Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Flotation techniques for separation of diaspore from bauxite using
Gemini collector and starch depressant
XIA Liu-yin(夏柳荫), ZHONG Hong(钟 宏), LIU Guang-yi(刘广义)

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:The floatability of diaspore and three kinds of silicate minerals, including kaolinite, illite and pyrophyllite, by a cationic Gemini surfactant as collector and starch as depressant was investigated as function of reagents concentration and pulp pH. Further studies of artificially mixed minerals and bauxite ore were also detailedly conducted. At last, the pre-desliming reverse flotation separation process was adopted. It can be concluded that the combinational use of a Gemini cationic collector and the starch depressant is effective. The concentrates with Al2O3 to SiO2 mass ratio of 9.66 and the recovery of Al2O3 of 71.73% are obtained from natural bauxite ore (A/S=5.70) at pH value of around 10.


Key words: diaspore; bauxite; reverse flotation; Gemini surfactant

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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