Liu Kaicheng, Yang Ji, Jia Jinping, Wang Yaling
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, PR China.
Chemosphere. 2008 Mar;71(1):183-8. doi: 10.1016/j.chemosphere.2007.10.005. Epub 2007 Nov 19.
Different from other options which usually required strict conditions, a method combining atmospheric oxidization and chemical cleaning with alkali solutions was employed to desulphur coals at temperature around 90 degrees C. The data show that 66% organic sulphur, 44% sulphide sulphur, and 15% pyrite sulphur were lost when the coal was treated in 0.25M NaOH at 90 degrees C, while the solution being aerated at the flow rate of 0.136m3h(-1). The rate increased to 73% for organic sulphur, 83% for sulphide sulphur and 84% for pyrite sulphur when the previous coal was further treated in acidic solution containing HCl at pH 1 for another hour. The mechanism of desulphurization was explored using inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy and infrared. It was found out that the bond of -CS was broken by atmospheric oxygen in basic environment, leading to the lost of organic sulphur in coal. Scanning electron microscope data show that the physical structure of the coal was not adversely affected by the treatment and thermogravimetric analysis results prove that the pyrolysis behavior remained unchanged, indicating that the burning process of the coal would not be adversely affected. Unlike other oxidizing methods, this technique does not lower the heating value of the coal which was manifested by relevant data.
与通常需要严格条件的其他方法不同，采用了一种将大气氧化和用碱性溶液进行化学清洗相结合的方法，在约90摄氏度的温度下对煤进行脱硫。数据表明，当煤在90摄氏度下于0.25M氢氧化钠溶液中处理，同时溶液以0.136立方米每小时（-1）的流速曝气时，66%的有机硫、44%的硫化物硫和15%的黄铁矿硫被去除。当先前处理过的煤在pH值为1的含盐酸酸性溶液中再处理一小时后，有机硫的去除率提高到73%，硫化物硫的去除率提高到83%，黄铁矿硫的去除率提高到84%。使用电感耦合等离子体质谱、X射线光电子能谱和红外光谱对脱硫机理进行了探索。结果发现，在碱性环境中，-CS键被大气中的氧气破坏，导致煤中有机硫的去除。扫描电子显微镜数据表明，煤的物理结构未受到该处理的不利影响，热重分析结果证明热解行为保持不变，这表明煤的燃烧过程不会受到不利影响。与其他氧化方法不同，该技术不会降低煤的热值，相关数据证明了这一点。
