六偏磷酸钠对菱锰矿与方解石浮选分离的影响

罗 娜^{1, 2}，张国范¹，朱阳戈¹，崔萌萌¹

(1. 中南大学 资源加工与生物工程学院，长沙 410083；
2. 朝阳师范高等专科学校 生化工程系，朝阳 122000)

摘 要：通过溶液化学计算、SEM-EDAX分析、ζ电位测试并结合浮选实验，以Na₂CO₃和六偏磷酸钠为调整剂，研究Ca²⁺存在体系中菱锰矿和方解石的浮选分离。结果表明：六偏磷酸钠对菱锰矿与方解石单矿物的浮选具有良好的选择性抑制作用，但在二者混合矿的浮选分离中，方解石溶出的Ca²⁺在调浆过程中可与Na₂CO₃反应生成CaCO₃吸附在菱锰矿表面，使二者表面性质趋同，难以实现浮选分离；改变药剂添加方式，优先加入六偏磷酸钠络合溶液中的Ca²⁺，阻止其在菱锰矿表面吸附，避免菱锰矿表面性质改变，再加入Na₂CO₃调节矿浆pH，最终实现菱锰矿与方解石的浮选分离。

关键词：菱锰矿；方解石；六偏磷酸钠； 钙离子；浮选

Effect of sodium hexametaphosphate on flotation separation of rhodochrosite from calcite

LUO Na^{1, 2}, ZHANG Guo-fan¹, ZHU Yang-ge¹, CUI Meng-meng¹

(1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Department of Biology and Chemical Engineering, Chaoyang Teachers College, Chaoyang 12)

Abstract:The separation of rhodochrosite from calcite was studied by solution chemistry calculations, SEM-EDAX, ζ potential measurements and flotation tests in the presence of Ca²⁺, using Na₂CO₃ and sodium hexametaphosphate (SHMP) as regulators. The results show that SHMP has good selective inhibition in the pure mineral flotation of rhodochrosite and calcite, while in the flotation separation of mixed mineral, Ca²⁺ dissolved from calcite during pulp conditioning reacts with Na₂CO₃ to produce CaCO₃ that adsorbs on the rhodochrosite surface. This situation makes the two minerals surface property similar and so it is difficult to achieve the flotation separation of rhodochrosite from calcite. When the method of chemicals addition is changed with SHMP added first, a complexation of Ca²⁺can be made, which avoids the adsorption of Ca²⁺ on rhodochrosite surface and prevents rhodochrosite surface property from changing. Then by adding Na₂CO₃ to adjust solution pH , the flotation separation of hodochrosite from calcite will be achieved finally.

Key words:rhodochrosite; calcite; sodium hexametaphosphate; Ca²⁺; flotation