1. Metallurgical Technology Research Department, Central Iron and Steel Research Institute, Beijing 100081, China 2. State Key Laboratory for Advanced Iron and Steel Processes and Products, Central Iron and Steel Research Institute,Beijing 100081, China 3. WU Xi Zhao Shun Stainless Steel Middle Plate Co., Ltd., Wuxi 214401, Jiangsu, China
Reduction of Carbon-bearing Pellets of Oolitic Hematite in a Shaft Furnace
1. Metallurgical Technology Research Department, Central Iron and Steel Research Institute, Beijing 100081, China 2. State Key Laboratory for Advanced Iron and Steel Processes and Products, Central Iron and Steel Research Institute,Beijing 100081, China 3. WU Xi Zhao Shun Stainless Steel Middle Plate Co., Ltd., Wuxi 214401, Jiangsu, China
ժҪ When carbon-bearing pellets of oolitic hematite are treated in a shaft furnace, some problems are typically encountered: the metallization ratio of the metal pellets is low; the carbon-bearing pellets bond with each other at high temperatures; and the separation of phosphorus from iron is difficult. To solve these problems, experiments were conducted on oolitic hematite reduction in a resistance furnace and semi-industrial test shaft furnace. The results showed that the metallization rate reached 90% or greater under the conditions of a reduction temperature of 1150 ��, an atmosphere of simulated flue gas, and a reduction time between 1.5 and 2.0 h. The problem of high-temperature bonding among pellets can be solved by increasing the strength of the pellets, coating their surface with a surface transfer agent and maintaining an even temperature inside the shaft furnace. The basicity of the ore blend exerted no obvious effect on the magnetic concentrate and phosphorus content. The phosphorus content in the magnetic concentrate can be further reduced by improving the grinding capacity of the ball mills used in the experiments. On the basis of the experimental results related to oolitic hematite reduction with carbon-bearing pellets in a shaft furnace, the experimental requirements were satisfied with an average 88.27% total Fe content and 0.581% P content in the pellets.
Abstract��When carbon-bearing pellets of oolitic hematite are treated in a shaft furnace, some problems are typically encountered: the metallization ratio of the metal pellets is low; the carbon-bearing pellets bond with each other at high temperatures; and the separation of phosphorus from iron is difficult. To solve these problems, experiments were conducted on oolitic hematite reduction in a resistance furnace and semi-industrial test shaft furnace. The results showed that the metallization rate reached 90% or greater under the conditions of a reduction temperature of 1150 ��, an atmosphere of simulated flue gas, and a reduction time between 1.5 and 2.0 h. The problem of high-temperature bonding among pellets can be solved by increasing the strength of the pellets, coating their surface with a surface transfer agent and maintaining an even temperature inside the shaft furnace. The basicity of the ore blend exerted no obvious effect on the magnetic concentrate and phosphorus content. The phosphorus content in the magnetic concentrate can be further reduced by improving the grinding capacity of the ball mills used in the experiments. On the basis of the experimental results related to oolitic hematite reduction with carbon-bearing pellets in a shaft furnace, the experimental requirements were satisfied with an average 88.27% total Fe content and 0.581% P content in the pellets.
��������:Item Sponsored by 2013BAE07B03 of National Science and Technology Support Program for 12th Five Year Plan of China
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Wei WU,Jian-jun GAO,Jia-qing ZENG,Yuan-hong QI,Jian-chang WANG,Xi-dong ZHANG. Reduction of Carbon-bearing Pellets of Oolitic Hematite in a Shaft Furnace[J]. �й������ڿ���, 2016, 23(3): 210-219.
Wei WU,Jian-jun GAO,Jia-qing ZENG,Yuan-hong QI,Jian-chang WANG,Xi-dong ZHANG. Reduction of Carbon-bearing Pellets of Oolitic Hematite in a Shaft Furnace. Chinese Journal of Iron and Steel, 2016, 23(3): 210-219.
2016, Vol. 23 
