Method for preparing magnesian by calcining ammonium salt and magnesium-containing ore

A technology of magnesium ore and magnesium oxide, applied in lime production, etc., can solve problems such as high energy consumption, and achieve the effects of reducing energy consumption, reducing raw material consumption, and reducing production costs

Inactive Publication Date: 2009-02-25
王央贡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that this method not only has the same shortcomings as the acid leaching method, but also has the problem of high energy consumption caused by high-temperature calcination.

Method used

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  • Method for preparing magnesian by calcining ammonium salt and magnesium-containing ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) 1 part of 100 mesh serpentine powder is mixed with 2.0 parts of 60 mesh ammonium chloride and put into the reactor with ammonia purifier and ammonia absorber, and the reactor is placed in the heating furnace and gradually heated to 300-350°C, when the ammonia produced by calcination is released, dissolve the leached and calcined product with 10 parts of water, filter to obtain a crude magnesium chloride solution, and recover the released ammonia;

[0019] (2) react with the ammonia that reclaims after adopting conventional method to refine thick magnesium chloride solution and obtain magnesium hydroxide precipitation;

[0020] (3) Washing and drying the precipitated magnesium hydroxide obtained by filtration is placed in a calciner, and calcined at 900-950° C. for 3 hours to obtain 0.35 parts of magnesium oxide;

[0021] (4) The ammonium chloride solution from which the magnesium hydroxide precipitate was separated was evaporated, concentrated and crystallized, and ...

Embodiment 2

[0022] Embodiment 2: Mix 1 part of 100 mesh dolomite powder with 1.6 parts of 100 mesh ammonium sulfate, other steps and process conditions are the same as in Example 1, and the ammonium salt recovered is ammonium sulfate.

Embodiment 3

[0024] (1) Mix 1 part of 100-mesh magnesite powder with 2.5 parts of 60-mesh ammonium chloride and put it into a reactor with ammonia gas purifier and ammonia absorber, and place the reactor in a heating furnace to gradually heat to 200°C, and finally raise the temperature to 350°C, when the ammonia produced by calcination is released, dissolve the leached and calcined product with 10 parts of water, filter to obtain a crude magnesium chloride solution, and dissolve the released ammonia with water to obtain ammonia water;

[0025] (2) first the carbon dioxide that calcined basic magnesium carbonate precipitation produces is inserted in ammoniacal liquor and obtains ammonium bicarbonate solution, then ammonium bicarbonate solution is added in the refined magnesium chloride solution and reacted to obtain basic magnesium carbonate precipitation;

[0026] (3) washing and drying the basic magnesium carbonate precipitate obtained by filtration, placing it in a calciner, and calcining...

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Abstract

A method for preparing magnesium oxide by the mixed calcination of aminium salts and magniferous ores solves the problems existing in the existing method, such as high material cost, large project investment, high energy consumption and inconvenient use of side products. The method comprises the following steps: (1) magniferous ores are mixed with aminium salts; after calcination and aqueous extract, crude magnesium salt solution is obtained, and ammonia generated by the calcination is recovered, or ammonia generated by calcination is dissolved by water to obtain ammonia water; (2) after the crude magnesium salt solution is refined, the refined magnesium salt solution reacts with the restored ammonia to obtain magnesium hydroxide precipitate; or after ammonia water reacts with carbon dioxide generated by calcining basic magnesium carbonate precipitate to obtain ammonium acid carbonate solution, the ammonia water reacts with the magnesium salt solution to obtain basic magnesium carbonate precipitate once again; (3) the precipitates are separated and washed, magnesium oxide is obtained by drying and calcining, and the carbon dioxide generated by calcining basic magnesium carbonate precipitate is collected; (4) aminium salt solution, the precipitates of which are separated, is evaporated, concentrated and crystallized, and then is recovered to obtain aminium salts. In the invention, acid and precipitating agents used in the traditional technology are omitted. Therefore, the investment is reduced, and the material cost is lowered. In addition, the side product (aminium salts) can be circularly used, thus reducing the pollution.

Description

technical field [0001] The invention belongs to a method for preparing magnesium oxide, in particular to a chemical method for preparing magnesium oxide by mixing and calcining ammonium salt and magnesium-containing ore powder. Background technique [0002] The methods for producing magnesium oxide from magnesium-containing ores include calcination and acid leaching. The calcination method is to first cleavage the magnesium in the ore by calcination, then dissolve the magnesium compound into an aqueous solution with a solvent, and finally use a precipitant to dissolve the magnesium compound. Precipitate and calcinate to obtain magnesium oxide and ammonium salt as a by-product. The acid leaching method is to use strong acid to boil together with ore powder to obtain an aqueous solution of magnesium salt, then precipitate and calcinate to obtain magnesium oxide and by-product ammonium salt. For those magnesium compounds wrapped in silicate, such as serpentine, forsterite, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
CPCY02P40/40
Inventor 王央贡王文均王峰王玄彧
Owner 王央贡
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