Influence of Two Kinds of Red Mud on the Melting Temperature of Coal Ash in Ningxia
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摘要:
这是一篇冶金工程领域的论文。在宁夏煤中按照一定比例分别添加拜耳赤泥和烧结赤泥，研究这两种不同的赤泥对宁夏煤灰熔融温度的影响，采用Factsage软件研究了灰熔融温度改变机理。实验结果表明，宁夏煤灰矿物质中含有大量的莫来石，导致其煤灰的灰熔点较高，向其中加入赤泥能够有效地降低煤灰熔点。随着拜耳赤泥添加量的增加，煤灰中的莫来石的成分逐步减少，而钙长石与钠长石逐步增多，降低了煤灰的熔融温度。随烧结赤泥添加量的增加煤灰中莫来石的含量逐渐减少，长石的含量逐渐增多。赤泥使宁夏煤灰熔融温度降低的主要原因是由于赤泥中的碱性氧化物与煤灰中的酸性氧化物发生反应生成了低熔点的矿物质以及这些矿物质之间相互作用生成了低温共熔物。
Abstract:This is an essay in the field of metallurgical engineering. Bayer red mud and sintered red mud were added to Ningxia coal in a certain proportion to study the influence of the two different red mud on the ash melting temperature of Ningxia coal. Factsage software was used to study the ash melting temperature change mechanism. The experimental results show that Ningxia coal ash contains a large amount of mullite, which causes the ash melting point of coal ash to be higher, and adding red mud to it can effectively reduce the melting point of coal ash. With the increase in the amount of Bayer red mud added, the composition of mullite in coal ash gradually decreases, while anorthite and albite gradually increase, reducing the melting temperature of coal ash. With the increase of sintered red mud addition, the content of mullite in coal ash gradually decreases, and the content of feldspar gradually increases. The main reason that red mud reduces the melting temperature of coal ash in Ningxia is that the alkaline oxides in the red mud react with the acidic oxides in the coal ash to form low-melting minerals and the interaction between these minerals generates low temperature. Communion.
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Key words:
- Metallurgical engineering /
- Red mud /
- Ash melting temperature /
- Ningxia /
- Coal ash /
- Low-temperature eutectic
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表 1 宁夏煤灰及赤泥成分分析/%
Table 1. Compositional analysis of coal ash and red mud in Ningxia
成分 SiO2 Al2O3 Fe2O3 CaO MgO K2O Na2O SO2 TiO2 P2O5 宁夏煤灰 47.43 37.69 3.19 2.74 0.28 0.27 0.30 0.79 1.17 0.14 拜耳赤泥 33.29 27.74 8.89 15.40 0.64 0.17 7.01 0.97 5.49 0.40 烧结赤泥 36.11 5.79 6.78 41.09 1.78 0.27 2.83 0.87 4.10 0.38 
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