六偏磷酸钠提高鄂西鲕状赤铁矿石磨矿效率研究

Study on Increasing the Grinding Efficiency of the Oolitic Hematite from Western Hubei Province with Sodium Hexametaphosphate

研究了六偏磷酸钠对鄂西鲕状赤铁矿磨矿效率提高的促进作用,并结合矿浆黏度、矿粒表面的吸附特性、矿粒表面电位以及磨矿产品颗粒形貌等指标的测定,对六偏磷酸钠的助磨机理进行了分析研究。结果表明:在试验给定的相同磨矿条件下,加入0.8%(占试样质量百分比)的六偏磷酸钠,可使磨矿产品中-0.074 mm的含量提高30.25个百分点;六偏磷酸钠通过降低矿浆的黏度、改变矿粒表面的吸附特性和矿粒表面电位、减少矿粒表面吸附的微细矿粒、增加矿粒表面的微细裂隙等方式促进鲕状赤铁矿的粉碎,提高其磨矿效率。

The paper described the improved grinding efficiency of the oolitic hematite from western Hubei Province in the presence of sodium hexametaphosphate（ SHMP）, and mechanism of SHMP used as grinding aids was analyzed by measuring the viscosity and pH value of the grinding pulp, the surface potential and morphology of particles after grinding. The results presented that the contents of - 0. 074 mm in the grinding products was increased by 30.25% by keeping other grinding parameters as constant and with the addition of 0.8% （mass ratio of the sample） of SHMP. By lessening the viscosity of pulp, raising pH value, changing the surface potential of the particles, reducing the amounts of fine ore grains sticking to granules and acting on the micro cracks on the ore grain surface, SHMP could work by all of these patterns to promote the crushing environment and then increase the grinding efficiency.