新疆与内地炼焦煤的差异性

Differences between Xinjiang and inland coking coals

由于新疆炼焦煤所炼制的焦炭反应性高、反应后强度低,使得丰富的新疆炼焦煤资源难以发挥成本优势。为探究新疆炼焦煤的特性,对比研究了4种典型的新疆炼焦煤和4种同牌号的内地炼焦煤,并分别进行煤质、镜质组随机反射率和红外光谱(FTIR)分析。结果表明:低煤阶新疆炼焦煤与内地炼焦煤之间没有明显的差异,然而中、高煤阶新疆炼焦煤的灰分和硫含量均低于同牌号的内地炼焦煤,故使用新疆炼焦煤炼焦有利于降低焦炭中的灰分和硫含量;同时中、高煤阶新疆炼焦煤的镜质组平均最大反射率、胶质层最大厚度和芳香缩合度均低于同牌号的内地炼焦煤,脂肪族侧链和羟基的数量均高于同牌号的内地炼焦煤,说明中、高煤阶新疆炼焦煤的变质程度低于同牌号的内地炼焦煤。

Xinjiang has abundant coking coal resource,but Xinjiang coke used by Xinjiang coking coals exhibits high reactivity and low strength after reaction.So it is difficult to translate effectively the resource advantage of Xinjiang into cost advantage.In order to obtain the specificity of Xinjiang coking coal,four typical Xinjiang coking coals and another four inland coking coals of same rank were studied by coal properties analysis,vitrinite reflectance analysis and FTIR analysis. The results show that the differences between low-rank Xinjiang coking coal and low-rank inland coking coal are not obvious.Ash and sulfur content of medium-rank Xinjiang coking coal are lower than medium-rank inland coking coal,which is benefit for decreasing ash and sulfur content of coke.Furthermore,medium-rank Xinjiang coking coal has relatively lower mean maximum vitrinite reflectance,maximum thickness of plastic layer and aromatic condensation in comparison with medium-rank inland coking coal,while the amount of branched aliphatic side-chains and hydroxyl of medium-rank Xinjiang coking coal is higher than medium-rank inland coking coal.It indicates that metamorphism degree of medium-rank Xinjiang coking coal is lower than that of medium-rank inland coking coal.The similar phenomenon is also observed in high-rank Xinjiang coking coal.