Composite molten steel slag washing agent based on LF (ladle furnace) refining waste slag and preparation method thereof

A technology for refining waste slag and composite slag, which is applied in the field of auxiliary materials, can solve the problems of unspecified ladle furnace refining waste slag, unscientific and reasonable composition and preparation method, etc., and achieves the effect of high sulfur capacity

Inactive Publication Date: 2010-09-29
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to not clarifying the refining slag under the conditions of the ladle furnace refining waste slag, the patent is also unscientific and reasonable in terms of composition and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The percentages by weight of the LF furnace refining waste residue, active lime and industrial soda in this embodiment are: LF furnace refining waste residue: 74%, active lime: 17%, and industrial soda: 9%.

[0021] LF furnace refining waste slag includes the following components by weight percentage: CaO: 57%, Al 2 o 3 : 31%, SiO 2 : 6%, MgO: 5%, MnO+FeO: 0.8%, P 2 o 5 : 0.02%, S: 0.18%.

[0022] Active lime consists of the following components by weight percentage: CaO: 93%, SiO 2 : 5%, MgO: 2%.

[0023] The particle size of LF furnace refining waste residue is 0.5mm; the particle size of active lime is 0.5mm, and the activity degree of active lime is 350ml / 4N-HCl; the particle size of industrial soda is 0.5mm.

[0024] The preparation method of the molten steel composite slag lotion based on the LF furnace refining waste slag of this embodiment first crushes the LF furnace refining waste slag to a particle size of 0.5 mm, crushes the active lime to a particle siz...

Embodiment 2

[0027] The percentages by weight of the LF furnace refining waste residue, active lime and industrial soda in this embodiment are: LF furnace refining waste residue: 65%, active lime: 30%, and industrial soda: 5%.

[0028] LF furnace refining waste slag includes the following components by weight percentage: CaO: 50%, Al 2 o 3 : 35%, SiO 2 : 8%, MgO: 6%, MnO+FeO: 0.7%, P 2 o 5 : 0.01%, S: 0.29%.

[0029] Active lime consists of the following components by weight percentage: CaO: 94%, SiO 2 : 3%, MgO 3%.

[0030] LF furnace refining waste slag particle size 2.0mm; activated lime particle size 2.0mm, active lime activity 360ml / 4N-HCl; industrial soda particle size 0.8mm.

[0031] The preparation method of the molten steel composite slag lotion based on the LF furnace refining waste slag of this embodiment first crushes the LF furnace refining waste slag into a particle size of 2.0 mm, crushes the active lime into a particle size of 2.0 mm, and crushes the industrial soda i...

Embodiment 3

[0034] The percentages by weight of the LF furnace refining waste residue, active lime and industrial soda in this embodiment are: LF furnace refining waste residue: 85%, active lime: 10%, and industrial soda: 5%.

[0035] LF furnace refining waste slag includes the following components by weight percentage: CaO: 60%, Al 2 o 3 : 25%, SiO 2 : 7%, MgO: 7%, MnO+FeO: 0.74%, P 2 o 5 : 0.01%, S: 0.25%.

[0036] Active lime consists of the following components by weight percentage: CaO: 90%, SiO 2 : 6%, MgO: 4%.

[0037] LF furnace refining waste slag particle size 3.0mm; activated lime particle size 3.0mm, active lime activity 380ml / 4N-HCl; industrial soda particle size 1.0mm.

[0038] The preparation method of the molten steel composite slag lotion based on the LF furnace refining waste slag of this embodiment first crushes the LF furnace refining waste slag to a particle size of 3.0 mm, crushes the active lime to a particle size of 3.0 mm, and crushes the industrial soda to ...

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Abstract

The invention discloses a composite molten steel slag washing agent based on LF (ladle furnace) refining waste slag and a preparation method thereof. The composite molten steel slag washing agent consists of 65 to 95% of LF refining slag, 10 to 30% of active lime and 5 to 15% of industrial soda. The LF refining slag is composed of 50 to 60% of CaO, 25 to 35% of Al2O3, 4 to 8% of SiO2, 4 to 7% of MgO, 0.5 to 1.0% of MnO and FeO, 0.005 to 0.02% of P2O5, and 0.01 to 0.3% of S; the active lime includes 90 to 94% of CaO, and HCl with activity of 350 to 380 ml/4N and granularity of 0.5 to 3.0 mm; and the industrial soda includes 99.2% of Na2CO3 with granularity of 0.5 to 1.0 mm. The preparation method comprises the following steps of: processing the LF refining slag and the active lime into the powder with the granularity of 0.5 to 3.00 mm; uniformly mixing and stirring the materials according to the percentage, dry-pressing and moulding the materials with granularity of 25 to 35 mm and applying the waterproof packaging to the materials. On the condition that the adding quantity is 4 to 6 kg/t, the desulfurization rate of the invention achieves more than 30%, the reduction rate of the total oxygen content is more than 25% and the qualified rate of the thermal top forge is improved from 80% to 95%, so that the invention realizes the resource recycling of the LF refining waste slag and is beneficial to the energy-saving and emission reduction of the iron and steel enterprises.

Description

technical field [0001] The invention belongs to the auxiliary materials used in the steelmaking process of the metallurgical industry, and relates to a molten steel composite slag lotion that is added to the ladle during the tapping process of the converter and used as an adsorption deoxidation inclusion, specifically a LF furnace based A molten steel composite slag lotion for refining waste slag and a preparation method thereof. Background technique [0002] The secondary refining technology of molten steel mainly includes slag blocking and tapping, synthetic slag washing, slag modification, white slag refining and wire feeding, shape control of inclusions in steel, precise control of molten steel temperature and composition, and vacuum decarburization, degassing, and inclusion The core technologies such as flotation and separation of substances, among which synthetic slag washing is the most widely used technology in the secondary refining process of molten steel. The main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 金爱军文光华胡道峰唐萍王朝东张悦翟卫江王一海
Owner NANJING IRON & STEEL CO LTD
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