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Method for preparing low-phosphorus and low-titanium molten iron by mixed-smelting high-phosphorus iron ore and ilmenite by oxygen-rich top-blowing smelting reduction technology

A high-phosphorus iron ore and oxygen-enriched top blowing technology, applied in the field of energy and metallurgy, can solve the problems of high energy consumption of blast furnace ironmaking technology, difficulty in smelting large reserves of lean iron ore, and large pollution

Inactive Publication Date: 2011-05-11
KUNMING UNIV OF SCI & TECH
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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

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  • Method for preparing low-phosphorus and low-titanium molten iron by mixed-smelting high-phosphorus iron ore and ilmenite by oxygen-rich top-blowing smelting reduction technology
  • Method for preparing low-phosphorus and low-titanium molten iron by mixed-smelting high-phosphorus iron ore and ilmenite by oxygen-rich top-blowing smelting reduction technology
  • Method for preparing low-phosphorus and low-titanium molten iron by mixed-smelting high-phosphorus iron ore and ilmenite by oxygen-rich top-blowing smelting reduction technology

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Embodiment

[0093] 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), Mengqiao concentrate (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 (≤10mm), the ratio of Huimin mine and Mengqiao concentrate is 4:6, according to the alkalinity of 1.1, The carbon ratio C / O is 1.0 and the process parameters are mixed evenly, put into the crucible, and then put the crucible into the electric furnace. The furnace temperature is controlled at 1550 ℃. The recovery rate reaches about 92%, the phosphorus content in the pig iron is about 0.18%, and the sulfur content is 0.05%. The oxygen enrichment concentration and the models of charge preheater, dust remover and gas co...

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Abstract

The invention discloses a method for producing molten iron under oxygen-rich top-blowing condition by taking mixed high-phosphorus iron ore and ilmenite as raw materials, coal dust as a reducing agent and lime stone or dolomite as a fluxing agent, which comprises the following process steps of: crushing charging materials which are the high-phosphorus iron ore, the ilmenite, the dolomite, lime and reduction coal; proportioning and uniformly mixing the charging materials according to process parameters comprising the alkalinity R of 1.0 to 2.0 and the inner C / O mole ratio of 0.9 to 1.3, and preheating the charging materials; and feeding the charging materials into a smelting reduction furnace from a furnace side, producing the molten iron with relatively lower phosphorus content and relatively lower titanium content under the oxygen-rich top-blowing condition, and periodically discharging the molten iron and slag from a tap hole and a bleed hole. In the invention, the high-phosphorus iron ore and the ilmenite difficult to smelt in a conventional method are treated. The mixed smelting reduces a phosphorus load in the smelting of the high-phosphorus iron ore, can obtain the molten iron with lower phosphorus content, reduces the amount of foamed slag in the smelting of the ilmenite, and is favorable for stabilizing furnace conditions. The method is favorable for developing a great number of high-phosphorus iron ore and ilmenite resources stored in China and enhancing the international competitive power of steel enterprises of China.

Description

technical field [0001] The invention relates to a method for mixing and smelting high-phosphorus iron ore and ilmenite by using the oxygen-enriched top-blown smelting reduction technology, which belongs to the technical field of energy and metallurgy. Background technique [0002] my country's iron ore resources are widely distributed, with various genetic types, more lean ore, less rich ore, and many symbiotic components in iron ore deposits. Among the 1,834 identified iron mines, the total proven reserves are 53.14 billion tons, and the reserved reserves are 50.12 billion tons. Among them, the reserved reserves of high-phosphorus iron ore are 7.45 billion tons, accounting for 1.486 billion tons of the total iron ore reserves in the country. %. The high-phosphorus iron ores I have seen are mainly distributed in Yunnan, Sichuan, Hubei, Hunan, Anhui, Jiangsu, and Inner Mongolia in North China in the Yangtze River Basin. They are widely distributed and have large reserves, bu...

Claims

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Application Information

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IPC IPC(8): C21B11/00
CPCY02P10/20
Inventor 王华李慧斌卿山郈亚丽李虎李幼灵张竹明杨雪峰
Owner KUNMING UNIV OF SCI & TECH
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