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A kind of dephosphorization and desulfurization agent for semi-steel and its preparation method and application

A desulfurization agent and dephosphorization technology, applied in the field of iron and steel smelting, can solve the problems of less heating elements, difficult dephosphorization, and slagging difficulty, and achieve the effect of simple preparation method and cost saving

Active Publication Date: 2016-04-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the semi-steel obtained after vanadium extraction contains trace amounts of silicon and manganese, which results in slag formation and less heating elements during converter steelmaking, making slagging difficult and dephosphorization extremely difficult

Method used

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Examples

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Effect test

preparation example Construction

[0032] Further, the present invention also discloses a preparation method of the above-mentioned dephosphorization and desulfurization agent for semi-steel, including the following steps:

[0033] c. Mix the components according to the proportion to obtain the mixture;

[0034] d. Passivate the mixture with passivation liquid.

[0035] Further, in the step b, there is no specific requirement on the type and amount of passivation liquid. In short, the mixture can be passivated.

[0036] Further, in order to prevent moisture absorption, the above step a is carried out in a dry atmosphere, such as dry air, nitrogen, etc.; the potassium salt is sealed and packaged before use.

[0037] Further, the present invention also discloses the use of the above-mentioned dephosphorization and desulfurization agent for semi-steel in dephosphorization and desulfurization of semi-steel. As a preferred solution, the dosage is 5-7kg / t semi-steel.

[0038] Further, the present invention also discloses a sem...

Embodiment 1

[0046] Preparation of dephosphorization and desulfurization agent for semi-steel:

[0047] Mix 5kg of carbon powder, 15kg of calcium silicate, 5kg of sodium carbonate, 5kg of potassium chloride, 20kg of manganese dioxide, and 50kg of active lime and passivate with a passivation solution to obtain a dephosphorization and desulfurization agent for semi-steel.

[0048] Among them, the CaO content in passivated lime is 84%wt.

[0049] Use the above-mentioned dephosphorization and desulfurization agent for semi-steel to dephosphorize and desulfurize semi-steel:

[0050] After the vanadium extraction in the converter, the semi-steel that has not been desulfurized and dephosphorized is transported to the injection desulfurization station. Before desulfurization, the dephosphorization and desulfurization agent and passivation magnesium powder are respectively loaded into different tanks. The tanks are sealed with dry nitrogen. When the desulfurization spray gun drops below 100cm of the semi-s...

Embodiment 2

[0053] Preparation of dephosphorization and desulfurization agent for semi-steel:

[0054] Mix 5kg of carbon powder, 5kg of calcium silicate, 10kg of sodium carbonate, 5kg of potassium chloride, 20kg of manganese dioxide, and 55kg of active lime and passivate with a passivation solution to obtain a dephosphorization and desulfurization agent for semi-steel.

[0055] Among them, the CaO content in passivated lime is 82%wt.

[0056] Use the above-mentioned dephosphorization and desulfurization agent for semi-steel to dephosphorize and desulfurize semi-steel:

[0057] After the vanadium extraction in the converter, the semi-steel that has not been desulfurized and dephosphorized is transported to the injection desulfurization station. Before desulfurization, the dephosphorization and desulfurization agent and passivation magnesium powder are respectively loaded into different tanks. The tanks are sealed with dry nitrogen. When the desulfurization spray gun drops below 50cm of the semi-st...

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Abstract

The invention relates to a dephosphorization and desulfurization agent for semi-steel and a preparation method and application thereof, belongs to the field of steel and iron smelting and aims at providing a novel dephosphorization and desulfurization agent for semi-steel. The dephosphorization and desulfurization agent for the semi-steel is obtained by evenly mixing the following components through passivation, wherein the components include, by weight, carbon powder 5 parts, calcium silicate 5-15 parts, sodium carbonate 5-10 parts, potassium chloride 5-10 parts, manganese dioxide 10-20 parts and active lime 50-70 parts. Furthermore, the invention further discloses the preparation method of the dephosphorization and desulfurization agent for the semi-steel and application in semi-steel dephosphorization and desulfurization. The preparation method of the dephosphorization and desulfurization agent for the semi-steel is simple and capable of performing effective dephosphorization on the premise that the desulfurization rate can be ensured, less-slag steel making of a steel-making converter is facilitated, and cost is saved.

Description

Technical field [0001] The invention relates to a dephosphorization and desulfurization agent for semi-steel, a preparation method and application thereof, and belongs to the field of steel smelting. Background technique [0002] my country is a big country of vanadium-titanium magnetite. The molten iron smelted from vanadium-titanium magnetite blast furnace has higher vanadium content than ordinary molten iron, and vanadium is an important resource. Therefore, vanadium slag must be extracted from molten iron before steelmaking. The semi-steel silicon and manganese content obtained after vanadium extraction are all trace amounts, which results in slag formation and low heating elements during converter steelmaking, difficulty in slagging and extremely difficult dephosphorization. However, it is precisely because of this characteristic of semi-steel that it also provides good conditions for dephosphorization before the converter: it is not necessary to perform dephosphorization af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 陈炼戈文荪王建曾建华董克平黄正华李龙蒋龙奎杨森祥
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP