Effect of coal levels during direct reduction roasting of high phosphorus oolitic hematite ore in a tunnel kiln
Effect of coal levels during direct reduction roasting of high phosphorus oolitic hematite ore in a tunnel kiln
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高磷鲕状赤铁矿隧道窑直接还原焙烧过程中煤含量的影响
DOI：
10.1016/j.ijmst.2012.04.007
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发表时间：
2012-05
影响因子：
11.8
通讯作者：
孙体昌
中科院分区：
文献类型：
--
作者：
孙体昌
研究了某高磷鲕状赤铁矿经直接还原焙烧后，不同煤浓度对除磷效果的影响。将原矿、煤和除磷剂混合，然后在隧道窑中焙烧。焙烧产物经两段磨矿后再进行磁选处理。采用XRD和SEM-EDS分析了焙烧产物的差异。结果表明，煤是影响直接还原焙烧过程的重要因素之一。当内煤含量由0%增加到15%时，铁品位由94.94%线性下降至88.81%，铁回收率由55.94%线性上升至92.94%。同时，磷含量由0.045%提高到0.231%。增加内煤含量也使更多的赤铁矿还原为金属铁，但在高煤负荷下，焙烧产物的鲕状结构得以保留。直接还原焙烧后原矿中磷的物相没有发生变化。煤对h精矿中磷含量的影响是由于从含磷矿物中机械分离金属铁的难度发生了变化。
The effect of coal levels on phosphorus removal from a high phosphorus oolitic hematite ore after direct reduction roasting have been investigated. Raw ore, coal, and a dephosphorization agent were mixed and the mixture was then roasted in a tunnel kiln. The roasted products were treated by two stages of grinding followed by magnetic separation. XRD and SEM–EDS examination of the products was used to analyze differences in the roasted products. The results show that coal is one of the most important factors affecting the direct reduction roasting process. When the inner coal levels increased from 0% to 15% the iron grade decreased linearly from 94.94% to 88.81% and the iron recovery increased from 55.94% to 92.94%. At the same time the phosphorus content increased from 0.045% to 0.231%. Increasing the inner coal levels also caused more hematite to be reduced to metallic iron but the oolitic structure of the roasted product was preserved in the presence of high coal loading. The phase of the phosphorus in raw ore was not changed after direct reduction roasting. The effect of coal on the phosphorus content in the H-concentrate arises from changes in the difficulty of mechanically liberating the metallic iron from the phosphorus bearing minerals.
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DOI：
10.1007/bf02670207
发表时间：
1986-09
期刊：
Metallurgical Transactions B
影响因子：
--
作者：
S. Weissberger;Y. Zimmels;I. Lin
通讯作者：
S. Weissberger;Y. Zimmels;I. Lin
影响因子：
4.8
作者：
Cheng, CY;Misra, VN;Mun, R
通讯作者：
Mun, R
DOI：
10.1016/s1006-706x(11)60055-1
发表时间：
2011-05
影响因子：
2.5
作者：
Wen-tang Xia;Zheng-de Ren;Y. Gao
通讯作者：
Wen-tang Xia;Zheng-de Ren;Y. Gao
DOI：
--
发表时间：
2011
期刊：
Mining and Metallurgical Engineering
影响因子：
--
作者：
Li Zhi-xiang
通讯作者：
Li Zhi-xiang
影响因子：
4.7
作者：
Delvasto, P.;Valverde, A.;Garcia-Balboa, C.
通讯作者：
Garcia-Balboa, C.