不同类型酸作用下构造煤表面性的变化机理
发布时间：2018-11-11 07:20
【摘要】：以沁水盆地中南部霍尔辛赫井田的不同煤体结构煤为研究对象,用盐酸(HCl)、醋酸(HAc)和氢氟酸(HF)对煤样进行酸化处理,并运用低温灰化和X射线衍射等方法,对酸改造前后煤样的质量变化率、煤-水接触角和表面张力进行测试计算分析.研究表明:盐酸和醋酸作用后煤样的质量变化率在0.1%左右,而氢氟酸作用后煤样的质量变化率却高达7%;不同酸的作用对象不同,氢氟酸可与煤中大部分无机矿物质发生反应,效果最为显著;盐酸酸化后,煤-水接触角由59.75°减小为33.25°,表面张力由54.42mJ/m~2增至66.45mJ/m~2,含水性增强;而醋酸和氢氟酸酸化后,煤-水接触角由59.75°分别增至85.00°和84.50°,表面张力由54.42 mJ/m~2分别减至39.34mJ/m~2和39.65mJ/m~2,疏水性增强;煤样经酸化处理后,煤-水接触角和表面张力变化明显.
[Abstract]:The coal with different coal structure in the central and southern part of Qinshui Basin was studied. The coal samples were acidified with (HCl), acetic acid (HAc) and hydrofluoric acid (HF), and the methods of low temperature ashing and X-ray diffraction were used. The quality change rate, coal-water contact angle and surface tension of coal samples before and after acid modification were measured and analyzed. The results show that the mass change rate of coal sample is about 0.1% after the action of hydrochloric acid and acetic acid, but the change rate of coal sample after hydrofluoric acid is as high as 7%. Hydrofluoric acid can react with most inorganic minerals in coal, and the effect is most remarkable. After hydrochloric acid acidification, the coal-water contact angle decreased from 59.75 掳to 33.25 掳, the surface tension increased from 54.42mJ/m~2 to 66.45mJ / mm2, and the water content increased. However, after acidification of acetic acid and hydrofluoric acid, the contact angle between coal and water increased from 59.75 掳to 85.00 掳and 84.50 掳, and the surface tension decreased from 54.42 mJ/m~2 to 39.34mJ/m~2 and 39.65mJ / m-2, respectively, and the hydrophobicity increased. After acidizing treatment, coal-water contact angle and surface tension change obviously.
【作者单位】： 河南理工大学能源科学与工程学院;中原经济区煤层(页岩)气协同创新中心;
【基金】：国家自然科学基金资助项目(41372162) 河南省高校科技创新团队支持计划项目(14IRTSTHN002)
【分类号】：TE377;TQ531
本文编号：2324156
[Abstract]:The coal with different coal structure in the central and southern part of Qinshui Basin was studied. The coal samples were acidified with (HCl), acetic acid (HAc) and hydrofluoric acid (HF), and the methods of low temperature ashing and X-ray diffraction were used. The quality change rate, coal-water contact angle and surface tension of coal samples before and after acid modification were measured and analyzed. The results show that the mass change rate of coal sample is about 0.1% after the action of hydrochloric acid and acetic acid, but the change rate of coal sample after hydrofluoric acid is as high as 7%. Hydrofluoric acid can react with most inorganic minerals in coal, and the effect is most remarkable. After hydrochloric acid acidification, the coal-water contact angle decreased from 59.75 掳to 33.25 掳, the surface tension increased from 54.42mJ/m~2 to 66.45mJ / mm2, and the water content increased. However, after acidification of acetic acid and hydrofluoric acid, the contact angle between coal and water increased from 59.75 掳to 85.00 掳and 84.50 掳, and the surface tension decreased from 54.42 mJ/m~2 to 39.34mJ/m~2 and 39.65mJ / m-2, respectively, and the hydrophobicity increased. After acidizing treatment, coal-water contact angle and surface tension change obviously.
【作者单位】： 河南理工大学能源科学与工程学院;中原经济区煤层(页岩)气协同创新中心;
【基金】：国家自然科学基金资助项目(41372162) 河南省高校科技创新团队支持计划项目(14IRTSTHN002)
【分类号】：TE377;TQ531
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1 闫智婕;陈学习;许鸿雁;;煤样试片制备方法对煤水接触角测定影响分析[J];华北科技学院学报;2011年02期
，本文编号：2324156
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