煤矸石元素分析与热解过程研究

Analysis and Pyrolysis of Coal Gangue in Xi Ming Mine

以山西省西铭矿煤矸石为研究对象,对其进行工业分析和全元素分析,得出其化学组分;用X光衍射仪对其进行XRD图谱分析,得出其主要物相为高岭石和SiO2;利用热重法,研究了不同热解温度、样品粒径、升温速率下的热解过程,得出TG曲线图,结果表明:(1)温度对影响煤矸石热解反应很大,随着温度的升高,其热解产物量不断增大,500℃左右时热解反应最激烈,在600℃左右达到热解产物量最大值,800℃后,热解产物量基本趋于平缓;(2)粒度越小,热解反应越充分,热解产物越大。(3)升温速率对热解有较大影响,热解的终温越大,煤矸石的热解产物量增大;升温速率增加,会产生热滞后现象,热解反应区间向高温区移动。

The research object is the coal gangue of Ximing mine in the Xishan mining area, which is analyzed by the whole industry analysis The element analysis, The chemical components were obtained, by X ray diffraction analyzed the chemical composition of XRD, the main hase is Kaolinite and SiO2. Using thermo gravimetric method, different pyrolysis temperature, particle size the heating rate, pyrolysis process, and get the TG curve was studied, the results show that:(1) the temperature has great influence on coal pyrolysis reaction, with the increase of temperature,the pyrolysis product quantity is increasing, when it is 500 degrees centigrade the pyrolysis reaction is the most intense, about 600 degrees centigrade the pyrolysis product quantity reached the maximum, the pyrolysis product quantity tends to be smooth after 800 degrees centigrade;(2) the smaller the particle size, the pyrolysis reaction more fully, the greater the pyrolysis product quantity;(3)heating rate has a great effect on pyrolysis, the greater the final temperature of pyrolysis, the greater the pyrolysis product quantity;the heating rate increasing, resulting in thermal hysteresis.