Study on Catalytic Oxidation of Coal-based Fischer-Tropsch Synthetic Oil and Flotation Mechanism with Lean Coal
In order to improve the added value of coal-based Fischer-Tropsch synthetic oil(CBFTSO)and broaden its application field,the modification study of CBFTSO was carried out by catalytic oxidation method with manganese naphthenate as catalyst.On this basis,the flotation feed of a coal washing plant in Shanxi Province was taken as the research object,and the suitable oxidation reaction conditions were determined by flotation test.The interaction mechanism between OCBFTSO(the product under the optimal oxidation condition)and coal was revealed by gas chromatography-mass spectrometry(GC-MS),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and contact angle test.The results show that the optimum oxidation conditions of CBFTSO are oxidation temperature 120℃,catalyst concentration 0.1%and oxi-dation time 12 h.When the dosage of OCBFTSO and foaming agent(fusel)is 50 g/t,the separation index of concentrated coal yield 86.59%and concentrated coal ash 8.64%can be obtained.Compared with CBFTSO as collector,the concentrated coal yield is increased by about 2 percentage points,and the concentrated coal ash is reduced by about 1 percentage point.The mechanism analysis results show that the n-decane and 4-azidoheptane in CBFTSO make the polar group(ketone group)ap-pear in OCBFTSO through reaction(chain initiation,etc),which will combine with the C—O and O—C=O groups on the coal surface to improve the hydrophobicity of the coal surface.The use of OCBFTSO reduces the content of kaolinite and quartz in concentrated coal,so it has good flotation selectivity.
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