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Method for carrying alkali metal on top of blast furnace charge and device thereof

An alkali metal and blast furnace technology, applied in the field of loading alkali metal in blast furnace charge, can solve problems such as blast furnace deterioration, aggravate furnace condition deterioration, damage, etc., and achieve the effects of simple installation, solving test problems, and overcoming damage.

Inactive Publication Date: 2010-12-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Years of practice and research have shown that with the fluctuation of the quality of raw materials and fuels, when the alkali metal in the blast furnace reaches a certain amount, it will obviously damage the coke, sinter and pellets, aggravate the deterioration of the furnace condition, and make the blast furnace run worse

Method used

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  • Method for carrying alkali metal on top of blast furnace charge and device thereof
  • Method for carrying alkali metal on top of blast furnace charge and device thereof
  • Method for carrying alkali metal on top of blast furnace charge and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Weigh 1.5g of alkali metal K and 300g of coke, heat the temperature of the alkali metal loading device to 800°C at a heating rate of 7.5°C / min, keep the temperature for 10 minutes, and finally detect by chemical analysis. 2 The O content was 0.49%, and the alkali metal loading percentage was 85.4%.

Embodiment 2

[0027] Example 2: Weighing 3.5g of alkali metal Na and 700g of sinter, heating the temperature of the alkali metal loading device to 900°C at a heating rate of 7.5°C / min, keeping the temperature for 10 minutes, and finally testing by chemical analysis, and loading on the sinter. Na 2 The O content is 0.63%, and the alkali metal loading percentage is 91.02%.

Embodiment 3

[0028] Example 3: Weigh 1.75g ​​of alkali metal K, 1.75g ​​of alkali metal Na, and 700g of pellets, heat the alkali metal loading device to 900°C at a heating rate of 7.5°C / min, keep the temperature for 10 minutes, and finally pass chemical analysis Detection, K loaded on pellets 2 O content is 0.26%, Na 2 The O content is 0.30%, which corresponds to an alkali metal K loading percentage of 90.3%; an alkali metal Na loading percentage of 64.5%.

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Abstract

The present invention provides a method and a device for loading the alkali metals on the blast furnace charging, and belongs to the blast furnace iron smelting technology field. The device is arranged with a heating furnace, an alkali metals loading device containing a cooling device, and a vacuum system in turn. The alkali metals K or / and Na, and blast furnace charging, such as coke, sintered ore and pellet are loaded in the alkali metals loading device, which is put into the heating furnace after being sealed; the vacuum pumping pressure is kept in a curtain pressure range, and the Argon is charged to make the pressure in the loading device kept at 0Pa around; being heated to 800-900 DEG C by the heating furnace, using the characteristic of low melting point and low boiling point of the alkali metals of K or / and Na, by the vapor deposition, the alkali metals of K or / and Na are loaded on the surface of the charging, and under the action of oxygen, the loaded alkali metals of K or / and Na exist on the charging in the form of alkali metal oxide. The present invention is characterized in that the non damaging load of the alkali metals to the blast furnace radically overcomes the deterioration of the charging caused by the dipping means, and the shortcoming of late metallurgical properties testing by the dipping means.

Description

Technical field: [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method and a device for loading alkali metal in blast furnace charge. Background technique: [0002] The raw materials and fuels used in blast furnaces contain a certain amount of alkali metal potassium oxide (K 2 O) and alkali metal sodium oxide (Na 2 O), after being brought into the blast furnace, it is reduced by carbon at high temperature (1500 ° C ~ 2000 ° C), and becomes the vapor of metal potassium and sodium, which rises with the gas flow, and FeO and SiO in the falling charge 2 The components react and enter the high temperature zone to be reduced, thus forming the up and down circulation and enrichment of alkali metals in the blast furnace. Alkali metal is very harmful in blast furnace smelting. It can not only reduce the softening temperature of ore, cause the abnormal expansion of pellets and cause serious pulverization, strengthen th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/24
Inventor 李辽沙武杏荣周云傅元坤
Owner ANHUI UNIVERSITY OF TECHNOLOGY