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Carbothermy-based hot metal pretreatment in-situ desulphurization method for magnesite-based desulfurizers

A technology of molten iron pretreatment and desulfurization agent, which is applied in the field of molten iron pretreatment, can solve the problems of high energy consumption and environmental pollution, and achieve the effects of simplified desulfurization process, wide resources and low cost

Inactive Publication Date: 2017-05-10
UNIV OF SCI & TECH LIAONING
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production process of traditional metal magnesium consumes a lot of energy and pollutes the environment

Method used

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  • Carbothermy-based hot metal pretreatment in-situ desulphurization method for magnesite-based desulfurizers
  • Carbothermy-based hot metal pretreatment in-situ desulphurization method for magnesite-based desulfurizers
  • Carbothermy-based hot metal pretreatment in-situ desulphurization method for magnesite-based desulfurizers

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Embodiment

[0023] The carbothermal magnesite-based desulfurizer molten iron pretreatment in-situ desulfurization method is completed according to the following steps:

[0024] a. The molten iron raw material used is blast furnace pig iron, and the sulfur content is adjusted with ferrous sulfide. Weigh 200g of pig iron with initial sulfur content of 0.2%, 0.3%, 0.35%, and 0.4%, respectively, and put them into a 300°C electric blast drying oven Dry at constant temperature for 2 hours;

[0025] b. Prepare magnesite-based desulfurizer according to mass percentage, and its proportion is as follows: MgO 38%, graphite powder 11%, Al12%, Fe 2 o 3 33%, SiO 2 +CaO 5.3%, CaF 2 0.7%, grind the components separately, mix them and put them in a 300°C electric blast drying oven for 2 hours to dry at a constant temperature; wrap 20g of the prepared desulfurizer with rice paper and set aside;

[0026] c. Turn on the high temperature resistance furnace program control device, set parameters: heating...

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Abstract

The invention relates to a carbothermy-based hot metal pretreatment in-situ desulphurization method for magnesite-based desulfurizers. According to the method, metal magnesium steam obtained through reduction of magnesite is directly subjected to hot metal pretreatment desulphurization without condensation, so that energy is saved, environment is protected, and cost is reduced; the magnesite-based desulfurizers are fed into hot metal with the temperature of 1400-1500 DEG C for desulphurization, the weight ratio of the magnesite-based desulfurizers to pig iron is 1:10, and magnesium steam, generated through reduction of magnesium oxide and carbon in the magnesite-based desulfurizers, desulfurizes the hot metal directly. The carbothermy-based hot metal pretreatment in-situ desulphurization method has the advantages that the magnesite, extensive in source and low in cost, is utilized, so that high-quality and high-purity magnesium powder is saved, and process is simplified.

Description

technical field [0001] The invention relates to the field of molten iron pretreatment, in particular to an in-situ desulfurization method for pretreatment of molten iron with a carbothermal magnesite-based desulfurizer. Background technique [0002] Sulfur in most steels will affect its quality and reduce the utilization value of steel. Sulfur mainly exists in steel in the form of sulfide, which is the most common non-metallic inclusion. When the sulfur content is high, the processing performance and serviceability of the steel will be greatly reduced, and even "hot embrittlement" will occur during the heating production process, causing the steel to break. In recent years, low-sulfur steel has become more and more popular and has a good market prospect. Low sulfur steel has very good mechanical properties, very good corrosion resistance and excellent weldability. Hot metal pretreatment desulfurization is an important means of producing low-sulfur steel and an important pa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
CPCC21C7/0645C21C1/025
Inventor 刘坤邢飞张海涛吕汶璋周爽
Owner UNIV OF SCI & TECH LIAONING
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