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Castable for tapping channel of steelmaking electric furnace and preparation method thereof

A technology of tapping channels and castables, applied in furnaces, electric charge control, furnace components, etc., can solve problems such as brick seam erosion and low service life, and achieve the effects of increasing cutting hardness, compact structure, and promoting sintering

Pending Publication Date: 2020-09-04
ZHENGZHOU ANNEC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a castable for steel-making electric furnace tapping trough and its preparation method, which has the advantages of resistance to molten steel erosion, corrosion resistance, and excellent thermal shock stability, and solves the problem of traditional clay commonly used Bricks and ordinary high-alumina bricks are built with low service life and serious corrosion of brick joints by molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: A castable for steelmaking electric furnace tapping trough, including the following raw materials in parts by weight, 60-72 parts of super-grade bauxite clinker particles, 5-20 parts of andalusite powder, 5-20 parts of silicon carbide powder 10 parts, 3-10 parts of α-alumina powder, 5-10 parts of graphite powder, 4-8 parts of silica powder, 4-10 parts of aluminate cement, antioxidant (metal silicon powder and metal aluminum powder) 2-10 parts 0.1-0.5 parts of dispersant, wherein the aluminum content in super-bauxite clinker is greater than 85.0%, the aluminum content in andalusite powder is greater than or equal to 55%, the aluminum content in CA-70 cement is greater than 70%, and the aluminum content in microsilica powder The content of silicon is greater than 95%, the purity of silicon carbide is greater than 95%, and the purity of metal aluminum powder and metal silicon powder is greater than 90%.

[0021] A method for preparing castables for tapping sp...

Embodiment 2

[0026] Embodiment 2: A kind of pouring material for the lower hole of the hot blast furnace is prepared according to the following steps:

[0027] 1) 25 parts by weight of special-grade bauxite clinker with a particle size of 8-5 mm and 25 parts of special-grade bauxite clinker with a particle size of 5-0 mm are put into a stirring device and stirred for 1-2 minutes.

[0028] 2) The parts by weight are 20 parts of 200 mesh andalusite powder, 6 parts of 725 mesh alumina powder, 4 parts of 5 micron silicon micropowder, 5 parts of silicon carbide powder, 4 parts of graphite powder, 6 parts of CA-70 cement, metal silicon 3 parts of powder, 2 parts of metal aluminum powder, 0.15 part of sodium tripolyphosphate, 0.05 part of sodium hexametaphosphate, the weighing ratio is good, and mixed in a pre-mixer for 1-2 minutes to obtain a fine powder matrix.

[0029] 3) Add the pre-mixed fine powder matrix in step 2) to the mixing equipment in step 1) and stir for 3-5 minutes, mix evenly to ...

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Abstract

The invention relates to the technical field of tapping channel castables of steelmaking electric furnaces. The invention further discloses a castable for a tapping channel of a steelmaking electric furnace and a preparation method of the castable. The castable is prepared from the following raw materials in parts by weight: 60 to 72 parts of special-grade alumina clinker particles, 5 to 20 partsof andalusite powder, 5 to 10 parts of silicon carbide powder, 3 to 10 parts of alpha-alumina powder, 5 to 10 parts of graphite micro powder, 4 to 8 parts of silica powder, 4 to 10 parts of aluminatecement, 2 to 10 parts of an antioxidant and 0.1 to 0.5 part of a dispersing agent. The invention discloses the castable for the tapping channel of the steelmaking electric furnace and the preparationmethod thereof. The special-grade high-alumina bauxite clinker as a main raw material has the characteristics of compact structure, good high-temperature volume stability and high refractoriness, great convenience is provided for manufacturing the castable of the tapping channel, the content of silicon in silicon carbide is set to be greater than 90% by adding a proper amount of silicon carbide and carbonaceous materials, and the cutting hardness is further increased due to good thermal conductivity and strong cutting capacity of the silicon carbide.

Description

technical field [0001] The invention relates to the technical field of a casting material for a tapping channel of an electric steelmaking furnace, and a method for manufacturing and using the casting material for the tapping channel, in particular to a casting material for a tapping channel of an electric steelmaking furnace and a preparation method thereof. Background technique [0002] The tapping spout is an important part of the steelmaking equipment system. The tapping spout is subjected to the intermittent erosion of high-temperature molten steel during use. In order to prolong the service life of the tapping spout, the refractory material for the tapping spout is required to have good Thermal shock resistance, molten steel erosion resistance and slag corrosion resistance, steel-making electric furnaces and steel-making open hearth furnaces in my country were usually built with clay bricks and ordinary high-alumina bricks in the past, and the service life was low. The j...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66F27D3/14
CPCC04B35/66F27D3/145C04B2235/3217C04B2235/3463C04B2235/3826C04B2235/425C04B2235/3418C04B2235/428C04B2235/402
Inventor 李富朝尹坤宝崔亚蕾邓俊
Owner ZHENGZHOU ANNEC IND
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