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Preparation method for high-purity magnesium oxide

A magnesia, high-purity technology, applied in magnesia and other directions, can solve the problems of large consumption of raw materials and low product purity, and achieve the effects of easy control, high product purity, and simple production process equipment

Active Publication Date: 2015-01-21
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of large raw material consumption and low product purity in the prior art, and provide a method for preparing high-purity magnesium oxide with high product purity and low production cost

Method used

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  • Preparation method for high-purity magnesium oxide

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Experimental program
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Effect test

Embodiment 1

[0015] Such as figure 1 As shown, take 100g of magnesite, crush it to 10-50mm, and calcinate it in the calciner I at 800°C for 2 hours to generate light-burned magnesium; take 10g of light-burned magnesium, crush it to 30 mesh, and add it to 143mL The ammonium sulfate mother liquor with a fraction of 5% is heated to boiling and distilled to form a mixture of magnesium sulfate solution and ammonia gas and water. When the distillate volume is 60% of the original solution volume, stop heating, and the distilled ammonia gas and water After being cooled by the ammonia cooling tower, the mixture is absorbed by the CO from the storage tank I in the ammonia absorption tower 3 2- The carbonized ammonia water Ⅰ with a mass fraction of 3% is absorbed to form carbonized ammonia water II and enters the storage tank II, and the carbonized ammonia water II from the storage tank II is carbonized by the flue gas from the washing cooling tower in the carbonization tower to generate NH 4 + wi...

Embodiment 2

[0017] Such as figure 1 As shown, take 100g of magnesite, crush it to 10-50mm, and calcinate it in the calciner I at 600°C for 5 hours to generate light-burned magnesium; take 10g of light-burned magnesium, crush it to 30 mesh, and add it to 250mL In the ammonium sulfate mother liquor with a fraction of 10%, it is heated to boiling and distilled to form a mixture of magnesium sulfate solution and ammonia gas and water. When the distillate volume is 40% of the original solution volume, stop heating, and the distilled ammonia gas and water After being cooled by the ammonia cooling tower, the mixture is absorbed by the CO from the storage tank I in the ammonia absorption tower 3 2- The carbonized ammonia water Ⅰ with a mass fraction of 6% is absorbed to form carbonized ammonia water II and enters the storage tank II, and the carbonized ammonia water II from the storage tank II is absorbed by the CO from the calciner I in the carbonization tower. 2 carbonization to NH 4 + with...

Embodiment 3

[0019] Such as figure 1 As shown, take 100g of magnesite, crush it to 10-50mm, and calcinate it in the calciner I at 700°C for 4 hours to generate light-burned magnesium; take 10g of light-burned magnesium, crush it to 30 mesh, and add it to 500mL The ammonium sulfate mother liquor with a fraction of 20% is heated to boiling and distilled to form a mixture of magnesium sulfate solution and ammonia gas and water. When the distillate volume is 20% of the original solution volume, stop heating, and the distilled ammonia gas and water After being cooled by the ammonia cooling tower, the mixture is absorbed by the CO from the storage tank I in the ammonia absorption tower 3 2- The carbonized ammonia water Ⅰ with a mass fraction of 8% is absorbed to form carbonized ammonia water II and enters the storage tank II. The carbonized ammonia water II from the storage tank II is absorbed by the CO from the calciner II in the carbonization tower. 2 carbonization to NH 4 + with CO 3 2-...

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Abstract

The invention discloses a preparation method for high-purity magnesium oxide. The preparation method for high-purity magnesium oxide comprises the following steps of: calcining magnesite to generate caustic calcined magnesite; heating the caustic calcined magnesite and ammonium salt mother liquor to boil, and distilling; absorbing the distilled mixture of ammonia gas and water by carbonated aqueous ammonia I to form carbonated aqueous ammonia II; carbonizing the carbonated aqueous ammonia II by CO2 from a calcining furnace or flue gas from a washing-cooling tower in a carbonization tower to generate the carbonated aqueous ammonia I, and conveying the carbonated aqueous ammonia I in a storage tank I; conveying a part of the carbonated aqueous ammonia I entering in the storage tank I in an ammonia absorption tower for recycling; mixing the other part of the carbonated aqueous ammonia I with the magnesium salt solution formed by distillation in a reaction kettle, so as to generate basic magnesium carbonate and ammonium salt; filtering and conveying the ammonium salt in the reaction kettle for recycling; and calcining basic magnesium carbonate to prepare high-purity magnesium oxide. According to the preparation method for high-purity magnesium oxide disclosed by the invention, by recycling CO2 and ammonia gas generated during the reaction process, the problem of high raw material consumption due to massive use for ammonium bicarbonate during the production process is solved, and the production cost is reduced; and moreover, the product is high in purity, and the production process is simple in equipment and capable of being used for industrial production for high-purity magnesium oxide.

Description

technical field [0001] The invention belongs to the technical field of magnesium oxide preparation, and in particular relates to a preparation method of high-purity magnesium oxide. Background technique [0002] High-purity magnesia is a kind of magnesia whose mass fraction is higher than 98%. Among them, high-purity magnesium oxide can be used in special porcelain crucibles, electrical insulation products and capacitors, etc., because of its excellent optical, electrical and mechanical properties and chemical properties, it has great potential in optical transparent materials, high temperature resistant devices, laser materials, etc. application potential. At the same time, because of its good high-temperature flexural strength, slag resistance and corrosion resistance, it can improve the service life of the steelmaking furnace lining, and is widely used as a lining refractory material for steelmaking furnaces. High-quality materials; high-purity magnesium oxide can also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/02
Inventor 白云山梅宇王小彦王科旺史佳妮
Owner SHAANXI NORMAL UNIV
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