(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083；
2. 中南大學(xué) 戰(zhàn)略含鈣礦物資源清潔高效利用湖南省重點(diǎn)實驗室，長沙 410083；
3. 寧化行洛坑鎢礦有限公司，三明 365400)
摘 要: 研究了Al3+與硅酸膠粒自組裝得到的Al-Na2SiO3聚合物抑制劑在苯甲羥肟酸鉛(Pb-BHA)配合物捕收劑體系下對白鎢礦與方解石選擇性抑制作用機(jī)理。單礦物浮選實驗結(jié)果表明，Al-Na2SiO3可以實現(xiàn)白鎢礦與方解石的高效浮選分離。紅外光譜和溶液化學(xué)分析表明，Al3+與硅酸通過化學(xué)成鍵作用生成具有Si—O—Al 鍵的鋁硅聚合物。動電位測試、X射線光電子能譜(XPS)測試等分析表明，Al-Na2SiO3在白鎢礦及方解石表面均發(fā)生化學(xué)吸附，Al-Na2SiO3中的氧原子和礦物表面的鈣質(zhì)點(diǎn)為吸附反應(yīng)的活性位點(diǎn)。相比于Na2SiO3，Al-Na2SiO3在白鎢礦表面吸附量較少，其化學(xué)吸附作用相對較弱，而在方解石的表面吸附量較大，化學(xué)吸附作用較強(qiáng)。Al-Na2SiO3聚合物和Pb-BHA配合物選擇性的協(xié)同作用實現(xiàn)了白鎢礦與方解石的高效浮選分離。
關(guān)鍵字: Al-Na2SiO3聚合物抑制劑；Pb-BHA配合物捕收劑；白鎢礦；浮選；硅酸鈉
（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;
3. Ninghua Xingluokeng Tungsten Mining Co., Ltd., Ninghua 365400, China）
Abstract:The mechanism of selective inhibition of scheelite and calcite using Pb-BHA complexes and Al-Na2SiO3polymer self-assembled by Al3+ and colloidal silicic acid as collector and depressant was studied. The flotation results indicate that the separation of scheelite from calcite can be realized by Al-Na2SiO3. The infrared spectroscopy and solution chemical analysis results show that Al3+ and silicate acid form aluminosilicate polymer with Si—O—Al bond via chemical bonding. Zeta potential and XPS analysis results show that calcium cations of scheelite and calcite surfaces could bond to oxygen atoms of Al-Na2SiO3 through chemisorption, the calcium cations and oxygen atoms are the active site of the adsorption reaction. Compared with Na2SiO3, Al-Na2SiO3 shows less adsorption amount and weaker chemisorption on the scheelite surface, while the reverse is true on the calcite surface. The selective separation of scheelite from calcite is attributed to the cooperative selectivity of the Pb-BHA complexes and Al-Na2SiO3 polymer.
Key words: Al-Na2SiO3polymer depressant; Pb-BHA complexes collector; scheelite; flotation; sodium silicate
