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Method for producing tundish lower nozzle by using waste material of silicon cutting fluid

A silicon cutting and cutting fluid technology, applied in the field of refractory materials, can solve the problems of cost reduction and high cost of raw materials

Inactive Publication Date: 2012-02-08
淄博高新区联创科技服务中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent No. 200910019792.6 discloses an integral molding process for sizing and quickly replacing the nozzle of the tundish. The service life of the nozzle produced by the integral molding process of the present invention is 8-12 hours, which is longer than that of the nozzle produced by the existing method. More than doubled, but raw material costs are still high
[0005] And part of the use of industrial waste to produce sewers, especially to replace expensive raw materials such as silicon carbide and zirconia, will greatly reduce the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, the metal silicon waste cutting fluid is washed with water. Specifically, 1 ton of waste cutting fluid is dissolved in a sedimentation tank, 5 tons of water are added, stirred, and left to stand, then the upper solution is extracted, and the solution can be dried to extract polyethylene glycol . The lower sediment was rinsed twice with water, then centrifuged and dried to obtain a mixture A containing metallic silicon and silicon carbide, which also contained a small amount of polyethylene glycol and iron.

[0013] Mix the mixture A containing metallic silicon and silicon carbide with corundum powder, high-alumina clay, flake graphite and other raw materials, the weight ratio of which is 30:40:5:25, add water to granulate, use isostatic pressing equipment to form, after forming Put the green body into a continuous tunnel kiln, gradually increase the temperature, and dry it at a maximum temperature of about 350℃, then go through non-destructive testing, packaging, an...

Embodiment 2

[0015] The step of separating polyethylene glycol from the waste metal silicon cutting fluid is the same as in Example 1.

[0016] Mix the mixture A containing metallic silicon and silicon carbide with corundum powder, high alumina clay, flake graphite and other raw materials, the weight ratio of which is 35:40:5:20, add water to granulate, use isostatic pressing equipment to form, after forming Put the green body into a continuous tunnel kiln, gradually increase the temperature, and dry it at a maximum temperature of about 350℃, then go through non-destructive testing, packaging, and then the finished product.

Embodiment 3

[0018] The step of separating polyethylene glycol from the waste metal silicon cutting fluid is the same as in Example 1.

[0019] Mix the mixture A containing metallic silicon and silicon carbide with corundum powder, high alumina clay, flake graphite and other raw materials, the weight ratio of which is 25:43:5:27, add water to granulate, use isostatic pressing equipment to form, after forming Put the green body into a continuous tunnel kiln, gradually increase the temperature, and dry it at a maximum temperature of about 350℃, then go through non-destructive testing, packaging, and then the finished product.

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PUM

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Abstract

The present invention relates to a method for producing a tundish lower nozzle by using a waste material of silicon cutting fluid. The method is characterized by: carrying out a water washing treatment for the waste material of the metal silicon cutting fluid to extract polyethylene glycol to obtain a mixture; mixing the mixture for extracting the polyethylene glycol, corundum powder, high alumina clay, flake graphite and other raw materials, wherein the mixture comprises the metal silicon and silicon carbide, a weight ratio of the mixture to the corundum powder to the high alumina clay to the flake graphite is 10-60:20-40:0-10:10-30; adding water and carrying out granulation; adopting an isostatic pressing device to carry out forming; placing the formed blank body into a continuous tunnel kiln, gradually heating, drying at the highest temperature of about 350 DEG C; carrying out a nondestructive flaw detection and packaging to obtain the tundish lower nozzle finished product. With the tundish lower nozzle, the waste silicon cutting fluid is adopted, the metal silicon metal is adopted as a reducing agent, and is gradually oxidized at the high temperature to generate the silicon dioxide, wherein the silicon dioxide reacts with the corundum to form a mullite phase so as to improve the compactness and the strength of the material; the reaction of the silicon dioxide and the corundum is slowly generated, such that the service life of the lower nozzle produced by the process can be improved by an average more than 2 times.

Description

Technical field [0001] The invention belongs to the field of refractory materials, and specifically relates to a method for manufacturing a tundish nozzle of a metallurgical refractory material. Background technique [0002] With the continuous development of the global iron and steel industry, ordinary billet nozzles can no longer meet the needs of the market. The finished tundish nozzle is a one-time refractory material used for continuous casting of metallurgical enterprises and is the most critical in the continuous casting process. It is installed between the tundish and the mold. It is the channel through which the molten steel is transported from the tundish to the mold. It is necessary to protect the molten steel from secondary oxidation, prevent nitrogen from dissolving or slag mixing into the molten steel and prevent molten steel from splashing. It is also necessary to ensure that the molten steel has a reasonable flow field and temperature field distribution in the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 石汝军郑晓华刘丽洁
Owner 淄博高新区联创科技服务中心