CN110240185A - The production method of high purity magnesium hydroxide - Google Patents
The production method of high purity magnesium hydroxide Download PDFInfo
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- CN110240185A CN110240185A CN201910592102.XA CN201910592102A CN110240185A CN 110240185 A CN110240185 A CN 110240185A CN 201910592102 A CN201910592102 A CN 201910592102A CN 110240185 A CN110240185 A CN 110240185A
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- magnesium hydroxide
- brine
- ammonia
- high purity
- production method
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/28—Chlorides by chlorination of alkaline-earth metal compounds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/20—Magnesium hydroxide by precipitation from solutions of magnesium salts with ammonia
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention provides a kind of production methods of high purity magnesium hydroxide, are related to the technical field of magnesium hydroxide manufacture, comprising the following steps: making from brine is standby；Solution filtering；Preparation step；Mixing step；Heating stepses.By forming brine to wash water purification and impurity removal, and adjusting is filtered to brine, brine is refined to be formed, brine will be refined afterwards and ammonia hybrid reaction formation magnesium hydroxide is fixed and ammonium chloride solution, after separation of solid and liquid, solution is mixed with lime, form the mixed liquor of calcium chloride and ammonium hydroxide, and ammonia is steamed to mixed liquor heating, the ammonia steamed is fixed as the magnesium hydroxide that raw material forms high-purity with purification brine, it is lower to alleviate raw material precision used in manufacture magnesium hydroxide existing in the prior art, the technical problem for causing the precision for the magnesium hydroxide produced not high, it realizes and improves raw material precision, produce the technical effect of high purity magnesium hydrate.
Description
Technical field
The present invention relates to magnesium hydroxide manufacturing technology fields, more particularly, to a kind of production method of high purity magnesium hydroxide.
Background technique
Magnesium hydroxide is a kind of middle strong basicity white amorphous powder, is widely used in chemical industry, environmental protection, electronics, medicine
And the industries such as food, especially magnesium hydroxide can be used as the excellent fire retardant of plastics, rubber product and in environmental protection as cigarette
The neutralizer of road gas desulfurizer and acid-bearing wastewater, therefore as today's society economy is grown rapidly, country is to safe and environment-friendly work
Increasingly reinforcement, the demand of magnesium hydroxide constantly rises, and value is then also self-evident.Industrial production hydrogen-oxygen at present
Change magnesium includes following methods:
(1) brine pyrolysis-rehydration method
Dense brine is injected directly into reacting furnace to the thick oxygen for being pyrolyzed under 1100 DEG C of hot conditions, generating after pyrolysis
Change magnesium and contain the chlorides such as sodium chloride, potassium chloride and undecomposed magnesium chloride, can be removed with multistage washing, and keep thick magnesia complete
Portion's aquation forms magnesium hydroxide.The method hydrochloric acid that by-product concentration is about 20% or so simultaneously.Main chemical reactions formula:
MgCl2+H2O (vapour) MgO+2HCl (vapour)
MgO+H2O=Mg (OH) 2 ↓
(2) the newborn precipitation method of seawater-ash
First by limestone calcination at CaO, at directly generating Mg (OH) with magnesium chloride in seawater after grey cream after aquation
2.Technical process includes limestone calcination, the newborn preparation of ash, magnesium hydrate precipitate, separation of solid and liquid etc., main chemical reactions formula:
MgCl2+Ca (OH) 2=Mg (OH) 2 ↓+CaCl2
(3) brine-sodium hydroxide pellets method
This method is to react to generate magnesium hydrate precipitate with brine using sodium hydroxide.The advantages of this method is technique letter
List, product purity are higher.Key reaction formula are as follows:
MgCl2+2NaOH=Mg (OH) 2 ↓+2NaCl
But raw material precision used in traditional manufacture magnesium hydroxide is lower, leads to the essence of magnesium hydroxide produced
It spends not high.
Summary of the invention
The purpose of the present invention is to provide a kind of production methods of high purity magnesium hydroxide, are existed in the prior art with alleviating
Manufacture magnesium hydroxide used in raw material precision it is lower, the technical problem for causing the precision for the magnesium hydroxide produced not high.
The production method of high purity magnesium hydroxide provided by the invention, comprising the following steps:
Making from brine is standby: bischofite being put into halogen pond, after wash water dissolution, purification and impurity removal forms brine；
Solution filtering: adding water into brine, adjusts the content of magnesium ion in brine, and filters the suspended matter in brine, with
Form purification brine；
Preparation step: purification brine and ammonia are mixed, magnesium hydroxide solid and ammonium chloride solution are obtained；
Mixing step: ammonium chloride solution is mixed with lime, forms the mixed liquor of calcium chloride and ammonium hydroxide；
Heating stepses: the mixed liquor is heated and recycles ammonia.
Further, the preparation step is further comprising the steps of:
Successive reaction: brine and ammonia are added continuously in reaction kettle, so that chemical reaction life occurs for brine and ammonia
At magnesium hydroxide solid and ammonium chloride solution.
Further, the preparation step is further comprising the steps of:
Refrigerated separation: magnesium hydroxide solid and ammonium chloride solution are cooled, and will be separated by solid-liquid separation, to isolate chlorination
Ammonium salt solution.
Further, in the mixing step the following steps are included:
Heating ammonia still process: it will be heated in heat resolve section that ammonium chloride solution is put into destilling tower, so that in ammonium chloride solution
The ammonia of free state steams；
Hybrid reaction: being put into hybrid reaction in preliming tank for ammonium chloride solution and lime, forms calcium chloride and ammonium hydroxide mixing
Liquid.
Further, in the heating stepses the following steps are included:
Ammonia distillation: the mixed liquor of calcium chloride and ammonium hydroxide enters in the distilling period in destilling tower, using hot steam to mixed
Liquid heating is closed, the ammonium hydroxide in mixed liquor is formed into hot ammonia；
Ammonia is carried: hot ammonia and hot steam in distilling period enter in heat resolve section, in heat resolve section
Ammonium chloride heating.
Further, the production method of the high purity magnesium hydroxide is further comprising the steps of:
Heat exchange condensation: hot steam and hot ammonia in heat resolve section enter in condenser, by hot ammonia it is cooling into
Enter into reaction kettle.
Further, the mixing step is further comprising the steps of:
Lime production: by lime stone heating and calcining, lime is formed.
Further, the production method of the high purity magnesium hydroxide is further comprising the steps of:
Waste liquid discharge: the calcium chloride solution in preliming tank is discharged by the waste liquid outlet of preliming tank bottom.
Further, the production method of the high purity magnesium hydroxide is further comprising the steps of:
Solid wash water: the magnesium hydroxide solid after separation of solid and liquid is added into water washing, liquid and ammonium chloride solution after washing
It is entered in the heat resolve section of destilling tower together.
Further, the content of magnesium ion is 85~110g/L in the purification brine.
The production method of high purity magnesium hydroxide provided by the invention, comprising the following steps: making from brine is standby: bischofite is put
Enter into halogen pond, after wash water dissolution, purification and impurity removal forms brine；Solution filtering: adding water into brine, adjusts magnesium ion in brine
Content, and the suspended matter in brine is filtered, to form purification brine；Preparation step: purification brine and ammonia are mixed, obtained
Magnesium hydroxide solid and ammonium chloride solution；Mixing step: ammonium chloride solution is mixed with lime, forms the mixed of calcium chloride and ammonium hydroxide
Close liquid；Heating stepses: mixed liquor is heated and recycles ammonia.By forming brine to wash water purification and impurity removal, and brine is carried out
Filtering is adjusted, to form purification brine, after purification brine and ammonia hybrid reaction formed that magnesium hydroxide is fixed and ammonium chloride is molten
Liquid, after separation of solid and liquid, solution is mixed with lime, forms the mixed liquor of calcium chloride and ammonium hydroxide, and steam ammonia to mixed liquor heating,
The ammonia steamed is fixed as the magnesium hydroxide that raw material forms high-purity with purification brine, alleviates system existing in the prior art
The technical problem that raw material precision used in magnesium hydroxide is lower, causes the precision for the magnesium hydroxide produced not high is made, is realized
Raising raw material precision, produces the technical effect of high purity magnesium hydrate.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the process flow chart of the production method of high purity magnesium hydroxide provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the production method of high purity magnesium hydroxide provided in an embodiment of the present invention.
Icon: 100- destilling tower；110- heat resolve section；120- distilling period；200- preliming tank；300- reaction kettle；400-
Filter press；500- condenser.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, or be somebody's turn to do
Invention product using when the orientation or positional relationship usually put, be merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and cannot manage
Solution is indication or suggestion relative importance.
In addition, the terms such as term "horizontal", "vertical", " pendency " are not offered as requiring component abswolute level or pendency, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
With reference to the accompanying drawing, it elaborates to some embodiments of the present invention.In the absence of conflict, following
Feature in embodiment and embodiment can be combined with each other.
Fig. 1 is the process flow chart of the production method of high purity magnesium hydroxide provided in this embodiment；Fig. 2 mentions for the present embodiment
The structural schematic diagram of the production method of the high purity magnesium hydroxide of confession.
As shown in Figs. 1-2, the production method of high purity magnesium hydroxide provided in this embodiment, comprising the following steps: making from brine
It is standby: bischofite to be put into halogen pond, after wash water dissolution, purification and impurity removal forms brine；Solution filtering: adding water into brine,
The content of magnesium ion in brine is adjusted, and filters the suspended matter in brine, to form purification brine；Preparation step: halogen will be refined
Water and ammonia mixing, obtain magnesium hydroxide solid and ammonium chloride solution；Mixing step: ammonium chloride solution is mixed with lime, shape
At the mixed liquor of calcium chloride and ammonium hydroxide；Heating stepses: mixed liquor is heated and recycles ammonia.
Further, the content for refining magnesium ion in brine is 85~110g/L.
Specifically, the bischofite from salt lake is put into halogen pond, and after the dissolution of separation process wash water, purification and impurity removal,
Add water tune halogen after removal of impurities, so that Mg2+ content in brine is maintained at 85~110g/l or so, solution removes suspended matter through two step filters pressings
Obtain purification brine.
Purification brine and ammonium hydroxide are mixed, brine is refined and ammonium hydroxide chemically reacts, specific chemical equation are as follows:
MgCl2+2NH3+2H2O=Mg (OH)2+2NH4Cl produces magnesium hydroxide solid and ammonium chloride solution, after the reaction was completed by hydroxide
Magnesium solid and ammonium chloride liquid are separated by solid-liquid separation, and the ammonium chloride solution after separation of solid and liquid and lime mix generation chemistry instead
It answers, specific chemical equation are as follows: 2NH4Cl+CaO=CaCl2+H2O+2NH3, after the reaction was completed by the mixing of calcium chloride and ammonium hydroxide
Liquid heating, makes the ammonium hydroxide in mixed liquor be converted into ammonia, and ammonia is carried, and ammonia carries out anti-as raw material and purification brine
It answers, generates high purity magnesium hydrate solid.
The production method of high purity magnesium hydroxide provided in this embodiment, comprising the following steps: making from brine is standby: by bischofite
It is put into halogen pond, after wash water dissolution, purification and impurity removal forms brine；Solution filtering: into brine plus water, adjust in brine magnesium from
The content of son, and the suspended matter in brine is filtered, to form purification brine；Preparation step: purification brine and ammonia are mixed, obtained
To magnesium hydroxide solid and ammonium chloride solution；Mixing step: ammonium chloride solution is mixed with lime, forms calcium chloride and ammonium hydroxide
Mixed liquor；Heating stepses: mixed liquor is heated and recycles ammonia.By to wash water purification and impurity removal formed brine, and to brine into
Row filtering is adjusted, to form purification brine, after purification brine and ammonia hybrid reaction are formed magnesium hydroxide and fixed and ammonium chloride
Solution, after separation of solid and liquid, solution is mixed with lime, forms the mixed liquor of calcium chloride and ammonium hydroxide, and steam ammonia to mixed liquor heating
Gas, the ammonia steamed are fixed as the magnesium hydroxide that raw material forms high-purity with purification brine, alleviate and exist in the prior art
Manufacture magnesium hydroxide used in raw material precision it is lower, the technical problem for causing the precision for the magnesium hydroxide produced not high,
It realizes and improves raw material precision, produce the technical effect of high purity magnesium hydrate.
On the basis of the above embodiments, further, in the production method of high purity magnesium hydroxide provided in this embodiment
Preparation step it is further comprising the steps of: successive reaction: brine and ammonia are added continuously in reaction kettle 300, so that brine
Chemical reaction occurs with ammonia and generates magnesium hydroxide solid and ammonium chloride solution.
Further, preparation step is further comprising the steps of: refrigerated separation: magnesium hydroxide solid and ammonium chloride solution is cold
But cool down, and will be separated by solid-liquid separation, to isolate ammonium chloride solution.
Specifically, carrying out successive reaction, purification brine, ammonia are respectively with certain to refine brine and ammonia as raw material
Flow be added continuously to reaction kettle 300, and uninterrupted by controlling 300 collet cooling water of reaction kettle controls material
Temperature and pressure.After reacting in reaction kettle 300, reaction residual liquor carries out separating, washing, and supernatant enters after mother liquor storage tank
Into the heat resolve section 110 in destilling tower 100.
Further, the following steps are included: heating ammonia still process in mixing step: ammonium chloride solution is put into destilling tower 100
Heat resolve section 110 in heat so that the ammonia of free state steams in ammonium chloride solution；Hybrid reaction: by ammonium chloride solution and
Lime is put into hybrid reaction in preliming tank 200, forms calcium chloride and ammonia water mixture.
Specifically, the solution that brine and ammonium hydroxide generate after chemically reacting is mixed liquor, the main component in mixed liquor
For ammonium chloride, and it is mixed with partial ammonia water, the ammonium chloride mixed liquor after separation of solid and liquid enters the heat resolve section in destilling tower 100
In 110,110 pairs of ammonium chloride mixed liquors of heat resolve section are heated, and the ammonia of free state remaining in ammonium chloride mixed liquor is steamed
Out, the ammonia of free state in sodium chloride mixed liquor is made to be transformed into ammonia, ammonia is discharged by the gas outlet at 100 top of destilling tower, real
Now to the recycling of ammonia.
After ammonium chloride mixed solution heating ammonia still process in heat resolve section 110 in destilling tower 100, ammonium chloride solution enters
Into preliming tank 200, lime is put into preliming tank 200, lime and ammonium chloride solution chemically react, and generate calcium chloride
With the mixed liquor of ammonium hydroxide.
Further, the following steps are included: ammonia distills in heating stepses: the mixed liquor of calcium chloride and ammonium hydroxide enters steaming
It evaporates in the distilling period 120 in tower 100, mixed liquor is heated using hot steam, the ammonium hydroxide in mixed liquor is formed into hot ammonia；Ammonia
Air lift is slipped: hot ammonia and hot steam in distilling period 120 enter in heat resolve section 110, in heat resolve section 110
Ammonium chloride heating.
Specifically, the mixed liquor of calcium chloride and ammonium hydroxide in preliming tank 200 enters in the distilling period 120 of destilling tower 100,
It is heated using mixed liquor of the hot steam to calcium chloride and ammonium hydroxide, the ammonium hydroxide in mixed liquor is made to be transformed into ammonia, hot steam and ammonia
It is entered in the heat resolve section 110 of destilling tower 100 together, hot steam and ammonia are molten to the ammonium chloride in heat resolve section 110
Liquid is heated, and the ammonia of the free state in ammonium chloride solution is made to steam to form ammonia, and final ammonia and hot steam pass through destilling tower
The exhaust outlet discharge at 100 tops, realizes the recycling to ammonia.
In addition, hot steam and hot ammonia can be entered in heat resolve section 110 by pipeline in distilling period 120.
The production method of high purity magnesium hydroxide provided in this embodiment, by the way that lime and chlorination occur in preliming tank 200
The chemical reaction of ammonium, reaction generates the mixed liquor of calcium chloride and ammonium hydroxide, and heats to mixed liquor ammonium hydroxide being transformed into ammonia, to ammonia
Gas is recycled.
On the basis of the above embodiments, further, the production method of high purity magnesium hydroxide provided in this embodiment is also
The following steps are included: heat exchange condensation: hot steam and hot ammonia in heat resolve section 110 enter in condenser 500, will be hot
Ammonia cooling enters in reaction kettle 300.
Specifically, hot steam and hot ammonia in heat resolve section 110 by the exhaust outlet at 100 top of destilling tower be discharged into
Enter into condenser 500, condenser 500 makes hot steam be condensed into liquid, ammonia passes through hot steam and the cooling condensation of hot ammonia
Condenser 500 re-enters into reaction kettle 300, realizes the recycling of ammonia, and the raw material for producing magnesium hydroxide is continuous
Recycling makes integrated artistic have continuity.
Further, mixing step is further comprising the steps of: lime production: by lime stone heating and calcining, forming lime.
Specifically, lime is formed by lime stone heating and calcining, raw material limestone enters measuring tank, and control metering enters stone
Ash furnace calcining, generates lime and kiln gas, lime draw off limekiln from kiln bottom deslagging, is sent to lime silo, and kiln gas is pushed up from limekiln
Portion's discharge system.
Further, the production method of high purity magnesium hydroxide is further comprising the steps of: waste liquid discharge: in preliming tank 200
Calcium chloride solution is discharged by the waste liquid outlet of 200 bottom of preliming tank.
Specifically, the calcium chloride solution in distilling period 120 in destilling tower 100 enters in preliming tank 200, preliming tank
Calcium chloride solution in 200 is discharged by waste liquid outlet.
In addition, moisture in calcium chloride solution can come back to steaming being volatilized into hot steam, hot steam in preliming tank 200
It evaporates and is used in section 120, other purposes can also be done.
Further, the production method of high purity magnesium hydroxide is further comprising the steps of: solid wash water: after separation of solid and liquid
Magnesium hydroxide solid adds water washing, and the liquid after washing enters the heat resolve section of destilling tower 100 together with ammonium chloride solution
In 110.
Specifically, magnesium hydroxide solid, after separation of solid and liquid, magnesium hydroxide slurry tentatively divides through vertical plate and frame filter press 400
From addition water and magnesium hydroxide solid mixing, washing, the ammonium chloride solution for adhering to magnesium hydroxide mix ammonium chloride is molten with water
Liquid is separated with magnesium hydroxide, and the wash water after washing enters in the heat resolve section 110 in destilling tower 100.
The production method of high purity magnesium hydroxide provided in this embodiment, by by magnesium hydroxide carrying out washing treatment, after washing
Solution contains ammonium chloride solution, enters in the heat resolve section 110 of destilling tower 100, avoids the waste of ammonium chloride solution.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of production method of high purity magnesium hydroxide, which comprises the following steps:
Making from brine is standby: bischofite being put into halogen pond, after wash water dissolution, purification and impurity removal forms brine；
Solution filtering: adding water into brine, adjusts the content of magnesium ion in brine, and filters the suspended matter in brine, to be formed
Refine brine；
Preparation step: purification brine and ammonia are mixed, magnesium hydroxide solid and ammonium chloride solution are obtained；
Mixing step: ammonium chloride solution is mixed with lime, forms the mixed liquor of calcium chloride and ammonium hydroxide；
Heating stepses: the mixed liquor is heated and recycles ammonia.
2. the production method of high purity magnesium hydroxide according to claim 1, which is characterized in that the preparation step further includes
Following steps:
Successive reaction: brine and ammonia are added continuously in reaction kettle, so that chemical reaction, which occurs, for brine and ammonia generates hydrogen
Magnesia solid and ammonium chloride solution.
3. the production method of high purity magnesium hydroxide according to claim 2, which is characterized in that the preparation step further includes
Following steps:
Refrigerated separation: magnesium hydroxide solid and ammonium chloride solution are cooled, and will be separated by solid-liquid separation, molten to isolate ammonium chloride
Liquid.
4. the production method of high purity magnesium hydroxide according to claim 3, which is characterized in that include in the mixing step
Following steps:
Heating ammonia still process: will heat in heat resolve section that ammonium chloride solution is put into destilling tower, so as to dissociate in ammonium chloride solution
The ammonia of state steams；
Hybrid reaction: ammonium chloride solution and lime are put into hybrid reaction in preliming tank, form calcium chloride and ammonia water mixture.
5. the production method of high purity magnesium hydroxide according to claim 4, which is characterized in that include in the heating stepses
Following steps:
Ammonia distillation: the mixed liquor of calcium chloride and ammonium hydroxide enters in the distilling period in destilling tower, using hot steam to mixed liquor
Heating, forms hot ammonia for the ammonium hydroxide in mixed liquor；
Ammonia is carried: hot ammonia and hot steam in distilling period enter in heat resolve section, to the chlorine in heat resolve section
Change ammonium heating.
6. the production method of high purity magnesium hydroxide according to claim 5, which is characterized in that the high purity magnesium hydroxide
Production method is further comprising the steps of:
Heat exchange condensation: hot steam and hot ammonia in heat resolve section enter in condenser, and the cooling of hot ammonia is entered
In reaction kettle.
7. the production method of high purity magnesium hydroxide according to claim 6, which is characterized in that the mixing step further includes
Following steps:
Lime production: by lime stone heating and calcining, lime is formed.
8. the production method of high purity magnesium hydroxide according to claim 7, which is characterized in that the high purity magnesium hydroxide
Production method is further comprising the steps of:
Waste liquid discharge: the calcium chloride solution in preliming tank is discharged by the waste liquid outlet of preliming tank bottom.
9. the production method of high purity magnesium hydroxide according to claim 3, which is characterized in that the high purity magnesium hydroxide
Production method is further comprising the steps of:
Solid wash water: the magnesium hydroxide solid after separation of solid and liquid is added into water washing, the liquid after washing is together with ammonium chloride solution
It enters in the heat resolve section of destilling tower.
10. the production method of high purity magnesium hydroxide according to claim 1, which is characterized in that magnesium in the purification brine
The content of ion is 85~110g/L.
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| GB939467A (en) * | 1960-10-12 | 1963-10-16 | Negev Phosphates Ltd | Production of magnesium hydroxide |
| JP2000093739A (en) * | 1998-09-22 | 2000-04-04 | Techno Toriito:Kk | Treatment of magnesium sulfate-containing wastewater |
| CN1252295C (en) * | 2003-11-20 | 2006-04-19 | 中南大学 | Method for preparing high-purity magnesite by taking bischofite in salt lake as raw material |
| CN103011209A (en) * | 2011-09-23 | 2013-04-03 | 但建明 | Ammonium chloride circulation method for producing magnesium hydroxide and calcium chloride from carbide slag and salt lake magnesium chloride |
| CA2939418A1 (en) * | 2014-04-10 | 2015-10-15 | Karnalyte Resources Inc. | Process for producing high grade hydromagnesite and magnesium oxide |
| CN105417823A (en) * | 2015-12-25 | 2016-03-23 | 周振喜 | Method of recycling ammonia from low-concentration ammonium chloride waste water |
| CN105480991A (en) * | 2016-01-21 | 2016-04-13 | 青海盐湖工业股份有限公司 | Preparation method and device of magnesium hydroxide |
| CN109928408A (en) * | 2019-04-16 | 2019-06-25 | 中国天辰工程有限公司 | The method and system of ammonia is recycled from potassium nitrate process by-product ammonium chloride |
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2019
- 2019-07-02 CN CN201910592102.XA patent/CN110240185A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB939467A (en) * | 1960-10-12 | 1963-10-16 | Negev Phosphates Ltd | Production of magnesium hydroxide |
| US3170762A (en) * | 1960-10-12 | 1965-02-23 | Negev Phosphates Ltd | Manufacture of magnesium hydroxide |
| JP2000093739A (en) * | 1998-09-22 | 2000-04-04 | Techno Toriito:Kk | Treatment of magnesium sulfate-containing wastewater |
| CN1252295C (en) * | 2003-11-20 | 2006-04-19 | 中南大学 | Method for preparing high-purity magnesite by taking bischofite in salt lake as raw material |
| CN103011209A (en) * | 2011-09-23 | 2013-04-03 | 但建明 | Ammonium chloride circulation method for producing magnesium hydroxide and calcium chloride from carbide slag and salt lake magnesium chloride |
| CA2939418A1 (en) * | 2014-04-10 | 2015-10-15 | Karnalyte Resources Inc. | Process for producing high grade hydromagnesite and magnesium oxide |
| CN105417823A (en) * | 2015-12-25 | 2016-03-23 | 周振喜 | Method of recycling ammonia from low-concentration ammonium chloride waste water |
| CN105480991A (en) * | 2016-01-21 | 2016-04-13 | 青海盐湖工业股份有限公司 | Preparation method and device of magnesium hydroxide |
| CN109928408A (en) * | 2019-04-16 | 2019-06-25 | 中国天辰工程有限公司 | The method and system of ammonia is recycled from potassium nitrate process by-product ammonium chloride |
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