(1. 江西理工大学 江西省矿业工程重点实验室，赣州 341000；
2. 北京矿冶科技集团有限公司 矿物加工科学与技术国家重点实验室，北京 102628)
摘 要: 通过浮选试验、吸附量测试、红外光谱(FTIR)分析和X射线光电子能谱(XPS)分析，研究抑制剂海藻酸钠对磷灰石和方解石浮选的影响，考察海藻酸钠对两种矿物的抑制作用机理。浮选结果表明：pH=9时海藻酸钠可强烈抑制方解石，而对磷灰石浮选的影响较小。海藻酸钠在方解石表面的吸附量大于在磷灰石表面的吸附量。海藻酸钠主要通过氢键吸附在磷灰石表面，而在方解石上的吸附则是氢键结合和化学键合共同作用所致。因此，海藻酸钠在方解石上的吸附强于磷灰石，导致其对方解石的选择性抑制。
关键字: 磷灰石；方解石；抑制剂；海藻酸钠；分离机理
（1. Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. State Key Laboratory of Mineral Processing Science and Technology, Beijing Mining and Metallurgy Technology Group Co., Ltd., Beijing 102628, China）
Abstract:The effect and mechanism of flotation separation of apatite and calcite using depressant sodium alginate (SA) were investigated through flotation test, adsorption test, FTIR and XPS analysis. The results show that SA can strongly inhibit calcite while has little effect on apatite flotation at pH=9. The adsorption amount of SA on the calcite surface is greater than that on the apatite surface. SA adsorbs on apatite mainly through hydrogen bonding, while adsorption of SA on calcite is caused by hydrogen bonding and chemical bonding. Therefore, the adsorption of SA on calcite is stronger than on apatite, leading to a selective depression of calcite.
Key words: apatite; calcite; depressant; sodium alginate; separation mechanism
