摘要:
为了增强浮选中煤表面的疏水性同时将废油脂“变废为宝”,采用废油脂与甲醇、乙醇催化反应,通过不同反应时间制备出系列生物捕收剂(Bio-flotation collector,简称BFC).BFC样品中的主要组分由气质联用(GC-MS)分析、采用红外光谱(FT-IR)表征了BFC中有机官能团,同时BFC样品的组分含量由气相色谱检测,BFC的捕收效果采用屯兰2#煤的单元浮选试验考察.结果显示:BFC分子结构中主要含有甲酯、乙酯,而且还含羟基、酯基(其可形成氢键)、脂肪酸.在浮选试验中,BFC表现出了良好的捕收性能,其捕收选择性高,可使精煤灰分降到9.27%,而尾煤灰分高达76.37%.而且BFC具有耗量低的特点,在与煤油相同Ee的情况下,BFC用量低至0.75 kg/t,低于煤油31.8%.
Abstract:
A series of bio-flotation collectors(BFC) were prepared through catalytic reaction between waste oils and fats and methanol as well as ethanol by adjusting the reaction time in order to improve the hydrophobicity of coal surface in flotation and turn waste into wealth.The GC-MS and FT-IR,Gas Chromatography were respectively completed in order to analyze the main components of BFC,characterize the organic groups of BFC and measure the component contents of BFC.And then the contrastive flotation experiments between BFC and kerosine were done using coal sample of Tunlan 2#.The results showed that the main molecular structures of BFC contains not only methyl ester and ethyl ester,but also hydroxyl and ester group that can form hydrogen bonding groups as well as fatty acid.From the results of flotation that the ash of clean coal was as low as 9.27% and the tailing ash was up to 76.37%,it can be drawn a conclusion that BFC had better collecting effect and higher collecting selectivity than kerosine.The collector consumption of BFC was low 0.75 kg/t,less 31.8 % than that of kerosine under the condition of similar flotation effect.
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