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| Mineral distribution of industry blended coal powder |
| HAO Juan, ZHANG Hong, CHEN Jia-bao, LI Ya-nan |
| School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China |
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Abstract The industry blended coal powders were sampled from Guangxi Huahong (HH), Guangxi Huarun (HR), Jiangxi Wannianqing (WNQ), Shanxi Weidun (WD) and Wuhu Digang (DG) new dry cement plants. The distribution rule of minerals in blended coal powders was analyzed with the methods of proximate analysis, float-sink, laser particle size analyzer and petrographic analysis. Results showed that the ash of all of the coal samples decreased with the increase of the particle size. The separation of coal and minerals was obvious in the blended powders, among which HH, HR, WNQ and DG coal samples showed the better grade effect, and WD coal sample was poor effect. In all coal samples higher density fractions decreased with the increase of the particle size, the content of external mineral decreased with increasing particle size, and the change of ash with particle size was mainly controlled by the mass fraction of higher density fraction. In the range of test density fraction and size fraction, the yield of fines was higher in the high density and fine size fractions of HH, HR, WNQ and WD coal samples, while the fines yield was higher in the low density fraction of DG coal samples.
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Published: 17 May 2012
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工业混煤煤粉中矿物质分布规律
采集广西华宏（HH）、广西华润（HR）、江西万年青（WNQ）、山西威顿（WD）和安徽狄港（DG）5个新型干法水泥厂的工业混煤煤粉样品,通过工业分析、浮沉试验、粒度分析和煤岩成分分析,研究工业混煤煤粉中矿物质的分布规律.研究发现,各工业混煤煤粉样品都呈现出随着煤粉粒度增加灰质量分数降低的规律,其中HH、HR、WNQ和DG煤粉中煤和矿物质分化程度较高,WD混煤煤粉的分化程度较差.煤粉样品中整体呈现出高密度级煤样产率随着粒度增大而逐渐降低的趋势,随着粒度增加外在矿物逐渐减少,灰质量分数随粒度的变化主要是由高密度级煤样质量分数变化引起的.在测定的密度和粒度范围内,HH、HR、WNQ和WD煤粉的产率主要集中在高密度细粒级,而DG煤样低密度级的产率较高.
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