(1. 中南大學 資源加工與生物工程學院，長沙 410083；
2. 中南大學 戰(zhàn)略含鈣礦物資源清潔高效利用湖南省重點實驗室，長沙 410083)
摘 要: 戰(zhàn)略含鈣礦物螢石與方解石具有相似的表面鈣活性位點，導致兩者的高效分離是浮選領(lǐng)域世界難題之一。在本文中，綠色、低廉和具有特殊官能團的月桂酰肌氨酸鈉(SNLS)被用作一種新型螢石捕收劑。結(jié)果表明：在單礦物浮選試驗中，當pH 值為9.0和SNLS用量為1.5×10-5 mol/L時，螢石和方解石的回收率存在54.59%的最大差值。在人工混合礦浮選試驗中，當pH 值為9.0且不使用任何抑制劑時，用量為1.3×10-5 mol/L的SNLS可實現(xiàn)螢石和方解石的選擇性分離。與方解石相比，SNLS在螢石表面吸附更多，其原因是螢石表面的鈣原子密度更大和活性更高，使得SNLS在螢石表面吸附更強。因此，SNLS在螢石和方解石表面顯著的吸附行為差異為工業(yè)上螢石的高效分選提供了可能。
關(guān)鍵字: 螢石；方解石；浮選；月桂酰肌氨酸鈉；捕收劑
（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
