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A kind of high-calcium-magnesium-calcium brick and its preparation method

A technology of high-calcium-magnesium-calcium bricks and calcium-magnesium-calcium bricks, which is applied in the field of high-calcium-magnesium-calcium bricks and its preparation, can solve the problems of low free calcium oxide content and poor thermal shock stability of magnesium-calcium bricks, and achieve high bulk density and high temperature. Good stability, not easy to hydrate

Inactive Publication Date: 2011-12-14
PERFECT WORLD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, magnesia-calcium bricks, one of the refractory materials used in domestic stainless steel and special steel smelting, mostly use magnesia-calcium bricks with a calcium content between 20-30%. This kind of magnesia-calcium bricks has low free calcium oxide content and thermal shock stability. Poor performance, so most of these can only be applied to AOD furnaces, not suitable for equipment such as ladles that require high thermal shock stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Example: Production of 100 tons of high-performance high-calcium-magnesium-calcium bricks

[0023] 1. First determine the production formula, that is, the proportion of various raw materials. The formula is: magnesia-calcium sand 7-5mm 10%, 5-3mm 15%, 3-1mm 22%, 1-0.5mm 22%, ≤0.5mm 23%; semi-refined paraffin 3%; made of fused zirconia and electric Additive 5% mixed with molten lime.

[0024] According to the calculation, the amount of each raw material is: magnesia-calcium sand 7-5mm 10 tons, magnesia-calcium sand 5-3mm 15 tons, magnesia-calcium sand 3-1mm 22 tons, magnesia-calcium sand 1-0.5mm 22 tons, magnesia-calcium sand≤0.5 mm 23 tons; 3 tons of semi-refined paraffin binder; 5 tons of additives mixed with fused zirconia and fused lime.

[0025] 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 220k...

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Abstract

The invention discloses a high-calcium magnesium-calcium brick and a preparation method thereof. The main raw materials and components thereof are: 9-16% of 5-7mm magnesia-calcium sand, 9-16% of 3-5mm magnesia-calcium sand, 1-3mm magnesia-calcium sand 9-16%, 0.5-1mm magnesia-calcium sand 13-32%, magnesia-calcium sand ≤0.5mm 5-25%, binder 2-5%, made of fused zirconia and electric Additives 1-5% mixed with molten lime. The preparation method is as follows: according to the above-mentioned raw materials, carry out formula combination, batching, kneading, molding, firing, dipping in wax, and then carry out vacuum aluminum foil packaging. The inventive product not only has high hydration resistance, but also has high slag erosion resistance due to its high purity, and is also superior to other similar products in terms of thermal shock stability. At the same time, because the brick contains more than 40% free CaO, it has excellent performance of cleaning molten steel, and is especially suitable for producing high-cleanness steel such as stainless steel.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a high-calcium-magnesium-calcium brick and a preparation method thereof. Background technique [0002] At present, magnesia-calcium bricks, one of the refractory materials used in domestic stainless steel and special steel smelting, mostly use magnesia-calcium bricks with a calcium content between 20-30%. This kind of magnesia-calcium bricks has low free calcium oxide content and thermal shock stability. Poor performance, so most of these can only be applied to AOD furnaces, not suitable for equipment such as ladles that require high thermal shock stability. Contents of the invention [0003] Aiming at the technical problems in the above-mentioned prior art, the present invention provides a high-calcium-magnesium-calcium brick with high calcium content and strong thermal shock stability and a preparation method thereof. [0004] Technical scheme of the present invention is ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 徐袁琳金锋姚锦海姚建良
Owner PERFECT WORLD CO LTD
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