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Preparation method of high-purity molten iron

A molten iron, high-purity technology, applied in the field of preparation of high-purity molten iron, can solve the problems of long smelting process and high energy consumption, and achieve the effect of improving smelting efficiency, high energy consumption and shortening the process flow

Active Publication Date: 2022-03-01
临沂市钢铁产业协同创新中心 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a method for preparing high-purity molten iron to solve the technical problems of long smelting process and high energy consumption during the existing high-purity molten iron smelting

Method used

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  • Preparation method of high-purity molten iron

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preparation example Construction

[0032] The present invention also provides a method for preparing high-purity molten iron, the method comprising the following steps:

[0033] Step 1. Add industrial pure iron into the vacuum induction furnace as the induction heating medium, heat and melt under vacuum at 50-100 Pa, and set the melting temperature to 1550-1700 ° C; then add iron concentrate powder and lime flux;

[0034] Step 1. At the beginning, put industrial pure iron as the induction heating medium into the vacuum induction furnace, heat and melt under the condition of 50-100Pa and 1550-1700°C in a vacuum state, and form a molten iron pool after melting;

[0035] Step 2. Continuously spray the iron concentrate powder and lime flux into the molten iron pool in step 1 for melting pre-reduction, and form a melt after melting and pre-reduction; The hydrogen injection unit at the bottom of the furnace sprays hydrogen into the molten iron pool, and the hydrogen reacts with the melt in the molten iron pool for sm...

Embodiment 1

[0072] This example is used to illustrate the influence of smelting temperature on oxidative desulfurization and pre-reduction. Among them, the composition of the selected iron concentrate powder is shown in Table 1, the total iron content is 67%, and the sulfur and phosphorus contents are both 0.01%. Using CaO pure chemical reagent as flux, iron concentrate powder and calcium oxide are mixed according to the ratio of binary alkalinity to 3.0.

[0073] Table 1 Iron Concentrate Powder Composition

[0074] Element TF FeO Fe 2 o 3

al 2 o 3

CaO MgO SiO 2

P S content,% 67 1.04 94.6 0.64 0.89 0.68 2.61 0.03 0.01

[0075] Add 10kg of industrial pure iron into a vacuum induction furnace with a capacity of 50kg as an induction heating medium, and heat and melt it in a vacuum state to form a molten iron pool. The melting temperature is set to 1550-1700°C. After the pure iron is completely melted, spray 10kg of the mixture of ...

Embodiment 2

[0085] This example is used to illustrate the effect of slag basicity on the sulfur and oxygen content of molten iron, wherein iron concentrate powder and calcium oxide flux are mixed according to the ratio of binary basicity 2.0, 2.5, 3.0, 3.5. After the pre-reduction is carried out according to the same procedure as above, pure hydrogen is injected into the molten pool through a hydrogen spray gun for final reduction, and the amount of hydrogen injected is according to H 2 The / FeO molar ratio is controlled at 2, the injection time is 30min, and the melting temperature is 1650°C. After reaching the reduction reaction time, the sulfur content and oxygen content of the molten iron were measured by a carbon-sulfur analyzer and chemical analysis, and the results are shown in Table 3.

[0086] It can be seen that the increase of slag alkalinity has a favorable impact on both desulfurization and deoxidation of molten iron. When the alkalinity is controlled above 2.5, the sulfur an...

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Abstract

The invention discloses a preparation method of high-purity molten iron, belongs to the technical field of smelting of iron ore concentrate powder, and solves the technical problems of long smelting process and high energy consumption during preparation of the high-purity molten iron in the prior art. The preparation method of the high-purity molten iron comprises the steps that 1, industrial pure iron is added into a vacuum induction furnace to serve as an induction heating medium, and a molten iron melting pool is formed; 2, iron ore concentrate powder and lime flux are mixed and then sprayed into a molten iron bath; then hydrogen is sprayed into a molten iron bath, the hydrogen and the melt are subjected to a reduction reaction, slag generated by reduction floats upwards to enter a slag layer, and molten iron generated by reduction enters a molten iron layer; and 4, when the molten iron meets the tapping requirement, hydrogen injection is stopped, argon is injected into the molten iron layer through the argon injection unit, vacuum stirring degassing is carried out through argon, tapping is carried out after degassing, and the high-purity molten iron is obtained. According to the method, high-purity molten iron is prepared in a short process, and the smelting cost is reduced.

Description

technical field [0001] The invention relates to the technical field of iron concentrate powder reduction and smelting, in particular to a method for preparing high-purity molten iron. Background technique [0002] As the basic industry of the national economy, the iron and steel industry shoulders the heavy responsibility of the country's basic material production. 90% of my country's crude steel is produced through the long process of "iron ore-sintering (or pelletizing)-blast furnace ironmaking-steelmaking", which has high energy consumption and serious pollution. In 2020, my country's CO 2 The emission of more than 12 billion tons, the steel industry CO 2 Emissions account for 15% of the country's emissions, reaching 1.8 billion tons, and the ironmaking process CO 2 Emissions account for 73.1% of the entire steel production process, exceeding 1.3 billion tons. Therefore, the green transformation of the iron and steel industry, especially the ironmaking field, is impera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C21B13/12
CPCC21B13/12C21B13/0073
Inventor 张俊沈朋飞周和敏王锋何鹏徐洪军
Owner 临沂市钢铁产业协同创新中心
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