Song Dangyu, Wang Mingshi, Zhang Junying, Zheng Chuguang
Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo, China.
Ann N Y Acad Sci. 2008 Oct;1140:274-81. doi: 10.1196/annals.1454.009.
Eleven raw coal samples were collected from Liuzhi, Suicheng, Zunyi, Xingren, Xingyi, and Anlong districts in Guizhou Province, Southwest China. The content of cadmium (Cd) in coal was determined using inductively coupled plasma mass-spectrometry (ICP-MS). Cd contents ranged from 0.146 to 2.74 ppm (whole coal basis), with an average of 1.09 ppm. In comparison with the arithmetic means of Cd in Chinese coal (0.25 ppm), this is much higher. In order to find its occurrence in coal, float-sink analysis and a coal flotation test by progressive release were conducted on two raw coal samples. The content of the Cd and ash yield of the flotation products were determined. The organic matter was removed by low-temperature ashing (LTA). X-ray diffraction (XRD) was used to differentiate the main, minor, and trace minerals in the LTA from different flotation subproducts. Quartz, kaolinite, pyrite, and calcite were found to dominate the mineral matters, with a proportion of anatase, muscovite, and illite. Then quantitative analysis of minerals in LTA was conducted using material analysis using diffraction (MAUD) based on the Rietveld refinement method. Results show that Cd has a strong association with kaolinite.
从中国西南部贵州省的六枝、水城、遵义、兴仁、兴义及安龙地区采集了11个原煤样本。采用电感耦合等离子体质谱法（ICP-MS）测定煤中镉（Cd）的含量。Cd含量范围为0.146至2.74 ppm（基于全煤），平均为1.09 ppm。与中国煤中Cd的算术平均值（0.25 ppm）相比，该含量要高得多。为了查明其在煤中的赋存状态，对两个原煤样本进行了浮沉分析和逐级释放煤浮选试验。测定了浮选产品的Cd含量和灰分产率。通过低温灰化（LTA）去除有机质。利用X射线衍射（XRD）区分不同浮选子产品低温灰化物中的主要、次要和痕量矿物。发现石英、高岭石、黄铁矿和方解石在矿物中占主导地位，还有一定比例的锐钛矿、白云母和伊利石。然后基于Rietveld精修法，采用衍射物质分析（MAUD）对低温灰化物中的矿物进行定量分析。结果表明，Cd与高岭石有很强的关联。
