Unfired magnesia-calcium brick and preparation method thereof

The technology of magnesia-calcium brick and magnesia-calcium sand is applied in the field of refractory materials, which can solve the problems of pollution, low service life of fired magnesia-calcium brick, influence on the quality of molten steel, etc. effect of time extension

Active Publication Date: 2010-12-22
浙江金磊耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the ladle refractory materials used for smelting stainless steel and special steel in China are magnesia-carbon bricks, and a small amount of them are fired magnesia-calcium bricks. However, magnesia-carbon bricks have a polluting effect on molten steel and will affect the quality of molten steel. And fired magnesia-calcium bricks have a lower service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Example: Production of 100 tons of unfired magnesia-calcium bricks

[0021] 1. First determine the production formula according to the ratio of various raw materials, the formula is: magnesia calcium sand 7-5mm 10%, 5-3mm 15%, 3-1mm 15%, 1-0.5mm 10%; magnesia 1-0.5mm 12%, ≤0.5mm 23%; graphite 10%; magnesium powder 1.5%; zircon sand 0.5%; anhydrous resin binder 3%.

[0022] According to the calculation, the amount of each raw material is: magnesia calcium sand 7-5mm 10 tons, 5-3mm 15 tons, 3-1mm 15 tons, 1-0.5mm 10 tons; magnesia 1-0.5mm 12 tons, ≤0.5mm 23 tons ; 10 tons of graphite; 1.5 tons of magnesium powder; 0.5 tons of zircon sand; 3 tons of anhydrous resin binder.

[0023] 2. Batching and mixing. According to the above production formula, batching is carried out. The total weight of each batching is 1000kg. The specific batching is: magnesia calcium sand 7-5mm 100kg, 5-3mm 150kg, 3-1mm 150kg, 1-0.5mm100kg; magnesia 1-0.5mm mm 120kg, ≤0.5mm 230kg; graphite 100kg...

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Abstract

The invention discloses an unfired magnesia-calcium brick which is prepared from the following raw materials in percentage by weight: 9-16 percent of 5-7mm magnesia-calcium sand, 9-16 percent of 3-5mm magnesia-calcium sand, 9-16 percent of 1-3mm magnesia-calcium sand, 9-16 percent of 0.5-1mm magnesia-calcium sand, 4-16 percent of 0.5-1 mm magnesia sand, 5-25 percent of not larger than 0.5mm magnesia sand, 1-10 percent of graphite, 2-5 percent of anhydrous resin bonding agent and 1-3 percent of additive formed by mixing magnesia powder and zircon sand. The processing method comprises the following steps of: crushing, grinding, compounding, pressing and forming, heating, baking and carrying out waterproof treatment. In the invention, the unfired magnesia-calcium brick with great volume density and high compression strength can be prepared due to reasonable compounding and a scientific treatment process, and particularly, the additive formed by mixing the magnesia powder and the zircon sand is used, therefore, the product has good medium-temperature strength, waterproofness and crack resistance.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to an unfired magnesia-calcium brick and a preparation method thereof. Background technique [0002] At present, most of the ladle refractory materials used for smelting stainless steel and special steel in China are magnesia-carbon bricks, and a small amount of them are fired magnesia-calcium bricks. However, magnesia-carbon bricks have a polluting effect on molten steel and will affect the quality of molten steel. The service life of fired magnesia-calcium bricks is relatively low. Contents of the invention [0003] The present invention aims at the technical problems existing in the above-mentioned prior art, and provides an unfired magnesia-calcium brick with a long service life, which can also purify molten steel and improve the quality of steelmaking, and a preparation method thereof. [0004] Technical scheme of the present invention is realized like this: [0005] An ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 姚建良金锋徐袁琳姚锦海金红兵王丹鲍继荣
Owner 浙江金磊耐火材料有限公司
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