Process for preparing hydration-resistance high-calcium magnesia-calcium sand

A technology for the preparation of high-calcium-magnesium-calcium sand, which is applied in the field of preparation technology for hydration-resistant high-calcium-magnesium-calcium sand, can solve problems such as poor operating conditions, high energy consumption, and environmental pollution, and achieve reduced production costs and water-resistant Good chemical properties and the effect of improving sintering activity

Inactive Publication Date: 2010-04-07
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy consumption of the two-step sintering method is high, and the operating conditions are extremely poor when used on a large scale, which is likely to cause environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Fully finely grind the high-purity dolomite, and the particle size of the powder is less than 10um;

[0023] (2), put the fine powder obtained in step (1) into a high-speed kneading machine, add an aqueous solution of polyvinyl alcohol with a mass ratio of 5 to 10% of high-purity dolomite powder, and fully knead to obtain a uniform wet powder without dry powder ;

[0024] (3), the wet powder that step (2) obtains is pressed into billet;

[0025] (4), the wet billet that step (3) is obtained, dry naturally for 24 hours, then enter 120 ℃ drying room and dry for 30 hours;

[0026] (5), put the dry base obtained in step (4) into a kiln for firing at a firing temperature of 1650° C., and heat it for 8 hours to obtain high-calcium-magnesium-calcium sand.

Embodiment 2

[0028] (1) Fully finely grind the high-purity dolomite, and the particle size of the powder is less than 10um;

[0029] (2), put the fine powder obtained in step (1) into a high-speed kneading machine, add an aqueous solution of polyvinyl alcohol with a mass ratio of 5 to 10% of high-purity dolomite powder, and fully knead to obtain a uniform wet powder without dry powder ;

[0030] (3), the wet powder that step (2) obtains is pressed into billet;

[0031] (4), the wet billet that step (3) is obtained, dry naturally for 36 hours, then enter 130 DEG C of drying room and dry for 25 hours;

[0032] (5), put the dry base obtained in step (4) into a kiln for firing at a firing temperature of 1680° C., and keep it warm for 6 hours to obtain high-calcium-magnesium-calcium sand.

Embodiment 3

[0034] (1) Fully finely grind the high-purity dolomite, and the particle size of the powder is less than 10um;

[0035] (2), put the fine powder obtained in step (1) into a high-speed kneading machine, add an aqueous solution of polyvinyl alcohol with a mass ratio of 5 to 10% of high-purity dolomite powder, and fully knead to obtain a uniform wet powder without dry powder ;

[0036] (3), the wet powder that step (2) obtains is pressed into billet;

[0037] (4), the wet billet that step (3) is obtained, dry naturally for 48 hours, then enter 140 ℃ drying room and dry for 20 hours;

[0038] (5), put the dry base obtained in step (4) into a kiln for firing at a firing temperature of 1700° C., and keep it warm for 4 hours to obtain high-calcium-magnesium-calcium sand.

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Abstract

The invention belongs to a process for preparing magnesia-calcium sand for use in clean steel smelting. The process for preparing the hydration-resistance high-calcium magnesia-calcium sand comprises the following steps of: grinding highly purified dolomite until the size of the obtained fine powder is less than 10mum; putting the fine powder in a high-speed mixer, adding aqueous solution of polyvinyl alcohol in an amount which is 5 to 10 percent of the weight of the highly purified dolomite powder in the mixer, fully mixing the mixture and obtaining uniform wet powder, and pressing the wet powder to obtain finished blanks; burning the dry blanks obtained by drying the finished blanks at a temperature of between 1,650 and 1,700 DEG C to obtain the high-calcium magnesia-calcium sand. The method is characterized by improving sintering activity of the dolomite by mechanical activation, avoiding any additional sintering auxiliary agent, preparing the high-calcium magnesia-calcium sand in high density by the one-step calcining at a lower temperature, effectively lowering production cost, simplifying production process and ensuring purity of the magnesia-calcium sand.

Description

technical field [0001] The invention belongs to a preparation process of magnesia-calcium sand for clean steel smelting, in particular to a preparation process of hydration-resistant high-calcium magnesia-calcium sand. Background technique [0002] According to the development strategy of China's transformation from a big steel country to a steel power, my country will vigorously develop high-quality and clean high-quality steel in the future. The production of clean steel requires that refractory materials have a long service life, do not pollute molten steel, and preferably have the effect of purifying molten steel. At the same time, only magnesia-calcium refractories containing free CaO have these performances, and theory and experiments have proved that magnesia-calcium refractories with high CaO content (≥50%) have a better purification effect on molten steel. [0003] However, the hydration problem in the process of production, storage and transportation has always be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/03C04B35/622C04B35/66
Inventor 周会俊张立明王龙光刘鹏
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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