Ore blending method for improving heat-state intensity index of sintering ore
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A technology of thermal strength and sintering ore, applied in the field of sintering production process, can solve the problems of affecting blast furnace output and coke ratio, increasing fuel consumption, affecting blast furnace screening system, etc. state strength index and the effect of improving blast furnace output
Inactive Publication Date: 2012-12-12
ANGANG STEEL CO LTD
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However, if the FeO content of sinter is controlled too high, in addition to the increase of fuel consumption, it will also cause the reduction index of sinter to decrease, which will affect the blast furnace output and coke ratio.
At the same time, the spraying of calcium chloride on the finished sinter not only affects the screening system of the blast furnace, but also seriously shortens the service life of the dust collector of the blast furnace
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Embodiment 1
[0016] Hematite powder is made of Brazilian SiO 2 ≥5% high silicon hematite powder and SiO 2 2 4.5%, CaO 0.5%, MgO 12.2%, Al 2 o 3 0.4%, B 2 o 3 3.4%, S 0.4%, Ig loss 3.3%, crystal water 1.4%.
[0017]
[0018] Its raw material proportioning weight percentage is:
[0019] Brazilian high-silicon hematite powder is 35%, low-silicon hematite powder is 35%, magnetite powder is 15%, boron magnesium iron concentrate powder is 8%, and mixture is 7%.
Embodiment 2
[0021] The hematite powder is selected from the hematite powder produced by Australia's Hamersley Mine, Mike Mine and Newman Mine. Sinter basicity R=2.1, MgO=2.0wt%. The main components of boron magnesium iron concentrate powder are: TFe 54%, FeO 21.6%, SiO 2 5.5%, CaO 0.7%, MgO 10.3%, Al 2 o 3 0.2%, B 2 o 3 4.8%, S 0.3%, Ig loss 4.4%, crystal water 1.0%.
[0022] Its raw material proportioning weight percentage is:
[0025] Hematite powder is made of Brazilian SiO 2 ≥5% high silicon hematite powder and SiO 2 2 4.9%, CaO 0.66%, MgO 11.4%, Al 2 o 3 0.26%, B 2 o 3 3.5%, S 0.44%, Ig loss 3.85%, crystal water 1.2%.
[0026] Its raw material proportioning weight percentage is:
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Abstract
The invention provides an ore blending method for improving a heat-state intensity index of a sintering ore. The ore is prepared from the following raw materials in percentage by weight: 66-88 percent of hematite powder, 5-15 percent of magnet ore powder, 3-12 percent of ludwigite concentrate fines, and 4-7 percent of mixed material; the ludwigite concentrate fines comprise the main components in percentage by weight: 52-54 percent of TFe, 20-24 percent of FeO, 4-6 percent of SiO, 0.5-1.0 percent of CaO, 10-13 percent of MgO, 0.2-0.4 percent of Al2O3, 3-5 percent of B2O3, 0.3-0.5 percent of S, 3-5 percent of burning loss Ig and 1.0-1.5 percent of crystal water. According to the ore blending method, the heat-state intensity index of the sintering ore can be obviously improved, and low-temperature reduction degradation ratio of the sintering ore is reduced on the premise that the requirements of a blast furnace on the grade of the sintering ore and the alkalinity can be completely met. The low-temperature reduction degradation index RDI+3.15mm of the sintering ore reaches an average of 62.92 percent, and the low-temperature reduction degradation index RDI-0.5mm reaches 7.11 percent, so that the smooth operation of the production of the blast furnace can be guaranteed, the yield of the blast furnace is improved, and the coke ratio is reduced.
Description
technical field [0001] The invention belongs to the field of sintering production technology, and in particular relates to an ore blending method for producing sintered ore by using imported hematite powder to improve the thermal strength index. Background technique [0002] With the increasing sintering production capacity, the domestically produced iron-containing raw materials are far from meeting the needs of sintering production, so sintering production has to use a large amount of imported rich ore powder. At present, the imported rich mineral powder mainly comes from countries such as Brazil, Australia, South Africa and India. Since the imported rich ore powder is mainly composed of Fe 2 o 3 Composition of hematite, and Al 2 o 3 The high content will lead to the decline of the hot strength index of sinter and the deterioration of blast furnace smelting conditions, which will directly affect the output and coke ratio of blast furnace. [0003] Under normal sinter ...
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