CN102275960B - Preparation process and preparation device of anhydrous magnesium chloride - Google Patents
Preparation process and preparation device of anhydrous magnesium chloride Download PDFInfo
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- CN102275960B CN102275960B CN 201110180588 CN201110180588A CN102275960B CN 102275960 B CN102275960 B CN 102275960B CN 201110180588 CN201110180588 CN 201110180588 CN 201110180588 A CN201110180588 A CN 201110180588A CN 102275960 B CN102275960 B CN 102275960B
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- magnesium chloride
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- stationary ring
- hydrochloric acid
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- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 84
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 27
- 239000010439 graphite Substances 0.000 claims abstract description 27
- 230000018044 dehydration Effects 0.000 claims abstract description 14
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 9
- 238000005485 electric heating Methods 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 229940073589 magnesium chloride anhydrous Drugs 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 22
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 19
- 238000010521 absorption reaction Methods 0.000 claims description 18
- 235000011147 magnesium chloride Nutrition 0.000 claims description 18
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 claims description 16
- 229960002337 magnesium chloride Drugs 0.000 claims description 13
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 13
- 208000005156 Dehydration Diseases 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- DARFZFVWKREYJJ-UHFFFAOYSA-L magnesium dichloride dihydrate Chemical compound O.O.[Mg+2].[Cl-].[Cl-] DARFZFVWKREYJJ-UHFFFAOYSA-L 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 150000002431 hydrogen Chemical group 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 230000009184 walking Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims 1
- 239000002250 absorbent Substances 0.000 abstract 1
- 230000002745 absorbent Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 15
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides a preparation process of anhydrous magnesium chloride, and the preparation process comprises the following steps: introducing hydrogen chloride into a rotary kiln with a composite structure, and carrying out three-stage heating dehydration at the following heating ranges, namely, 160-220 DEG C, 180-380 DEG C and 330- 450 DEG C; and absorbing separated water with hydrogen chloride to obtain steam containing hydrogen chloride, introducing the steam containing hydrogen chloride into an integrated absorbing tower to form hydrochloric acid, and desorbing hydrochloric acid to generate hydrogen chloride for recycling. The preparation device of anhydrous magnesium chloride is the rotary kiln with the composite structure, and is composed of alternate three heating regions and four stationary seal rings, wherein the heating regions and the stationary seal rings are combined by a static and dynamic combined form; and the three heating regions can rotate and are in a cylindrical composite structure, the composite structure is composed of a steel plate layer, a flexible graphite layer and a graphite layer, and an electric heating pipe is pre-embedded in the graphite layer. By using hydrogen chloride as a water absorbent in the preparation method, the dehydration efficiency is significantly improved, hydrogen chloride is recycled and the consumption is less; the flexible graphite layer reduces the vibration when the device operates; and the graphite layer has high corrosion resistance.
Description
Technical field
The present invention relates to be prepared by magnesium chloride hexahydrate the method and apparatus of Magnesium Chloride Anhydrous.
Background technology
In industrial production, magnesium chloride hexahydrate prepares Magnesium Chloride Anhydrous, has multiple preparation method, but the energy consumption that has is high, and some technical process are complicated, some inefficiencies, the high-level efficiency that the shortage large-scale production needs, the maturation method of less energy-consumption.
MgCl26H2O
Number of patent application is that 200410041515.2 file discloses " process for producing anhydrous magnesium chloride by microwave energy ", at first realize the magnesium chloride hexahydrate moisture 1.5-2.0 magnesium chloride that dewaters to get in the first microwave heater, temperature is controlled at 100-120 ℃ by the magnesium chloride hexahydrate Four Modernizations magnesium chloride that dewaters to get, and temperature is controlled at 100-150 ℃ from the four aqueous magnesium chlorides moisture 1.5-2.0 magnesium chloride that dewaters to get; Then realize in the second microwave heater that moisture 1.5-2.0 magnesium chloride gets Magnesium Chloride Anhydrous, temperature is controlled at 150-350 ℃, the dewatering agent of the 1-10% that adds, and the chlorine add-on of protective atmosphere is for covering material surface-area consumption.The microwave heater size of this technique is less, and throughput is lower.
Number of patent application is that 200710179865.9 file discloses " method that is prepared Magnesium Chloride Anhydrous by bischofite ".Prepare Magnesium Chloride Anhydrous take bischofite as raw material, specific embodiment is as follows: (1) at first sloughs most of crystal water with the bischofite drying; (2) dried magnesium chloride is dissolved in the ethylene glycol solution of preparation magnesium chloride in ethylene glycol, adopts the vacuum distilling method to slough moisture in the ethylene glycol solution of magnesium chloride; (3) ethylene glycol solution of the magnesium chloride after the dehydration and ammonia react crystallization generate the magnesium chloride hex-ammoniate crystal; (4) washing, filtration, the dry magnesium chloride hex-ammoniate crystal that gets; (5) dry magnesium chloride hex-ammoniate thermal degradation Study of Deamination gets Magnesium Chloride Anhydrous.Adopt these raw materials of ethylene glycol and ammonia in this technique, improved production cost, increased environmental pollution.
Summary of the invention
Goal of the invention: overcome the defective that in traditional Magnesium Chloride Anhydrous preparation, efficient is low, energy consumption is high, a kind of preparation technology who consumes the Magnesium Chloride Anhydrous low, that dewatering efficiency is high is provided.Technical scheme: for realizing purpose of the present invention, adopt a kind of preparation technology of Magnesium Chloride Anhydrous, hydrogenchloride is passed in the composite-structure rotary kiln that loads magnesium chloride hexahydrate, minutes three grades, level Four, Pyatyi or six grades of dewatering tank by heatings; When dividing three grades, three grades of scopes of heating are respectively 160 ℃-220 ℃, 180 ℃-380 ℃ and 330 ℃-450 ℃, respectively corresponding three are decomposed dehydrations: by magnesium chloride hexahydrate become four aqueous magnesium chlorides process, by four aqueous magnesium chlorides become magnesium chloride dihydrate process, become the process of the Magnesium Chloride Anhydrous finished product of final needs by magnesium chloride dihydrate, thereby realize having magnesium chloride hexahydrate to become the preparation process of Magnesium Chloride Anhydrous; When being divided into level Four, Pyatyi or six grades, the scope of heating is divided into corresponding progression between 160 ℃-480 ℃, and corresponding four, five or six are progressively decomposed dehydration respectively, and each step can be taken off the water of one or more molecules.
In the present invention, the moisture of deviating from is chlorinated hydrogen and absorbs into containing hydrogen chloride steam, or first absorbs coolingly through quencher, then flows into integrated absorption tower and absorbs into hydrochloric acid.
Described three grades of scopes of heating are preferably 190 ℃-220 ℃, 330 ℃-350 ℃ and 400 ℃-450 ℃, and corresponding three are decomposed dehydration respectively.
Described heating is the heating of preferred employing electrothermal tube.
The speed of rotation of described composite-structure rotary kiln can be 10-100 rev/min.
Described hydrochloric acid can be again becomes hydrogenchloride through the resolving of resolving hydrochloric acid system and reclaims, and partial oxidation hydrogen can recycle for this technological process, and the acid waste water that the resolving hydrochloric acid system produces is discharged outside this process unit.
Another object of the present invention: a kind of preparation facilities that the preparation technology who realizes above-mentioned Magnesium Chloride Anhydrous is provided.
Realize this purpose technical scheme: the preparation facilities of Magnesium Chloride Anhydrous is a kind of composite-structure rotary kiln, by three, four, five or six heat zone and four or more stationary rings are alternate forms.
Be divided into three when heating the zone, three zones of heating can both rotate, and are respectively cold zone, middle warm area, high-temperature zone, the length 2m-18m in each zone of heating; Heating from beginning to end regional and heating is connected with stationary ring between the zone, heat and adopt the combining form of dynamic and static ring sealing between zone and stationary ring; The magnesium chloride hexahydrate entrance is on the 1st stationary ring, and on the 1st stationary ring, the 2nd stationary ring, the 3rd stationary ring, the hydrogenchloride entrance is on the 4th stationary ring respectively in the outlet of three containing hydrogen chloride steam, and Magnesium Chloride Anhydrous exports on the 4th stationary ring; Heat the zone for columned composite structure, be composited by three layers, steel plate layer, soft graphite layer, graphite linings, electric heating tube is embedded in graphite linings.The outlet of three containing hydrogen chloride steam is common connects one or connect respectively three integrated absorption towers, before connecting integrated absorption tower or first be connected with quencher.Integrated absorption tower or connect again the resolving hydrochloric acid system, the hydrogenchloride that the resolving hydrochloric acid system emits or the hydrogenchloride entrance that connects again composite-structure rotary kiln by pipeline.
The diameter in described three zones of heating can be 0.5m-3m, and the thickness of graphite linings can be 80mm-200mm, and the thickness of soft graphite layer can be 1.5mm-6mm.The diameter in three zones of heating and length can require design to determine according to production capacity.
The contact surface of described dynamic and static ring sealing is minute surface preferably, and the material of contact surface place stationary ring is preferably silicon carbide, and the heat material in zone of contact surface place is preferably graphite.
The gradient of 5 °-20 ° can be arranged when described composite-structure rotary kiln is installed and used, can drive material when heating the zone rotation and automatically be walked to the high-temperature zone by cold zone.
Described electric heating tube can be connected power supply with brush by slide block, and an end of brush is fixedly connected on stationary ring, guarantees that the supply lines of power supply with the rotation of this rotary kiln, entanglement does not occur.Described integrated absorption tower (17) top or be connected with vacuum pick-up system, suction hydrogenchloride steam can accelerate the dehydration of magnesium chloride.
Beneficial effect: the present invention adopts hydrogenchloride as the absorption agent of water, and hydrogenchloride finally parses, and does not participate in chemical reaction, is similar to the effect of catalyzer, can significantly improve dewatering efficiency.The classification of dewatering process subregion is carried out, and the dehydration link is clear, and ultimate dehydration is thorough.Vibration when the soft graphite layer of composite-structure rotary kiln can reduce the device running, smooth running reduces noise; The graphite linings erosion resistance is high, the life-span is permanent, and dynamic and static ring sealing is good, and friction resistance is little; Hydrogenchloride recycles, and consumes less, pollutes few.Dimensional change scope of the present invention is wide, is fit to the production and application of multiple production capacity; This device also is suitable for other multiple dehydration or drying treatment that contain inorganic substance with crystal water matter to be used.
Description of drawings
Accompanying drawing is structure and the process flow diagram of apparatus of the present invention.
In figure, 1, the magnesium chloride hexahydrate entrance; 2, the outlet of the 1st hydrogenchloride steam; 3, the outlet of the 2nd hydrogenchloride steam; 4, the outlet of the 3rd hydrogenchloride steam; 5, hydrogenchloride entrance; 6, the 1st stationary ring; 7, cold zone; 8, the 2nd stationary ring; 9, middle warm area; 10, the 3rd stationary ring; 11, high-temperature zone; 12, the 4th stationary ring; 13, Magnesium Chloride Anhydrous outlet; 14, absorption by Hydrochloric Acid tank; 15, waste liquid tank; 16, resolving hydrochloric acid system; 17, integrated absorption tower; 18, quencher.
Embodiment
Below, in conjunction with the accompanying drawings and embodiments the present invention is made more specific description.
As shown in drawings, selecting each component to be mounted to preparation facilities is composite-structure rotary kiln, heats zone and four stationary ring alternate compositions by three; Three zones of heating can both rotate, and are respectively cold zone 7, middle warm area 9, high-temperature zone 11, the length 4m-6m in each zone of heating.Heating from beginning to end regional and heating is connected with stationary ring between the zone, heat and adopt the combining form of dynamic and static ring sealing between zone and stationary ring; Magnesium chloride hexahydrate entrance 1 is on the 1st stationary ring, the outlet of the 1st hydrogenchloride steam is on the 1st stationary ring 6, the outlet 3 of the 2nd hydrogenchloride steam on the 2nd stationary ring 8, the outlet 4 of the 3rd hydrogenchloride steam is on the 3rd stationary ring 10, hydrogenchloride entrance 5 is on the 4th stationary ring 12, and Magnesium Chloride Anhydrous outlet 13 is on the 4th stationary ring 12.
Heat the zone for columned composite structure, be composited by three layers, steel plate layer, soft graphite layer, graphite linings, electric heating tube is embedded in graphite linings.The outlet of three containing hydrogen chloride steam is common connects one or connect respectively three integrated absorption towers 17.
Embodiment 1
Three described diameters of heating the zone are 2m, and the thickness of graphite linings is 150mm, and the thickness of soft graphite layer is 3mm.The contact surface of described dynamic and static ring sealing is minute surface, and the material of contact surface place stationary ring is silicon carbide, and the heat material in zone of contact surface place is graphite.Described electric heating tube is connected power supply by slide block with brush, and an end of brush is fixedly connected on stationary ring.The speed of rotation of described composite-structure rotary kiln is 60 rev/mins.
Embodiment 2
Three described diameters of heating the zone are 1.5m, and the thickness of graphite linings is 100mm, and the thickness of soft graphite layer is 2.5mm.The contact surface of described dynamic and static ring sealing is minute surface, and the material of contact surface place stationary ring is silicon carbide.Described composite-structure rotary kiln has the gradient of 10 ° when installing and using, drive material when heating the zone rotation automatically by cold zone 7 11 walkings to the high-temperature zone.Described electric heating tube is connected power supply by slide block with brush, and an end of brush is fixedly connected on stationary ring.The speed of rotation of described composite-structure rotary kiln is 30 rev/mins.
In above-described embodiment 1-2, hydrogenchloride is passed into the composite-structure rotary kiln that loads magnesium chloride hexahydrate from hydrogenchloride entrance 5, divide three grades of dewatering tank by heatings, three grades of scopes of heating in accompanying drawing are 190 ℃-220 ℃, 330 ℃-350 ℃ and 400 ℃-450 ℃, corresponding three are decomposed dehydration respectively, thereby realize having magnesium chloride hexahydrate to become the preparation process of Magnesium Chloride Anhydrous. described heating as adopting the electrothermal tube heating.
The moisture of deviating from is chlorinated hydrogen and absorbs into containing hydrogen chloride steam, then flows into integrated absorption tower 17 and absorb into hydrochloric acid.Before advancing integrated absorption tower 17 or first be connected with quencher 18; After hydrochloric acid flows out from integrated absorption tower 17, or connect again absorption by Hydrochloric Acid tank 14, connect again resolving hydrochloric acid system 16, the hydrogenchloride that resolving hydrochloric acid system 16 emits or connect again the hydrogenchloride entrance 5 of composite-structure rotary kiln by pipeline, recycle for this technological process, the acid waste water that resolution system produces enters waste liquid tank 15, discharges outside this process unit.
Claims (8)
1. the preparation facilities of a Magnesium Chloride Anhydrous, it is characterized in that: preparation facilities is composite-structure rotary kiln, by three, four, five or six heat zone and four or more stationary rings are alternate forms;
Be divided into three when heating the zone, three zones of heating can both rotate, and are respectively cold zone (7), middle warm area (9), high-temperature zone (11), the length 2m-18m in each zone of heating; Heating from beginning to end regional and heating is connected with stationary ring between the zone, heat and adopt the combining form of dynamic and static ring sealing between zone and stationary ring; Magnesium chloride hexahydrate entrance (1) is on the 1st stationary ring (6), the outlet of three containing hydrogen chloride steam is respectively on the 1st stationary ring (6), the 2nd stationary ring (8), the 3rd stationary ring (10), hydrogenchloride entrance (5) is on the 4th stationary ring (12), and Magnesium Chloride Anhydrous outlet (13) is on the 4th stationary ring (12); Heat the zone for columned composite structure, be composited by three layers, steel plate layer, soft graphite layer, graphite linings, electric heating tube is embedded in graphite linings; The outlet of three containing hydrogen chloride steam is common connects one or connect respectively three integrated absorption towers (17), connects integrated absorption tower (17) front or first be connected with quencher (18); Integrated absorption tower (17) or connect again resolving hydrochloric acid system (16), the hydrogenchloride that resolving hydrochloric acid system (16) emits or connect again the hydrogenchloride entrance (5) of composite-structure rotary kiln by pipeline.
2. the preparation facilities of Magnesium Chloride Anhydrous according to claim 1 is characterized in that: three described diameters of heating the zone are 0.5m-3m, and the thickness of graphite linings is 80mm-200mm, and the thickness of soft graphite layer is 1.5mm-6mm.
3. the preparation facilities of Magnesium Chloride Anhydrous according to claim 1 and 2, it is characterized in that: the contact surface of described dynamic and static ring sealing is minute surface, and the material of contact surface place stationary ring is silicon carbide, and the heat material in zone of contact surface place is graphite.
4. the preparation facilities of Magnesium Chloride Anhydrous according to claim 1, it is characterized in that: described composite-structure rotary kiln has the gradient of 5 °-20 ° when installing and using, and drives material when heating the zone rotation automatically by cold zone (7) (11) walking to the high-temperature zone.
5. the preparation facilities of Magnesium Chloride Anhydrous according to claim 1, it is characterized in that: described electric heating tube is connected power supply by slide block with brush, and an end of brush is fixedly connected on stationary ring; Described integrated absorption tower (17) top or be connected with vacuum pick-up system.
6. the preparation technology of a Magnesium Chloride Anhydrous, it is characterized in that: the preparation facilities that adopts Magnesium Chloride Anhydrous claimed in claim 1, hydrogenchloride is passed in the composite-structure rotary kiln that loads magnesium chloride hexahydrate minutes three grades, level Four, Pyatyi or six grades of dewatering tank by heatings by hydrogenchloride entrance (5);
When dividing three grades, three grades of scopes of heating are respectively 160 ℃-220 ℃, 180 ℃-380 ℃ and 330 ℃-450 ℃, respectively corresponding three are decomposed dehydrations: by magnesium chloride hexahydrate become four aqueous magnesium chlorides process, by four aqueous magnesium chlorides become magnesium chloride dihydrate process, become the process of the Magnesium Chloride Anhydrous finished product of final needs by magnesium chloride dihydrate, thereby realize having magnesium chloride hexahydrate to become the preparation process of Magnesium Chloride Anhydrous;
When being divided into level Four, Pyatyi or six grades, the scope of heating is divided into corresponding progression between 160 ℃-480 ℃, and corresponding four, five or six are progressively decomposed dehydration respectively, and each step can be taken off the water of one or more molecules;
The moisture of deviating from is chlorinated hydrogen and absorbs into containing hydrogen chloride steam, or first absorbs coolingly through quencher (18), then flows into integrated absorption tower (17) and absorbs into hydrochloric acid;
The speed of rotation of described composite-structure rotary kiln is 10-100 rev/min.
7. the preparation technology of Magnesium Chloride Anhydrous according to claim 6, it is characterized in that: described three grades of scopes of heating are 190 ℃-220 ℃, 330 ℃-350 ℃ and 400 ℃-450 ℃, corresponding three are decomposed dehydrations respectively.
8. the preparation technology of according to claim 6 or 7 described Magnesium Chloride Anhydrouss, it is characterized in that: the resolving that described hydrochloric acid passes through resolving hydrochloric acid system (16) again becomes the hydrogenchloride recovery, partial oxidation hydrogen recycles for this technological process, and the acid waste water that resolving hydrochloric acid system (16) produces is discharged outside this process unit.
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| CN103922371B (en) * | 2014-04-30 | 2016-05-11 | 中国科学院青海盐湖研究所 | A kind of preparation method of anhydrous magnesium chloride |
| CA2970335C (en) * | 2014-12-10 | 2021-05-11 | Alliance Magnesium Inc. | Process for producing magnesium metal by dehydrating dihydrate magnesium chloride |
| CN107998825B (en) * | 2017-12-07 | 2021-05-25 | 青海盐湖工业股份有限公司 | HCl tail gas purification device and HCl tail gas purification process |
| CN111453701A (en) * | 2020-05-09 | 2020-07-28 | 中国成达工程有限公司 | Recycling method and system of protective gas for drying and dehydration |
| CN115676859A (en) * | 2022-09-05 | 2023-02-03 | 中国科学院青海盐湖研究所 | Method and system for preparing anhydrous magnesium chloride |
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| CN1229400A (en) * | 1997-06-20 | 1999-09-22 | 挪威海德罗公开有限公司 | Process for producing anhydrous MgC12 |
| CN1429770A (en) * | 2002-01-01 | 2003-07-16 | 中国科学院青海盐湖研究所 | Method of preparing anhydrous magnesium chloride by dehydration of bischefite |
| CN101041448A (en) * | 2006-03-16 | 2007-09-26 | 谷亮 | Method for preparation of anhydrous magnesium chloride |
| CN101121536A (en) * | 2007-06-15 | 2008-02-13 | 浙江海虹控股有限公司 | Combination preparation method for anhydrous magnesium chloride and potassium sulphate |
-
2011
- 2011-06-30 CN CN 201110180588 patent/CN102275960B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1229400A (en) * | 1997-06-20 | 1999-09-22 | 挪威海德罗公开有限公司 | Process for producing anhydrous MgC12 |
| CN1429770A (en) * | 2002-01-01 | 2003-07-16 | 中国科学院青海盐湖研究所 | Method of preparing anhydrous magnesium chloride by dehydration of bischefite |
| CN101041448A (en) * | 2006-03-16 | 2007-09-26 | 谷亮 | Method for preparation of anhydrous magnesium chloride |
| CN101121536A (en) * | 2007-06-15 | 2008-02-13 | 浙江海虹控股有限公司 | Combination preparation method for anhydrous magnesium chloride and potassium sulphate |
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Application publication date: 20111214 Assignee: Nantong Long Trust Graphite Science and Technology Development Co., Ltd. Assignor: Chou Xiaofeng Contract record no.: 2013320000476 Denomination of invention: Preparation process and preparation device of anhydrous magnesium chloride License type: Exclusive License Record date: 20130531 |
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