodecylamine system enhanced by regulator potassium dihydrogen phosphate

调整剂磷酸二氢钾强化十二胺体系中水镁石和方解石的浮选分离

To achieve efficient flotation separation of brucite and calcite,flotation separation experiments were conducted on two minerals using dodecylamine(DDA)as the collector and potassium dihydrogen phosphate(PDP)as the regulator.The action mechanism of DDA and PDP was explored through contact angle measurement,zeta potential detection,solution chemistry calculation,FTIR analysis,and XPS detection.The flotation results showed that when DDA dosage was 35 mg/L and PDP dosage was 40 mg/L,the maximum floating difference between brucite and calcite was 79.81%,and the selectivity separation index was 6.46.The detection analysis showed that the main dissolved component HPO_(4)^(2−)of PDP is selectively strongly adsorbed on the Ca site on the surface of calcite,promoting the adsorption of the main dissolved component RNH_(3)^(+)of DDA on calcite surface,while brucite is basically not affected by PDP.Therefore,PDP is an effective regulator for the reverse flotation separation of brucite and calcite in DDA system.

为了实现水镁石和方解石的高效浮选分离,以十二胺(DDA)为捕收剂、磷酸二氢钾(PDP)为调整剂,进行两种矿物的浮选分离实验。通过接触角测量、zeta电位检测、溶液化学计算、傅里叶红外光谱分析和X射线光电子能谱检测等方法,研究DDA和PDP在两种矿物分选中的作用机理。浮选结果表明,当DDA用量为35 mg/L、PDP用量为40 mg/L时,水镁石与方解石的最大浮游差为79.81%,选择性分离指数为6.46。检测分析表明,PDP的主要溶解组分HPO_(4)^(2−)选择性地强烈吸附于方解石表面的Ca位点,促进了DDA的主要溶解组分RNH_(3)^(+)在方解石表面的吸附,而水镁石基本不受PDP的影响。因此,PDP是DDA体系中实现水镁石和方解石反浮选分离的有效调整剂。