Self-reduction carbon-containing pellet

A technology of carbon pellets and raw materials, which is applied in the field of self-reducing carbon-containing pellets, can solve problems such as refractory material erosion, impact on the environment, and poor melting performance, and achieve fast slag removal, increased iron production, and remarkable energy-saving effects Effect

Inactive Publication Date: 2012-12-19
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the reduction process of the existing carbon-containing pellets, a high roasting temperature (≥1450°C) is required to realize the dissolution of iron slag. The main reason is that the melting performance of slag is not good.
Although adding an appropriate amount of fluorite can improve the melting performance of slag, it will cause serious erosion of refractory materials and affect the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, according to the mass percentage of iron ore concentrate powder 69%, coal powder 22%, calcium ferrite powder 7%, bentonite 2% for batching (control chemical composition C / O=1.2), and put the materials into the mixer for processing Stir and mix, after mixing evenly, inject an appropriate amount of water, and stir and mix again, after mixing evenly, send the final mixture into the ball press machine, press into pellets, and after the pellets are dried, they will become the pellets described in the present invention. Self-reducing carbonaceous pellets. The self-reduced carbon-containing pellets are used in the trolley-type continuous reduction furnace process, the heating temperature is 1350 ° C, and the reduction time is 20 minutes, and the granular iron of 5-20 mm can be obtained.

Embodiment 2

[0019] First, carry out batching according to the mass percentage containing iron dust sludge 11%, oxidized iron scale 49%, blast furnace gas ash 31%, calcium ferrite powder 8% and bentonite 1% (control C / O=1.1 in the chemical composition), and put the materials Stir and mix in the mixer. After mixing evenly, add a small amount of water glass and water, and stir and mix again. After mixing evenly, send the final mixture into the ball press and press it into pellets. After drying, it becomes the composite carbon-containing pellets of the present invention. The self-reduced carbon-containing pellets are used in the rotary hearth furnace process, the heating temperature is 1350 ° C, and the reduction time is 20 minutes, and the granular iron of 5-20 mm can be obtained.

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PUM

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Abstract

The invention discloses a self-reduction carbon-containing pellet which is suitable for production of grained iron by a horizontal moving bed reduction process. The carbon-containing pellet comprises the following components of: by weight, 60-80% of an iron-containing raw material (dry basis), 10-35% of a carbon-containing raw material (dry basis), 1-5% of a binder (dry basis) and an additive. The invention is characterized in that a calcium ferrite powder is used as the additive; its dry basis content is 5-10 wt%; and C/O in the chemical components is controlled within 1.1-1.3. The self-reduction carbon-containing pellet provided by the invention will not erode refractory materials or destroy the environment, and can be used to improve melting performance of slag and produce grained iron with large granularity at the roasting temperature of 1350-1450 DEG C.

Description

technical field [0001] The invention relates to a carbon-containing pellet used for iron and steel smelting, in particular to a self-reducing carbon-containing pellet used in a horizontal moving bed reduction process. Background technique [0002] Carbon-containing pellets usually refer to a kind of iron-containing powder mixed with certain carbon (such as coal powder and coke powder, etc.) Spherical compacts containing carbon and iron. In the field of iron and steel metallurgy, different metallurgical processes have different requirements for carbon-containing pellets. In the non-blast furnace ironmaking process for the purpose of direct reduction, the carbon-containing pellets that have been publicly used generally adopt the following composition: [0003] The mass percentage of iron-containing raw materials on a dry basis is 50% to 85%, the mass percentage of carbon-containing raw materials on a dry basis is 7% to 35%, the mass percentage of a binder on a dry basis is 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243
Inventor 王再义王相力张伟张宁张立国邓伟
Owner ANGANG STEEL CO LTD
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