Application of EDTMPS as a novel calcite depressant in scheelite flotation  

作　　者：Fen Jiao Wei Li Xu Wang Congren Yang Zhengquan Zhang Liwen Fu Wenqing Qin 

机构地区：[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

出　　处：《International Journal of Mining Science and Technology》2023年第5期639-647,共9页矿业科学技术学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51604302 and 51574282);the Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources(No.2018TP1002).

摘　　要：In this study, the innovative use of ethylenediamine tetramethylene phosphonic sodium(EDTMPS) as a calcite depressant in scheelite flotation was investigated by flotation experiments, and its selective depression mechanism was revealed by contact angle measurement, FTIR analysis, Zeta potential test and XPS analysis. The flotation experiment results showed that scheelite and calcite could be efficiently separated under the following conditions: pulp p H=9.5, Na OL concentration of 1.5×10^(-4)mol/L, EDTMPS concentration of 3.0×10^(-5)mol/L, a scheelite concentrate with WO3grade of 65.49%, recovery of 83.29%and separation efficiency of 65.29% could be obtained from the artificially mixed minerals. The analysis results of mineral surface properties demonstrated that EDTMPS was strongly adsorbed onto the calcite surface through the reaction between the phosphonate group and the calcium ions, which hindered Na OL adsorption and increased the hydrophilicity of calcite. However, EDTMPS had weak adsorption strength on the scheelite surface, which didn’t affect further adsorption of Na OL, hence, the scheelite remained hydrophobic. Consequently, the selective adsorption of EDTMPS on the two minerals’ surfaces increased a difference in wettability and thus enabling them to be separated by flotation. Finally, the mechanism model of this flotation separation process was established.

关 键 词：Ethylenediamine tetramethylene phosphonic sodium SCHEELITE CALCITE FLOTATION Selective depression 

分 类 号：TD954[矿业工程—选矿] TD923