凝胶注模铁矿尾矿浆料流变性能的研究

Study on Rheological Properties of Iron Ore Tailings Slurry for Gel Casting

以梅山尾矿为原料配制成浆料,用NDJ-1型旋转式粘度计测定其粘度。研究了pH值、分散剂的含量、固相含量以及尾矿粒度对浆料流变性能的影响。结果表明:当pH值<6时,随着pH值的增加浆料的粘度呈下降趋势,当pH值>6时,随着pH值的增加浆料的粘度呈上升趋势;当分散剂的含量<0.25%时,随着分散剂含量的增加浆料的粘度呈下降趋势,当分散剂含量>0.25%时,随着分散剂含量的增加浆料的粘度呈上升趋势;随着固相含量的增加,浆料的粘度增加;随着球磨时间的增加,颗粒发生团聚,使得表观粒度增大,溶剂化后,颗粒充分分散,因而粘度呈上升趋势。

Slurry was prepared using Meishan tailing as raw materials. The viscosity of slurry was detected with NDJ- 1-type rotating viscometer. Effect of the pH value, dispersant content, solid-phase content, as well as the size of the tailings on the rheological properties of slurry were investigated. The result showed that： the slurry＇s viscosity decreased gradually when pH value less than 6, and the viscosity increased when pH value more than 6. When dispersant content was less than 0.25%, the slurry＇s viscosity decreased as the dispersant increased; It was opposite when dispersant content was more than 0.25%. With solid-phase content increasing, the viscosity of slurry was increased; With increase of milling time,the aggregation of particles took place, leading to the apparent size increased. The aggregation of particles was broken during the preparation of slurry, the particles would be fully dispersed,thus resulting in the viscosity of slurry increase.