【摘要】 本文以酸化硅酸钠和酸化硅酸钠加铁盐作为分散剂,对常见脉石矿物石英的微细颗粒在PH为10.5的碳酸钠溶液中的分散稳定性进行了试验研究,发现上述两种分散剂都比单独硅酸钠本身的分散作用强,浮选精矿的品位高;认为其作用机理是在实验条件下所形成的亲水性胶体对细粒石英的分散起了保护胶体的作用。细粒脉石矿物的稳定分散,有利于赤铁矿矿石阴离子捕收剂的浮选。更多还原

【Abstract】 Na2SiO3·9H2O(Ⅰ),Na2SiO3·.9H2O+HNO3(Ⅱ)and Na2SiO3·9H2O+HNO3 +Fe(NO3)3·9H2O(Ⅲ) solutions,used as dispersing agents,were tested for their relative dispersion powers acting on fine silica particles in which the dispersing agents Ⅱand Ⅲ were prepeared at a pH value of 3.Each of them was added to the fine silica pulp of pH 10.5 regulated by Na2CO3 and their dispersion powers were measured by sedimentation.It has been found that the dispersion powers areⅢ>Ⅱ>Ⅰ in order The metallurgical results of direct floatation tests of silicious hematite ore,using tall oil and diesel oil as the collectors for hematite,are also in the same order(Ⅲ>Ⅱ>Ⅰ).The higher dispersion powers of Ⅱ and Ⅲ are attributed to the formation of the protective colioids adsorbed on the silica surface as observed by the electronmicroscopic examination The potentials of quartz are also measured and considered to be related to the adsorption of protective colloids.更多还原