Fe_2(SO_4)_3氧化脱除煤中无机硫的研究

Removal of Inorganic Sulfur from Coal by Fe_2(SO_4)_3 Oxidation Method

以3种高硫煤为对象,考察了反应温度、反应时间、Fe2(SO4)3溶液浓度和原煤粒度等因素对Fe2(SO4)3溶液热处理脱硫效果的影响,并对脱硫前后原煤理化性质的变化进行了研究。结果表明:在Fe2(SO4)3溶液浓度为1mol/L,反应温度为90℃,反应时间为4h,煤粒度小于0.096mm的条件下,原煤中黄铁矿硫的脱除率高达67%,而煤中的有机硫含量并无明显的变化;升高反应温度,增加Fe2(SO4)3溶液浓度,延长反应时间以及减小原煤粒径均可在一定程度上提高原煤的黄铁矿硫和全硫的脱硫率;经Fe2(SO4)3溶液处理后原煤的黏结性均出现了不同程度的下降,其中新峪煤完全失去了黏结性;Fe2(SO4)3溶液脱除原煤中无机硫主要是通过Fe3+的强氧化性将黄铁矿硫氧化为SO2-4进而脱除。

Effects of reaction temperature, processing time, Fe2（SO4）3 concentration and the particle size of coal on desulfurization of three kinds of high-sulfur coals through heat treatment of Fe2 （SO4）3 solution were investigated. The change of coal physicochemical property before and after the treatment was studied. The results showed that the highest removal of pyrite sulfur reached 67% while no significant change in the organic sulfur was observed when the concentration of Fe2（SO4）3 was 1 mol/L, the reaction temperature was 90 ℃, and the particle size of coal was less than 0. 096 mm. The removal rate of total sulfur and pyritic sulfur increased upon increasing the reaction temperature, the concentration of Fe2（SO4）3, and the reaction time but decreasing the particle size of coal. The caking index of coal decreased at different degrees after the treatment, especially for Xinyu coal who lost the caking property totally. The inorganic sulfur was oxided into SO4^2- and removed due to the strong oxidability of Fe3＋.