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CN-122012866-A - Pre-melted conductive refining agent for steelmaking and preparation method thereof

CN122012866ACN 122012866 ACN122012866 ACN 122012866ACN-122012866-A

Abstract

The invention relates to the technical field of industrial solid waste, and discloses a premelting conductive refining agent for steelmaking and a preparation method thereof, wherein the premelting conductive refining agent comprises an electrorefining agent, the refining agent is prepared by smelting a raw material system containing hazardous waste aluminum ash, the mass content of metal aluminum in the aluminum ash is less than or equal to 15 percent, the content is combined with the smelting temperature range of 1300-1500 ℃ to avoid excessive oxidation of the metal aluminum and ensure the decomposition efficiency of aluminum nitride to be more than or equal to 99 percent.

Inventors

  • LIU JITANG
  • YUE YIHAN

Assignees

  • 刘继唐

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The premelted conductive refining agent for steelmaking comprises an electrorefining agent and is characterized in that the refining agent is prepared by smelting a raw material system containing hazardous waste aluminum ash, wherein the mass content of metal aluminum in the aluminum ash is less than or equal to 15 percent, and the content is combined with a smelting temperature range of 1300-1500 ℃ to avoid excessive oxidation of the metal aluminum and ensure that the decomposition efficiency of aluminum nitride is more than or equal to 99 percent; The raw materials for preparing the refining agent comprise, by weight, 40-70 parts of aluminum ash, 25-55 parts of calcareous materials and 1-10 parts of magnesia materials; The raw materials are smelted to form a refining agent, and the chemical components of the refining agent are 2-20% of Al 2 O 3 :35%-58%,CaO:30%-50%,MgO:1%-8%,SiO 2 ; The content of fluorine ions in the refining agent is less than or equal to 0.5 percent, and the content of nitrogen elements is less than or equal to 0.1 percent; and the mass percentage ratio of (CaO content + MgO content) to SiO2 content is 2.0-5.0.
  2. 2. The premelted electroconductive refining agent for steelmaking as claimed in claim 1, wherein the calcareous material is a mixture of carbide slag and papermaking white mud, and the mass ratio is 1 (0.8-1.2).
  3. 3. The pre-melted conductive refining agent for steelmaking as claimed in claim 1, wherein the magnesium material is a composite material of light burned magnesium powder and dolomite, and the mass ratio of the light burned magnesium powder is more than or equal to 60%.
  4. 4. A method for preparing a premelted conductive refining agent for steelmaking, which is applied to the premelted conductive refining agent for steelmaking as claimed in any one of claims 1 to 3, and is characterized by comprising the following steps: S1, raw material pretreatment, namely sieving aluminum ash, spraying and passivating by brine, and respectively drying and crushing calcareous materials and magnesian materials; s2, batching and mixing, namely accurately weighing and uniformly mixing 40-70 parts of aluminum ash, 25-55 parts of calcareous materials and 1-10 parts of magnesia materials; S3, smelting, namely putting the uniformly mixed materials into a smelting furnace, and smelting at the temperature of 1300-1500 ℃ for 0.5-2 hours; s4, forming and cooling, namely flowing out the completely melted material obtained in the step S3, and cooling to solidify the completely melted material; S5, crushing and screening, namely crushing and screening the cooled solid material to obtain a granular product with specified granularity.
  5. 5. The method of claim 4, wherein in step S1, the brine is MgCl 2 ·6H 2 O solution, and the amount of the MgCl 2 ·6H 2 O solution is 1% -3% of the mass of the aluminum ash, so as to inhibit adverse reactions of the aluminum ash in pretreatment and subsequent procedures.
  6. 6. The premelted electroconductive refining agent for steelmaking as claimed in claim 4, wherein in step S3, a protective gas is introduced into the melting furnace to maintain a reducing or neutral atmosphere in the furnace.
  7. 7. The method of producing a pre-melted conductive refining agent for steelmaking as claimed in claim 4, wherein in step S4, water quenching cooling is performed on the flowing melt with water flow having a pressure of 0.2-0.6MPa to achieve rapid solidification and granulation of the material.
  8. 8. The method of preparing a pre-melted conductive refining agent for steelmaking as claimed in claim 6, wherein in step S5, the particle size of the granular product is 5-40mm after the solid material is crushed and sieved.
  9. 9. The method for producing a premelted electroconductive refining agent for steelmaking as claimed in claim 6, wherein said protective gas is an inert gas.
  10. 10. The method for producing a pre-melted conductive refining agent for steel production according to claim 9, wherein the inert gas is nitrogen, argon or a mixture thereof.

Description

Pre-melted conductive refining agent for steelmaking and preparation method thereof Technical Field The invention relates to the technical field of industrial solid waste, in particular to a premelting conductive refining agent for steelmaking and a preparation method thereof. Background A large amount of aluminum ash (slag) generated in the aluminum smelting and processing process is listed in the national hazardous waste directory, the aluminum ash contains aluminum nitride, fluoride, chloride and other components, and is easy to react when meeting water to release harmful substances such as ammonia gas, if the aluminum ash is disposed in a piling or landfill mode, the aluminum ash is seriously threatening the environment and the safety, and meanwhile, the aluminum ash is rich in components such as alumina and the like and is a potential secondary resource; In the field of steelmaking and refining, the prior recycling of aluminum ash mainly has two ways, namely, firstly, simply treating the aluminum ash, then mixing the aluminum ash with lime and the like, pressing the aluminum ash into pellets or sintered blocks, and using fluorite as a deoxidizer, wherein the fluorite is used as a slag melting agent, however, the problems of low product melting speed, uneven components, low reaction efficiency and the like exist in the former, the deoxidization and desulfurization effects are unstable, hidden troubles of dust and ammonia release exist in the production process, and the latter is caused by increasingly deficient fluorite resources, fluoride ions are introduced in the smelting, so that environmental protection pressure is brought; Therefore, how to safely, efficiently and with high added value realize harmless treatment and recycling of aluminum ash and convert the aluminum ash into metallurgical auxiliary materials with excellent performance has become a technical challenge facing the iron and steel industry and the aluminum industry together; Therefore, there is a need for a premelted conductive refining agent for steelmaking and a preparation method thereof, which are used for solving the technical problems. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a premelting conductive refining agent for steelmaking and a preparation method thereof, which are used for solving the problems in the prior art. In order to achieve the above purpose, the invention provides a premelted conductive refining agent for steelmaking and a preparation method thereof. In a first aspect, the invention provides a premelted conductive refining agent for steelmaking, which adopts the following scheme: The premelting conductive refining agent for steelmaking comprises an electrorefining agent, wherein the refining agent is prepared by smelting a raw material system containing hazardous waste aluminum ash, the mass content of metal aluminum in the aluminum ash is less than or equal to 15 percent, and the content is combined with a smelting temperature range of 1300-1500 ℃ to avoid excessive oxidation of the metal aluminum and ensure that the decomposition efficiency of aluminum nitride is more than or equal to 99 percent; The raw materials for preparing the refining agent comprise, by weight, 40-70 parts of aluminum ash, 25-55 parts of calcareous materials and 1-10 parts of magnesia materials; The raw materials are smelted to form a refining agent, and the chemical components of the refining agent are 2-20% of Al 2O3:35%-58%,CaO:30%-50%,MgO:1%-8%,SiO2; The content of fluorine ions in the refining agent is less than or equal to 0.5 percent, and the content of nitrogen elements is less than or equal to 0.1 percent; and the mass percentage ratio of (CaO content + MgO content) to SiO2 content is 2.0-5.0. Preferably, the calcareous material is a mixture of carbide slag and papermaking white mud, and the mass ratio of the calcareous material to the papermaking white mud is 1 (0.8-1.2). Preferably, the magnesia material is a composite material of light burned magnesium powder and dolomite, wherein the mass ratio of the light burned magnesium powder is more than or equal to 60 percent. In a second aspect, the invention provides a preparation method of a premelted conductive refining agent for steelmaking, which adopts the following scheme: The preparation method of the premelted conductive refining agent for steelmaking is applied to the premelted conductive refining agent for steelmaking and comprises the following steps: S1, raw material pretreatment, namely sieving aluminum ash, spraying and passivating by brine, and respectively drying and crushing calcareous materials and magnesian materials; s2, batching and mixing, namely accurately weighing and uniformly mixing 40-70 parts of aluminum ash, 25-55 parts of calcareous materials and 1-10 parts of magnesia materials; S3, smelting, namely putting the uniformly mixed materials into a smelting furnace, and smelting at the temperature of 1