CN101037210A - Preparation method of magnesia - Google Patents
Preparation method of magnesia Download PDFInfo
- Publication number
- CN101037210A CN101037210A CNA2006100205026A CN200610020502A CN101037210A CN 101037210 A CN101037210 A CN 101037210A CN A2006100205026 A CNA2006100205026 A CN A2006100205026A CN 200610020502 A CN200610020502 A CN 200610020502A CN 101037210 A CN101037210 A CN 101037210A
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- gas
- chloride
- magnesia
- magnesium chloride
- preparation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a method of preparing oxide and calcium chloride by using low water magnesium chloride, calcium hydroxide emulsion and high temperature vapour as raw material. In the present invention, the high temperature vapour serves as heating medium, the low water magnesium chloride having a grain size of 20~1000um is injected into a hydrolytic reactor so as to execute heat exchange with the high temperature vapour and to take place hydrolytic reaction under the catalytic action of electromagnetic wave generated from the electromagnetic wave catalyst generator inside of the hydrolytic reactor, wherein the hydrolytic products are magnesia and chlorine hydride gas; the solid magnesia is carried into a gas-solid separator by means of the high-speed chlorine hydride and vapour gas stream, and then the magnesia fine powder is separated and collected; the gas phase is cooled by heat exchanger, and the chlorine hydride gas is conveyed into the chlorine hydride recovery system and is absorbed by calcium hydroxide emulsion to produce calcium chloride. The content of the obtained magnesia is up to 95%, the percent hydrolysis of low water magnesium chloride is up to 98%, the concentration of the obtained calcium chloride is 31~36 wt %. The present invention utilizes the high-temperature vapour, combines the catalytic action of electromagnetic wave generated from the electromagnetic wave catalyst generator, and has the advantages of high efficiency, low energy consumption, rapid reaction rate, simple and convenient operation and no environment pollution.
Description
Technical field
Involved in the present invention is by low aqueous magnesium chloride (MgCl
2H
2O-MgCl
23H
2O), calcium hydroxide emulsion and high-temperature vapor prepare the method for magnesium oxide and calcium chloride, the method of the definite usefulness of saying so " composite catalyzing fluidization hydrolysis " prepares the method for magnesium oxide and calcium chloride, belong to the fluidization reaction engineering, magnesium oxide and Calcium Chloride Production preparation field.
Magnesium oxide is a kind of important chemical basic material, be applied to the stopping composition and the strengthening agent of rubber, soft magnetic ferrite, paint, magnesium hydroxide, paper production, the softening agent that steel ball polishing agent, glass reinforced plastic are used and the top coat of siliconized plate, leather treatment, tackiness agent is done each fields of national product such as printing with reactive dye reserving agent.
Background technology
Chinese invention patent (01108759) discloses a kind of production method of magnesium oxide, and raw material can be carnallitite, crystallization magnesium chloride, basic magnesium chloride, Magnesium Chloride Anhydrous and carry potassium, carries the salt lake saturated bittern behind the boron, adopt the pyrolysis calcination method to produce magnesium oxide.To calcine warm territory is divided into 600-800 ℃ of light-burned, 800-1200 ℃ and heavily burns and three calcining temperature sections of 1200-1800 ℃ of dead roasting, adopt unique fluid charging process and twice calcining process to overcome three prior art processes complexity such as calcining of Aman method, the higher and high deficiency of production cost of energy consumption.
Chinese invention patent (200410072343) has related to field of inorganic chemical engineering.A kind of manufacture method of activated magnesia, be characterised in that by using natural water magnesite direct roasting to make activated magnesia, technology comprises that hydromagnesite after the pulverizing 450～800 ℃ of dynamic roastings 30～120 minutes, obtains the activated magnesia of iodine sorption value 80～120mgI/g.
But all there is the not high shortcoming of quality product in above two kinds of patent schemes!
Summary of the invention
The object of the present invention is to provide a kind of preparation method of magnesia, produce calcium chloride simultaneously.Promptly with the low aqueous magnesium chloride of the direct catalytic hydrolysis of the fluidised method of composite catalyzing, preparation magnesium oxide is produced calcium chloride simultaneously.To hang down aqueous magnesium chloride (MgCl
2H
2O-MgCl
23H
2O) in the powder input hydrolysis reactor, hydrolysis reaction is taken place rapidly in raw material under the hertzian wave catalysis that takes place with the hertzian wave catalyst generator that is installed in the hydrolysis reactor under the effect of high-temperature vapor air-flow.Generate magnesium oxide and hydrogen chloride gas.Product magnesium oxide powder reclaims through the magnesium oxide recovery system under the drive of (water vapour and hydrogen chloride gas are formed) of high hot phase thing, and the gas phase thing through after the interchanger cooling, makes calcium chloride with the calcium hydroxide emulsion circularly absorbing hydrogen chloride again.
This method utilizes high-temperature vapor to help the generation of hydrolysis reaction, and combines the hertzian wave katalysis that the hertzian wave catalyst generator takes place, and has advantages such as effect height, fast, the simple easy handling of speed, cost are low, free from environmental pollution.
Technology contents of the present invention comprises hydrolysis reaction device, magnesium oxide gathering system, hydrogenchloride recovery system.
The method that the present invention proposes is with the high-temperature vapor heating medium, granular size is imported in the hydrolysis reactor at the low aqueous magnesium chloride of 20-1000 μ m, and heat exchange between the high-temperature vapor, and the hertzian wave catalysis that takes place of the hertzian wave catalyst generator in hydrolysis reactor issues unboiled water and separates reaction, temperature remains on 300-750 ℃, hydrolysis reaction takes place rapidly in low aqueous magnesium chloride, and product is magnesium oxide powder and hydrogen chloride gas.The gas phase thing air-flow that solid product magnesium oxide is made up of high speed hydrogenchloride and water vapour is brought gas-solid separator into, the separated and collection at this magnesium oxide powder.Again with the gas phase thing after interchanger cooling, with calcium hydroxide emulsion circularly absorbing hydrogen chloride system calcium chloride.
Description of drawings
Accompanying drawing has provided implements equipment configuration synoptic diagram of the present invention.This covering device is made up of hydrolysis reactor, gas-solid separator, interchanger, absorption tower, tail gas tower, tail gas pump, surge tank.
Device 1 is a hydrolysis reactor, and the high-temperature vapor air-flow that import 2 feeds enters hydrolysis reactor 1, makes the low aqueous magnesium chloride (MgCl that is added by charging opening 3
2H
2O-MgCl
23H
2O) powders flowing purification.Wherein low aqueous magnesium chloride contact with high-temperature vapor, and the hertzian wave catalysis of 18 generations of the hertzian wave catalyst generator in hydrolysis reactor issues unboiled water and separates reaction, generation magnesium oxide and hydrogen chloride gas.To reactor top, the temperature maintenance in the whole hydrolysis reactor is at 300-750 ℃ with gas delivery for reaction product.Magnesium oxide and high-temperature gas are entered in the gas-solid separator 5 by pipeline 4, after magnesium oxide is able to Separation and Recovery, after gas phase thing (water vapour and hydrogen chloride gas) entered interchanger 7 coolings by pipeline 6, wherein part water vapour and most hydrogen chloride gas were condensed into hydrochloric acid in the gas phase thing.The hydrochloric acid of condensation is sent into hydrogen chloride gas resorber 11 through pipeline 19 and is made calcium chloride with the calcium hydroxide emulsion reaction, remaining hydrogen chloride gas and water vapour are then successively by in pipeline 8, the surge tank 9, enter by hydrogen chloride absorption tower 11, pipeline 12, tail gas tower 13, pipeline 14, surge tank 15 and pipeline 16, hydrogenchloride recovery system and calcium hydroxide emulsion circulation absorption reaction that tail gas pump 17 is formed make calcium chloride.
Preparation method of magnesia involved in the present invention is with high-temperature vapor, calcium hydroxide emulsion and low aqueous magnesium chloride (MgCl
2H
2O-MgCl
23H
2O) be raw material, can obtain magnesium oxide and calcium chloride product.Technological process simply is easy to control, and the equipment capacity scope is big, is more suitable for large-scale industrial production, and the hydrogenchloride component in the product gas phase is fully reclaimed, and makes calcium chloride.
The product index that reaches is as follows:
One, content of magnesia is greater than 95%
Two, calcium chloride concentration 31-36%
Three, the hydrogenchloride rate of recovery is greater than 98%
Embodiment
To hang down aqueous magnesium chloride (MgCl
2H
2O-MgCl
23H
2O) fine powder (20-1000 μ m) is sent into the relevant condition of control in the hydrolysis reactor.
The high-temperature vapor inlet air temperature is 680 ℃, regulates the inlet amount of low aqueous magnesium chloride, and temperature is 588 ℃ in the hydrolysis reactor, and the pressure-controlling of hydrolysis reactor is-500-1000mmH
2O.
The result that the foregoing description obtained is as follows:
One, low aqueous magnesium chloride percent hydrolysis is greater than 98%
Two, content of magnesia is greater than 95%
Three, calcium chloride concentration 31-36%
Four, do not have gas leak in system and the production process, contamination-free is discharged.
Claims (4)
1, a kind of preparation method of magnesia, be to be heating medium with the high-temperature vapor, granular size is imported in the hydrolysis reactor at the low aqueous magnesium chloride (hydrated magnesium chloride that contains 1-3 water molecules) of 20-1000 μ m, with the heat exchange of high-temperature vapor inter gas, and the hertzian wave catalysis that taken place of the hertzian wave catalyst generator in hydrolysis reactor issues unboiled water and separates reaction, hydrolysis reaction takes place rapidly in low aqueous magnesium chloride, and product is magnesium oxide and hydrogen chloride gas.The gas phase thing that solid product magnesium oxide is made up of high speed hci gas flow and water vapour air-flow is brought gas-solid separator into, the separated and collection at this magnesium oxide powder.Again with the gas phase thing after interchanger cooling, make calcium chloride with the calcium hydroxide emulsion circularly absorbing hydrogen chloride.It is characterized in that: heating medium is a high-temperature vapor, and low aqueous magnesium chloride is the hydrated magnesium chloride that contains 1-3 water molecules.
2, a kind of preparation method of magnesia according to claim 1 is characterized in that: the gas phase thing makes the calcium chloride solution of high density with the calcium hydroxide emulsion circularly absorbing hydrogen chloride after the interchanger cooling.
3, a kind of preparation method of magnesia according to claim 1 is characterized in that: the hertzian wave catalyst generator in the described hydrolysis reactor is infrared generator or microwave generating apparatus.
4, a kind of preparation method of magnesia according to claim 1 is characterized in that: the hertzian wave catalyst generator in the described hydrolysis reactor is infrared generator and microwave generating apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100205026A CN101037210A (en) | 2006-03-17 | 2006-03-17 | Preparation method of magnesia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100205026A CN101037210A (en) | 2006-03-17 | 2006-03-17 | Preparation method of magnesia |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101037210A true CN101037210A (en) | 2007-09-19 |
Family
ID=38888418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100205026A Pending CN101037210A (en) | 2006-03-17 | 2006-03-17 | Preparation method of magnesia |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101037210A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108473331A (en) * | 2016-01-19 | 2018-08-31 | 普拉克生化公司 | The method for handling the improved method of magnesium chloride solution and preparing carboxylic acid |
| CN113008726A (en) * | 2021-04-09 | 2021-06-22 | 河北大有镁业有限责任公司 | Device and method for determining components of ammonium carnallite dehydrated material |
-
2006
- 2006-03-17 CN CNA2006100205026A patent/CN101037210A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108473331A (en) * | 2016-01-19 | 2018-08-31 | 普拉克生化公司 | The method for handling the improved method of magnesium chloride solution and preparing carboxylic acid |
| CN108473331B (en) * | 2016-01-19 | 2021-03-12 | 普拉克生化公司 | Improved method for treating magnesium chloride solution and method for preparing carboxylic acid |
| CN113008726A (en) * | 2021-04-09 | 2021-06-22 | 河北大有镁业有限责任公司 | Device and method for determining components of ammonium carnallite dehydrated material |
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