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Stable magnesia-calcium sand and preparation method thereof

A magnesia-calcium sand and stabilization technology, which is applied in the field of stabilized magnesia-calcium sand and its preparation, can solve difficult problems such as easy hydration, and achieve the effects of saving magnesite resources, improving hydration resistance, and stabilizing performance

Inactive Publication Date: 2015-05-06
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, measures to improve the hydration resistance of magnesium-calcium materials mainly focus on increasing the sintering temperature of raw materials, adding sintering agents and coating organic matter on the surface of materials to reduce CaO and H. 2 O reactivity, the purpose of improving the hydration resistance, but the CaO in the magnesium-calcium material still exists in the form of free state, it is difficult to solve the characteristics of easy hydration

Method used

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  • Stable magnesia-calcium sand and preparation method thereof
  • Stable magnesia-calcium sand and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 54.5% of light-burned dolomite, 31.5% of light-burned magnesia and 14% of quartz sand fine powder according to weight percentage; add 1.0% Fe 2 o 3 , 1.5% Ca 3 (PO 4 ) 2 . Lightly burned dolomite is fully digested by adding water; each raw material is put into a drum mill for wet co-grinding for 1 hour, so that the raw materials are mixed evenly and the particle size is ≤0.044mm; the mixture is extruded after dehydration, and the After drying, the green body is put into an electric furnace for sintering, the sintering temperature is 1650°C and kept for 5 hours, and after cooling, it is broken into granules to obtain stable magnesia-calcium sand.

Embodiment 2

[0030] plus 1.0% H 3 BO 3 Replace 1.5% Ca 3 (PO 4 ) 2 , and all the other steps are the same as in Example 1.

[0031] In embodiment 1 and embodiment 2, CaO content is 31% in the stable magnesia-calcium sand, and CaO / SiO 2 The molar ratio was 2.3.

Embodiment 3

[0033] Weigh 53.5% of light-burned dolomite, 34% of light-burned magnesia, and 12.5% ​​of quartz sand fine powder according to weight percentage; add 1.5% Fe 2 o 3 , 1.0% Ca 3 (PO 4 ) 2 . Add water to the lightly burned dolomite to fully digest it; put each raw material into a roller mill for wet co-grinding for 1 hour, so that the raw materials are mixed evenly and the particle size is ≤0.044mm; Dry under the condition of ℃; after the green body is dried, put it into the electric furnace for sintering, the sintering temperature is 1700 ℃ for 3 hours, and after cooling, it is broken into granules to obtain stable magnesia-calcium sand.

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Abstract

The invention relates to stable magnesia-calcium sand. The stable magnesia-calcium sand is characterized by being prepared from the following components in percentage by weight: 53-55% of light-burned dolomite, 32.5-35.5% of caustic-calcined magnesite, 11-14% of silica fine powder, 1-1.5% of a stabilizer and 1-1.5% of Fe2O3 which is taken as a sintering agent. The preparation method comprises the following steps: mixing; molding; drying; holding the temperature at 1650-1700 DEG C for 3-6 hours; and sintering. The stable magnesia-calcium sands provided by the invention maintain a good high-temperature performance and CaO exists in form of combined-state beta-2CaO.SiO2 and 3CaO.SiO2 so that the problem that a magnesia-calcium material is easily hydrated is solved. Under the condition of no hydration prevention measures, the requirements for production, long-term storage and application can be satisfied. The product has the following main balanced phase components at a high temperature: periclase, beta-2CaO.SiO2 and 3CaO.SiO2 which are high-melting-point mineral phases, the lowest eutectic point temperature of the three is about 1850 DEG C. A burnt brick is prepared by using the stable magnesia-calcium sands, the refractoriness under load of the burnt brick is greater than 1650 DEG C, and the good high-temperature performance of the magnesia-calcium material is maintained.

Description

technical field [0001] The invention belongs to the technical field of alkaline refractory raw materials, and in particular relates to a stabilized magnesia-calcium sand and a preparation method thereof. Background technique [0002] Magnesia-calcium material has excellent high-temperature performance and use effect. It can replace magnesia-chrome bricks in the high-temperature zone of cement kiln and avoid the pollution of hexavalent chromium. It is a kind of refractory material without environmental pollution. The raw materials used in the production of magnesium-calcium materials are large reserves of dolomite and limestone, which are far more abundant than magnesite resources; moreover, magnesium-dolomite mines are widely distributed, and almost every province has them. In the process of use, local materials can be obtained to develop magnesium-calcium The material is more economical and reasonable. Magnesium-calcium refractories have become the development trend of bas...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 赵飞葛铁柱钟香崇任桢马成良孟维
Owner ZHENGZHOU UNIV
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