CAJ | 학술논문

选取九种不同灰熔融温度的煤样,利用X射线衍射分析方法,研究了煤灰的矿物质组成及含量对灰熔融温度的影响,以及弱还原性气氛下不同温度煤灰熔融过程中的矿物演变过程及其对灰熔融温度的影响.结果表明,815 ℃煤灰的主要晶体矿物质组成为石英、硬石膏、赤铁矿、氢氧钙石和石灰等.一般情况下,煤灰中氢氧钙石含量低,硬石膏和赤铁矿含量高的煤,灰熔融温度较低.在还原性气氛下,随着温度的升高,煤灰中的石英、硬石膏、氢氧钙石等结晶矿物含量逐渐减少,生成新的矿物质.莫来石的生成是导致煤灰熔融温度高的主要原因.低灰熔融温度煤灰在加热过程中,在1 100 ℃时,钙长石和铁钙辉石的生成起到了降低煤灰熔融温度的作用.
선취구충불동회용융온도적매양,이용X사선연사분석방법,연구료매회적광물질조성급함량대회용융온도적영향,이급약환원성기분하불동온도매회용융과정중적광물연변과정급기대회용융온도적영향.결과표명,815 ℃매회적주요정체광물질조성위석영、경석고、적철광、경양개석화석회등.일반정황하,매회중경양개석함량저,경석고화적철광함량고적매,회용융온도교저.재환원성기분하,수착온도적승고,매회중적석영、경석고、경양개석등결정광물함량축점감소,생성신적광물질.막래석적생성시도치매회용융온도고적주요원인.저회용융온도매회재가열과정중,재1 100 ℃시,개장석화철개휘석적생성기도료강저매회용융온도적작용.
Nine different fusion temperature coals were selected, and the relationship between ash fusion temperature and ash mineral composition and content were studied by using XRD. The mineral transformation of typical coal ashes in reducing atmosphere was also investigayed. The results show that the mineral phases of coal ashes which are ashed at 815 ℃ mainly include quartz, anhydrite, hematite, portlandite, lime and potash feldspar. Higher anhydrite and hematite content and lower portlandite content would result in lower ash fusion temperature. As the heating temperature increases, the content of quartz, anhydrite and portlandite in coal ash decreases in reducing conditions and some new mineral phases are formed. Mullite is formed, which leads to higher ash fusion temperature. However, the formation of anorthite and hedenbergite at 1 100 ℃ in the heating process is the main reason for the ash melting temperature lowing.