蛇纹石的水溶特性对水镁石浮选的影响

选取四种不同粒级蛇纹石，利用Hallimond管考察了调浆时间对水镁石及蛇纹石回收率的影响，通过检测矿浆pH、Mg²⁺浓度、Zeta电位、接触角及矿浆黏度，系统研究了蛇纹石的水溶性及其对油酸钠捕收水镁石的影响.结果表明:随着调浆时间增加，蛇纹石表面Mg²⁺溶解量逐渐增加，致使蛇纹石Zeta电位降低.此外油酸根离子易与溶液中Mg²⁺作用，消耗大量油酸根离子，致使水镁石回收率降低;蛇纹石粒级越细、调浆时间越长，则蛇纹石矿浆黏度越大，浮选过程中泡沫稳定性越强，导致蛇纹石的泡沫夹带量增加.

Effect of Water Solubility of Serpentine on the Flotation of Brucite

Four kinds of serpentine with different grain size were selected， and the modified Hallimond tube was used to investigate the effect of conditioning time on the recovery of brucite and serpentine. By analyzing the properties of pulp pH， Mg²⁺ concentration， Zeta potential， contact angle and pulp viscosity， the water solubility of serpentine and its effect on the floatability of brucite by sodium oleate were systematically studied. The results showed that with the increase of conditioning time， the solubility of Mg²⁺ on serpentine surface increases gradually， resulting in reduction of serpentine Zeta potential. Furthermore， the oleate ion reacts easily with Mg²⁺ in solution to form magnesium oleate， so a large amount of oleate ion is consumed， resulting in a lower recovery rate of brucite. The finer the particle size of serpentine and the longer the conditioning time are， the greater the viscosity of the serpentine pulp is， which leads to the enhancement of foam stability during the flotation process， resulting in an increase in the foam entrainment rate of serpentine.