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High-purity and high-density calcium magnesia and preparation process thereof

A high-density, high-purity technology, applied in the field of refractory material preparation, can solve the problems of complex process, high process cost, and lower sintering temperature of magnesia-calcium sand, and achieve the effect of simple process steps, reduced production cost and low price

Inactive Publication Date: 2021-12-10
SHANXI LUWEIBAO TAIGANG REFRACTORIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can reduce the sintering temperature of magnesia-calcium sand, and the semi-finished ball can be sintered and dense at a temperature lower than 1800°C, but the process is costly and complicated
[0004] Generally speaking, there is no production method of magnesia-calcium sand, which not only has the characteristics of low cost and simple process, but also has high purity, high density, anti-alkaline slag erosion and hydration resistance. Excellent performance, long service life and other advantages

Method used

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  • High-purity and high-density calcium magnesia and preparation process thereof
  • High-purity and high-density calcium magnesia and preparation process thereof
  • High-purity and high-density calcium magnesia and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Crushing and sieving the mined natural dolomite to obtain 35-60mm dolomite, and roasting at 1100°C to obtain lightly burned dolomite.

[0073] (2) Analyze the test data of light-burned dolomite and light-burned magnesium, fully consider possible influencing factors in the production process, and calculate the proportion of ingredients (31-52): (69-48);

[0074] (3) Light-burned dolomite and light-burned magnesium are sent to the European mill for grinding by the belt conveyor respectively, and the passing rate of 325 mesh is not less than 90%;

[0075] (4) Dosing according to a certain ratio through a quantitative feeder;

[0076] (5) After mixing evenly, send the ball into a high-pressure ball pressing machine to obtain a semi-finished product ball;

[0077] Press the ball on a 380T high-pressure ball pressing machine and press it into a 30×30×17mm ball (the size of the ball socket of the ball pressing machine is 30×30×17mm, and the ball forming capacity is 10t / h)...

Embodiment 2

[0083] (1) Crushing and sieving the mined natural dolomite to obtain 35-60mm dolomite, and roasting at 1100°C to obtain lightly burned dolomite.

[0084] (2) Analyze the test data of light-burned dolomite and light-burned magnesium, fully consider possible influencing factors in the production process, and calculate the proportion of ingredients (31-52): (69-48);

[0085] (3) Light-burned dolomite and light-burned magnesium are sent to the European mill for grinding by the belt conveyor respectively, and the passing rate of 325 mesh is not less than 90%;

[0086] (4) Dosing according to a certain ratio through a quantitative feeder;

[0087] (5) After mixing evenly, send the ball into a high-pressure ball pressing machine to obtain a semi-finished product ball;

[0088] Press the ball on a 380T high-pressure ball pressing machine and press it into a 30×30×17mm ball (the size of the ball socket of the ball pressing machine is 30×30×17mm, and the ball forming capacity is 10t / h)...

Embodiment 3

[0095] (1) Crushing and sieving the mined natural dolomite to obtain 35-60mm dolomite, and roasting at 1100°C to obtain lightly burned dolomite.

[0096] (2) Analyze the test data of light-burned dolomite and light-burned magnesium, fully consider possible influencing factors in the production process, and calculate the proportion of ingredients (31-52): (69-48);

[0097] (3) Light-burned dolomite and light-burned magnesium are sent to the European mill for grinding by the belt conveyor respectively, and the passing rate of 325 mesh is not less than 90%;

[0098] (4) Dosing according to a certain ratio through a quantitative feeder;

[0099] (5) After mixing evenly, send the ball into a high-pressure ball pressing machine to obtain a semi-finished product ball;

[0100] Press the ball on a 380T high-pressure ball pressing machine and press it into a 30×30×17mm ball (the size of the ball socket of the ball pressing machine is 30×30×17mm, and the ball forming capacity is 10t / h)...

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Abstract

The invention provides high-purity and high-density calcium magnesite and a preparation process thereof, and the method comprises the following steps: (1) crushing and screening dolomite to obtain dolomite with proper particle size, and then roasting and screening to obtain light-burned dolomite with proper particle size; (2) analyzing test data of light-burned dolomite and light-burned magnesia, fully considering possible influence factors in a production process, and calculating a batching proportion; (3) respectively feeding the light-burned dolomite and the light-burned magnesia into an Euro mill by a belt conveyor for milling; (4) proportioning according to a certain proportion through a constant feeder; (5) uniformly mixing, feeding into a high-pressure ball press machine, and pressing to obtain semi-finished product balls; and (6) feeding the semi-finished product ball into a high-temperature rotary kiln for calcining, and cooling to obtain the magnesia-calcium sand. The invention provides the magnesia-calcium sand prepared by the method. The method is low in cost, simple in process and easy to implement. The magnesia-calcium sand has the advantages of high purity, high density, excellent hydration resistance, excellent alkaline slag erosion resistance and the like.

Description

technical field [0001] The invention relates to the technical field of refractory material preparation, in particular, the invention relates to a high-purity, high-density calcium-magnesia sand and a preparation process thereof. Background technique [0002] At present, steelmaking technology is increasingly advanced and clean, requiring refractory materials, such as magnesia-calcium sand, not only to have excellent resistance to high-alkaline slag erosion, but also to have excellent chemical stability and good high-temperature performance. To meet a variety of harsh conditions of use. [0003] At present, the preparation process of magnesia-calcium sand can be divided into one-step calcination process and artificial synthesis two-step calcination process. Among them, the one-step calcination process mainly relies on high-temperature firing to gradually change the dolomite ore into a dense sintered body. Since periclase and calcite are phases with high melting points, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/66
CPCC04B35/04C04B35/66C04B2235/77C04B2235/9669C04B2235/9692C04B2235/321
Inventor 梁春莲张慧凤李高平牛爱红李院高王滨
Owner SHANXI LUWEIBAO TAIGANG REFRACTORIES CO LTD