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Composite dephosphorizing agent for tapping after furnace, preparation method and application

A composite dephosphorization agent and post-furnace technology, applied in the field of metallurgy, can solve the problems of unconsidered, limited contact area between dephosphorization flux and molten steel, etc., and achieve the effects of short reaction time, obvious phosphorus fixation effect, and obvious use effect.

Inactive Publication Date: 2021-06-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention does not consider the active addition of materials such as silicon dioxide necessary for the solid phosphorus phase. The composite dephosphorization agent is a sphere, and the contact area between the dephosphorization flux and the molten steel is limited, and the use of the sintered flux for dephosphorization is not considered. The formula needs to be further optimized in order to achieve better dephosphorization effect

Method used

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  • Composite dephosphorizing agent for tapping after furnace, preparation method and application
  • Composite dephosphorizing agent for tapping after furnace, preparation method and application
  • Composite dephosphorizing agent for tapping after furnace, preparation method and application

Examples

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Effect test

Embodiment 1

[0032] Described sintering dephosphorization powder takes CaO 40kg according to formula ratio, SiO 2 10kg, Fe 2 o 3 10kg, CaF 2 5kg, put into a crusher for crushing and grinding to a powder with a particle size of 1mm. Put the above-mentioned powder and 5 kg of binder into a mixer for thorough mixing, and the mixing time is 2 hours. After fully mixing, use a sintering machine to sinter at a temperature of 800°C for 6 hours. The binder is prepared by mixing 30% clay, 30% water glass and 40% bentonite according to the formula. Put the sintered particles into the crushing and grinding machine again for secondary crushing and grinding. The grinding time is 2.5 hours to obtain a powder with a particle size of less than 2 mm. Put the secondary crushed powder into a dryer for drying, the drying temperature is 100°C, and the drying time is 7 hours. After cooling to room temperature, pack it in bags, each bag is 20kg, and use it within one month. Adding 4kg / ton of this produc...

Embodiment 2

[0034] The formula of the mechanical mixing powder dephosphorization agent is to take CaCO 3 20kg, CaO 50kg, SiO 2 15kg and 15kg of FeO were prepared, put into a crusher for fully crushing and mixing, the crushing and mixing time was 2 hours, and the powder was screened by sieving to obtain a dephosphorization agent powder with a particle size of 1.5mm. Use a dryer to dry the above dephosphorizing agent powder at a temperature of 120°C for 6 hours. After cooling to room temperature, pack it into bags of 30kg each and use it within one month. Adding 5kg / ton of this product in the tapping process after the furnace can reduce the phosphorus content in molten steel from 0.014% to 0.0045%.

Embodiment 3

[0036] The formula of the mechanical mixing powder dephosphorization agent is to take CaCO 3 10kg, MgCO 3 10kg, CaO 50kg, SiO 2 15kg, Fe 2 o 3 15kg for preparation, put into a crusher for fully crushing and mixing, the crushing and mixing time is 1 hour, and the powder is screened by sieving to obtain a dephosphorizing agent powder with a particle size of 2mm. Use a dryer to dry the above-mentioned dephosphorizing agent powder at a temperature of 150°C for 8 hours. After cooling to room temperature, pack it in bags of 40kg each and use it within one month. Adding 4.5kg / ton of this product in the tapping process after the furnace can reduce the phosphorus content in molten steel from 0.013% to 0.005%.

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Abstract

The invention belongs to the technical field of metallurgy, and discloses a composite dephosphorizing agent for tapping after a furnace, a preparation method and application. The composite dephosphorizing agent is powdery and is divided into a sintering powder form and a mechanical mixed powder form; and the raw materials in the two forms comprise, by weight, 0%-60% of calcium carbonate, 0%-60% of magnesium carbonate, 1%-80% of calcium oxide, 1%-30% of ferric oxide or ferrous oxide or a mixture of the ferric oxide and the ferrous oxide, 1%-30% of silicon dioxide and 0%-30% of calcium fluoride. In the tapping process of a converter or an electric furnace, composite dephosphorization powder is added, good reaction kinetics and thermodynamics conditions are utilized, the purpose of deep dephosphorization is achieved, the technology for producing ultra-low phosphorus steel through a single-slag method is improved, and the smelting cost is reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy technology. The invention relates to a control method for assisting the single slag method in producing ultra-low phosphorus steel, in particular to a composite dephosphorization method applied to the production of ultra-low phosphorus steel in the single slag method converter or electric furnace tapping process agent and its preparation method. Background technique [0002] Phosphorus in steel will segregate at low temperature, reducing the low temperature toughness of steel, resulting in cold and brittle problems. High-quality steel requires extremely high phosphorus content, such as marine steel, ultra-low temperature steel requires a phosphorus content of less than 0.010%, and high-quality pipeline steel even requires a phosphorus content of less than 0.005%. [0003] In recent decades, the United States, Japan and other countries have carried out extensive research on the production of ultra-low ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
CPCC21C7/0645
Inventor 邓志银闫子文禹绍鸿朱苗勇
Owner NORTHEASTERN UNIV
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