CN1189457A - Tech. for preparing ultrapure magnesia from bittern - Google Patents
Tech. for preparing ultrapure magnesia from bittern Download PDFInfo
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- CN1189457A CN1189457A CN97105684A CN97105684A CN1189457A CN 1189457 A CN1189457 A CN 1189457A CN 97105684 A CN97105684 A CN 97105684A CN 97105684 A CN97105684 A CN 97105684A CN 1189457 A CN1189457 A CN 1189457A
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- bittern
- magnesium
- magnesia
- calcining
- tech
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Abstract
A process for preparing superhigh-purity magnesium sand from bittern includes addition of ammonia solution as precipitant to bittern to generate precipitate of magnesium hydroxide, light burning to obtain magnesium oxide, shaping, and calcining at 1500-1600 deg.C, and features high magnesium content in bittern, direct light burning of magnesium hydroxide without washing, use of the mother liquid after precipitation to prepare ammonia solution for reusing it three times, low calcine temp, high purity of product.
Description
The present invention relates to a kind of method of making magnesium compound, make method of magnesium oxide with ammonia precipitation process from bittern more specifically to a kind of.
At present, during from seawater or bittern production magnesia, generally adopt milk of lime to make precipitation agent, make it produce magnesium hydrate precipitate, through repeatedly calcining the purified hydrogen method of magnesium oxide after the washing.For example, when Japan produces highly-purity magnesite from seawater, after adding milk of lime and being settled out magnesium hydroxide, with the fresh water washing,, use seawer washing more earlier through light-burned, promptly so-called rehydration, machine-shaping is then calcined under the high temperature more than 1800 ℃ at last, makes product.This technology is comparatively complicated, needs to consume a large amount of fresh water, and cost is higher.
The object of the present invention is to provide a kind ofly to prepare the technology of ultrapure magnesia with ammoniacal liquor from bittern, it can remedy existing preparation technology's above-mentioned deficiency.
Technology of the present invention adds precipitation agent to bittern earlier and produces magnesium hydrate precipitate, the light-burned one-tenth magnesium oxide of the latter, and machine-shaping, calcining is characterized in that used precipitation agent is an ammoniacal liquor then, calcining is carried out under 1500～1600 ℃.
The advantage of this technology is to be that raw material Mg content wherein is higher relatively with the bittern, and magnesium hydrate precipitate is directly light-burned without washing, and the mother liquor behind the filtering-depositing is used to prepare ammoniacal liquor, can use repeatedly three times, can save a large amount of precipitation agents and fresh water, calcining temperature is lower, the purity height of product, cost is low.
Below by embodiment the present invention is described.
Embodiment is in 2 liters of beakers of 31 ° of Be ' bitterns that 1000 grams are housed, under constantly stirring, add ammoniacal liquor (volume ratio of ammoniacal liquor and seawater is 1: 3) with the seawater preparation, its pH is reached till 11.5, continue to stir 20 minutes, leach magnesium hydrate precipitate 100 grams, promptly obtained highly-purity magnesite 75 grams down in light-burned 3 hours at 900 ℃, wherein content of magnesia is 99.9%, calcium oxide is 0.1%, and boron oxide is 0.01%, and volume density is 3.3 gram per centimeters
3
Claims (1)
1. one kind prepares the technology of ultrapure magnesia from bittern, adds precipitation agent to bittern earlier and produces magnesium hydrate precipitate, the light-burned one-tenth magnesium oxide of the latter, machine-shaping, calcining is characterized in that used precipitation agent is an ammoniacal liquor then, and calcining is carried out under 1500～1600 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97105684A CN1189457A (en) | 1997-01-30 | 1997-01-30 | Tech. for preparing ultrapure magnesia from bittern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97105684A CN1189457A (en) | 1997-01-30 | 1997-01-30 | Tech. for preparing ultrapure magnesia from bittern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1189457A true CN1189457A (en) | 1998-08-05 |
Family
ID=5167996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97105684A Pending CN1189457A (en) | 1997-01-30 | 1997-01-30 | Tech. for preparing ultrapure magnesia from bittern |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1189457A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007088409A1 (en) * | 2006-01-31 | 2007-08-09 | Council Of Scientific And Industrial Research | An improved process for the preparation of magnesia (mgo) |
| CN109369156A (en) * | 2018-10-29 | 2019-02-22 | 武汉科技大学 | A kind of magnesia aggregate and preparation method thereof based on salt lake bittern |
-
1997
- 1997-01-30 CN CN97105684A patent/CN1189457A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007088409A1 (en) * | 2006-01-31 | 2007-08-09 | Council Of Scientific And Industrial Research | An improved process for the preparation of magnesia (mgo) |
| JP2009525253A (en) * | 2006-01-31 | 2009-07-09 | カウンシル・オブ・サイエンティフィック・アンド・インダストリアル・リサーチ | Improved method for producing magnesia (MgO) |
| AU2006337405B2 (en) * | 2006-01-31 | 2011-11-24 | Council Of Scientific And Industrial Research | An improved process for the preparation of magnesia (MGO) |
| CN101400606B (en) * | 2006-01-31 | 2013-05-22 | 科学与工业研究会 | An improved process for the preparation of magnesia (MgO) |
| CN109369156A (en) * | 2018-10-29 | 2019-02-22 | 武汉科技大学 | A kind of magnesia aggregate and preparation method thereof based on salt lake bittern |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |