Molded magnesium filler for blast furnace

A technology of blast furnace and magnesia, which is applied in the field of fillers, can solve problems such as the decrease of sintering machine productivity, poor air permeability of blast furnace, abnormal blast furnace condition, etc.

Inactive Publication Date: 2012-05-02
陶明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesium oxide content in the blast furnace slag of most iron and steel enterprises in China is directly determined by the magnesium oxide content of the sinter. If the requirements for the magnesium oxide content of the blast furnace are to be met, the quality of the finished product of the sintered ore cannot be guaranteed, and the productivity of the sintering machine will be greatly reduced.
[0003] Directly put dolomite or magnesite (the main components are calcium carbonate and magnesium carbonate) into the blast furnace, and the carbon dioxide generated during its thermal decomposition will take away heat energy and part of carbon monoxide, resulting in a decrease in carbon efficiency and a significant increase in coke ratio High, bringing greater pressure to environmental protection
Moreover, the strength of dolomite or magnesite after light burning is relatively low, and it is easy to pulverize prematurely, which will deteriorate the air permeability of the blast furnace and cause abnormal conditions of the blast furnace

Method used

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Effect test

specific Embodiment 2

[0020] According to the requirements and technical conditions of the blast furnace in the iron factory, the formula data used is 80% lightly burned magnesium powder, 5% binder, 8% granular magnesium oxide, and 7% water. After mixing evenly, it is mechanically pressed into active high-magnesium balls for blast furnaces: MgO content is 63.5%, SiO 2 content of 5.2%, CaO content of 3.6%, H 2 The content of O is 5%, the content of binder and other components is 22.7%, the shape of magnesium is about 40mm, and the compressive strength at room temperature is 1800N balls (blocks).

specific Embodiment 3

[0021] According to the requirements and technical conditions of the blast furnace in the iron factory, the formula data used is 90% lightly burned magnesium powder, 1% binder, 2% granular magnesium oxide, and 7% water. Active high-magnesium balls for blast furnaces after mechanical pressing: MgO content is 80%, SiO 2 content of 2.5%, CaO content of 1.5%, H 2 The content of O is 3%, the content of binder and other components is 14%, the shape of magnesium alloy is about 55mm, and the compressive strength at room temperature is 3500N balls (blocks).

[0022] The content of magnesia is based on 60%. For every 2% increase in magnesia content, the grade of sinter will increase by 0.1%, the strength will increase by more than 0.5%, the output will increase by 0.1%, and the blast furnace will reduce the coke ratio by more than 2 kg. Elimination of A1 in slag 2 o 3 The adverse effects on blast furnace production can improve the fluidity of slag, increase the desulfurization capaci...

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Abstract

The invention relates to a molded magnesium filler for a blast furnace. By the filler, the comprehensive metallurgical property of furnace slag can be improved, the wind resistance of the blast furnace is reduced, heat energy consumption is not increased, energy is saved, consumption is reduced, and the smelting operation performance of the blast furnace is better exerted. The filler is characterized by being prepared by putting 75 to 90 percent, preferably 85 percent of light burned magnesium powder, 1 to 5 percent, preferably 3 percent of binder, 5 to 10 percent, preferably 7 percent of water and 4 to 10 percent, preferably 5 percent of granular magnesium oxide into a mixing machine, uniformly mixing, and performing compression molding.

Description

technical field [0001] The invention relates to a filler used in ironmaking blast furnaces, in particular to an oblate spherical blast furnace energy-saving filler which is composed of lightly burned magnesium powder, a certain proportion of binder, and granular magnesium oxide to increase mechanical strength. Increase production of high-strength magnesium fillers. Background technique [0002] In recent years, as the price of iron ore continues to rise, the low-cost foreign ore in the ore blending of domestic iron and steel enterprises has increased year by year. The increase in impurities has made it difficult to operate the blast furnace. , the fluidity of the slag becomes poor, and the thermal stability and desulfurization ability decrease. Metallurgists at home and abroad have found that appropriately increasing the magnesia content of slag plays a very good role in improving the fluidity and stability of slag, improving the comprehensive metallurgical properties of sl...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B35/66
Inventor陶明
Owner陶明