(1. 北京科技大学 土木与环境工程学院，北京 100083；
2. 中国科学院过程工程研究所 生化工程国家重点实验室，北京 100190)
摘 要: 研究十二胺浮选分离菱锰矿与方解石的行为，考察调整剂水玻璃、六偏磷酸钠和柠檬酸对菱锰矿和方解石浮选的影响。单矿物浮选结果表明：pH为7~8时，菱锰矿与方解石可浮性存在差异。人工混合矿浮选结果表明，菱锰矿与方解石可浮性相当，难以分离。红外分析结果显示，十二胺以物理吸附方式存在于菱锰矿与方解石表面。矿物晶格能、溶液化学计算和SEM-EDS表明，方解石的可浮性略大于菱锰矿的，混合矿中方解石表面向菱锰矿转化，导致两矿样表面性质相似而不可分离。
关键字: 菱锰矿；方解石；浮选；十二胺；水玻璃；六偏磷酸钠
（1. School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering,
Chinese Academy of Sciences, Beijing 100190, China）
Abstract:The flotation separation of rhodochrosite from calcite was studied, and the effects of sodium silicate, sodium hexametaphosphate and citric acid on the flotation separation of rhodochrosite from calcite were investigated through flotation tests. The flotation tests results of single mineral show that the floatability of rhodochrosite and calcite are different in pH range of 7-8. The flotation tests results of mixed mineral show that it is difficult to achieve the flotation separation of rhodochrosite from calcite. The FTIR measurements results indicate that dodecylamine can adsorb on the surfaces of rhodochrosite and calcite by physical adsorption. According to the lattice energy, solution chemistry calculation and SEM-EDS analysis, the flotability of calcite is stronger than that of rhodochrosite, the two minerals surface properties tend to be similar because the amount of Mn2+ dissolved from rhodochrosite is so great enough that it leads to the precipitation of MnCO3 on calcite surface.
Key words: rhodochrosite; calcite; flotation; dodecylamine; sodium silicate; sodium hexametaphosphate
