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Process for prepering active magnesium oxide

A technology of activated magnesia and light-burned magnesia, which is applied in the field of inorganic chemical industry, can solve the problems of raw material origin limitation, energy consumption and high production cost, and achieve the effects of low production cost, easy operation and reduced environmental pollution

Inactive Publication Date: 2006-06-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process of this method is simple, the energy consumption and production cost are relatively high, and the construction of the factory is limited by the origin of raw materials

Method used

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  • Process for prepering active magnesium oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Light burning. Add magnesite (MgO content is 44.0% by weight) into a roasting furnace, and roast at 800° C. for 60 minutes to obtain light-burned magnesium oxide.

[0028] 2. Cool down. Naturally cool the light-burned magnesia to 200°C in air.

[0029] 3. Hydration. Put the cooled light-burned magnesia into water 5 times the volume of the mineral, mix, add the mixed slurry into the ball mill tank, and ball mill for 40 minutes, then heat the ball-milled slurry to 160°C, Rapid hydration of MgO under temperature conditions to generate Mg(OH) 2 .

[0030] 4. Purification. Purify by filtering, keep the slurry and discard the filter residue.

[0031] 5. Dry. The slurry was dried at 160° C. for 10 hours to remove moisture.

[0032] 6. Ball milling. The dried Mg(OH) 2 Place in a ball mill jar and grind to -325 mesh.

[0033] 7. Calcining at low temperature. Mg(OH) after low temperature calcination and ball milling 2 , the calcination temperature is 500° C., and ...

Embodiment 2

[0035] 1. Light burning. Add magnesite (MgO content is 45.8% by weight) into a roasting furnace, and roast at 750° C. for 90 minutes to obtain light-burned magnesium oxide.

[0036] 2. Cool down. Naturally cool the light-burned magnesia to 250°C in air.

[0037] 3. Hydration. Put the cooled light-burned magnesia into water 4 times the volume of the mineral, mix, add the mixed slurry into the ball mill tank, ball mill for 45 minutes, and then heat the ball-milled slurry to 180°C, Rapid hydration of MgO under temperature conditions to generate Mg(OH) 2 .

[0038] 4. Purification. Purify by filtering, keep the slurry and discard the filter residue.

[0039] 5. Dry. The slurry was dried at 180° C. for 8 hours to remove moisture.

[0040] 6. Ball milling. The dried Mg(OH) 2 Place in a ball mill jar and grind to -325 mesh.

[0041] 7. Calcining at low temperature. Mg(OH) after low temperature calcination and ball milling 2 , the calcination temperature is 500 DEG C, the...

Embodiment 3

[0043] 1. Light burning. Add magnesite (MgO content is 47.0% by weight) into a roasting furnace, and roast at 700° C. for 120 minutes to obtain light-burned magnesium oxide.

[0044] 2. Cool down. Naturally cool the light-burned magnesia to 150°C in air.

[0045] 3. Hydration. Put the cooled light-burned magnesia into water 5 times the volume of the mineral, mix, add the mixed slurry into the ball mill tank, ball mill for 30 minutes, and then heat the ball-milled slurry to 120°C. Rapid hydration of MgO under temperature conditions to generate Mg(OH) 2 .

[0046] 4. Purification. Purify by filtering, keep the slurry and discard the filter residue.

[0047] 5. Dry. The slurry was dried at 120° C. for 15 hours to remove moisture.

[0048] 6. Ball milling. The dried Mg(OH) 2 Place in a ball mill jar and grind to -325 mesh.

[0049] 7. Calcining at low temperature. Mg(OH) after low temperature calcination and ball milling 2 , the calcination temperature is 550° C., and...

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Abstract

A process for preparing an active magnesium oxide from low-grade magnesite includes such steps as light burning at 600-800 deg.C, hydrating at 80-200 deg.C, filtering for purifying, drying, ball grinding and low-temp calcining at 450-600 deg.C. Its advantages are high quality, low cost and no pollution.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry and relates to a method for preparing metal oxides, in particular to a method for preparing active magnesium oxide. Background technique [0002] Activated magnesia is a new type of magnesium compound that has appeared in recent years. Because of its large specific surface area and high surface energy, it is a functional inorganic material, so it is widely used in wastewater treatment, plastic rubber modification and flue Gas desulfurization and other fields. For example, when activated magnesia is used as a desulfurizer for coal-fired flue gas desulfurization, it can not only greatly improve the desulfurization efficiency and effectively recover sulfur resources, but also solve the problems of scaling, corrosion and blockage of equipment during the desulfurization process. [0003] At present, the main production methods of activated magnesium oxide are as follows: [0004] ...

Claims

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Application Information

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IPC IPC(8): C04B2/10
Inventor 于景坤李环苏莉
Owner NORTHEASTERN UNIV
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