微细粒锡石的凝聚与分散——理论与实践

AGGREGATION AND DISPERSION OF ULTRAFINE CASSITERITE PARTICLES——THEORY AND APPLICATION

本文较全面地论述了在有及无浮选剂存在条件下矿浆体系中矿粒之间可能存在的各种相互作用势能，给出了各种相互作用势能的计算公式。通过锡石表面Ｚｅｔａ电位和接触角的测定，计算了在不同油酸钠浓度下微细粒锡石表面极性相互作用能量常数、ＤＬＶＯ相互作用势能和扩展的ＤＬＶＯ相互作用势能，预测并解释了细粒锡石在矿浆中的凝聚与分散行为。根据理论计算结果和沉降试验结果的对比，指出了ＤＬＶＯ理论在解释有浮选剂存在条件下的矿粒凝聚与分散行为的不足，以及扩展的ＤＬＶＯ理论的正确性和较好的预测可信度。本研究可为锡石矿物的分选提供重要依据，也是对这两个理论在实际应用方面的重要拓展。

very possible interactions in the presence or absence of flotation reagents were discussed in detail, and their calculation formulas given By means of measurements of zeta potential and contact angles on cassiterite surface, the polar interaction potential constant, the DLVO interaction potentials and extended DLVO interaction potentials on cassiterite surfaces were calculated The aggregation and dspersion behavior of cassiterite particles in pulp was predicted and explained Compared the theoretical calculation results with the sedimentation test ones, it was disclosed that DLVO theory could not very well explain aggregation and dispersion of cassiterite particles with satisfaction, and extended DLVO theory had predicting precision in the presence of flotation reagents This research will provide solid ground for separation of cassiterite, and extend application fields of both theories