Rotary hearth furnace iron-making method utilizing biomass carbon-containing pellet to serve as raw material

A biomass raw material and biomass technology, applied in fluidized bed furnaces and other directions, can solve the problems of large consumption of fossil energy such as coal, low thermal efficiency and productivity of the process, and high sulfur content in products, so as to improve thermal efficiency, productivity, and thermal efficiency of the process. The effect of improvement and smelting efficiency improvement

Inactive Publication Date: 2012-07-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to use biomass instead of coal in the coal-based rotary hearth furnace ironmaking process to solve the large consumption of fossil energy such as coal in the rotary hearth furnace ironmaking production process, and the CO 2 , SO 2 , NO x Such problems as large emissions, high sulfur content in products, low process thermal efficiency and productivity, etc.

Method used

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  • Rotary hearth furnace iron-making method utilizing biomass carbon-containing pellet to serve as raw material
  • Rotary hearth furnace iron-making method utilizing biomass carbon-containing pellet to serve as raw material
  • Rotary hearth furnace iron-making method utilizing biomass carbon-containing pellet to serve as raw material

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Embodiment 1

[0026] The dried waste wood was carbonized in a carbonization furnace at 500°C for 40 minutes to obtain biomass coke (M=1.20%, A=0.75%, V=16.50%, FC=81.55%), which was crushed and sieved to less than 150 μm. According to C / O=1.15, mix a certain amount of magnetite powder with a grade of 65% and biomass coke powder, add 3% of bentonite binder and 6% of the total mass of water, and mix well to make carbon-containing spheres The pellets were dried and placed in a rotary hearth furnace for reduction. The reduction temperature was 1280°C and the reduction time was 25 minutes. Metallized pellets with a metallization rate of 80% and a sulfur content of 0.007% were obtained.

Embodiment 2

[0028] The dried waste wood was carbonized in a carbonization furnace at 600°C for 50 minutes to obtain biomass coke (M=0.80%, A=0.85%, V=12.50%, FC=85.85%), which was crushed and sieved to a size below 150 μm. Mix a certain amount of hematite powder with a grade of 60% and biomass coke powder according to C / O=1.25, add 2.5% of bentonite binder and 7% of the total mass of water, and mix well to make carbon-containing spheres The pellets were dried and placed in a rotary hearth furnace for reduction. The reduction temperature was 1350°C and the reduction time was 35 minutes. Metallized pellets with a metallization rate of 85% and a sulfur content of 0.009% were obtained.

Embodiment 3

[0030] The dried waste wood was carbonized in a carbonization furnace at 700°C for 30 minutes to obtain biomass coke (M=0.75%, A=0.95%, V=12.30%, FC=86.00%), which was crushed and sieved to a size below 150 μm. Mix a certain amount of 55% iron-containing powder with biomass coke powder according to C / O=1.20, add 3.5% bentonite binder and 6.5% water in total mass, and mix well to make carbon-containing spheres The pellets were dried and placed in a rotary hearth furnace for reduction. The reduction temperature was 1300°C and the reduction time was 30 minutes. Metallized pellets with a metallization rate of 82% and a sulfur content of 0.008% were obtained.

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Abstract

A rotary hearth furnace iron-making method utilizing biomass carbon-containing pellets to serve as a raw material belongs to the field of ferrous metallurgy and relates to a rotary hearth furnace iron-making process using the biomass to serve as iron-making fuel and a reducing agent. The process comprises the steps, utilizing reproducible carbon neutral biomass coke powder to replace pulverized coal, enabling the biomass coke powder and the iron ore powder to be matched with each other according to C/O=1.1-1.4, adding an appropriate binder, evenly mixing to make pellets, and enabling the pellets to enter a rotary hearth furnace to be heated and undergo reduction so that a metalized pellet is obtained. The biomass coke has carbon neutral and can fundamentally reduce discharge of pollutantssuch as CO2 caused by coal consumption. The impurity content of the biomass coke is little, the problem that sulphur content of products caused by coal using is too high is solved, and the comprehensive quality of the products is improved. The energy in the preparation process of the biomass coke can be supplied by biomass itself, and green circulating production is substantially achieved. The rotary hearth furnace iron-making method expands energy sources for rotary hearth furnace iron making, reduces production cost, improves product quality and production efficiency and reduces environmental pollution.

Description

technical field [0001] The invention belongs to the field of ferrous metallurgy. The invention is suitable for a coal-based rotary hearth furnace ironmaking process, and relates to a rotary hearth furnace ironmaking process using biomass as an ironmaking fuel and a reducing agent. Background technique [0002] Blast furnace ironmaking is the leading process of steel production at present, and the technology is very perfect. However, this process must rely on heavily polluting processes such as coking and sintering to provide raw material security. As a new non-blast furnace ironmaking process, rotary hearth furnace (RHF) ironmaking has the characteristics of strong raw material adaptability and short production cycle. It can use various grades of coal powder as fuel and reducing agent, iron concentrate powder, etc. Various iron-containing powders are used as raw materials. The raw materials, fuel and appropriate amount of binder are mixed in proportion and pressed into car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C21B13/00
Inventor 左海滨张建良胡正文杨天钧
Owner UNIV OF SCI & TECH BEIJING
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