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Low-titanium ferrophosphorus, preparation method and application

A high-titanium-phosphorus and titanium-phosphorus technology is applied in the field of pure ferroalloy smelting and production, which can solve the problems of high titanium content and inability to meet the production requirements of high-quality silicon steel, and achieve the effects of less environmental pollution, short process flow and simple process operation.

Active Publication Date: 2019-07-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the titanium content in ordinary ferrophosphorus is too high to meet the production requirements of high-quality silicon steel, and a low-titanium ferrophosphorus, preparation method and application are provided

Method used

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  • Low-titanium ferrophosphorus, preparation method and application
  • Low-titanium ferrophosphorus, preparation method and application
  • Low-titanium ferrophosphorus, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 500 kg of high-titanium ferrophosphorus and 33 kg of adsorption slag into an intermediate frequency induction furnace for melting. The components of the high-titanium ferrophosphorus used include: P: 25%, Si: 3%, C: 1%, S : 0.05%, Mn: 1%, Cr: 0.8%, Ti: 2.2%, and the balance is Fe. The composition of the adsorption slag includes by weight: MnO: 14%, SiO 2 : 27%, CaO: 32%, Al 2 o 3 :12%, CaF 2 : 9%, FeO: 6%.

[0051] After melting, the temperature is 1500K. After melting, nitrogen blowing is started for blowing. In the first stage of blowing, the gas blowing volume is 300 liters / 100 kg of ferrophosphorus, the flow rate is controlled at 100 liters / minute, and the blowing time is 15 minutes; In the second stage, the gas blowing volume is 50 liters / 100 kg of ferrophosphorus, the flow rate is controlled at 30 liters / minute, and the blowing time is 9 minutes.

[0052] After the blowing is completed, slag is removed and iron is tapped in a molten state to obtain 480 kg ...

Embodiment 2

[0057] Add 500 kg of high-titanium ferrophosphorus and 45 kg of adsorption slag into an intermediate frequency induction furnace for melting. The components of the high-titanium ferrophosphorus used include by weight: P: 23%, Si: 2%, C: 0.8%, S : 0.05%, Mn: 2%, Cr: 0.9%, Ti: 1.4%, and the balance is Fe. The composition of the adsorption slag includes by weight: MnO: 12%, SiO 2 : 28%, CaO: 32%, Al 2 o 3 : 10%, CaF 2 : 10%, FeO: 8%.

[0058] After melting, the temperature is 1590K. After melting, ammonia blowing is started for blowing. In the first stage of blowing, the gas blowing volume is 500 liters / 100 kg of ferrophosphorus, the flow rate is controlled at 150 liters / minute, and the blowing time is 17 minutes. In the second stage, the gas blowing volume is 70 liters / 100 kg of ferrophosphorus, the flow rate is controlled at 45 liters / minute, and the blowing time is 8 minutes.

[0059]After the blowing is completed, remove the slag and tap the iron in the molten state. The ...

Embodiment 3

[0063] 500 kg of high-titanium ferrophosphorus and 62.5 kg of adsorption slag were added to an intermediate frequency induction furnace for melting. The components of the high-titanium ferrophosphorus used included by weight: P: 23%, Si: 2%, C: 0.8%, S : 0.05%, Mn: 2%, Cr: 0.9%, Ti: 1.4%, and the balance is Fe. The composition of the adsorption slag includes by weight: MnO: 12%, SiO 2 : 26%, CaO: 31%, Al 2 o 3 : 12%, CaF 2 : 9%, FeO: 10%.

[0064] After melting, the temperature is 1650K. After melting, ammonia blowing is started for blowing. The first stage of blowing is 800 liters / 100 kg of high-titanium ferrophosphorus. The flow rate is controlled at 200 liters / minute, and the blowing time is 20 minute. In the second stage, the gas blowing volume is 100 liters / 100 kg high-titanium ferrophosphorus, the flow rate is controlled at 50 liters / minute, and the blowing time is 10 minutes.

[0065] After the blowing is completed, 470 kg of low-titanium ferrophosphorus with a tit...

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Abstract

The invention discloses low-titanium ferrophosphorus, a preparation method and application. The method comprises the following steps of adding high-titanium ferrophosphorus and adsorption slag into acontainer for melting to obtain a molten product; blowing nitrogen or ammonia gas into the melt from the bottom of the container under the condition of 1500-1650K for blowing; after blowing is finished, deslagging and tapping in a molten state to obtain low-titanium ferrophosphorus, wherein the high-titanium ferrophosphorus comprises the following components, by weight, 22-28% of P, smaller than or equal to 3% of Si, smaller than or equal to 1% of C, smaller than or equal to 0.05% of S, smaller than or equal to 2% of Mn, smaller than or equal to 1% of Cr, 0.1-4% of Ti, and the balance Fe. Theprepared low-titanium ferrophosphorus composition comprises, by weight, 23-25% of P, 1.7-2.8% of Si, 0.8-0.9% of C, 0.05-0.08% of S, 0.8-1.7% of Mn, 0. 6-0.8% of Cr, less than 0.05% of Ti, and the balance Fe. The process flow for preparing the low-titanium ferrophosphorus is short, the process operation is simple, the environmental pollution is small, and the titanium content of the prepared low-titanium ferrophosphorus is less than 0.05%.

Description

technical field [0001] The invention belongs to the technical field of pure ferroalloy smelting and production, and in particular relates to a low-titanium phosphorus iron, a preparation method and an application. Background technique [0002] High-quality silicon steel with excellent electromagnetic properties needs to reduce the titanium content in the product as much as possible, because titanium and carbon, oxygen, nitrogen and other components in the steel will form fine titanium oxide, titanium nitride or titanium carbide that are difficult to discharge Inclusions, thereby reducing the cleanliness of molten steel, inhibiting grain growth during annealing, and reducing the electromagnetic properties of silicon steel products. [0003] Since phosphorus can improve the castability of silicon steel, etc., silicon steel usually contains relatively high phosphorus. Ferrophosphorus is commonly used as an additive for phosphorus in the production of silicon steel. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C35/00C22C33/04C22C38/34C22C38/04C22C38/38C22C38/28C22C38/60
CPCC22C33/04C22C35/005C22C38/002C22C38/04C22C38/28C22C38/34C22C38/38C22C38/60
Inventor 章俊丁德胜孟令辉王美晨尹振兴肖赛君范鼎东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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