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A kind of molten steel purifying agent in the form of composite sphere and its production method

A purifying agent and sphere technology, which is applied in the field of molten steel purifying agent, purification and refining of liquid non-ferrous metals, and can solve problems such as affecting the efficiency of composite spheres.

Active Publication Date: 2016-08-24
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent CN101319267A is a typical example of generating tiny air bubbles inside the molten steel to remove inclusions, but the specific gravity of the composite sphere produced is relatively light, which affects the efficiency of the composite sphere entering the molten steel to exert its effect

Method used

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  • A kind of molten steel purifying agent in the form of composite sphere and its production method
  • A kind of molten steel purifying agent in the form of composite sphere and its production method
  • A kind of molten steel purifying agent in the form of composite sphere and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Use 200kg of aluminum powder (Al: 99.5%, particle size less than 3mm), 200kg of ferrosilicon (Si: 75%, Al 2.0%, Ca1.5%, C: 0.1%, S: less than 0.02%, P: less than 0.04%, Fe balance, particle size less than 3mm), high carbon ferromanganese 470kg (Mn: 65%, C: 6.0%, Si: 2.5%, S: less than 0.03%, P: less than 0.38%, Fe balance, particle size less than 3mm) , Alkaline sodium silicate solution (modulus 3.4, Baume degree 40) 35kg puts into the mixer together and stirs for 20 minutes, after the evenly stirred material goes through the belt conveyor to the hoist, it is evenly added into the ball press machine to be pressed into balls, passed The size of the spheres is controlled and determined by sieving to obtain a spherical nucleus with a diameter of 10±0.5mm. Limestone powder (CaCO 3 : greater than 98%, particle size less than 1mm) 600kg and calcium oxide powder (CaO: greater than 90%, particle size less than 1mm) 600kg as jersey materials, the activity of calcium oxide is mo...

Embodiment 2

[0046] Use 200kg of aluminum powder, 200kg of ferrosilicon, 470kg of high-carbon ferromanganese (requirements such as above-mentioned material composition and particle size are the same as embodiment 1, the same below) and drop into mixer together and stir for 20 minutes, after the material after stirring is through belt conveyor, equably A disc pelletizing machine is added, and the rotating speed of the pelletizing machine is 400-1200r / min. Spray into alkaline sodium silicate solution, the solution quality is 3% of alloy powder quality. After pelletizing, the size of the pellets is controlled and determined by sieving, and the pellets are used as pellet cores with a diameter of 10±0.5mm. Take 600kg of limestone powder and 600kg of calcium oxide powder as jersey materials, and fully mix them in a mixer for 1 to 2 hours. In the disc pelletizer, add jersey material, spray limestone powder and a binder with a mass fraction of calcium oxide of 3%, roll and pelletize to form a com...

Embodiment 3

[0048] Use 2kg of aluminum powder, 2kg of ferrosilicon, 4.70kg of low-carbon ferromanganese, and 0.3kg of alkaline sodium silicate solution to press to prepare spherical cores. The method is the same as in Example 1. The powder required for the jersey is 6kg of light calcium carbonate, 6kg of calcium oxide and 0.6kg of calcium aluminate cement binder, which are fully mixed in the mixer, and the pellets are sent to the disc pelletizer, and the jersey powder is added , spray an appropriate amount of water not exceeding 2% of the mass of the powder, the speed of the disc pelletizer is 400-1200r / min, and roll to form composite spheres. Composite spheres with a size of 15±0.5mm and a residual moisture of no more than 0.5% were obtained by sieving. Dry the composite sphere at 110-120°C for 4 hours. The compressive strength of the composite sphere is greater than 2000N, and the drum index is greater than 90%. Cool to room temperature, test the composition and strength, and use it wit...

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Abstract

The invention relates to a composite sphere-form molten steel purifying agent and a production method thereof and belongs to the technical field of steelmaking. The molten steel purifying agent is a composite sphere in form, the composite sphere is composed of a pellet core and a shell, the pellet core is made of a metal material, the shell is made of carbonate, the pellet core is mainly composed of a mixture of alloy powder of silicon, manganese and aluminium, and the shell is mainly composed of one or mixture of not more than three of calcium carbonate, magnesium carbonate, sodium carbonate, calcium oxide and magnesium oxide. The molten steel purifying agent has the advantages that a formula is scientific, a technology is simple, inclusions in molten steel can be effectively removed, total oxygen content in steel is reduced, steel product quality is improved, and smelting cost is reduced; and the molten steel purifying agent also can be used for purifying and refining molten nonferrous metal in a liquid state.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a clarifier for molten steel in the form of a composite sphere and a production method, which is suitable for purification and refining of molten steel, a composite sphere for refining outside a furnace to remove fine inclusions, and a method for making the same. It can be used for purification and refining of liquid non-ferrous metals. Background technique [0002] In order to meet the higher and higher requirements for steel quality in all walks of life, both at home and abroad are looking for ways to clean steel and molten steel purifiers to further improve the cleanliness of molten steel. The key to producing clean steel is to control inclusions. To control the quality of inclusions, the most important thing is to control the quantity and size of inclusions. Due to different steel types and smelting cost constraints, the requirements for inclusions are also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04
Inventor 倪冰杨勇刘浏贺庆姚同路孟华栋赵军普王乐
Owner CENT IRON & STEEL RES INST
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