Method for producing slag forming agent contg. high calcium and low silicone by corundum arc furnace

An electric arc furnace and slag-forming agent technology, applied in the field of smelting, can solve the problems of high content of harmful impurities, affecting the production of high-quality steel, unstable performance indicators, etc., and achieve the effects of thorough chemical reaction, stable performance indicators, and strong activity.

Inactive Publication Date: 2006-09-13
GUIZHOU DAZHONG NO 7 GRINDING WHEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The high-calcium and low-silicon slagging agent used in the iron and steel metallurgy industry is traditionally produced by calcining in a rotary kiln, and the raw materials are raw bauxite and limestone. The main problem is: due to the rotation of the kiln body, the high temperature movement of the material in the kiln , coupled with the continuous input of raw materials, the temperature difference in the kiln is large (up to about 500 ° C), which makes the product chemical stability poor and performance indicators unstable; CaO, Al 2 o 3 Melting begins at 1200°C. When the furnace temperature exceeds 1400°C, the kiln is prone to clogging, and often the kiln has to be shut down for cleaning after one week of production; the effect of S and P removal is poor (S and P removal to a certain extent cannot be improved, which directly affects high-quality steel. Production), the main chemical component of the product is CaO content≤30%, the activity is poor, and the content of harmful impurities is high, so the product performance is not good

Method used

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  • Method for producing slag forming agent contg. high calcium and low silicone by corundum arc furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Referring to accompanying drawing, a kind of method for producing high calcium and low silicon slagging agent with corundum electric arc furnace comprises the following steps:

[0015] (1) Batching: crush the raw materials to 2-15mm, then mix the ingredients according to the following proportions, 4200kg of slaked bauxite, 5300kg of quicklime, 4kg of calcite, and 1kg of coke;

[0016] (2) Melting: The raw material is put into the electric arc furnace with 3000KVA corundum in batches, 1000kg is put into the furnace before the furnace is started, and the remaining material is put into the furnace in 3 times on average. After the current and voltage are stable for 20-30min, put in 3000kg each time, and put into the furnace after feeding. The material layer is completely melted, and the surface of the material turns red and forms a soft cover to stop the furnace;

[0017] (3) Invert the furnace, receive the package, and cool down;

[0018] (4) Classification: Unqualified c...

Embodiment 2

[0021] Referring to accompanying drawing, a kind of method for producing high calcium and low silicon slagging agent with corundum electric arc furnace comprises the following steps:

[0022] (1) Ingredients: crush the raw materials to 2-15mm, then mix the ingredients according to the following proportions, 4300kg of slaked bauxite, 5200kg of quicklime, 3kg of calcite, and 2kg of coke;

[0023] (2) Melting: The raw materials are put into 3000KVA corundum in batches and poured into the electric arc furnace. Before the furnace is started, 2000kg is put into the furnace. The material layer is completely melted, and the surface of the material turns red and forms a soft cover to stop the furnace;

[0024] (3) Invert the furnace, receive the package, and cool down;

[0025] (4) Classification: Unqualified crystallization is broken to 0-15mm and then used (return to mix ingredients with raw materials after reaching a certain amount, and the addition is 10-20% of the total amount of...

Embodiment 3

[0028] Referring to accompanying drawing, a kind of method for producing high calcium and low silicon slagging agent with corundum electric arc furnace comprises the following steps:

[0029] (1) Batching: crush the raw materials to 2-15mm, then mix the ingredients according to the following proportions, 4500kg of slaked bauxite, 5000kg of quicklime, 3kg of calcite, and 2kg of coke;

[0030] (2) Melting: The raw materials are put into 3000KVA corundum in batches and poured into the electric arc furnace. Before starting the furnace, 3000kg is put into the furnace. The remaining material is put into 3 times on average. After the current and voltage are stable for 20-30min, put in 2333kg each time, and put into the furnace after feeding. The material layer is completely melted, and the surface of the material turns red and forms a soft cover to stop the furnace;

[0031] (3) Invert the furnace, receive the package, and cool down;

[0032] (4) Classification: Unqualified crystall...

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Abstract

The invention discloses a method to make high calcium low silicon fluxing medium by corundum arc furnace that includes the following steps: mixture that crushing raw material and mixing 42-45% wrought aluminium bauxite, 48%-53% calcium oxide, 3-4% calcite and 1-2% coke; melting that adding the raw material into furnace adding 10-30% of the total quantity before blowing on, and the rest would be added for 3-4 times after current and voltage stabilizing for 20-30min, after the material totally melted, and soft cover is formed, the furnace could be shut down; turning down, fetching, and cooling; classifying; taking crashing, testing, packaging, storing to the qualified product. The invention has good chemical stability, high CaO content, strong activity, good performance.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a method for producing a high-calcium-low-silicon slagging agent. Background technique [0002] The high-calcium and low-silicon slagging agent used in the iron and steel metallurgy industry is traditionally produced by calcining in a rotary kiln, and the raw materials are raw bauxite and limestone. The main problem is: due to the rotation of the kiln body, the high-temperature movement of the material in the kiln , coupled with the continuous input of raw material, the temperature difference in the kiln is large (up to about 500 ° C), which makes the product chemical stability poor and the performance index unstable; CaO, Al 2 o 3 Melting begins at 1200°C. When the furnace temperature exceeds 1400°C, the kiln is prone to clogging, and often the kiln has to be shut down for cleaning after one week of production; the effect of S and P removal is poor (S and P removal...

Claims

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Application Information

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IPC IPC(8): C21C7/00
Inventor 牟方勇濮江斌
Owner GUIZHOU DAZHONG NO 7 GRINDING WHEEL
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