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Method for producing low-phosphorus molten iron by utilizing oxygen-enriched top blown to carry out melting reduction on high-phosphorus iron ore

A technology of oxygen-enriched top-blowing and high-phosphorus iron ore, applied in the field of energy and metallurgy, can solve the problems of heavy pollution, low thermal efficiency, and high energy consumption of blast furnace ironmaking technology

Inactive Publication Date: 2010-12-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention emerges at the historic moment under the increasingly deteriorating environment of iron ore resources, and is used to solve the problems of high energy consumption, heavy pollution, low thermal efficiency of blast furnace ironmaking technology, and difficulty in smelting large reserves of lean iron ore in my country

Method used

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  • Method for producing low-phosphorus molten iron by utilizing oxygen-enriched top blown to carry out melting reduction on high-phosphorus iron ore
  • Method for producing low-phosphorus molten iron by utilizing oxygen-enriched top blown to carry out melting reduction on high-phosphorus iron ore
  • Method for producing low-phosphorus molten iron by utilizing oxygen-enriched top blown to carry out melting reduction on high-phosphorus iron ore

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Effect test

Embodiment 1

[0062] Example 1 Huimin iron ore (TFe (%) = 49.01, FeO (%) = 1.36, SiO 2 (%)=18.99, Al 2 o 3 (%)=5.81, MgO(%)=0.23, CaO(%)=0.36, TiO 2 (%) = 0.28, S (%) = 0.038, P (%) = 0.90), flux and coal (C (%) = 76.43, ash (%) = 15.29, volatile matter (%) = 7.78, CaO (%) )=1.59, SiO 2 (%)=7.80, S (%)=0.35, P (%)=0.050) powder crushing (≤30mm), be 1.1 according to basicity, carbon ratio C / O is 1.1 process parameter proportioning mixing, by Furnace side injection enters the smelting reduction furnace, the furnace temperature is controlled at 1450°C, and the molten iron results obtained under the condition of oxygen-enriched top blowing: the recovery rate of iron reaches about 86.8%, the phosphorus content in pig iron is 0.32%, and the sulfur content is 0.1645 %, because the content of sulfur and phosphorus is still high, so the remaining oxidative atmosphere is used to continue the dephosphorization outside the furnace after the molten iron is released. The models of oxygen-enriched an...

Embodiment 2

[0063] Example 2 The above raw materials are the same, according to the basicity of 1.1, the carbon ratio C / O is 1.1, the process parameters are mixed evenly, sprayed into the smelting reduction furnace from the side of the furnace, and the furnace temperature is controlled at 1400 ° C. The result of molten iron under blowing conditions: the recovery rate of iron reaches about 84.3%, the phosphorus content in pig iron is 0.23%, and the sulfur content is 0.07%. According to the requirements for molten iron, it is decided whether to carry out dephosphorization and desulfurization outside the furnace, and then sent to Steel workshop.

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Abstract

The invention discloses a method for producing molten iron by using high-phosphorus iron ore as a raw material, coal dust as a reductant and limestone or dolomite as a fusing agent under the condition of oxygen-enriched top blown. The method comprises the following technological steps: crushing the high-phosphorus iron ore, the limestone, the dolomite and the reductant; proportioning, evenly mixing and preheating according to the alkalinity R of 1.0-2.0 and the inner carbon rate C / O of 0.9-1.3; and enabling nitrogen as a carrier gas to pass into a melting reduction furnace from a furnace side for blowing furnace materials, and producing the low-phosphorus molten iron under the condition of oxygen-enriched top blown, wherein the molten iron and the slag are respectively discharged from an iron-notch and a slag discharge notch at regular intervals. High temperature fume dust removal, secondary combustion, cogeneration and extra furnace dephosphorization and desulfurization are carried out. The invention overcomes the difficult problem that the traditional method is difficult for smelting the high-phosphorus iron ore, and has simple requirements for the raw materials and low construction cost; and the waste heat and chemical energy of high temperature furnace gas can be fully and effectively utilized, thereby being beneficial to developing abundantly stored high-phosphorus iron ore resources in China and strengthening the international competitiveness of iron and steel enterprises in China.

Description

technical field [0001] The invention relates to a method for producing low-phosphorus molten iron by using oxygen-enriched top-blown smelting reduction of high-phosphorus iron ore, which belongs to the technical field of energy and metallurgy. Background technique [0002] Today, China's economy is developing rapidly, and the demand for steel in modernization is still rigid. After hundreds of years of development, blast furnace ironmaking has become the mainstream technology in the world. However, its process is long, large investment, serious environmental pollution, poor operational flexibility, poor selectivity to raw materials, especially the shortage of coking coal resources and the blast furnace system. High energy consumption has hindered the further development of blast furnace ironmaking. Nowadays, non-blast furnace ironmaking technology is developing rapidly, and individual technologies have become increasingly mature and gradually industrialized. [0003] In my ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C21C7/064
Inventor 王华李慧斌卿山李幼灵张竹明杨雪峰
Owner KUNMING UNIV OF SCI & TECH
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