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Carbon containing pellet for producing low-sulfur grained iron

A low-sulfur granulated iron and carbon ball technology, applied in the field of iron and steel metallurgy, can solve the problems of rising melting point of slag, and achieve the effects of improving product quality, reducing energy consumption and equipment maintenance costs

Active Publication Date: 2014-01-15
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to control the sulfur content in the granular iron in the above-mentioned method, often adjust the component in the raw material to make the alkalinity (CaO / SiO 2 or (CaO+MgO) / SiO 2 ) reaches a higher value, although it is effective for sulfur control of granular iron, it also leads to an increase in the melting point of slag, so that carbon-containing pellets generally require a higher roasting temperature (≥1450°C) to achieve iron slag melting; On the one hand, it is hoped that the sulfur content of the produced iron pellets can be further reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to mass percentage, iron concentrate powder 61%, coal powder (carbon content 72.5%, sulfur content 0.8%) 21%, fluorite powder (CaF 2 Content 93%) 5%, limestone powder 13% for batching, control chemical composition (C / O)=1.1, ([CaO]+[MgO]) / ([SiO 2 ]+[Al 2 o 3 ])=1.13, [MgO] / [Al 2 o 3 ]=0.91. Put the solid material (the proportion of particle size less than 0.074mm is 80%) into the mixer for stirring and mixing. After mixing evenly, inject an appropriate amount of water and stir again. After mixing evenly, send the final mixture into the ball briquetting machine , pressed into pellets, and after the pellets are dried, they become the carbon-containing pellets of the present invention. The carbon-containing pellets are used in the trolley-type reduction furnace process, the heating temperature is 1350°C, and the reduction time is 20 minutes, to obtain 3-30mm granular iron, and the sulfur content of the obtained granular iron is 0.022%.

Embodiment 2

[0015] According to the mass percentage, it contains 8% iron dust, 44% iron scale, 34% blast furnace gas ash, 6% quicklime powder, fluorite powder (CaF 2 Content 92.5%) 4%, water glass 4% for batching, control chemical composition (C / O)=1.1, ([CaO]+[MgO]) / ([SiO 2 ]+[Al 2 o 3 ])=0.96, [MgO] / [Al 2 o 3 ]=0.87. First put the solid material (72% of the particle size is less than 0.074mm) into the mixer for stirring and mixing. After mixing evenly, put in water glass and stir again. After mixing evenly, send the final mixed material into the press In the ball machine, it is pressed into pellets, and after the pellets are dried, they become the carbon-containing pellets of the present invention. The carbon-containing pellets are used in the trolley-type continuous reduction furnace process, the heating temperature is 1380°C, and the reduction time is 20 minutes, and 3~30mm granular iron can be obtained, and the sulfur content of the obtained granular iron is 0.028%.

Embodiment 3

[0017] According to mass percentage, iron concentrate powder 64%, coke powder 16%, fluorite powder (CaF 2 Content 93%) 2.5%, bentonite 5%, limestone powder 10%, dolomite powder 2.5% for batching, control chemical composition (C / O)=1.2, ([CaO]+[MgO]) / ([SiO 2 ]+[Al 2 o 3 ])=1.03, [MgO] / [Al 2 o 3 ]=0.97. Put the solid material (the proportion of particle size less than 0.074mm is 75%) into the mixer for stirring and mixing. After mixing evenly, inject an appropriate amount of water and stir again. After mixing evenly, send the final mixture into the ball press machine , pressed into pellets, and after the pellets are dried, they become the carbon-containing pellets of the present invention. The carbon-containing pellets are used in the trolley-type continuous reduction furnace process, the heating temperature is 1380°C, and the reduction time is 20 minutes, and 3~30mm granular iron can be obtained, and the sulfur content of the obtained granular iron is 0.034%.

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Abstract

The invention provides a carbon containing pellet for producing low-sulfur grained iron, the carbon containing pellet comprises the following components: 50%-70% of an iron containing raw material, 15%-35% of a carbon containing raw material, 2%-5% of an additive and 0%-5% of a binder, wherein the molar ratio of fixed carbon in the total pellet raw materials to iron oxide oxygen atoms in the iron containing raw material is controlled to satisfy (C / O) = 1.1-1.2, the carbon containing pellet also comprises 5%-15% of one of CaO containing substances and 0%-3% of one of MgO containing substances, and ([CaO]+ [MgO]) / ([SiO2] + [Al2O3]) = 0.95-1.20 and [MgO] / [Al2O3] = 0.85-1.15 are satisfied. The self-reduction carbon containing pellet of the invention is used for horizontal-moving-bed reducing process, is low in baking temperature, can effectively reduce the energy consumption and equipment maintenance costs, and can obtain the low-sulfur grained iron with the sulfur content of less than 0.04% so as to further improve the quality of a product.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and mainly relates to carbon-containing pellets used in iron and steel smelting, in particular to self-reducing carbon-containing pellets used in the production of low-sulfur granular iron by a horizontal moving bed reduction process. Background technique [0002] Carbon-containing pellets usually refer to iron-containing powder (such as iron ore powder, etc.) mixed with certain carbon-containing powder (such as coal powder, coke powder, etc.) and an appropriate binder. A carbon-containing and iron-containing spherical agglomerate made by a pellet machine or a pelletizer. In the field of iron and steel metallurgy, different metallurgical processes have different requirements and uses for carbon-containing pellets. In the field of non-blast furnace ironmaking, carbon-containing pellets are used to produce direct reduced iron or granulated iron, which is characterized by no coke ...

Claims

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Application Information

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IPC IPC(8): C22B1/24
Inventor 张伟王再义王相力张立国邓伟韩子文王亮
Owner ANGANG STEEL CO LTD
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