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A kind of preparation method of medical grade magnesium oxide

A technology of magnesium oxide and magnesium sulfate, applied in magnesium oxide and other directions, can solve the problems of high cost, difficult to meet product quality standards, complicated magnesium oxide preparation process, etc., and achieve the effects of simple operation, stable product quality, and good impurity removal effect.

Active Publication Date: 2016-08-31
SINOPHARM CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a preparation method of medical grade magnesium oxide, to overcome the defects in the prior art that the preparation process of magnesium oxide is complicated, the cost is high, and the product quality is difficult to meet the standard

Method used

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  • A kind of preparation method of medical grade magnesium oxide
  • A kind of preparation method of medical grade magnesium oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 100g of industrial magnesium sulfate to 800mL of pure water, add 2mL of 30wt% hydrogen peroxide, adjust the pH value to 9.5 with 15wt% ammonia water, add 5g of activated carbon, stir and react at room temperature for 2 hours, filter out the activated carbon by conventional vacuum filtration, and then filter the filtrate with a pore size of The 0.22 μm cellulose acetate microfiltration membrane is filtered, and the filtrate obtained is adjusted to 11.5 with 20wt% ammoniacal liquor, and stirred for 4 hours. / LBa(NO 3 ) 2 The solution was detected for the presence of sulfate ions, and a few drops of Ba(NO 3 ) 2 Solution in the washing liquid, when no precipitation occurs, it shows that the sulfate ion has been washed), and the gained solid is dried and roasted to obtain 95g of medical grade magnesium oxide.

Embodiment 2

[0022] Add 100g of industrial magnesium sulfate to 1200mL of pure water, add 10mL of 30wt% hydrogen peroxide, adjust the pH to 9.5 with 20wt% ammonia water, add 5g of activated carbon, stir and react at room temperature for 4 hours, filter out the activated carbon by conventional vacuum filtration, and then filter the filtrate with a pore size of 0.10 The cellulose acetate microfiltration membrane of μm is filtered, and the filtrate that obtains is adjusted pH to 12.0 with 30wt% ammoniacal liquor, and stirring reaction is 4 hours, and the filter cake that obtains after filtering washes residual sulfate ion with pure water (with a concentration of 0.1mol / LBa(NO 3 ) 2 The solution was tested for the presence of sulfate ions, and a few drops of Ba(NO 3 ) 2 Solution in the washing liquid, when no precipitation occurs, it shows that the sulfate ion has been washed), and the gained solid is dried and roasted to obtain 92g of medical grade magnesium oxide.

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Abstract

The invention discloses a preparation method of medical magnesium oxide, which comprises the following steps: dissolving the raw material industrial magnesium sulfate in pure water, adding oxydol, regulating the pH value of the solution with ammonia water, precipitating zinc, iron, aluminum and other metal impurity ions, adding activated carbon to perform adsorptive precipitation, filtering, collecting the obtained filtrate, regulating the pH value of the solution with ammonia water, enabling magnesium ions to form a magnesium hydroxide precipitate, filtering, washing, drying and roasting to obtain the medical magnesium oxide. The purity of the medical magnesium oxide prepared by the method is higher than 98.5%, the yield is greater than 90%, and the medical magnesium oxide satisfies the American Medical Magnesium Oxide Standard PHRA50-91-002 and American Food Additive Magnesium Oxide Standard MC30. Compared with the prior art, the method is simple to operate, has the advantages of low cost and stable product quality, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of preparation of magnesium oxide, in particular to a preparation method of medical grade magnesium oxide. Background technique [0002] Magnesium oxide is an important inorganic chemical product, mainly used in refractory materials and refining magnesium metal, and also used in building materials, paper, fertilizer, rubber and adhesives. With the continuous development of new materials, new technologies and new processes, the application of magnesium oxide in food, medicine, advanced ceramics, electronic products and other fields is expanding day by day, so the requirements for the purity of magnesium oxide are getting higher and higher. [0003] In the prior art, the preparation method of ordinary magnesium oxide usually adopts methods such as carbonization method, calcining method and hydrochloric acid method. Due to the limitation of raw materials and preparation methods, the obtained magnesium oxide product has l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/08
Inventor 郑琦柯德宏凌芳马骏陈浩云
Owner SINOPHARM CHEM REAGENT