微波辅助H2O2复配体系脱除煤中硫分研究

为研究微波辅助H₂O₂复配体系脱除煤中硫分的效果，选取宁夏宁东地区鸳鸯湖煤样作为研究对象。分别用柠檬酸和氢氧化钠与过氧化氢复配作用于煤样，通过微波辐照处理，微波辐照功率为900 W，辐照时间为5 min。结果表明：单独过氧化氢处理后脱硫率为34.29%，过氧化氢–柠檬酸和过氧化氢–氢氧化钠复配体系最大脱硫率分别高达43.67%和45.31%，且脱硫过程大部分硫铁矿硫被脱除，煤中硫形态逐渐向高价态转化，原煤中的噻吩被部分转化为亚砜、砜和硫酸盐硫；微波辅助复配助剂处理后可以增大煤样与助剂的接触面积，提高羟基自由基与煤中含硫基团接触的可能性，从而提高脱硫率。

Removal of sulfur from coal by microwave-assisted H2O2 compound system

To study the effect of removing sulfur from coal by microwave-assisted H₂O₂ compound system, coal samples from Yuanyang Lake in Ningdong, Ningxia were selected as the research object. The coal samples were treated with citric acid, sodium hydroxide and hydrogen peroxide, respectively. The microwave irradiation power was 900 W, and the irradiation time was 5 min. The results show that the desulfurization rate treated by hydrogen peroxide alone is 34.29%. The maximum desulphurization rates for two compound systems of the hydrogen peroxide with citric acid, and hydrogen peroxide with sodium hydroxide compound system are as high as 43.67% and 45.31% respectively. During the desulfurization process, most pyrite sulfur is removed. Sulfur forms in coal are changed into high state gradually, and in particular, thiophene is partially changed into sulfoxide, sulfone and sulfate sulfur. Microwave assisted compound agent treatment can be used to increase the contact area between the coal sample and the compound agent. The possibility of contact between hydroxyl radical and sulphur-containing groups in the coal is increased, so as to improve the desulfurization rate.