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Compound magnesium-aluminum-chrome refractory castable for copper smelting tundish

A technology for compounding magnesium-aluminum-chromium and refractory castables, applied in the field of refractory materials, can solve the problems of sticking slag, short service life, deformation, etc., and achieve the effect of preventing cracking and falling off, and enhancing thermal shock resistance.

Active Publication Date: 2014-07-09
郑州瑞泰耐火科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The original refractory material used in the lining of the tundish is usually aluminum-silicon ramming material. The existing problems are poor corrosion resistance to copper liquid, sticky slag, and short service life.
However, the sintering temperature of this process is high, the sintering range is narrow, and deformation, cracking, and under-burning are prone to occur during sintering, and the prepared materials are not suitable for in-situ pouring monolithic refractories.

Method used

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  • Compound magnesium-aluminum-chrome refractory castable for copper smelting tundish
  • Compound magnesium-aluminum-chrome refractory castable for copper smelting tundish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 5-1mm magnesia 48%, 5-1mm chrome ore 8%, 1-0mm chrome concentrate 10%, d903 , The compressive strength is 68MPa at 110°C and 90MPa at 1100°C; the flexural strength is 8.6MPa at 110°C and 13MPa at 1100°C; the firing line change is -0.1%.

Embodiment 2

[0030] Use 50% of 5-1mm magnesia, 10% of 5-1mm chrome ore, 10% of 1-0mm chrome concentrate, d903 , The compressive strength is 60MPa at 110°C and 70MPa at 1100°C; the flexural strength is 8MPa at 110°C and 12MPa at 1100°C; the firing line change is -0.1%. Example 3

Embodiment 3

[0031]5-1mm magnesia 45%, 5-1mm chrome ore 9%, 1-0mm chrome concentrate 10%, d903 , The compressive strength is 70MPa at 110°C, and 98MPa at 1100°C; the flexural strength is 10MPa at 110°C, and 18MPa at 1100°C; the firing line change is -0.1%.

[0032] We found that containing MgO, Cr 2 o 3 、Al 2 o 3 Ternary refractories have excellent resistance to copper slag erosion, thermal shock resistance, spalling resistance, good high temperature volume stability, and mechanical shock resistance. Contains MgO, Cr 2 o 3 、Al 2 o 3 Unshaped refractory materials such as non-metal oxides, usually the combination of components must be sintered above 1600 ° C to achieve ceramic bonding to form MgO.Cr 2 o 3 Spinel, MgO.Al 2 o 3 Good crystal phases such as spinel, so as to achieve the required superior performance. The temperature of copper smelting is relatively low, the melting point of copper is 1083°C, and the temperature of molten copper flowing into the tundish from the reverbe...

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Abstract

The invention relates to a compound magnesium-aluminum-chrome refractory castable for a copper smelting tundish. The refractory castable comprises the following components: 5-1mm magnesium sand, 5-1mm chrome ore, 1-0.01mm chrome concentrate, magnesium-aluminium spinel with d90 being less than 0.088mm, alpha-alumina micro powder with d95 being less than 0.020mm, magnesium sand fine powder with d90 being less than 0.088mm, silica powder, aluminate cement, water reducing agent and boric acid. The magnesium-aluminum-chrome refractory castable disclosed by the invention can be sintered and shows excellent thermal shock resistance, stripping resistance, erosion resistance, slag bonding prevention and the like under a low temperature process condition in copper smelting, thereby meeting the use requirement of long-term use of a fireproof lining of a copper smelting tundish.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. More specifically, the invention relates to a composite magnesium-aluminum-chromium refractory castable for copper smelting tundish. Background technique [0002] The emergence of refractory castables is a mileage cup in the history of refractory materials. Refractory castables not only have excellent performance, but also have simple production processes and low cost, especially in high-temperature equipment such as ladles, converters, and electric furnaces. Improve the service life of the equipment. [0003] The copper smelting tundish is an indispensable key equipment in the process of copper smelting. The copper liquid flowing from the reverberatory furnace flows into the tundish, and after staying in the tundish for 10-15 minutes, the cast copper billet is released. The original refractory material used for the inner lining of the tundish is usually aluminum-silicon ramming mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K21/02C04B35/66C04B35/622
Inventor 李全有郑建立赵洪亮曹伟赵路生陈文龙
Owner 郑州瑞泰耐火科技有限公司