矿产保护与利用2025，Vol.45Issue(5)：65-72,8.DOI:10.13779/j.cnki.issn1001-0076.2025.05.005
煤炭地下气化过程中固相污染物析出规律研究
Study on the Precipitation Pattern of Solid Phase Pollutants during Underground Coal Gasification
摘要
Abstract
During Underground Coal Gasification(UCG),the composition and evolution of solid-phase pollutants in the target coal seam area-comprising the dry distillation-drying zone and the reduction zone-significantly influence environmental outcomes.In this study,a tube furnace was used to simulate the reaction conditions in these zones,and comparative pyrolysis-reduction experiments were conducted.X-ray diffraction(XRD)was systematically applied to investigate mineral phase transformations and the occurrence forms of heavy metals in solid pollutants.The main findings are as follows:(1)In the dry distillation-drying zone,solid pollutants are dominated by kaolinite,quartz,and amorphous carbon.Elevated temperatures(above 500℃)promote the dehydroxylation of kaolinite,converting it into amorphous aluminosilicates,while heavy metals such as lead(Pb)and manganese(Mn)remain primarily in oxide forms.(2)In the reduction zone,the presence of wüstite(FeO),metallic lead(Pb0),and lead sulfide(PbS)indicates a strongly reducing environment that facilitates the reduction and sulfidation of heavy metals.(3)Pyrolysis temperature critically affects the mobility of heavy metals:Pb exists mainly as PbS at low temperatures(300℃),whereas the crystallinity of metallic Pb0 increases significantly at 700℃.Moreover,manganese(Mn)and copper(Cu)exhibit higher mobility during pyrolysis,while zinc(Zn)and cadmium(Cd)show lower mobility.By elucidating mineral transformation pathways and heavy metal immobilization mechanisms through XRD,this study provides a scientific basis for predicting pollutant behavior and developing in situ mineral carbonation sequestration strategies for UCG.关键词
煤炭地下气化/固相污染物/X射线衍射(XRD)/重金属赋存形态Key words
underground coal gasification/solid phase pollutants/X-ray diffraction(XRD)/heavy metal occurrence forms分类
矿山工程引用本文复制引用
辛林,刁垌彤,杨敏,张付强,王若男,牛茂斐,王博伟..煤炭地下气化过程中固相污染物析出规律研究[J].矿产保护与利用,2025,45(5):65-72,8.基金项目
国家自然科学基金项目(52374211,52304190,52304060) （52374211,52304190,52304060）
山东省泰山学者青年专家项目(TSQN2025071830) （TSQN2025071830）
山东省自然科学基金项目(ZR2024QE029,ZR2023QE117) （ZR2024QE029,ZR2023QE117）
