助熔剂对煤灰熔融过程中矿物行为的影响

针对淮南矿区高灰熔融性煤难以直接用于现有液态排渣煤气化工艺的问题,利用智能灰熔点测定仪和X-射线衍射仪(XRD)在弱还原性气氛下,分别对淮南矿区煤样以及添加助熔剂后灰熔融温度和煤灰矿物行为进行了研究.结果表明,随着灰化温度的升高,高岭石转变为莫来石;碳酸盐矿物逐渐分解.助熔剂ADF和ADC在不同的温度下,容易与煤灰中其他矿物形成硬石膏、赤铁矿、铁尖晶石、铁橄榄石和钙长石等助熔矿物,从而降低煤灰熔融温度.

EFFECT OF FLUXES ON THE ASH BEHAVIOR OF COAL

According to the high ash fusibility coal from Huainan Mining Areas was hard directly to apply to the available liquefaction technique with the liquid coal ash discharging,under the weak reduction air,the intelligent ash fusion detector and X-ray diffractometer were applied to study the ash fusion characteristics temperature and mineral behavior of typical coal samples with base flux.It is shown that,as the ashing temperature go up,the mullite derived from kaolinite was formed,the transimittance of carbonate decrease gradually.Fluxes of ADC and ADF which react with other minerals in coal ash to form fayalite,hereynite,gehlenite,anhydrite at high temperature can lower the ash fusion temperature effectively.