CN104261442A - Method for preparing magnesium hydroxide - Google Patents
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- CN104261442A CN104261442A CN201410322520.4A CN201410322520A CN104261442A CN 104261442 A CN104261442 A CN 104261442A CN 201410322520 A CN201410322520 A CN 201410322520A CN 104261442 A CN104261442 A CN 104261442A
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- magnesium hydroxide
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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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Abstract
The invention discloses a method for preparing magnesium hydroxide. The method comprises the steps of (1) adding liquid ammonia into a reaction solution containing magnesium chloride, reacting in an open system and obtaining a reaction mother solution containing magnesium hydroxide precipitate after the reaction; (2) filtering the reaction mother solution to obtain magnesium hydroxide solid and a primary mother solution. The prepared magnesium hydroxide has high content and uniform granularity, and can be filtered and washed easily. In a production process, the utilization rate of magnesium hydroxide and liquid ammonia is high; none of three wastes is discharged; processing amount is small; and the method belongs to a clean, environment-friendly and green chemical production method.
Description
Technical field
The invention belongs to Salt Lake Chemistry field, be specifically related to a kind of method being prepared magnesium hydroxide by solid potassium salt ore deposit.
Background technology
Magnesium hydroxide is colourless hexagonal prism crystal or white powder, is insoluble in water and alcohol, is dissolved in diluted acid and ammonium salt solution, and the aqueous solution is in alkalescence, and its solubleness in water is very little, and when 18 DEG C, solubleness is 0.0009g/100g but it is strong electrolyte.
Magnesium hydroxide is widely used as the flame retardant filler of the materials such as plastics, resin, rubber, paint.Magnesium hydroxide has the mechanism of flame-retardant nature to be: magnesium hydroxide just decomposes more than 340 DEG C, generates magnesium oxide and water, absorbs the heat on combustionmaterial surface; The large quantity of moisture generated has the effect of dilution and isolated combustionmaterial superficial air (oxygen), and decomposing the activated magnesia solid generated is then high temperature resistant material, is attached to combustiblematerials surface and stops burning to be carried out further.Magnesium hydroxide does not produce corrodibility and toxic gas when decomposing, and it is in alkalescence, the sour gas discharged when can absorb and neutralize burning is as carbonic acid gas, sulfurous gas and oxynitride, decompose the obnoxious flavour, smog and the imperfect combustion fusing residue that produce when the activated magnesia generated also can absorb burning, eliminate smog, the production process of molten drop is stopped, thus reaches fire-retardant object.Therefore all it is called in the industry the environmental friendliness fire retardant of green safety.
Magnesium hydroxide is the main magnesium compound product of magnesium ore resources deep processing.Global magnesium hydroxide consumption about 1,400,000 tons in 2009, wherein maximum consumer applications is wastewater treatment and flue gas desulfurization, accounts for 58%, is secondly engineering materials fire retardant, accounts for 15%.Fire retardant uses the fastest-rising field of magnesium hydroxide.To 2015, the expection of magnesium hydroxide aggregate consumption reached about 1,500,000 tons.The application of China's magnesium hydroxide is in the starting stage.Within 2009, Chinese magnesium hydroxide market capacity rises to about 250,000 tons, and wherein 90% for field of Environment Protection, and 4% for fire retardant, and 3% for food and medicine product market.
Current magnesium hydroxide is mainly through following two kinds of approach preparation: one is utilize natural brucite resource, through refining preparing magnesium hydroxide; Two is obtained by chemical synthesis by containing magnesium raw material, and conventional contains magnesium raw material mainly magnesia, seawater, bittern, bromine extraction waste brine and magnesium sulfate etc.
The main component of natural mineral brucite is magnesium hydroxide, is a kind of oxyhydroxide of laminate structure, and belong to trigonal system, common being configured with is block, spherical and fibrous, is that nature finds a kind of mineral that magnesium content is the highest so far.Magnesium hydroxide brucite powder (pulverizing 100 orders) is prepared by brucite, then by powder comminution by gas stream to 500 order to 1200 order, powder surface promoting agent modified magnesium hydroxide.This magnesium hydroxide manufacturing process is simple, and cost is lower, but brucite mineral wealth are limited, and its large-scale production magnesium hydroxide is restricted.
Chemical synthesis is divided into again two kinds, and one is obtained by light magnesium oxide hydration; Another kind precipitates obtained, and it is as follows that it mainly prepares production method:
(1) calcium hydroxide method
Calcium hydroxide method is also called milk of lime process, is a kind of traditional preparation method.With Ca (OH)
2for precipitation agent, reaction formula is:
Mg
2++Ca(OH)
2→Mg(OH)
2↓+Ca
2+
The advantage of this method is that raw material is easy to get, and production technique is simple.But because the poly-attached tendency of product granularity little (generally below 0.51 μm) is large, be difficult to sedimentation, filtration and washing, and easily adsorbing contaminant, product purity is low, to be mainly used in the less demanding flue gas desulfurization of product purity and acid waste water and etc., by-product calcium chloride must recycle simultaneously.
(2) ammonia precipitation
Ammonia precipitation is a kind of important method of producing magnesium hydroxide, and take ammonia as precipitation agent, reaction formula is:
Mg
2++2NH
3·H
2O→Mg(OH)
2↓+2NH
4 +
The weak NH of alkalescence due to ammoniacal liquor
4 +mg (OH) can be made
2solubleness strengthen, thus reaction process is easy to control, and obtains the magnesium hydroxide products that high-purity fine and large grain size easily wash, be applicable to the industry that medicine, chemical reagent and electronic-grade magnesium hydroxide etc. are high to purity requirement by technique adjustment.This method is the method that domestic production magnesium hydroxide generally adopts, and the preparation technology improved in recent years mainly contains single stage method and continuous precipitation two kinds.
Single stage method is completed precipitin reaction, hydrothermal treatment consists, surface treatment one step, and shorten technical process, facility investment is few, and cost is low, the performance of product also comparatively traditional method improve a lot.This method is applicable to magnesium ion concentration higher raw brine, the particularly Mg content bittern about 30 grams per liters.
Continuous precipitation is the improvement to traditional bittern-ammonia precipitation preparing magnesium hydroxide method.The charging magnesium ion concentration of this technique is higher, keeps relatively low degree of supersaturation simultaneously, has quantitative magnesium hydroxide to exist in system all the time, and can regulate the residence time of material in reactor.This method continuous prodution, raw material availability is high, and the reaction times is short, and facility investment is few, and product stability is good.
(3) magnesium oxide aquation method
This method is the magnesium hydroxide products in order to obtain high-purity or special physical and chemical performance, and the raw materials of magnesium oxide of requirement must be high purity light activated magnesia, otherwise not easily realizes.
(4) aquation method is calcined
Namely simple magnesium chloride dinectly bruning is first utilized, and then aquation preparation.This method technique is simple, and without the need to other subsidiary material, raw material availability is high, but the utilization of by-product hydrochloric acid is the major obstacle of its technology popularization of restriction.
The magnesium hydroxide that normal temperature synthesis method is produced is coventional type magnesium hydroxide, it has that specific surface area is large, the easy feature such as reunion between particle, under microscope, magnesium hydroxide is the subsphaeroidal or irregular particle that sheet is reunited, median size is at about 3-15 μm, because its consistency and dispersiveness are poor all especially, this magnesium hydroxide is not adapted at doing fire retardant in plastics and rubber and uses.
Flame Retardant Magnesium Hydroxide must manage to eliminate surface polarity as far as possible, namely reaches the performance of large crystal formation, low surface area and low microcosmic internal stress, makes it mixing with organic materials better.Magnesium hydroxide is the same with other inorganic combustion inhibitors, because there is wetting ability with electric charge, when it adds man-hour with macromolecular material is blended, poor with surface oil loving macromolecular material avidity, cause dispersed bad, therefore must manage the surface properties changing magnesium hydroxide, namely need to carry out modification to magnesium hydroxide.
In order to prepare the good magnesium hydroxide of flame retardant properties, generally need to adopt special synthesis technique, and hydrothermal treatment consists is carried out to the magnesium hydroxide of normal temperature synthesis, impel and generate little, the good magnesium hydroxide of crystal formation of specific surface area, and then carry out surface treatment, improve the consistency of it and macromolecular material.Therefore, preparation Flame Retardant Magnesium Hydroxide needs three phases usually: normal temperature synthesis (lower than 100 DEG C), hydrothermal treatment consists (100-300 DEG C), surface modification.
Surface-modifying agent divides from structure and characteristics, can be divided into tensio-active agent, coupling agent, organic polymer and inorganics.For brucite and magnesium hydrate powder surface modification, mainly tensio-active agent, coupling agent etc.Tensio-active agent refers to the material using this material of minute quantity significantly can change material surface or interfacial property.Its molecular structure feature comprises hydrophobic group (longer nonpolar group) and hydrophilic group (shorter polar group).Comprise anionic, cationic and non-ionic type, as higher fatty acid and salt, alcohols, amine and ester class etc.One end of its molecule is chain alkyl, and structure is close with polymer molecule; The other end is carboxyl, ether, amino isopolarity group, can with inorganic filler particle generation physical adsorption or chemical reaction, thus cover particle surface.Because magnesium hydroxide and brucite powder surface are with positive charge, and iso-electric point is higher, mainly uses anion surfactant to their surface modification.
Current domestic use more surface-modifying agent is sodium stearate or sodium oleate, also can use other anion surfactants, as alkylsurfuric acid salt and sulfonation succinate salt, in addition, titanic acid ester, silicane tensio-active agent are also suitable for.Fill linear low-density polyethylene material, its exotherm rate with vinyl three oxosilane and butyl tin dilaurate surface-treated magnesium hydroxide, the generation of cigarette all decreases, limited oxygen index, and ignition time, combustion residue all improves.
At present, for the preparation of magnesium hydroxide, published newer method comprises:
Chinese patent application 02131340.7 describes and utilizes magnesium salts to synthesize to obtain magnesium hydroxide intermediate and then carry out the method that Hydrothermal Synthesis obtains high dispersion flake magnesium hydroxide, but to there is technique longer for the method, and equipment is difficult to industrialized defect;
Chinese patent application 02155486.2 describes the production technique that a kind of salt lake brine produces magnesium hydroxide, bariumchloride and hydrogen sulfide: salt lake brine and barium hydrosulfide carry out reacting by heating, produces hydrogen sulfide and is precipitated; After reaction terminates, filter, with deionized water washing sediment, obtain magnesium hydroxide products.This invention utilizes salt lake brine and barium hydrosulfide to be raw material, achieves the production technique of coproduction magnesium hydroxide, bariumchloride and hydrogen sulfide;
Chinese patent application 200610041984.3 discloses the method for magnesium hydroxide modification.Ordinary hydrogen magnesium oxide is under the effect of special appearance control agent and transforming agent, and hydrothermal treatment consists at 140 ~ 200 DEG C, is finally converted into hexagonal plate magnesium hydroxide;
Chinese patent application 200610043680.0 discloses the method utilizing the magnesium hydrate powder of wet grinding magnesium hydroxide preparation particle diameter between 1 ~ 2.7 μm, the method is by adding grinding distribution agent, make the particle grinding the magnesium hydrate powder obtained less, and particle is mellow and full, be beneficial to the coated of later stage and modification;
Chinese patent application 01127343.7 discloses the method utilizing and adopt One-step production magnesium hydroxide containing magnesium chloride and ammoniacal liquor, by controlling the mol ratio of ammonia magnesium between 1.3 ~ 2.0,5 ~ 30min is reacted at 45 ~ 90 DEG C, then filtration washing drying and crushing, obtain magnesium hydroxide, quality product is high and stable;
Chinese patent application ZL02160146.1 discloses and adopts sodium hydroxide and ammoniacal liquor to be mixed precipitant, and prepare nanometric magnesium hydroxide by the reverse precipitator method, the particle diameter of the nanometric magnesium hydroxide prepared is generally between 30 ~ 100nm;
It is that raw material China transforms the preparation method producing high purity nano-magnesium hydroxide with ammonium carnallite that Chinese patent application 200410052664.9 discloses a kind of liquid phase alkaline hydrolysis that utilizes;
Chinese patent application 200510086473.9 discloses a kind of liquefied ammonia pressurized precipitation-hydrothermal modification legal system that utilizes for the method for flame retardant of magnesium hydroxide.First the method prepares magnesium hydrate precipitate, and then utilizes the method for hydrothermal modification, prepare the flame retardant of magnesium hydroxide of particle diameter between 1.0 ~ 4.0 μm, but its purity is lower, is about 98%;
Chinese patent application 200610042411.2 discloses a kind of preparation method utilizing the method for light calcined magnesia aquation to produce magnesium hydroxide for fire retardant.In hydration process, add sodium hydroxide solution, then utilize hydro-thermal reaction, at 140 ~ 180 DEG C, react 4 ~ 6h, obtain target product;
Chinese patent application 200710119606.7 discloses one and utilizes Microwave synthesize method for synthesizing flame retardant of magnesium hydroxide, and the method is with magnesium sulfate, sodium hydroxide for raw material, and to add sulfonation pentanedioic acid fat be properties-correcting agent.The particle diameter of the magnesium hydroxide particle obtained is between 0.1 ~ 3 μm.It take atomized ammonia as the method that high purity magnesium hydroxide prepared by precipitation agent that Chinese patent application 200810010334.1 discloses a kind of.Employing atomized ammonia is precipitation agent, and magnesium chloride solution is that raw material carries out reaction and prepares magnesium hydroxide.Add crystal seed, the particle diameter of the magnesium hydroxide obtained is between 10 ~ 100 μm, and purity is between 98 ~ 99.999%.
Not having in above-mentioned patent application to carry out magnesium hydroxide production for carrying the old halogen of potassium or waste liquid specially, the problem using and put forward and running into when the old halogen of potassium or waste liquid produce magnesium hydroxide cannot be solved.
Summary of the invention
The object of the invention is to overcome in prior art and prepare the higher defect of flame retardant resistance magnesium oxide complex process cost, a kind of method utilizing liquid ammonia process for caustic soda purification to produce fire-retardant magnesium hydroxide is provided.
The method utilizing liquid ammonia process for caustic soda purification to produce fire-retardant magnesium hydroxide provided by the invention comprises:
1) add liquefied ammonia to containing in the reaction solution of magnesium chloride, react in open system, after reaction, obtain the reaction mother liquor containing magnesium hydrate precipitate;
2) reaction mother liquor obtains magnesium hydroxide solid and a mother liquor after filtration.
Preferably, in described reaction solution, the mass concentration of magnesium chloride is 10 ~ 25%.Described reaction solution can by putting forward potassium mother liquor, described in put forward the mass concentration of potassium mother liquor magnesium chloride between 25% ~ saturation concentration.
Preferably, step 1) in temperature of reaction be 30 ~ 90 DEG C.
Preferred, described temperature of reaction is 20 ~ 60 DEG C.
When temperature of reaction is lower, speed of response is comparatively slow, and the viscosity increase of solution can cause the reduction of reaction efficiency, thus the strainability that result in magnesium hydroxide is deteriorated.And when the temperature that selection one is higher, the volatilization of dissolved ammonia in system can be brought again, degradation manipulation environment and bring the waste of material, when the temperature range reaction of selective temperature at about 25 ~ 50 DEG C, the strainability of reaction product is better, and avoids the waste of material.
Preferably, described step 1) in reaction time reaction solution pH be 8 ~ 11.When pH is lower, affects and dissolve in the impact of ammonium chloride due to magnesium hydroxide by its solubility product, it is difficult to form magnesium hydrate precipitate.And when system select one stronger alkaline time, then can cause the quick generation of magnesium hydrate precipitate, the crystal formation of product intersects, filtration difficulty, and is difficult to washing, purity drop.Preferred, the pH keeping reaction solution during described reaction is 9 ~ 10.
Preferably, the described reaction times is 40 ~ 360min.The rational reaction times is selected can farthest to promote the generation of magnesium hydroxide and the raising of the production cost avoiding the long reaction times to bring.
Preferably, the ratio of described liquefied ammonia and magnesium chloride is 1 ~ 2.0.Higher ammonia magnesium, than the supersaturation that directly can bring system, forms the magnesium hydroxide of fine particle, thus it is serious to cause magnesium hydroxide to be reunited, and is difficult to filter.
Preferably, described method also comprises step 3):
In a mother liquor through decompression ammonia still process obtain ammonia and secondary mother liquid, described ammonia through carry potassium mother liquor absorption cycle utilize.
Preferred, described method also comprises step 4)
Secondary mother liquid obtains ammonium chloride and three mother liquors through concentrated, and described ammonium chloride may be used for preparing ammonium chloride product, and described three mother liquors return step 1) be used as the reaction solution of configuration containing magnesium chloride.
Preferred, step 1) in reaction solution by three mother liquors with carry potassium mother liquor and mix, described in carry potassium mother liquor, three mother liquors and water ratio be 1:0.6 ~ 1.4:0.5 ~ 1.
Old halogen after potassium is carried in present method comprehensive utilization, utilizes liquid and waste slag produced for raw material, improves economic benefit, to the green close friend of environment and production process three-waste free discharge, cleaner production.Meanwhile, the magnesium hydroxide purity of production is high, be easy to filtration washing, and the ammonium chloride of by-product had both met the specification of quality of industrial ammonium chloride, can use again as the agricultural fertilizer material of high-quality.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is the Laser particle-size distribution figure of the product that method of the present invention obtains.As seen from the figure, the magnesium hydroxide median particle diameter that obtains of embodiment 1 ~ 3 is between 20 ~ 40 μm.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further.
Embodiment one
See Fig. 1, according to certain ratio, the old halogen of potassium, mother liquid evaporation and water are carried in mixing, the concentration of magnesium chloride is made to reach 15% (w/w), join in the stirred autoclave of 2L according to the input speed of 0.8L/h, liquefied ammonia passes into bottom reactor according to the speed of 1.4mol/h, and stirring intensity is 650rpm, react under the condition of 40 DEG C, obtain the reaction mother liquor containing magnesium hydrate precipitate by overflow.
Filter above-mentioned reaction mother liquor and obtain magnesium hydroxide solid and a mother liquor, the magnesium hydrate precipitate obtained is after washing, drying, and obtain magnesium hydroxide products, its purity is 99.8%, and median particle diameter D50 is 35.1 μm.
One time mother liquor obtains secondary mother liquid after decompression ammonia still process, and the ammonia obtained returns reactions steps recycle after utilizing and proposing the absorption of potassium mother liquor.
Secondary mother liquid obtains three mother liquors after continuing evaporation concentration, and containing the magnesium chloride of 12% in three mother liquors, it can return reactions steps recycle; Obtain solid ammonium chloride in addition, ammonium chloride, after washing drying, meets GB2946-92 technical grade and agricultural grade ammonium chloride product standard simultaneously.
Embodiment two
According to certain ratio, the old halogen of potassium, mother liquid evaporation and water are carried in mixing, the concentration of magnesium chloride is made to reach 20% (w/w), join in the stirred autoclave of 5L according to the input speed of 5.0L/h, liquefied ammonia passes into bottom reactor according to the speed of 18mol/h, stirring intensity is 600rpm, reacts, obtain the reaction mother liquor containing magnesium hydrate precipitate by overflow under the condition of 60 DEG C.
Filter above-mentioned reaction mother liquor and obtain magnesium hydroxide solid and a mother liquor, the magnesium hydrate precipitate obtained is after washing, drying, and obtain magnesium hydroxide products, its purity is 99.6%, and median particle diameter D50 is 29.3 μm.
One time mother liquor obtains secondary mother liquid after decompression ammonia still process, and the ammonia obtained returns reactions steps recycle after utilizing and proposing the absorption of potassium mother liquor.
Secondary mother liquid continues to obtain three mother liquors after evaporation concentration, and three mother liquors contain the magnesium chloride of 14%; The solid ammonium chloride simultaneously also obtained, after washing drying, meets GB2946-92 technical grade and agricultural grade ammonium chloride product standard.Three times mother liquor returns reactions steps recycle.
Embodiment three
According to certain ratio, the old halogen of potassium, mother liquid evaporation and water are carried in mixing, the concentration of magnesium chloride is made to reach 25% (w/w), join in the stirred autoclave of 10L according to the input speed of 15L/h, liquefied ammonia passes into bottom reactor according to the speed of 95mol/h, stirring intensity is 244rpm, reacts, obtain the reaction mother liquor containing magnesium hydrate precipitate by overflow under the condition of 90 DEG C.
Filter above-mentioned reaction mother liquor and obtain magnesium hydroxide and a mother liquor, the magnesium hydrate precipitate obtained is after washing, drying, and obtain magnesium hydroxide products, its purity is 99.2%, and median particle diameter D50 is 23.5 μm.
One time mother liquor obtains secondary mother liquid after decompression ammonia still process, and the ammonia obtained returns reactions steps recycle after utilizing and proposing the absorption of potassium mother liquor.
Secondary mother liquid obtains three mother liquors after continuing evaporation concentration, containing the magnesium chloride of 14% in three mother liquors; Obtain solid ammonium chloride, ammonium chloride, after washing drying, meets GB2946-92 technical grade and agricultural grade ammonium chloride product standard simultaneously.Three times mother liquor returns reactions steps recycle.
Claims (10)
1. prepare a method for magnesium hydroxide, comprising:
1) add liquefied ammonia to containing in the reaction solution of magnesium chloride, react in open system, after reaction, obtain the reaction mother liquor containing magnesium hydrate precipitate;
2) reaction mother liquor obtains magnesium hydroxide solid and a mother liquor after filtration.
2. method according to claim 1, is characterized in that, in described reaction solution, the mass concentration of magnesium chloride is 10 ~ 25%.
3. method according to claim 1, is characterized in that, described step 1) in temperature of reaction be 30 ~ 90 DEG C.
4. method according to claim 3, is characterized in that, described temperature of reaction is 20 ~ 60 DEG C.
5. method according to claim 1, is characterized in that, described step 1) in reaction time reaction solution pH be 8 ~ 11.
6. method according to claim 1, is characterized in that, step 1) reaction times is 40 ~ 360min.
7. method according to claim 1, is characterized in that, the ratio of described liquefied ammonia and magnesium chloride is 1 ~ 2.0.
8. method according to claim 1, is characterized in that, described method also comprises step 3):
In a mother liquor through decompression ammonia still process obtain ammonia and secondary mother liquid, described ammonia through carry potassium mother liquor absorption cycle utilize.
9. method according to claim 8, is characterized in that, described method also comprises step 4)
Secondary mother liquid obtains ammonium chloride and three mother liquors through concentrated, and described three mother liquors return step 1) be used as the reaction solution of configuration containing magnesium chloride.
10. method according to claim 9, is characterized in that, step 1) in reaction solution by three mother liquors with carry potassium mother liquor and mix, described in carry potassium mother liquor, three mother liquors and water ratio be 1:0.6 ~ 1.4:0.5 ~ 1.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105294704A (en) * | 2015-11-24 | 2016-02-03 | 青海盐湖工业股份有限公司 | Reutilization method of by-product ammonium chloride from ammonia process to produce magnesium hydroxide |
| 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 |
| CN110203951A (en) * | 2019-06-26 | 2019-09-06 | 青海盐湖工业股份有限公司 | A kind of preparation method of magnesium hydroxide with coproduction dichloride hexamine nickel |
| CN113307290A (en) * | 2021-05-20 | 2021-08-27 | 青海盐湖工业股份有限公司 | Agglomerated large-particle-size magnesium hydroxide and preparation method thereof |
| CN114956133A (en) * | 2022-05-27 | 2022-08-30 | 华东理工大学 | Method for preparing magnesium hydroxide by extracting potassium, old bittern, magnesium chloride and ammonia gas |
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| CN102674409A (en) * | 2012-05-31 | 2012-09-19 | 中南大学 | Method for preparing rod-like magnesium hydroxide from salt lake brine |
| 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 |
| CN103880698A (en) * | 2014-03-14 | 2014-06-25 | 浙江迪邦化工有限公司 | Clean production method of dye intermediate |
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| SU1430348A1 (en) * | 1986-06-30 | 1988-10-15 | Институт химии АН ТССР | Method of producing magnesium hydroxide |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105294704A (en) * | 2015-11-24 | 2016-02-03 | 青海盐湖工业股份有限公司 | Reutilization method of by-product ammonium chloride from ammonia process to produce magnesium hydroxide |
| 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 |
| CN110203951A (en) * | 2019-06-26 | 2019-09-06 | 青海盐湖工业股份有限公司 | A kind of preparation method of magnesium hydroxide with coproduction dichloride hexamine nickel |
| CN110203951B (en) * | 2019-06-26 | 2021-08-31 | 青海盐湖工业股份有限公司 | Preparation method for magnesium hydroxide and coproduction of nickel hexammine dichloride |
| CN113307290A (en) * | 2021-05-20 | 2021-08-27 | 青海盐湖工业股份有限公司 | Agglomerated large-particle-size magnesium hydroxide and preparation method thereof |
| CN114956133A (en) * | 2022-05-27 | 2022-08-30 | 华东理工大学 | Method for preparing magnesium hydroxide by extracting potassium, old bittern, magnesium chloride and ammonia gas |
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