磷酸对过氧化氢氧化脱除高硫煤泥中硫的影响

doi:10.19286/j.cnki.cci.2022.09.040

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摘要

为了提高H2O2对煤中硫的脱除效果，采用无机酸辅助H2O2氧化法脱除山西某高硫泥煤中的硫，研究了酸种类及H3PO4浓度对脱硫率的影响，并采用红外光谱、X射线衍射、扫描电子显微镜对氧化前后的煤样进行分析表征。结果表明：酸能提高H2O2氧化脱硫效果，其中H3PO4的强化效果最优，H2SO4次之，HCl和HNO3的效果不明显。当H3PO4浓度为0.05 mol/L、20% H2O2液固比为10∶1、反应2 h时，与纯H2O2氧化相比，总硫和有机硫的脱除率分别提高了约25.8%和107.1%。这是由于H3PO4能与Fe2+、Fe3+络合反应生成Fe2(PO4)3、FePO4沉淀，促进了H2O2与FeS2氧化，加快了矿物的溶解，减少了传质阻力。但H3PO4的浓度过高时，脱硫率反而下降。

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	李钰涵
	孙奥
	刁忠秀
	魏凤玉

关键词 ：过氧化氢, 煤氧化脱硫, 磷酸, 协同作用

Abstract：

In order to improve the removal effect of H2O2 on sulfur in coal, inorganic acid assisted H2O2 oxidation method was used to remove sulfur from a high sulfur peat in Shanxi Province, the effects of acid types and H3PO4 concentration on desulfurization rate was studied, and the coal samples before and after oxidation were analyzed and characterized by infrared spectroscopy, X-ray diffraction and scanning electron microscope. The results show that acid can improve the oxidative and desulfurization effect of H2O2, among which the strengthening effect of H3PO4 is the best, followed by H2SO4, and the effect of HCl and HNO3 are not obvious. When the concentration of H3PO4 was 0.05 mol/L, the liquid-solid ratio of 20% H2O2 was 10∶1, and reaction time was 2 h, compared with pure H2O2 oxidation , the removal rates of total sulfur and organic sulfur were increased by about 25.8% and 107.1%, respectively. This is because H3PO4 can complexate with Fe2+ and Fe3+ to generate Fe2(PO4)3 and FePO4 precipitation, which the oxidation of H2O2 and FeS2 is promoted, the dissolution of minerals is accelerated, and the mass transfer resistance is reduced. However, when the concentration of H3PO4 is too high, the desulfurization rate decreases instead.

Key words： hydrogen peroxide coal oxidation desulfurization phosphoric acid synergistic effect

通讯作者: 魏凤玉（ 1963— ），女，江苏靖江人，教授。

作者简介: 李钰涵（ 1998— ），女，安徽蚌埠人，在校硕士。

引用本文:

李钰涵，孙奥，刁忠秀，魏凤玉. 磷酸对过氧化氢氧化脱除高硫煤泥中硫的影响[J]. 煤炭与化工, 2022, 45(9): 151-155. Li Yuhan, Sun Ao, Diao Zhongxiu, Wei Fengyu. Effect of phosphoric acid on oxidative removal of sulfur from high sulfur coal slime by hydrogen peroxide. CCI, 2022, 45(9): 151-155.

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http://www.mtyhg.com.cn/CN/10.19286/j.cnki.cci.2022.09.040 或 http://www.mtyhg.com.cn/CN/Y2022/V45/I9/151

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