期刊
COAL PREPARATION
卷 23, 期 3, 页码 113-127出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/07349340302260
关键词
coal flotation; reverse flotation; DTAB; humic acids; surfactant adsorption
Coal reverse flotation, a process in which coal mineral matter is floated instead of the organic matter, was studied through a series of batch flotation tests on artificial coal/silica mixtures using two coals varying in rank. Dodecyltrimethyl ammonium bromide (DTAB) was utilized as a mineral matter collector, while humic acids (sodium salt) were added as a coal depressant. It was shown that the separation of silica from coal by reverse flotation is a kinetic process in which silica floats first followed by clean coal. The selective recovery of silica was possible only in a very narrow range of DTAB dosages and the amount of DTAB needed for best selectivity was a function of coal rank. A lower rank coal required much higher amine doses than a bituminous coal (depressed with humic acids), which was attributed to the higher amine adsorption on the more hydrophilic coal.
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