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通过分步释放试验和浮沉试验对贵州水城煤样(SC-DHB)进行洗选,得到不同的洗选产品,并进行了可选性评定.对不同产品中氟和氯的含量进行分析,研究了洗选过程中氟和氯的迁移和脱除特性.分析了贵州煤中氟和氯的赋存形态,研究了氟和氯与无机矿物质间的亲和特性,以及浮沉洗选方法对氟和氯的脱除效果,进行了可脱除性分析.结论:对于贵州煤样SC-DHB,当精煤灰分为10.0%时,可选性等级为“中等可选”;当精煤灰分为13.0%时,可选性等级为“易选”;氟主要以无机形态赋存于携氟矿物中,在洗选得到的产品中表现出良好的无机亲和特性;氯大部分以无机形态存在,小部分以有机态存在,在洗选得到的产品中亲无机特性强;氟和氯的可脱除性分析显示,理论精煤灰分为12.07%,处于“中等可选”与“易选”之间:对于氟和氯质量分数不是很高的煤,经过洗选,其氟和氯质量分数可达到较低水平.
Scrubbing of Guizhou Shuicheng coal sample (SC-DHB) was conducted by step-by-step release test and sedimentation test, and different washing products were obtained and optionally evaluated.The contents of fluorine and chlorine in different products were analyzed and studied The characteristics of fluorine and chlorine migration and removal in the process of washing were analyzed.The morphology of fluorine and chlorine in Guizhou coal was analyzed.The affinity between fluorine and chlorine and inorganic minerals was studied and the effect of floating sediment washing on fluorine And chlorine removal efficiency were analyzed.Conclusion: For the Guizhou coal sample SC-DHB, when the coal ash content is 10.0%, the optional grade is “moderately acceptable” Ash content of 13.0%, the optional level of “easy to choose ”; fluorine mainly occurs in the fluorine-bearing minerals in mineral form, in washing products obtained showed good inorganic affinity; most chlorine Inorganic form exists, a small part of the presence of organic state, washing in the product obtained pro-inorganic properties strong; fluorine and chlorine detachability analysis shows that the theory of coal ash is divided into 12.07%, in the “medium optional ”And“ easy to choose ”between: For fluorine and chlorine is not very high quality coal, after washing, the fluorine and chlorine content can be achieved more than Level.