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A method of producing environment-friendly quick-drying converter gunning material by using waste magnesia-calcium bricks

A magnesia-calcium brick, an environmentally friendly technology, applied in the field of refractory materials, can solve problems such as poor repair effect, waste of resources, long sintering time, etc., to improve high-temperature strength performance, increase room temperature strength, and good adhesion Effect

Active Publication Date: 2021-07-09
甘肃酒钢集团科力耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, magnesia, cement, etc. are mainly used for production, and the sintering time is long and the repair effect is not good.
[0004] The waste magnesia-calcium bricks produced by existing steel mills are all treated as industrial waste, resulting in waste of resources and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for producing converter gunning material by using waste magnesia-calcium bricks. The products produced meet performance requirements such as resistance to molten steel erosion and slag erosion. The specific production process includes the following steps:

[0038] Step (1). The recovered magnesia-calcium bricks are stored waterproof and moisture-proof, and they are stacked separately to ensure that the magnesia-calcium bricks will not be pulverized due to moisture. The recovered magnesia-calcium bricks are manually sorted to remove surface debris and passed through the jaws. Crusher, cone crushing and then sieve screening, iron removal must be added during processing and crushing, and sieve through secondary sieves to obtain aggregates with a particle size of 1-3mm;

[0039] Step (2). The primary processed recycled magnesia-calcium bricks are passed through a wheel mill to eliminate false particles attached to the surface, improve the roundness of the particles,...

Embodiment 2

[0057] A method for producing converter gunning material by using waste magnesia-calcium bricks. The products produced meet performance requirements such as resistance to molten steel erosion and slag erosion. The specific production process includes the following steps:

[0058] Step (1). The recovered magnesia-calcium bricks are stored waterproof and moisture-proof, and they are stacked separately to ensure that the magnesia-calcium bricks will not be pulverized due to moisture. The recovered magnesia-calcium bricks are manually sorted to remove surface debris and passed through the jaws. Crusher, cone crushing and then sieve screening, iron removal must be added during processing and crushing, and sieve through secondary sieves to obtain aggregates with a particle size of 1-3mm;

[0059] Step (2). The primary processed recycled magnesia-calcium bricks are passed through a wheel mill to eliminate false particles attached to the surface, improve the roundness of the particles,...

Embodiment 3

[0078] A method for producing converter gunning material by using waste magnesia-calcium bricks. The products produced meet performance requirements such as resistance to molten steel erosion and slag erosion. The specific production process includes the following steps:

[0079] Step (1). The recovered magnesia-calcium bricks are stored waterproof and moisture-proof, and they are stacked separately to ensure that the magnesia-calcium bricks will not be pulverized due to moisture. The recovered magnesia-calcium bricks are manually sorted to remove surface debris and passed through the jaws. Crusher, cone crushing and then sieve screening, iron removal must be added during processing and crushing, and sieve through secondary sieves to obtain aggregates with a particle size of 1-3mm;

[0080] Step (2). The primary processed recycled magnesia-calcium bricks are passed through a wheel mill to eliminate false particles attached to the surface, improve the roundness of the particles,...

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Abstract

The invention discloses a method for producing an environment-friendly quick-drying converter gunning material by using waste magnesia-calcium bricks. The recycled waste magnesia-calcium bricks are introduced into the gunning material, and regenerated magnesia-calcium sand particles are obtained through secondary processing. A sol binding system mainly composed of magnesium-aluminum sol, silica fume, and ultra-fine powder magnesia, and adding lithium bentonite to promote high-temperature sintering performance, and adding admixtures such as trimer, organic fiber, paper fiber and other additives to produce gunning material construction The performance and use effect are good, the adhesion rate is above 90%, the gunning sintering time is less than 20min, the rebound rate of the gunning material is almost zero during the gunning process, and the material has good adhesion, and can form 100% on the lining matrix of the converter. When the material layer is 200 mm thick, the gunning material layer can chemically react with the steel slag to form a high melting point phase, and the slag freezes on the surface of the material layer, making it difficult to penetrate the material layer. The invention realizes the recycling and efficient utilization of waste, meets the development requirements of national green environmental protection, and has a good promotion prospect.

Description

technical field [0001] The invention belongs to the field of refractory materials, and relates to recycling and reprocessing methods of waste refractory materials, in particular to a method for producing environmentally friendly quick-drying converter gunning by using waste magnesia-calcium bricks and complexed magnesia-aluminum spinel. Background technique [0002] The waste magnesia-calcium bricks used in the present invention are mainly waste magnesia-calcium bricks after recycling stainless steel converters and ladle linings. The main purpose of the magnesia-calcium bricks is to build stainless steel calcium. [0003] The converter gunning material is widely used in the repair of the converter lining for smelting molten steel. It is vulnerable to molten steel washing and slag erosion. Its repair effect and frequency directly affect the service life and production rhythm of the converter. For a long time, magnesia, cement, etc. are mainly used for production, and the sin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/62204C04B35/66C04B2235/3206C04B2235/3208C04B2235/349
Inventor 安建怀张建武凡箭
Owner 甘肃酒钢集团科力耐火材料股份有限公司