Method for lowering high-vanadium-titanium molten iron blowing desulfurization drossing iron loss

A technology of desulfurization slag and molten iron, applied in the field of iron and steel metallurgy, can solve the problems of increasing smelting cost, increasing cost burden, and expensive cryolite, and achieve the effect of reducing steel material consumption, reducing smelting cost, and improving slag state

Inactive Publication Date: 2017-01-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cryolite is expensive, which will greatly increase the cost of smelting and increase the cost burden of the enterprise. Therefore, it is necessary to develop a new process to reduce the iron loss in the process of removing slag from molten iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. The weight percentage of molten iron before desulfurization is controlled at: C 3.9%, Mn 0.33%, V 0.50%, Si 0.40%, S 0.12%, P 0.05%, Ti 0.30%, and the remainder is iron and unavoidable impurities. The temperature of molten iron before desulfurization is 1340°C.

[0020] 2. Before desulfurization, argon gas is used as the carrier, and Ca+Mg powder is used as the desulfurizing agent for blowing desulfurization.

[0021] 3. Add slagging agent to the molten iron at a rate of 0.8kg per ton of iron and stir, and then desulfurize.

[0022] 4. After the desulfurization is completed, at one end of the molten iron slag surface of the slag removal station, install 2 air jet guns to blow the argon gas at a pressure of 4atm and 60Nm 3 The flow rate of / h is sent into molten iron, and the insertion depth is controlled at 150mm.

[0023] 5. Remove slag from the desulfurized molten iron. When the remaining amount of desulfurized slag is 1 / 4 of the original desulfurized slag, add a...

Embodiment 2

[0027] 1. The composition weight percentage of molten iron before desulfurization is controlled at: C 4.2%, Mn 0.25%, V 0.35%, Si 0.20%, S 0.08%, P 0.09%, Ti 0.22%, the remainder is iron and unavoidable impurities; before desulfurization The temperature of molten iron is 1290°C.

[0028] 2. Before desulfurization, the nitrogen-argon mixed gas is used as the carrier, and Ca+Mg powder is used as the desulfurizing agent for desulfurization, and the volume ratio of argon in the nitrogen-argon mixed gas is 65%.

[0029] 3. Add slagging agent to molten iron at a rate of 0.5kg per ton of iron and stir, then desulfurize.

[0030] 4. After the desulfurization is completed, at one end of the molten iron slag surface of the slag removal station, install 4 air jet guns to inject nitrogen and argon mixed gas at a pressure of 8atm and 100Nm 3 The flow rate of / h is sent into molten iron, and the insertion depth is controlled at 100mm.

[0031] 5. Remove slag from the desulfurized molten i...

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PUM

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Abstract

The invention provides a method for lowering high-vanadium-titanium molten iron blowing desulfurization drossing iron loss. Before desulfurization, the contents of C, Mn, V, Si, S, P, Ti in molten iron and the temperature of the molten iron are controlled; argon or nitrogen-argon mixed gas is adopted as a carrier, and Ca and Mg powder is adopted as a desulfurizer for blowing desulfurization; and a slag-modifier is added into the molten iron according to a ratio of 0.3-0.8 kg per ton of iron for desulfurization. After desulfurization, the argon or nitrogen-argon mixed gas is introduced into the molten iron; drossing is performed until 1 / 4-1 / 3 of slags remain; and then the slag-modifier is added into the molten iron according to a ratio of 0.2-0.5 kg per ton of iron, and then drossing is performed until the slags are totally removed. After the slags are totally removed, the molten iron comprises the contents of 3.9-4.5% of C, 0.10-0.33% of Mn, 0.24-0.49% of V, 0.10-0.4% of Si, 0.001-0.004% of S, 0.05-0.16% of P and 0.10-0.30% of Ti, and the temperature of the molten iron is 1240-1320 DEG C. By adopting the method, the slag status of the desulfurization slags of the molten iron can be greatly improved; the high-vanadium-titanium molten iron blowing desulfurization drossing iron loss and steel and iron consumption are effectively reduced; and the smelting cost of enterprises is lowered.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for reducing the loss of slag and slag removal by injection desulfurization of high-vanadium-titanium molten iron. Background technique [0002] Affected by the financial crisis, the profits of iron and steel enterprises have generally declined, and cost reduction and efficiency increase have become a new profit growth point, while the cost of slag removal of molten iron accounts for 20-30% of the cost of steel materials, and the removal loss has directly affected the cost control of steel materials. [0003] The use of titanium balls or titanium ore improves the life of the blast furnace, resulting in an increase in the titanium content of the molten iron. When the molten iron is pretreated for desulfurization, if the titanium content is high (greater than 0.05%), the carrier gas nitrogen of the magnesium-calcium composite injection and the ...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C7/064
Inventor 王晓峰方敏赵正洪
Owner ANGANG STEEL CO LTD
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