CN1218768A - Method for extracting several magnesium compound from bittern - Google Patents
Method for extracting several magnesium compound from bittern Download PDFInfo
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- CN1218768A CN1218768A CN 97121044 CN97121044A CN1218768A CN 1218768 A CN1218768 A CN 1218768A CN 97121044 CN97121044 CN 97121044 CN 97121044 A CN97121044 A CN 97121044A CN 1218768 A CN1218768 A CN 1218768A
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- magnesium
- bittern
- light
- magnesium hydroxide
- magnesium compound
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Magnesium hydroxide among magnesium compounds extracted from bittern precipitated with ammonia water is separated into three parts, including active magnesium hydroxide, light magnesium oxide obtained through light burning, and high-purity magnesite obtained through calcination, forming and re-burning. Ammonia water used has the concentration of 6-7 wt% and the volume ratio to bittern of 3-5 to 1. Further processing can produce first-rate light magnesium oxide and fireproof agent. Producing several magnesium compounds simultaneously can shorten production period, raise equipment utilization and lower product cost.
Description
The present invention relates to a kind of production method of magnesium compound.
In the bittern behind seawater or the underground preparing salt by concentrating sea water a large amount of magnesium are arranged, the utilization that how to solve magnesium is the significant problem during the bittern chemical resource comprehensive utilizes.And during the bittern chemical resource comprehensive utilizes at present, extraction magnesium single extractive technique of general employing when being thing, promptly a kind of technology only produces a product, if produce multiple magnesium compound then must adopt several different methods, like this cycle of product long, complicated operation, the many utilization ratios of equipment used are low, and cost is just high.
The purpose of this invention is to provide and a kind ofly extract the method for multiple magnesium compound from bittern, it can remedy the above-mentioned deficiency of prior art.
Method of the present invention is precipitation agent with ammoniacal liquor, be settled out magnesium hydroxide from bittern, it is characterized in that magnesium hydroxide is divided into three parts, a part is active hydrogen magnesium oxide, obtain light magnesium oxide after second section is light-burned, third part is through light-burned, machine-shaping and heavily burn till highly-purity magnesite.
Method of the present invention can be produced multiple magnesium compound simultaneously, has shortened production life cycle, and the ability that adapts to market is strong, simplified control, the plant factor height, product cost is low.
Below by embodiment the present invention is described.
Embodiment 1
The bittern that in one 15 liters Circular glass cylinder, adds 5 liters 31 ℃ Be (degree Beaume), the ammoniacal liquor that with 15 liter weight percentage concentrations is 6-7% carries out precipitin reaction under continuous stirring condition, to pH be 11 when above, restir 20 minutes promptly filters or places 30 minutes after-filtration, dry Mg (OH)
2500g after the pulverizing, is divided into three parts to magnesium hydroxide, and wherein first part is that 100g active hydrogen magnesium oxide can be used as cigarette-gas desulfurizer or acid waste liquid water conditioner (its activity index iodine absorption value is 79.8mg/ gram Mg (OH)
2), second section 200g magnesium hydroxide is through 800 ℃ of light-burned stair oxidation magnesium (MgO content is 93%) or secondary oxidation magnesium (MgO content is below 93%) of being, third part 200g magnesium hydroxide after light-burned at 1500kg/cm
2Machine-shaping under the pressure was heavily burnt under 1500-1600 ℃ 3 hours then, promptly got highly-purity magnesite, and wherein content of magnesia is 99%, CaO content≤0.1% (weight percentage, down together), B
2O
3≤ 0.01%, its density is 3.3g/L.The volume ratio of used ammoniacal liquor of the present invention and bittern is controlled at 3-5: in 1 the scope.
Embodiment 2
The difference of present embodiment and embodiment 1 only is magnesium hydroxide is told for example 100 grams of a part, washes with 300g fresh water earlier, washes altogether 2 times, promptly gets the top grade light magnesium oxide through 800 ℃ after light-burned.The weight ratio of each used fresh water of washing and magnesium hydroxide is preferably 2-4: 1, and washing times all can for 1-2 time.
Embodiment 3
Present embodiment and embodiment 1 or embodiment 2 are basic identical, its difference only is and will tells a part in the magnesium hydroxide again, 100g for example, it is handled with the 5g Magnesium Stearate, be about to the former and the latter by 1: the weight ratio of 0.03-0.15 fully mixes, make the latter attached on the former the short grained surface, after handling like this, can be used as fire retardant.If it is mixed with organic high molecular compound again, can obtain having the superpolymer of flame retardant properties.
Claims (4)
1. method of extracting multiple magnesium compound from bittern, with ammoniacal liquor is that precipitation agent is settled out magnesium hydroxide, it is characterized in that magnesium hydroxide is divided into three parts, a part is active hydrogen magnesium oxide, obtain light magnesium oxide after second section is light-burned, third part is through calcining, machine-shaping and heavily burn till highly-purity magnesite.
2. the method for the multiple magnesium compound of extraction as claimed in claim 1, the concentration expressed in percentage by weight that it is characterized in that described ammoniacal liquor is 6-7%, the volume ratio of ammoniacal liquor and bittern is 3-5: 1.
3. the method for the multiple magnesium compound of extraction as claimed in claim 1 is characterized in that telling a part of magnesium hydroxide and washes with water 1-2 time, and each water yield is 2-4 times of magnesium hydroxide weight, washes after 800 ℃ of light-burned top grade light magnesium oxides that are.
4. as the method for claim 1 and the multiple magnesium compound of 2 described extractions, it is characterized in that telling a part of magnesium hydroxide again, it handled with Magnesium Stearate, with the former and the latter by 1: be fire retardant after the weight ratio of 0.03-0.15 mixes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97121044 CN1218768A (en) | 1997-11-29 | 1997-11-29 | Method for extracting several magnesium compound from bittern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97121044 CN1218768A (en) | 1997-11-29 | 1997-11-29 | Method for extracting several magnesium compound from bittern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1218768A true CN1218768A (en) | 1999-06-09 |
Family
ID=5176164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97121044 Pending CN1218768A (en) | 1997-11-29 | 1997-11-29 | Method for extracting several magnesium compound from bittern |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1218768A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563292B (en) * | 2007-12-14 | 2012-08-29 | 派诺尔斯管理服务公司 | Method for the production of sodium sulphate and magnesium hydroxide |
-
1997
- 1997-11-29 CN CN 97121044 patent/CN1218768A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563292B (en) * | 2007-12-14 | 2012-08-29 | 派诺尔斯管理服务公司 | Method for the production of sodium sulphate and magnesium hydroxide |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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