High-purity Mg-Ca sand and preparation method thereof

A technology of pure magnesia-calcium sand and magnesia-calcium sand, which is applied in the field of high-purity magnesia-calcium sand and its preparation, which can solve the problems of low density of magnesia-calcium sand, low volume density of products, and low ball strength, etc., and improve thermal shock stability High performance, high purity, and the effect of increasing thermal shock performance

Inactive Publication Date: 2013-04-24
PERFECT WORLD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the refractory raw material magnesia-calcium sand used for firing magnesia-calcium bricks in China is generally formed by light-burned magnesia powder, light-burned dolomite dry method or semi-dry method, and the selection of binders and additives is not ideal. The degree of sand density is not high, and the ball strength is not high. During the brick making process, the product volume density is not high, and the thermal shock resistance is not good.
These have become bottlenecks in the process of product use, causing the product to go offline in advance

Method used

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Experimental program
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Embodiment

[0021] Embodiment: produce 100 tons of novel wet synthesis high-purity magnesia-calcium sands

[0022] 1. First determine the production formula, that is, the proportion of various raw materials. The formula is: lightly burned dolomite 30%, lightly burned magnesium powder 47%, brine 20%, fused zirconia 3%. According to the calculation, the consumption of each raw material is: 30 tons of light-burned dolomite; 47 tons of light-burned magnesium powder; 20 tons of brine, and 3 tons of fused zirconia.

[0023] 2. Ingredients and co-milling. According to the above production formula, batching is carried out, the total weight of each batching is 1000kg, and the specific batching is: 300kg of lightly burned dolomite; 200kg of brine; 470kg of lightly burned magnesium powder; 30kg of fused zirconia. Dosing according to the formula combination, and then put it into a ball mill for joint fine grinding, the ball milling time is not less than 3 minutes, and the particle size of the pow...

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PUM

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Abstract

The invention discloses high-purity Mg-Ca sand and a preparation method thereof. The high-purity Mg-Ca sand is prepared mainly from 17 to 62% of lightly calcined dolomite, 20 to 65% of lightly calcined dolomite Mg powder, 15 to 25% of a mixture of a binder and bittern, and 2 to 5% of electric-melting zirconia. The preparation method comprises the following steps of raw material proportioning, raw material blending, ball milling, wet method-based mixing, pressing pelleting, natural drying, sintering and discharging. The high-purity Mg-Ca sand has high green-pressing ball strength, high post-sintering compactness, excellent hydration resistance, high purity and low stable zirconia content and thus a brick prepared from the high-purity Mg-Ca sand has low impurity content and excellent thermal shock resistance. The brick prepared from the high-purity Mg-Ca sand contains a large amount of CaO and thus the brick has excellent molten steel cleaning performances and is especially suitable for production of high-cleanliness steel such as stainless steel.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a high-purity magnesia-calcium sand and a preparation method thereof. Background technique [0002] At present, the refractory raw material magnesia-calcium sand used for firing magnesia-calcium bricks in China is generally formed by light-burned magnesia powder, light-burned dolomite dry method or semi-dry method, and the selection of binders and additives is not ideal. The degree of sand density is not high, and the ball strength is not high. During the brick making process, the product volume density is not high, and the thermal shock resistance is not good. These have become bottlenecks in the process of product use, causing the product to go offline in advance. Contents of the invention [0003] The invention overcomes the disadvantages of the above-mentioned prior art, and provides a high-purity magnesia-calcium sand with high strength, high compactness after firing, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/03C04B35/626
Inventor 姚建良姚锦海徐袁琳沈安林金锋
Owner PERFECT WORLD CO LTD
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