Flotation performance of a novel Gemini collector for kaolinite at low temperature  

作　　者：Shiyong Zhang Zhiqiang Huang Hongling Wang Rukuan Liu Chen Cheng Shuyi Shuai Yajing Hu Zhiqun Guo Xinyang Yu Guichun He Weng Fu 

机构地区：[1]School of Resource and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 34100,China [2]Guangdong Institute of Resources Comprehensive Utilization,Guangzhou 510650,China [3]Hunan Academy of Forestry,Changsha 410004,China [4]School of Chemical Engineering,The University of Queensland,Brisbane 4072,Australia

出　　处：《International Journal of Mining Science and Technology》2021年第6期1145-1152,共8页矿业科学技术学报（英文版）

基　　金：the support of the National Natural Science Foundation of China (No. U1607108);Natural Science Foundation of Jiangxi, China (No. 20202ACBL213008)。

摘　　要：How to sustainably produce bauxite by effective reverse froth flotation of kaolinite at low temperature is an urgent problem to be solved in the field of mineral processing.In this work,a novel amino-based Gemini surfactant butadiyl-1,4-bis(dimethyl dodecylammonium bromide)(BBDB) was prepared and first utilized as a novel collector for kaolinite flotation.Its flotation performance for kaolinite was compared with that of the common monomolecular surfactant 1-dodecylamine(DDA) by micro-flotation tests.The tests results indicated that 95% kaolinite recovery was obtained using 2.0×10^(-4) mol/L BBDB at 25℃ which was half of the dosage when DDA obtained the maximum kaolinite recovery of81%.At extremely low temperature(0℃),3.0×10^(-4) mol/L BBDB could still collect 91% kaolinite,while DDA showed a frustrating ability.The contact angle tests indicated that BBDB could still significantly improve the hydrophobicity of the kaolinite surface(contact angle 71.7°) than DDA(contact angle only25.8°) at 0℃.The Krafft point comparison tests indicated that BBDB had a much lower Krafft point(below0℃) than DDA.Fourier transform infrared spectroscopy(FTIR)-spectrum analysis and zeta potential measurements showed that BBDB was physically adsorbed on the surface of kaolinite through electrostatic interaction.

关 键 词：KAOLINITE BAUXITE Gemini surfactant Flotation collector Low temperature 

分 类 号：TD97[矿业工程—选矿] TD923