(中南大学 资源加工与生物工程学院，长沙 410083)
摘 要: 通过浮选试验、红外光谱分析、吸附量测试、动电位测试等研究六偏磷酸钠对方解石浮选行为与表面性质的影响。浮选试验结果表明，六偏磷酸钠很好地抑制方解石的上浮。机理测试则表明，六偏磷酸钠未大量吸附在方解石表面，而是在其作用下，方解石表面的金属离子Ca2+从固相转入液相，减少方解石表面捕收剂吸附的活性点，从而实现方解石的浮选抑制。
关键字: 方解石；六偏磷酸钠；浮选；抑制机理
（School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The effect of sodium hexametaphosphate on the flotation of calcite and its surface properties was investigated by flotation test, IR spectroscopy, adsorptive capacity and ζ potential. The flotation result shows that the inhibition of calcite is remarkable when the sodium hexametaphosphate is used. The mechanism tests indicate that hexametaphosphate is not adsorbed too much on the surface of calcite, and the active points of adsorption on the calcite are decreased for Ca2+ on the surface of calcite taken from solid phase to liquid phase under the action of hexametaphosphate, thus calcite is inhibited.
Key words: calcite; sodium hexametaphosphate; flotation; inhibition mechanism
