Method for preparing furnace lining of metallurgical intermediate frequency furnace

An intermediate frequency furnace and furnace lining technology, which is applied in the field of metallurgical furnace lining refractory materials, can solve the problems of aluminum-carbon sliding, waste of resources, environmental pollution, etc., and achieve the effects of energy saving, good sintering performance, and dense particle accumulation.

Inactive Publication Date: 2013-08-21
德清县力拓炉料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method not only wastes resources, but also seriously pollutes the environment due to the difficulty of natural digestion of aluminum carbon slides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The waste skateboard powder raw material is ball milled and ferromanganese is recovered by using a permanent magnet roller type strong magnetic separator combined with a pulsating high gradient magnetic separator. In the biofilter with stirring device, add 1 t of waste skateboard powder that has been treated with strong magnetic field and 10 m 3 Silica Bacillus and Concentrated Aspergillus Solution. It was carried out for 7 days and nights under non-sterile conditions at 25°C, the solid-liquid ratio was 1:3, the leaching time was 7 days and nights, and corresponding biological agents were added. Chemical composition of final waste skateboard powder Al 2 o 3 increased to 90.2%, SiO 2 The content is reduced to 5.60%, and the aluminum-silicon ratio reaches 16.1. The results of chemical analysis before and after leaching showed that Fe 2 o 3 The highest reduction rate was 3.7%, and the lowest was 0.9%.

[0036] 10kw grinding machine, working time 5 hours, particle cr...

Embodiment 2

[0040] Waste skateboard powder treatment is the same as in Example 1, 10 kilowatts grinder, working time 12 hours, particle critical particle size and particle gradation (w) are: high alumina bauxite clinker 8 ~ 5mm, 5 ~ 3mm, 3 ~ 1mm , 1 ~ 0mm, the total of the four particle sizes is 20%, and the weight ratio is 8:17:20:5; the recycled waste skateboard secondary particles (8 ~ 5mm, 5 ~ 3mm, 3 ~ 1mm three particle sizes total 26% %, the weight ratio is 5:30:25; 1-0.1 mm white corundum, tabular corundum and fused magnesia are 15%, 15% and 7% respectively, ≤0.1 mm corundum fine powder is 6%, ≤0.1 mm fused magnesia is 3%, SiC powder ≤0.005 mm is 7%. The final raw material ratio is: scrap slide 26%, high alumina bauxite 20%, corundum 36%, magnesia 10%, SiC powder 7% , Quartz 1% (additional), boric acid 0.5% (additional).

[0041]After the dry-type ramming material of this product is sintered in the intermediate frequency furnace, the furnace lining forms a sintered layer, a semi-s...

Embodiment 3

[0044] Waste skateboard powder treatment is the same as in Example 1, 10 kilowatts grinder, working time 6 hours, particle critical particle size and particle gradation (w) are: high alumina bauxite clinker 8 ~ 5mm, 5 ~ 3mm, 3 ~ 1mm , 1 ~ 0mm, the total of the four particle sizes is 12%, and the weight ratio is 13:24:10:3; the recycled waste skateboard secondary particles (8 ~ 5mm, 5 ~ 3mm, 3 ~ 1mm three particle sizes total 38% %, the weight ratio is 12:25:13; white corundum, tabular corundum and fused magnesia of 1 to 0.1 mm are 10%, 13% and 4% respectively, corundum fine powder of ≤0.1 mm is 14%, and ≤0.1 mm fused magnesia is 5%, ≤0.005 mm SiC powder 2%, silicon powder 2%. The final raw material ratio is: scrap slide 38%, high alumina bauxite 12%, corundum 37%, magnesia 9% , SiC powder 2%, silicon powder 2%, quartz 0.8% (additional), boric acid 0.7% (additional).

[0045] After the dry-type ramming material of this product is sintered in the intermediate frequency furnace,...

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Abstract

The invention relates to a method for preparing a furnace lining of a metallurgical intermediate frequency furnace. According to the method, the furnace lining is prepared through sintering a dry-ramming material, wherein the dry-ramming material is prepared from the following ingredients in percentage by mass: 26-50% of abandoned skateboard particles, 5-20% of high-bauxite chamotte, 18-50% of corundum particles, 5-17% of magnesite particles, 1-7% of high-temperature burning promoting agent, 0.5-1% of quartz and 0.5-1% of boric acid; and the particle diameters of the abandoned skateboard particles and the high-bauxite chamotte are not greater than 10 mm, and the particle diameters of the corundum particles and the magnesite particles are not greater than 1 mm. Due to the adoption of the technical scheme, compared with the same industry that a large amount of plate-shaped corundum and extra-grade bauxite is used directly, the method has the advantages that used abandoned skateboard resources serve as an important raw material of ingredients, so that the energy consumption is reduced greatly, useful resources are recovered, the number of abandoned skateboards discharged into the environment is reduced greatly, the economic benefit is considerable and the environmental benefit is remarkable.

Description

Technical field [0001] The invention involves a kind of refractory material for metallurgical furnaces, especially the preparation method of a metallurgical furnace lining. Background technique [0002] With the expansion of the scale of my country's steel enterprises, the continuous update of steelmaking technology, and the continuous increase in steel types, a series of new metallurgical technologies and new processes have been widely promoted and applied, especially the mid -frequency furnace technology.High -efficiency, rapid melting, and large -scaleization have become a new trend of the current development of the medium -frequency induction furnace. As a result, higher requirements have been put on the cost and performance of supporting furnace lining materials. [0003] my country's steel output has currently reached about 500 million tons per year, of which a large amount of skateboarding is used on the steel bag and linked middle bag during the production process.After t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 陆建荣
Owner 德清县力拓炉料有限公司
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