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Method for recycling refractory material from stainless steel smelting

A technology of refractory materials and stainless steel, applied in the field of waste utilization, can solve the problems of reusing impermeable layers and eroded layers, and low reusing rate of refractory materials

Active Publication Date: 2012-05-30
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, people use the return method to reuse the used refractories, which can only use the original layer, but not the permeable layer and the erosion layer. Therefore, the return method has a relatively low reuse rate for the used refractories Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0007] Embodiment: smelting 45 tons of stainless steel water.

[0008] 1. Crushing the refractory materials after stainless steel smelting;

[0009] 2. Sieve out particles with a particle size not greater than 5mm, which are called calcium-magnesia brick particles;

[0010] 3. Add 700 kg of calcium-magnesia brick particles to the AOD furnace;

[0011] 4. Add 45 tons of stainless steel water;

[0012] 5. Add 2.65 tons of lime according to general steelmaking requirements, blow oxygen for 30 minutes, blow argon for 40 minutes, add 1-1.5 tons of ferrosilicon / furnace and 0.55 tons of fluorite;

[0013] 6. Carry out alloying reduction smelting, and the smelting time is 60 minutes;

[0014] 7, slag removal (both are prior art, omit its description);

[0015] 8, tapping (both prior art, omit its description).

[0016] The lime is calcium oxide.

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PUM

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Abstract

The invention discloses a method for recycling a refractory material from stainless steel smelting and belongs to waste recycling. The method comprises the steps of smashing, sieving, adding the material into a steel furnace, mixing molten steel, smelting, deslagging and tapping, and is characterized by comprising the following specific steps of: smashing the refractory material from stainless steel smelting; sieving particles with granularity of not more than 5mm, namely calcium-magnesium brick particles; adding calcium-magnesium brick particles into an argon oxygen denitrification refining furnace, and then adding molten steel into the argon oxygen denitrification refining furnace, wherein 15 to 20 kilograms of calcium-magnesium brick particles are mixed with one ton of the molten steel; and adding lime, blowing oxygen, blowing argon, and adding silicon and fluorite to perform alloying reduction smelting according to the conventional steelmaking requirements. By the method, the erosion layer, the permeable layer and the urstoff layer of the refractory material from stainless steel smelting are all recycled and more than 15 kilograms of the material are used for each ton of the molten steel.

Description

Technical field: [0001] The invention belongs to the field of waste utilization, and in particular relates to a method for reusing refractory materials used in stainless steel smelting. Background technique: [0002] After the refractory material used for stainless steel smelting is eroded by molten steel, the refractory material is divided into an erosion layer, a permeable layer, and a primary layer. Every 100 grams of used refractories contains 1.35 grams of ferric oxide, 0.81 grams of aluminum oxide, 3.58 grams of silicon dioxide, 24.105 grams of calcium oxide, 69.91 grams of magnesium oxide, 0.085 grams of manganese oxide, 0.01 grams of nickel oxide, three Chromium oxide 0.15 g. At present, people use the return method to reuse the used refractory material, which can only use the original layer, but not the permeable layer and the erosion layer. Therefore, the return method has a relatively low reuse rate for the used refractory Low. Invention content: [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
CPCY02P10/20
Inventor 赵海泉史永林罗胜刘明生叶文成严文明马达
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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