(1. 中南大学 资源加工与生物工程学院，长沙 410083；
2. 中南大学 战略含钙矿物资源清洁高效利用湖南省重点实验室，长沙 410083)
摘 要: 战略含钙矿物萤石与方解石具有相似的表面钙活性位点，导致两者的高效分离是浮选领域世界难题之一。在本文中，绿色、低廉和具有特殊官能团的月桂酰肌氨酸钠(SNLS)被用作一种新型萤石捕收剂。结果表明：在单矿物浮选试验中，当pH 值为9.0和SNLS用量为1.5×10-5 mol/L时，萤石和方解石的回收率存在54.59%的最大差值。在人工混合矿浮选试验中，当pH 值为9.0且不使用任何抑制剂时，用量为1.3×10-5 mol/L的SNLS可实现萤石和方解石的选择性分离。与方解石相比，SNLS在萤石表面吸附更多，其原因是萤石表面的钙原子密度更大和活性更高，使得SNLS在萤石表面吸附更强。因此，SNLS在萤石和方解石表面显著的吸附行为差异为工业上萤石的高效分选提供了可能。
关键字: 萤石；方解石；浮选；月桂酰肌氨酸钠；捕收剂
（1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China）
Abstract:The efficient separation of strategic mineral fluorite with calcite remains a challenge in the field of flotation since their surfaces have similar Ca active sites. In this work, sodium N-lauroylsarcosinate (SNLS), a green, low-cost surfactant with special groups, was developed as a novel fluorite collector. The results show that the maximum recovery difference of fluorite and calcite is 54.59% when the dosage of SNLS is 1.5×10-5 mol/L at pH value of 9.0. During the test of binary mixed minerals, SNLS possesses higher selectivity for fluorite than calcite at pH value of 9.0, using a low dosage of 1.3×10-5 mol/L without the addition of any depressants. More SNLS is adsorbed on fluorite than on calcite. The exposed Ca atoms of fluorite possess higher density and activity, making SNLS stronger adsorption on fluorite surfaces. Therefore, the significant difference in the adsorption behavior of SNLS on the surfaces of fluorite and calcite provides the possibility for the efficient separation of fluorite from calcite in industry.
Key words: fluorite; calcite; flotation; sodium N-lauroylsarcosinate; collector
