Method for melting, reducing and smelting high-titanium iron ore by oxygen-enriched top blowing

An oxygen-enriched top blowing and iron ore technology, applied in the direction of reducing gas emissions, can solve the problems of high pollution, low thermal efficiency, and high energy consumption of blast furnace ironmaking technology

Inactive Publication Date: 2012-06-20
KUNMING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0006] The new smelting technology of high-efficiency utilization of high-temperature furnace gas of the present invention emerges at the historic moment under the above-mentioned environment, and is used to solve the problems of high energy consumption, heavy pollution, low thermal efficiency of blast furnace ironmaking technology and the difficulty of smelting large reserves of lean iron ore in my country in blast furnaces

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  • Method for melting, reducing and smelting high-titanium iron ore by oxygen-enriched top blowing
  • Method for melting, reducing and smelting high-titanium iron ore by oxygen-enriched top blowing
  • Method for melting, reducing and smelting high-titanium iron ore by oxygen-enriched top blowing

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Embodiment 1

[0063] Mengqiao iron ore (TFe=60.06%, FeO(%)=28.22, SiO 2 (%)=2.96, Al 2 o 3 (%)=3.98, MgO(%)=2.44, CaO(%)=0.58, TiO 2 (%) = 6.47, S (%) = 0.12, P (%) = 0.01), 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 1500°C, and the molten iron results obtained under the condition of oxygen-enriched top blowing: the recovery rate of iron reaches about 92.5%, the titanium content in pig iron is 0.043%, and the phosphorus content is 0.019%, and the sulfur content is 0.30% higher, so it needs to be desulfurized outside the furnace after the molten iron is released, and then sent to the steelmaking workshop. The models of oxygen-enriched and charge preheaters, dust collectors and g...

Embodiment 2

[0065] The above-mentioned raw materials are the same, according to the basicity of 1.3, the carbon ratio C / O is 1.1, the process parameters are mixed and mixed, and then sprayed into the smelting reduction furnace from the side of the furnace, and the furnace temperature is controlled at 1550°C. The molten iron results obtained as follows: the recovery rate of iron reaches about 94.5%, the titanium content in pig iron is 0.038%, the phosphorus content is 0.016%, and the sulfur content is 0.26%, so it is still necessary to desulfurize the molten iron after it is released from the furnace. , and sent to the steelmaking workshop.

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Abstract

The invention discloses a method using a high-titanium iron ore as a raw material, pulverized coal as a reducer and limestone and dolomite as a fusing agent to produce molten iron and high-titanium slag under the condition of oxygen-enriched top blowing, which belongs to the technical fields of energy resources and metallurgy. The method comprises the following technological steps of: crushing the high-titanium iron ore, the dolomite, the limestone and the pulverized coal, mixing evenly according to the mixture ratio of the technological parameters, preheating, then taking the treated gas with high heat value as carrier gas to blow a furnace charge from a furnace side to enter a melting and reducing furnace, smelting under the condition of the oxygen-enriched top blowing and discharging the products of the molten iron and the high-titanium slag of the method by a taphole and a deslagging port periodically and respectively. By means of the characteristics of strong oxidizing atmosphereand high titanyl affinity in the furnace, the invention treats the high-titanium iron ore which is difficult to smelt in a blast furnace. The process has simple requirement to the raw material and low construction cost, recycles high-temperature furnace gas, reaches the standard of zero discharge and has better effects of energy saving and discharge reduction. The process is beneficial to developing a large amount of ilmenite resources stored in China and also has a very large promotion function to the development of the titanium industry of China.

Description

technical field [0001] The invention relates to a method for smelting high ilmenite ore by using ordinary coal powder as a reducing agent under the condition of oxygen-enriched top-blown smelting reduction, simultaneously using high-temperature furnace gas to preheat oxygen-enriched and charge, and compressing the treated high-calorific-value tail gas as a carrier The gas-injected furnace charge enters the smelting reduction furnace so that the high-temperature furnace gas generated by the smelting reduction furnace can be used more efficiently, and 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. Under the pressure of reducing output every year, domestic annual steel output is still growing rapidly, and it is still difficult to eliminate backward production capacity. After hundreds of years of development, blast furnace ironmaking ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/00C22B34/10C22B5/10
CPCY02P10/122Y02P10/128
Inventor 王华李慧斌卿山
Owner KUNMING UNIV OF SCI & TECH
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