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Method for preparing low-phosphorus and low-titanium molten iron by mixed-smelting high-phosphorus iron ore and titanic iron ore 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 heavy pollution, low thermal efficiency, and high energy consumption of blast furnace ironmaking technology

Inactive Publication Date: 2012-11-21
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

Method used

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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) crushed powder (≤10mm), the ratio of Huimin mine and Mengqiao concentrate is 4:6, according to the alkalinity of 1.1, The process parameter ratio of carbon ratio C / O is 1.0 is mixed, put into the crucible, and then put the crucible into the electric furnace, the furnace temperature is controlled at 1550℃, and the molten iron result obtained under the condition of oxygen-rich top blowing: iron The recovery rate is about 92%, the phosphorus content in pig iron is about 0.18%, and the sulfur content is 0.05%. ...

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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 greatnumber 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 smelting high phosphorus iron ore and ilmenite by using oxygen-rich top blowing smelting reduction technology, and 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, many lean ore, few rich ore, and many symbiotic components in iron ore deposits. Among the 1,834 iron ore identified, the total proved reserves are 53.14 billion tons, and the retained reserves are 50.12 billion tons. Among them, the retained reserves of high-phosphorus iron ore are 7.45 billion tons, accounting for 14.86 of the total national iron ore reserves. %. The high-phosphorus iron ore that I have visited is mainly distributed in Yunnan, Sichuan, Hubei, Hunan, Anhui, Jiangsu, and Inner Mongolia in northern China in the Yangtze River Basin. It has a wide distribution and large reserves, but its mineral composition is complex and ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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