Method for manufacturing steelmaking converter steel slag deoxidization balls

A technology of steelmaking converter and manufacturing method, applied in the direction of manufacturing converters, etc., can solve the problems of difficult foaming slag, serious, deoxidizing addition of coke powder, etc., and achieve the goal of inhibiting the tendency of foaming slag, inhibiting the generation of foaming slag, and ensuring smooth discharge. Effect

Inactive Publication Date: 2018-11-20
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of difficult addition of coke powder for deoxidation and serious foam slag, the present invention provides a low-cost and effective manufacturing method for steelmaking converter steel slag deoxidation balls

Method used

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  • Method for manufacturing steelmaking converter steel slag deoxidization balls

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Comparison scheme
Effect test

Embodiment 1

[0024] A method for manufacturing steelmaking converter steel slag deoxidation balls, comprising the following steps:

[0025] Step (1) Select coke powder with a particle size of 1-3mm and fluorite powder with a particle size of 1-5mm and a calcium fluoride mass content of less than 70% as raw materials, and select water glass with a water content of 50% as a binder;

[0026] Step (2) Use coke powder, fluorite powder and water glass as raw materials, using a mass percentage of 78 : 20 : 2, use a ball press to press into a finished product with a diameter of 15mm, with a strength of 800N, and dry it naturally before use .

[0027] Load the deoxidation balls into the designated silo through the feeding belt. After reaching the silo, the powder rate is required to be less than 5%; the timing of adding the steelmaking slag deoxidation balls is selected: when the converter smelting is completed, the gun is lifted according to the expected end-point carbon content. The weighing sys...

Embodiment 2

[0029] A method for manufacturing steelmaking converter steel slag deoxidation balls, comprising the following steps:

[0030] Step (1) Select coke powder with a particle size of 1-3mm and fluorite powder with a particle size of 1-5mm and a calcium fluoride mass content of less than 65% as raw materials, and select water glass with a water content of 50% as a binder;

[0031] Step (2) Use coke powder, fluorite powder and water glass as raw materials, using a mass percentage of 72:25 : 3, use a ball press to press into a finished product with a diameter of 20mm, with a strength of 850N, and dry it naturally for use .

[0032] Load the deoxidation balls into the designated silo through the feeding belt. After reaching the silo, the powder rate is required to be less than 5%; the timing of adding the steelmaking slag deoxidation balls is selected: when the converter smelting is completed, the gun is lifted according to the expected end-point carbon content. The weighing system p...

Embodiment 3

[0034] (1) Production of steelmaking slag deoxidation balls

[0035] Coke powder, fluorite powder and binder are used as raw materials, according to a certain quality ratio, when the fluorite grade decreases, the fluorite ratio is appropriately increased. Use mixing equipment to mix, press into a finished product with a diameter of 18mm through a ball press, and dry naturally for use.

[0036] (2) Selection of timing for adding steelmaking slag deoxidation balls

[0037] At the end of converter smelting, when the torch is lifted, according to the expected end-point carbon content, the deoxidation balls are prepared in place through the weighing system of the blanking material, and added before the furnace is turned down.

[0038] (3) The addition amount of steelmaking steel slag deoxidation balls should be selected as shown in Table 1. The addition amount should be selected according to the predicted carbon when the converter is lifted. The effects of increasing the melting ...

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Abstract

The invention discloses a method for manufacturing steelmaking converter steel slag deoxidization balls. Coke powder, fluorite powder and a binder are used as raw materials, a mixing device is used for even mixing, the raw materials are pressed into finished products with the diameter being 15-20 mm through a ball pressing machine, and the finished products are naturally dried for standby use. After gun lifting of converter steelmaking, the deoxygenation balls are added into the converter through a feeding system, since the density of the deoxygenated balls is approximate to that of steel slag, the deoxygenated balls float on the surface of the steel slag, carbonaceous materials in the deoxygenated balls react with oxygen in steel, carbon dioxide is produced and removed, and the fluorite powder in the deoxidization balls can effectively inhibit formation of foam slag during the reaction. Compared with the deoxidization method, the steelmaking steel slag deoxidization balls do not causesecondary pollution during the deoxidization process, the manufacturing cost is low, molten steel is not polluted either, the manufacturing method is simple and rapid, and the metal loss in the steelmaking production process can be effectively reduced, the adding amount of light burnt dolomite is decreased, the corrosion resistance of a slag splashing protection layer is improved, thereby the steelmaking cost is reduced, and the quality of steelmaking molten steel is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production and relates to converter steel slag, in particular to a method for manufacturing steelmaking converter steel slag deoxidizing balls and an application thereof. Background technique [0002] In the current steelmaking production process, the converter steel slag is not pre-deoxidized, and this operation has the following defects: 1. The iron oxide in the converter steel slag without deoxidation is relatively high, resulting in a large metal loss during the smelting process and an increase in the consumption of steel materials. Due to the high iron oxide content in the deoxidized converter slag, the viscosity and melting point of the steel slag are relatively low, resulting in a decrease in the corrosion resistance of the slag splash layer, which is unfavorable for the longevity control of the converter. 3. The iron oxide content in the undeoxidized converter steel slag is high. The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C5/28
Inventor 魏国立朱青德
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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