Novel spherical MgO-CaO metallurgy accessory for blast furnace

A blast furnace and spherical technology, which is applied in the field of metallurgical auxiliary materials, can solve the problems of poor air permeability of blast furnace, abnormal blast furnace condition, and reduced carbon efficiency, and achieve the effects of improving quality, increasing heat energy consumption, and increasing compressive strength.

Inactive Publication Date: 2012-09-05
崔涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Putting dolomite or magnesite directly into the blast furnace, the carbon dioxide generated during the thermal decomposition process will take away the heat energy and part of the carbon monoxide, resulting in a decrease in carbon efficiency and a significant increase in the coke ratio, which will bring greater harm to environmental protection. pressure
Moreover, the strength of dolomite or light-burned magnesite after light burning is low, and it is easy to pulverize prematurely, which will make the air permeability of the blast furnace worse, resulting in abnormal conditions of the blast furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: According to the requirements and technical conditions of the ironworks blast furnace, by weight percentage, active magnesium oxide is 65%, binder is 5%, lightly burned magnesia calcium powder 15%, granular magnesium oxide is 15% and mix evenly Then put it into the mold and press it mechanically to be a spherical auxiliary material. The pressing pressure is 45kPa, the temperature is 50°C, and the drying time after pressing is ≥36 hours.

[0013] The tested MgO content is 60%, SiO 2 The content of CaO is 8%, the content of CaO is 6%, the content of binder and other components is 26%, the size of metallurgical auxiliary materials is about 40mm, and the compressive strength at room temperature is 1500N balls (blocks).

[0014] Effects: 1. Transferring the overloaded MgO in the sinter directly to the blast furnace can increase the output of the sinter by 10%, improve the quality, and reduce the fuel consumption by 8kg / t.

[0015] 2. Adding this metallurgica...

Embodiment 2

[0016] Embodiment 2: According to the requirements and technical conditions of the blast furnace in the ironworks, 82% of active magnesium oxide, 10% of lightly burned magnesium calcium powder, 3% of binder, and 5% of granular magnesium oxide were added by weight percentage. After mixing evenly, put it into a mold and press it mechanically to form a spherical auxiliary material. The pressing pressure is 50kPa, the temperature is 65°C, and the drying time after pressing is ≥36 hours.

[0017] The detected MgO content is 63.5%, SiO 2 The content of CaO is 5.2%, the content of CaO is 3.6%, the content of binder and other components is 27.7%, the size of metallurgical auxiliary materials is about 40mm, and the compressive strength at room temperature is 1800N balls (blocks).

Embodiment 3

[0018] Embodiment 3: According to the requirements and technical conditions of the blast furnace in the ironworks, 90% of active magnesium oxide, 2% of binder, and 8% of granular magnesium oxide were added by weight percentage. After mixing evenly, put it into a mold and press it mechanically to form a spherical auxiliary material. The pressing pressure is 40kPa, the temperature is 40°C, and the drying time after pressing is ≥36 hours.

[0019] The detected MgO content is 75%, SiO 2 The content of CaO is 2.5%, the content of CaO is 1.5%, the content of binder and other components is 21%, the external dimension of the metallurgical auxiliary material is about 50mm, and the compressive strength at room temperature is 3500N balls (blocks).

[0020] The citric acid activity of the activated magnesium oxide in the above examples, that is, the CAA value is less than 12-25s, and the fineness is 80-200 mesh. The adhesive adopts any commercially available composite adhesive. The part...

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Abstract

The invention relates to a metallurgy accessory for an ironmaking blast furnace, and concretely relates to a novel spherical MgO-CaO metallurgy accessory for a blast furnace. The metallurgy accessory is obtained by adding a certain proportion of a binder to active MgO, light-burnt Mg-Ca powder, and particulate MgO, uniformly mixing them, and compression-molding them by mechanical force. The novelspherical MgO-CaO metallurgy accessory for the blast furnace of the invention, which allows comprehensive metallurgy performances of slag to be improved, the wind resistance of the blast furnace to be alleviated, heat energy consumption to be not increased, and energy saving and consumption reduction to be realized, is in favor of the smelting operation performance of the blast furnace. So the slag has a good fluidity, and the smelting speed and the steel quality are improved.

Description

technical field [0001] The invention relates to a metallurgical auxiliary material used in ironmaking blast furnaces, which is a spherical blast furnace environment-friendly MgO- CaO-based metallurgical auxiliary materials. 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. By increasing the magnesium oxide content in the slag, the fluidity and stability of the slag can be improved, the comprehensive metallurgical properties of the slag can be improved, and it can play a very good role in reducing the silicon content of pig iron. The content of magnesia in the blast furnace slag of most iron and steel enterprises in China comes from the magnes...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21B5/00
Inventor崔涛
Owner崔涛