Mineral matter in coals and their reactions during coking
Mineral matter in coals and their reactions during coking
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DOI：
10.1016/j.coal.2008.08.013
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发表时间：
2008-12-01
影响因子：
5.6
通讯作者：
Sahajwalla, Veena
中科院分区：
文献类型：
--
作者：
Grigore, Mihaela;Sakurovs, Richard;Sahajwalla, Veena
焦炭在高炉中的降解受其固有矿物质的影响，矿物质的形成本身取决于煤矿物质的性质。迄今为止，对焦炭矿物学及其与母煤矿物学关系的研究很少。在这项研究中，碳化对煤矿物质的影响进行了详细的定量矿物学检查的九个焦炭及其母煤。使用SIROQUANT（TM）焦炭矿物学，对焦炭和煤的矿物质的X射线衍射图案进行定量分析，焦炭之间其组成变化很大，比灰分的元素组成变化更大。研究焦炭中的矿物质由结晶矿物质相和显著水平的非晶相（范围在44%和75%之间）组成。高岭石、蒙脱石、伊利石和高岭石等粘土的分解产生了无定形相和一些结晶矿物相，如莫来石、γ-氧化铝、尖晶石、方石英和白榴石。煤中矿物质的组合类型对粘土的分解起着重要作用。例如，高岭石与含硅矿物的紧密混合物有利于形成莫来石，而不是γ-氧化铝。高岭石和透辉石是高岭石与伴生的含钙矿物（方解石、白云石或铁白云石）反应生成的。石英，氟磷灰石和三种多晶型的二氧化钛（云母，板钛矿和金红石）是在碳化过程中受影响最小的煤矿物，因为它们也存在于焦炭中，但即使是它们在某些情况下也会受到影响。皇冠版权所有（c）2008年出版的爱思唯尔B. V.保留所有权利。
Degradation of coke in the blast furnace is influenced by its inherent mineral matter, the formation of which is itself dependent upon the nature of the coal mineral matter. To date few studies have been made of coke mineralogy and its relationship to the mineralogy of the parent coal. In this study the effect of carbonisation on coal mineral matter has been investigated by a detailed quantitative mineralogical examination of nine cokes and their parent coals. The quantitative analysis was performed on X-ray diffraction patterns of the mineral matter of cokes and coals, using SIROQUANT (TM) Coke mineralogy and its composition varied strongly between cokes, more strongly than variations in elemental composition of the ash. The mineral matter in the studied cokes consisted of crystalline mineral phases and also significant levels of amorphous phase (ranging between 44 and 75%). Decomposition of clays such as kaolinite, montmorillonite, illite and chamosite produced the amorphous phase and some of the crystalline mineral phases such as mullite, gamma-alumina, spinel, cristobalite and leucite. The type of association of mineral matter in coals had an important role in how the clays decomposed. For example, association of kaolinite with silica-bearing minerals in intimate intermixture favoured formation of mullite over gamma-alumina. Alkermanite and diopside result from reaction of kaolinite with associated calcium bearing minerals (calcite, dolomite or ankerite). Quartz, fluorapatite and the three polymorphs of TiO2 (anatase, brookite and rutile) were the coal minerals that were least affected during carbonisation, as they were also found in the cokes, yet even they were affected in some cases. Crown Copyright (c) 2008 Published by Elsevier B.V. All rights reserved.