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Method for producing molten iron with high-phosphorus and low-iron refractory iron ore

A technology for iron ore and refractory ore, which is applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve problems such as the contradiction between supply and demand of iron ore resources, and achieve the goals of solving the contradiction between supply and demand, high recovery rate of ore iron, and improving reducibility Effect

Inactive Publication Date: 2011-04-06
KUNMING IRON & STEEL HLDG CO LTD
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for producing molten iron with high phosphorus and low iron refractory iron ore, so that the high phosphorus and low iron refractory ore can be fully and effectively utilized to solve the problem of the contradiction between supply and demand of iron ore resources in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] High phosphorus and low iron refractory iron ore is used as raw material, lignite near the mining area is used as reducing agent, and the chemical composition of the ore is: TFe: 34.7%, S: 0.304%, P: 1.01%, FeO: 2.68%, Fe 2 o 3 : 46.60%, SiO 2 : 29.84%, TiO 2 : 0.20%, AL 2 o 3 : 2.89%, CaO: 1.32%, MgO: 0.35%, MnO: 3.68%, K 2 O: 0.11%, Ig: 11.01%, after the following process steps:

[0038] A. After the above-mentioned ore is crushed with a jaw crusher in the prior art, the ore is put into a roasting furnace, and at a temperature of 980 ° C, it is oxidized and roasted for 1.5 hours to obtain an oxidized roasted mineral. The main chemical composition of the mineral is : TFe: 38.6%, P: 0.970%, S: 0.064%, desulfurization rate 78.95%, dephosphorization rate 3.96%, ore loss rate 11.30%;

[0039] B. Add 35% carbon of the oxidized and roasted minerals to the obtained oxidized and roasted minerals in step A, send them into the direct reduction furnace, and carry out coal-b...

Embodiment 2

[0044] High phosphorus and low iron refractory iron ore is used as raw material, lignite near the mining area is used as reducing agent, and the chemical composition of the ore is: TFe: 31.19%, S: 1.35%, P: 1.05%, FeO: 29.01%, Fe 2 o 3 : 12.35%, SiO 2 : 25.53%, TiO 2 : 0.16%, AL 2 o 3 : 3.39%, CaO: 3.89%, MgO: 1.75%, MnO: 2.07%, K 2 O: 0.17%, Ig: 18.99%, after the following process steps:

[0045] A. After the above-mentioned ore is crushed with a jaw crusher in the prior art, the ore is put into a roasting furnace, and at a temperature of 1000 ° C, it is oxidized and roasted for 1 hour to obtain an oxidized roasted mineral. The main chemical composition of the mineral is : TFe: 37.4%, P: 1.03%, S: 0.2%, desulfurization rate 85.18%, dephosphorization rate 1.9%, ore loss rate 17.5%;

[0046] B. In the oxidized roasted mineral obtained in step A, add 40% carbon of the oxidized roasted mineral, and send it into the direct reduction furnace, and carry out coal-based direct r...

Embodiment 3

[0051] The high-phosphorus, low-iron refractory iron ore in Huimin area of ​​Yunnan Province is used as raw material, and the lignite near the mining area is used as the reducing agent. The chemical composition of the ore is: TFe: 45.28%, S: 0.036%, P: 1.05%, FeO: 2.05 %, Fe 2 o 3 : 62.41%, SiO 2 : 15.28%, AL 2 o 3 : 5.08%, CaO: 0.03%, MgO: 0.08%, MnO: 2.00%, K 2 O: 0.16%, Ig: 10.81%, after the following process steps:

[0052] A. After the above-mentioned ore is crushed with a jaw crusher in the prior art, the ore is put into a roasting furnace, and oxidized and roasted for 1.3 hours at a temperature of 1030 ° C to obtain an oxidized roasted mineral. The main chemical composition of the mineral is For: TFe: 52.60%, P: 0.91%, S: 0.02%, desulfurization rate 41.66%, dephosphorization rate 13.52%, ore loss rate 15.20%;

[0053] B. In the oxidized roasted mineral obtained in step A, add 25% carbon of the oxidized roasted mineral, send it into the direct reduction furnace, an...

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Abstract

The invention provides a method for producing molten iron with high-phosphorus and low-iron refractory iron ore, comprising the following steps: taking high-phosphorus and low-iron refractory iron ore as raw material; taking wood coal as reducing agent; oxidizing roasting; directly reducing; magnetically separating and separating; melting and separating; dephosphorizing molten iron; and obtaining the low-phosphorus molten iron. The method can process the extremely refractory iron ore with high P content, high S content, high SiO2 content and low iron level, has high ore iron recovery rate, completely solves the difficulties of the high-phosphorus and low-iron refractory iron ore such as ore selecting and smelting, removing coke, and eliminating high-energy consumption and high-pollution technical process such as ore selecting, sintering, palletizing, coking, etc. Phosphorus-containing slag can realize resource comprehensive utilization. A great number of experiments and semi-industrial production demonstrate that the technical economic effect of the method is remarkable and effectively solves the current problem of ore resources supply-demand contradiction in China.

Description

technical field [0001] The invention relates to a method for producing molten iron with high phosphorus and low iron refractory iron ore, belonging to the technical field of ore smelting. Background technique [0002] my country is a big country in the iron and steel industry. Since 1996, the steel output has exceeded 100 million tons, and it has been ranking first in the world. In 2008, the steel output reached a record 500 million tons. The increase in production has led to a large consumption of raw materials. Although domestic iron ore production has developed to a certain extent in recent years, its growth rate is far lower than that of steel production. The domestic iron ore supply has been insufficient for a long time, and the dependence on foreign iron ore has been increasing. However, in recent years, the price of imported high-quality iron ore has continued to rise, which has led to an increasingly prominent contradiction in the shortage of raw materials for the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/00C21B13/00C22B1/02C21C1/02
Inventor 张竹明徐楚韶罗明发叶亚雄陈登福栗伟孙善长雷云郑福生唐美锡张洪彪
Owner KUNMING IRON & STEEL HLDG CO LTD
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