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| AN INVESTIGATION ON THE REDUCTION DISINTEGRATION OF SINTERS MADE FROM CHINESE MAGNETITE IRON ORE CONCENTRATES |
| Zhou Quding; Ren Yunfu (Beijing University of Iron and Steel Technology); Yang Xuhui (Ma'anshan Iron and Steel Company) |
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Cite this article:
Zhou Quding; Ren Yunfu (Beijing University of Iron and Steel Technology); Yang Xuhui (Ma'anshan Iron and Steel Company). AN INVESTIGATION ON THE REDUCTION DISINTEGRATION OF SINTERS MADE FROM CHINESE MAGNETITE IRON ORE CONCENTRATES. Acta Metall Sin, 1982, 18(6): 635-763.
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Abstract An investigation was carried out on the reduction disintegration properties of two typical sinters made from Chinese high grade magnetite iron ore concentrates produced by Qian'an and Ma'anshan areas. The test was carefully compared with that of Australia hematite ore fines in a specially designed rotary tube. It was found that the worst resistance to the reduction disintegration seems to be displayed for the Chinese sinters with the basicity CaO/SiO_2 in the region about 1.7—1.8 and under temperature of reduction at 500℃, as weU as it has much improved since the CaO/SiO_2 ratio beyond the region, namely 1.0 or 2.5. WhiLst the reduction disintegration index of the Australia hematite sinter decreases with the increase of its basicity.By changing the test temperature of reduction and adopting H_2 as a reducing gas instead of CO, an examination of the sinters on the entire reduction process under petrographic microscope shows that the reduction disintegration properties of Chinese magnetite sinters with different basicities are closely related to their mineral composition and microtexture. The carbon deposition may bc also an important factor affecting their reduction strength. However, the phase transformation of Fe_2O_3 during reduction influenced them slightly due to its small content.Experiments were also made of the properties of the sinters in 55m~3 blast furnace, in which a perforate steel probe tube filled with several Myers of testing sinter and coke was inserted. The result is very conformable to that in the rotary tube.
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Received: 18 June 1982
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