(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。
关键字: 菱锰矿；方解石；六偏磷酸钠； 钙离子；浮选
（1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Department of Biology and Chemical Engineering, Chaoyang Teachers College, Chaoyang 122000, China）
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
