Flotation separation of calcareous minerals using didodecyldimethylammonium chloride as a collector  

作　　者：Zhang Ying Wang Yuhua Li Shiliang 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]Beijing General Research Institute of Mining&Metallurgy,Beijing 100070,China

出　　处：《International Journal of Mining Science and Technology》2012年第2期285-288,共4页矿业科学技术学报（英文版）

基　　金：supported by the State Key Program of National Natural Science Foundation of China (No. 50834006)

摘　　要：The flotation separation of scheelite from fluorite and calcite using dodecyltrimethylammonium chloride （DTAC）, dodecyldimethylbenzylammonium chloride （DDBAC）, or didodecyldimethylammonium chloride （DDDAC） as the collector has been investigated. The results show that the selectivity of these collectors for these three calcareous minerals falls in the order： DDDAC 〉 DDBAC 〉 DTAC. A significantly different flotation response of scheelite compared to the other two calcareous minerals was observed over the pH range from 7 to 8 for DDDAC as the collector. A concentrate containing 41.40% W03 could be produced from a feed mixture containing 23.22% WO3 at the DDDAC concentration of 4.0× 10^-4 mol/L. The WO3 recovery was 92.92% under these conditions. The results of zeta potential measurements suggest that electrostatic interactions are the main forces between DDDAC and the minerals. When the concentration of DDDAC is from 2× 10^-4 to 4×10-3 mol/L large differences in adsorption density, and adsorption kinetics, of DDDAC onto scheelite, calcite, and fluorite provide desirable conditions for achieving high selectivity.The flotation separation of scheelite from fluorite and calcite using dodecyltrimethylammonium chloride(DTAC),dodecyldimethylbenzylammonium chloride(DDBAC),or didodecyldimethylammonium chloride(DDDAC) as the collector has been investigated.The results show that the selectivity of these collectors for these three calcareous minerals falls in the order:DDDAC > DDBAC > DTAC.A significantly different flotation response of scheelite compared to the other two calcareous minerals was observed over the pH range from 7 to 8 for DDDAC as the collector.A concentrate containing 41.40% WO3 could be produced from a feed mixture containing 23.22% WO3 at the DDDAC concentration of 4.0 10à4 mol/L.The WO3 recovery was 92.92% under these conditions.The results of zeta potential measurements suggest that electrostatic interactions are the main forces between DDDAC and the minerals.When the concentration of DDDAC is from 2 10à4 to 4 10à3 mol/L large differences in adsorption density,and adsorption kinetics,of DDDAC onto scheelite,calcite,and fluorite provide desirable conditions for achieving high selectivity.

关 键 词：ScheeliteCalciteFluoriteFlotationQuaternary ammonium salt 

分 类 号：TQ423.12[化学工程] TD952[矿业工程—选矿]