CN106044806B - Method for preparing magnesium hydrate by using magnesite - Google Patents
Method for preparing magnesium hydrate by using magnesite Download PDFInfo
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- CN106044806B CN106044806B CN201610393799.4A CN201610393799A CN106044806B CN 106044806 B CN106044806 B CN 106044806B CN 201610393799 A CN201610393799 A CN 201610393799A CN 106044806 B CN106044806 B CN 106044806B
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- magnesite
- mineral aggregate
- rotary kiln
- magnesium
- magnesium hydroxide
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- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title claims abstract description 58
- 239000001095 magnesium carbonate Substances 0.000 title claims abstract description 58
- 229910000021 magnesium carbonate Inorganic materials 0.000 title claims abstract description 58
- 235000014380 magnesium carbonate Nutrition 0.000 title claims abstract description 57
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 50
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 34
- 238000001354 calcination Methods 0.000 claims abstract description 31
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 26
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229910001626 barium chloride Inorganic materials 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000012153 distilled water Substances 0.000 claims abstract description 12
- 239000002817 coal dust Substances 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract 8
- 239000000347 magnesium hydroxide Substances 0.000 claims description 43
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 43
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 36
- 235000010755 mineral Nutrition 0.000 claims description 36
- 239000011707 mineral Substances 0.000 claims description 36
- 235000012245 magnesium oxide Nutrition 0.000 claims description 30
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 206010013786 Dry skin Diseases 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 238000003756 stirring Methods 0.000 abstract description 2
- 239000011362 coarse particle Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 22
- 239000003063 flame retardant Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 14
- 230000008569 process Effects 0.000 description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 11
- 229910052749 magnesium Inorganic materials 0.000 description 10
- 239000011777 magnesium Substances 0.000 description 10
- 235000011132 calcium sulphate Nutrition 0.000 description 9
- 230000008859 change Effects 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000012535 impurity Substances 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 241000209051 Saccharum Species 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 159000000003 magnesium salts Chemical class 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000001175 calcium sulphate Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003837 high-temperature calcination Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229920006305 unsaturated polyester Polymers 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010010904 Convulsion Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- 230000001458 anti-acid effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910001748 carbonate mineral Inorganic materials 0.000 description 1
- 150000005323 carbonate salts Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 229920001688 coating polymer Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000036461 convulsion Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
Landscapes
- 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 invention relates to a method for preparing magnesium hydrate by using magnesite. The method sequentially comprises the steps that the magnesite is calcined by using an external combustion type rotary kiln so that light burned magnesium oxide can be obtained; the content of calcium sulfate in the light burned magnesium oxide is measured; the magnesium oxide is prepared into slurry with distilled water, barium chloride is added into the slurry, stirring and reaction are conducted, liquid is filtered out, drying is conducted, and thus dry magnesium hydrate is prepared; and coarse particles of the dry magnesium hydrate are screened out, so that the low-particle-size magnesium hydrate is prepared, wherein the particle size of the magnesite used for calcination is not larger than 20 mm, the primary air speed of the external combustion type rotary kiln is 50-55 m/s, the particle size of coal dust is 5-10 mm, the secondary air speed is 16-18 m/s, the ratio of the distilled water to the light burned magnesium oxide is 10:1-15:1, and the molar ratio of the barium chloride to the calcium sulfate is 2:1-3:1. According to the method for preparing the magnesium hydrate by using the magnesite, the low-particle-size magnesium hydrate can be prepared by calcining the magnesite with the external combustion type rotary kiln.
Description
Technical field
The present invention relates to it is a kind of using external-burning calcined by rotary kiln magnesite come the method for preparing light calcined magnesia.
Background technology
Magnesium hydroxide purposes widely, is the excellent flame retardant of plastics, rubber etc., is the rubber and plastic row generally acknowledged at present
There is in industry fire-retardant, suppression cigarette, the outstanding fire retardant of filling triple functions.As flue gas desulfurization agent in terms of environmental protection, can replace
The nertralizer of Caustic soda and Calx as acid-bearing wastewater.Oil dope is also acted as, anti-corrosion and desulfidation is played.In addition, may be used also
For electron trade, medicine, Saccharum Sinensis Roxb. it is refined, make insulation material and manufacture other magnesium salt products.For example, can be by hydroxide
Magnesium is used as fire retardant or fire-retardant filler is added in polyethylene, polypropylene, polystyrene and ABS resin, thus gives good
Fire-retardant and smoke elimination is acted on；Magnesium hydroxide can be also used for the manufacture of magnesium salt, the refined of Saccharum Sinensis Roxb., pharmaceuticals industry, daily-use chemical industry etc.；Hydrogen
Magnesium oxide is also used as antiacid, permeability aperient etc..At present, magnesium hydroxide is widely used in rubber, chemical industry, builds
In material, plastics and electronics, unsaturated polyester (UP) and paint, coating Polymer material.Particularly to mining air duct coating cloth,
The whole core conveyer belts of PVC, flame-retardant aluminum plastic plate, fire-retardant tarpaulin, PVC cable material, mine cable sheath, cable accessory it is fire-retardant,
Smoke elimination antistatic, can replace aluminium hydroxide, with excellent flame retardant effect.Magnesium hydroxide has compared with similar inorganic combustion inhibitor
There is more preferable smoke suppressing effect.Magnesium hydroxide unharmful substance discharge in production, use and waste procedures, and can also neutralize
The acid and corrosive gas produced in combustion process.As magnesium hydroxide and substrate resin have the good compatibility, it is thermoplastic
The property excellent fire retardant of resin and rubber, is commonly used for additive flame retardant or fire-retardant filler in adhesive.It is commercially used for
Manufacture refined magnesium salt, activated magnesia, medicine, fine ceramics, insulation material, Saccharum Sinensis Roxb., flue gas desulfurization agent, the addition of oil product anti-corrosion
Agent, acid-bearing wastewater nertralizer, colour kinescope cone glass coating etc..Due to magnesium hydroxide have it is colourless, nontoxic, tasteless, without corruption
The properties such as corrosion, are environmental type macromolecular material additives.Hydroxide with good lamellar or fibrous crystal form
Magnesium, preferably can be matched with raw material, and not affect the physical propertys such as the intensity of raw material, thus improve scratching for macromolecular material
Qu Qiangdu and elongation percentage.Either it is used for fire retardant, or for the additive of macromolecular material, either for food, medicine
Product or industrial products, the size of magnesium hydroxide are the factor of the primary importance of the performance for affecting products obtained therefrom all the time, are made especially
With magnesium hydroxide prepare nano material in the case of it is especially true, therefore be highly desirable to can be obtained low particle diameter magnesium hydroxide produce
Product.
The synthetic method of magnesium hydroxide mainly has salt lime method, salt Ammonia Process, concentrated seawater extraction method and aqua oxidation
Magnesium processes etc..But, magnesium hydroxide obtained in salt lime method haves the shortcomings that impurity is more, particle size is big；Salt Ammonia Process is deposited
Yield it is low, washing cycle is long the shortcomings of, and the little magnesium hydroxide of particle diameter cannot be obtained；Concentrated seawater extraction method equally exists miscellaneous
Matter is more, the problem that particle diameter is big；Aqua oxidation magnesium processes presently, there are that magnesium hydroxide aquation is bigger than low, magnesium hydroxide particle diameter and technique
The problems such as step is various.
Magnesite is the mineral name of magnesium carbonate.It is the natural alkaline raw mineral materials with magnesium carbonate as main component.Work
The magnesite applied in industry actually through the magnesite of processed, the magnesite mineral products crossed through processing, generally into
For magnesite.China's magnesite resource enriches, distributed more widely, and quality is high, and reserves are big.Sparry magnesite is mainly in Liaoning Province Yingkou
One band of Dashiqiao to Haicheng City, reserves account for the 80% of the whole nation.
The crystal structure of magnesite and property.Magnesite is common carbonate mineral, and the nothing such as calcite, dolomite
Aqueous carbonate salt mineral are referred to as calcite race mineral together, mineralogically.Calcite race crystallizable mineral construction is similar, sun from
Sub- radius is close, can form extensive isomorphism, in physical property again has similarity, often symbiosis and is mingled in one closely
Rise.
The chemical composition of magnesite.The main chemical compositions of sparry magnesite stone be magnesium oxide, submember be calcium oxide,
Silicon oxide, iron sesquioxide, aluminium sesquioxide.Content of magnesia is generally 35%-47%, calcium oxide 0.2%-4%, silicon oxide
The content of 0.2%-8%, iron sesquioxide and aluminium sesquioxide is typically below 1%.Trace element has P, Mn, Ti, Cr, Ni etc.
Kind more than 20, species are more, but without economic worth.
The physicochemical change of magnesite calcining.The chemical composition of giobertite still aoxidizes two containing three in addition to magnesium oxide
The impurity such as ferrum, aluminium sesquioxide, silicon oxide, calcium oxide, the basic physicochemical change occurred in calcination process：One is magnesite
The decomposition of ore deposit, the crystal growth of periclase crystal；Two is under high temperature action, between oxide impurity or oxide impurity and oxygen
Change magnesium to interact to form new mineral.
Calcining is thermal dissociation or the crystal phase transition process of mineral or synthetic compounds.Now, compound is at a certain temperature
Thermal dissociation is for the better simply compound of composition or crystal phase transition occurs, and is beneficial to subsequent treatment or making is selected product to be changed into be suitable to
The form that user needs.The change of magnesite calcination process, can be summarized as it is following some：The crystal grain of magnesite when (1) 500 DEG C
There is crackle；The magnesium oxide for occurring homogenizing when (2) 550 DEG C around magnesite granule gos deep into the inside of magnesite crystal grain；(3)
When 650 DEG C, magnesite disappears, and magnesium oxide local is presented anisotropism；When (4) 1100 DEG C, small magnesioferrite is formed in periclase
Therefore inclusion enclave, its color are also changed into brown.Temperature continues to be increased to what change is 1400 DEG C can't see, simply periclase brown
Deepen.
Calcining manners and control light roasting temperature is selected to be to obtain the light calcined magnesia important means with good aquation activity.
With the raising of calcining heat, the specific surface area of MgO is remarkably decreased.When temperature is more than 1300 DEG C, MgO recrystallization speed adds
Hurry up, dispersion drastically declines, activity is deteriorated.Different calcining manners and calciner is adopted to be also to affect at that same temperature
The key factor of MgO activity.
At present, the device for producing light calcined magnesia by high-temperature calcination magnesite mainly has reflecting kiln or shaft furnace, wherein adopts
It is the method that generally adopts with shaft furnace calcined magnesite to produce light calcined magnesia, but the method typically adopts bulk magnesite
Enter kiln calcining.As no constant temperature keeps process in the technical process, and enter stove magnesite nugget greatly, easily occur in the burning of surface
The phenomenon of heart underburnt, therefore there is streaking and active low shortcoming in gained light calcined magnesia.Further, since receiving furnace binding
And the restriction of process conditions, there is the requirement of any to entering furnace charge block size, such as shaft furnace enters furnace charge block size and requires not less than 40
Millimeter, so that large quantities of undersized material blocks and fine ore can not be used.On the other hand, during mining, output granularity is less than
25 millimeters of Ore accounts for 40 to 45%, and this part Ore is usually discarded or for paving the way, while the huge wasting of resources is caused
Soil is also taken up, environment is polluted, is caused serious environmental issue.
The device that light calcined magnesia is produced by high-temperature calcination magnesite also has tunnel cave, and tunnel cave is the continuous of modernization
Fixed wall and vault, bottom are arranged at the Thermal Equipment that formula is burnt till, usually one long linear tunnel, its both sides and top
Kiln car is run on the track of laying.Combustion apparatus is located at the middle part both sides of tunnel cave, constitutes fixed thermal zone burn till
Band (which is equipped with clinkering zone air-supply arrangement), effect of the high-temperature flue gas that burning is produced in tunnel cave front end chimney or air-introduced machine
Under, flow along tunnel to kiln hood direction, while preheating the product in kiln step by step, this section constitutes the pre- of tunnel cave
The torrid zone.Cold wind is blasted in the kiln tail of tunnel cave, latter section of product in cooling tunnel kiln, the cold wind for blasting flow through product and added
After heat, then feeding exsiccator is extracted out as the thermal source for being dried green compact, this section just constitutes the cooling zone of tunnel cave.Adopt at present
Tunnel cave calcines the mode of bulk magnesite, haves the shortcomings that calcination time is long, and often makes surface burning and internal raw
Burn, all the activity for making light-magnesite powder is reduced.
Therefore, the art also exists to using external-burning calcined by rotary kiln magnesite the light of high aquation activity is obtained
Burn oxidation magnesium oxide to prepare the needs of the method for the magnesium hydroxide of low granularity by hydration process.
The content of the invention
In order to solve the light-burned oxygen for preparing low granularity for utilizing external-burning calcined by rotary kiln magnesite to prepare high-quality
Said one or multiple problems in the presence of change magnesium, the present invention provide one kind in first aspect and prepare hydrogen using magnesite
Method of magnesium oxide, it is characterised in that methods described in turn includes the following steps：
A () obtains light calcined magnesia using external-burning calcined by rotary kiln magnesite；
B () measures the content of the calcium sulfate in the light calcined magnesia；
C magnesium oxide is prepared slurry using distilled water by (), and in slurry add barium chloride, in 45 DEG C to 55 DEG C of temperature
Stirred 6 to 7 hours with 400 to 500 revs/min of speed, so that magnesium oxide and distilled water reaction, then filter liquid, be obtained
Rough magnesium hydroxide；
D rough magnesium hydroxide is less than 1 weight % in 45 DEG C to 55 DEG C dryings to water content by (), be obtained and be dried hydroxide
Magnesium；With
E () is sieved to being dried magnesium hydroxide using the mesh screen with the mesh that aperture is less than 200 microns, screen out thick
Granule, so that be obtained magnesium hydroxide；
Wherein：
The external-burning rotary kiln is used for the magnesite of calcining with no more than 20 millimeters of particle diameter；
The wind speed of the First air for spray feed coal dust of the external-burning rotary kiln is 50 meter per seconds to 55 meter per seconds, coal dust
Granularity is 5 millimeters to 10 millimeters；
The wind speed of the secondary wind of the external-burning rotary kiln is controlled as 16 meter per seconds to 18 meter per seconds；
The envelope-bulk to weight ratio of the volume of the distilled water counted with milliliter and magnesium oxide in gram is as 10:1 to 15：1；
Barium chloride is 2 with the mol ratio of calcium sulfate:1 to 3:1.
The present invention mainly by improving the technological parameter of external-burning rotary kiln being obtained the light calcined magnesia of high-quality, and to
Add barium chloride to prepare the magnesium hydroxide with low particle diameter in light calcined magnesia.
Specific embodiment
As described above, the present invention first aspect provide it is a kind of using magnesite come the method for preparing magnesium hydroxide, its
It is characterised by, methods described in turn includes the following steps：
A () obtains light calcined magnesia using external-burning calcined by rotary kiln magnesite；
B () measures the content of the calcium sulfate in the light calcined magnesia；
C magnesium oxide is prepared slurry using distilled water by (), and in slurry add barium chloride, in 45 DEG C to 55 DEG C of temperature
Stirred 6 to 7 hours with 400 to 500 revs/min of speed, so that magnesium oxide and distilled water reaction, then filter liquid, be obtained
Rough magnesium hydroxide；
D rough magnesium hydroxide is less than 1 weight % in 45 DEG C to 55 DEG C dryings to water content by (), be obtained and be dried hydroxide
Magnesium；With
E () is sieved to being dried magnesium hydroxide using the mesh screen with the mesh that aperture is less than 200 microns, screen out thick
Granule, so that be obtained magnesium hydroxide；
Wherein：
The external-burning rotary kiln is used for the magnesite of calcining with no more than 20 millimeters of particle diameter；
The wind speed of the First air for spray feed coal dust of the external-burning rotary kiln is 50 meter per seconds to 55 meter per seconds, coal dust
Granularity is 5 millimeters to 10 millimeters；
The wind speed of the secondary wind of the external-burning rotary kiln is controlled as 16 meter per seconds to 18 meter per seconds；
The envelope-bulk to weight ratio of the volume of the distilled water counted with milliliter and magnesium oxide in gram is as 10:1 to 15：1；
Barium chloride is 2 with the mol ratio of calcium sulfate:1 to 3:1.
The present invention is in second aspect there is provided magnesium hydroxide obtained in the method by described in first aspect present invention.
In some embodiments, the temperature of step (c) and/or step (d) is 50 DEG C.
In other embodiment, the mesh screen in step (e) has the mesh of 100 micron pore sizes.
In some preferred embodiments, the light calcined magnesia is obtained by including following method such as：
(1) magnesite powder is broken into the ore deposit of no more than 20 millimeters (being for example not more than 20 millimeters, 18,15 or 10 millimeters)
Material；
(2) mineral aggregate is preheated in preheating zone so that mineral aggregate temperature reach 280 DEG C to 320 DEG C (such as 280,290,
300th, 310 or 320 DEG C)；
(3) by pass through preheating mineral aggregate clinkering zone 950 DEG C to 1300 DEG C (such as 950 DEG C, 960 DEG C, 970 DEG C, 980
DEG C, 990 DEG C, 1000 DEG C, 1100 DEG C, 1200 DEG C or 1300 DEG C) calcining 30 minutes to 50 minutes (such as 30 minutes, 40 minutes,
50 minutes；
(4) by pass through calcining mineral aggregate cooling zone be cooled to 100 DEG C to 150 DEG C (such as 100 DEG C, 110 DEG C, 120 DEG C,
130 DEG C, 140 DEG C or 150 DEG C)；
(5) mineral aggregate cooled down through step (4) is naturally cooled to into room temperature；With
(6) by the mineral aggregate of room temperature be crushed to granularity for no more than 100 microns (be for example not more than 100 microns, be not more than it is 90 micro-
Rice, be not more than 80 microns, be not more than 70 microns, be not more than 60 microns, be not more than 50 microns), obtain light calcined magnesia product；
Wherein：For spray feed coal dust First air wind speed be 50 meter per seconds to 55 meter per seconds (such as 50 meter per seconds, 51 meters/
Second, 52 meter per seconds, 53 meter per seconds, 54 meter per seconds or 55 meter per seconds), the granularity of coal dust be 5 millimeters to 10 millimeters (such as 5 millimeters, 6
Millimeter, 7 millimeters, 8 millimeters, 9 millimeters or 10 millimeters)；The blast velocity control of secondary wind be 16 meter per seconds to 18 meter per seconds (16 meter per seconds,
17 meter per seconds or 18 meter per seconds).
Some preferred embodiment in, in step (1), magnesite powder is broken into into no more than 15 millimeters of mineral aggregate.
Some preferred embodiment in, in step (3), clinkering zone 950 DEG C by pass through preheating mineral aggregates forge
Burn 50 minutes.Other preferred embodiment in, in step (3), clinkering zone 1300 DEG C calcine 30 minutes.
Some preferred embodiment in, in step (2), mineral aggregate is preheated to into 300 DEG C with 5 DEG C/min of speed.
Other preferred embodiment in, in step (4), will pass through calcining mineral aggregate it is mineral aggregate is cold with 5 DEG C/min of speed
But to 120 DEG C.
Some preferred embodiment in, the gradient of the external-burning rotary kiln is 3.5% to 3.8%, for example,
3.5%th, 3.6%, 3.7% or 3.8%.
The present invention is in second aspect there is provided magnesium hydroxide obtained in the method by described in first aspect present invention.
External-burning rotary kiln refers to rotary calcining kiln, belongs to building equipment class.In many such as building materials, metallurgy, chemical industry, environmental protection
In production industry, being widely used external-burning rotary kiln carries out machinery, physical or chemical treatment to solid material.
The structure of external-burning rotary kiln is known, generally comprises cylinder, wheel belt, support roller, gear wheel, sealing device, transmission
(axial flow blower of such as clinkering zone, beneficial to the formation of kliner coating, so that protect cylinder for device and auxiliary device；Sensing barrel temperature
Barrel temperature sensor and for measuring ammeter or power meter of torque etc.).Cylinder is usually by different-thickness steel plate thing
First be rolled into, in cylinder, be inlaid with refractory material such as refractory brick, outside cylinder, be cased with a few road wheel belt, cylinder into constant slope,
It is seated on the support roller corresponding with wheel belt.Actuating device include gear wheel, little gear, shaft coupling, main gear reducer and mair motor,
Attached reductor and accessory motor.
External-burning rotary kiln needs air-supply.Including offer First air and secondary wind.
First air is typically room temperature wind, is the natural air being forcibly fed into by main burner in kiln, by kiln hood once
Blower fan is supplied.Effect is mainly the required oxygen of fugitive constituent burning in pulverized coal conveying, and coal supply.It is thought that if air quantity mistake
Greatly, absorb heat after entering kiln, increase the heat consumption of quantity calcining, the thermal efficiency is reduced, and is unfavorable for the discharge of NOx.But, if First air
Very few, fugitive constituent burning is slow, affects burning of coal speed, therefore, the wind speed of First air is generally 50 meter per seconds to 70 metre per second (m/s)s.
Secondary wind is, in order to not allow material to be limited by various conditions in kiln, to set up the offer of post-blast device
Wind, because calcining materials are in moving process, the thing section in surface is subject to the convection current of thermal current and heat radiation heating, is also subject to
The radiant heating of scorching hot refractory lining；The material for pressing close to liner is then directly heated by scorching hot refractory material；In heap
Material in the middle of product section is then heated by the conduction of heat of calcining materials itself.Thing is trembled because kiln body is rotated and does not stop to stir, and Shi Wu sections hand over
For being heated, temperature of charge is than more uniform.After setting up post-blast, from material escape volatile matters burning required air mainly by
Post-blast is supplied.The general Jing coolers of secondary wind are preheated to 650 DEG C to 1000 DEG C, after enter kiln, air-flow is produced and strong is disturbed
It is dynamic, be conducive to the burning of carbon.The wind speed size of secondary wind determines the size of convulsion ability in kiln, it is considered that, the wind of secondary wind
Speed is too small, and flame is too short, and the wind speed of secondary wind is big, and flame is long, thus it is general by the wind speed of secondary wind adjusting the length of flame
Degree.In order to control the length of flame and the burning velocity of coal dust, typically by the blast velocity control of secondary wind 9 meter per seconds to 12 meters/
Second.
However, based on the reason for as described above, in prior art, the wind speed of First air is generally 50 meter per seconds to 70 meter per seconds
In the range of, the wind speed general control of secondary wind is in the range of 9 meter per seconds to 12 meter per seconds.In such First air wind speed and two
Under conditions of secondary wind wind speed, it is impossible to be adapted to generate the light-burned oxidation of high-quality by the temperature control of the clinkering zone of external-burning rotary kiln
In the range of the temperature (it is generally acknowledged that 900 DEG C to 1300 DEG C) of magnesium.The present inventor is had found through further investigation, if by First air
Wind speed be limited in not higher than 55 meter per seconds, such as in the range of 50 meters/meter to 55 meter per seconds, and the wind speed of secondary wind is provided
To more than 16 meter per seconds, for example, improve to 16 meter per seconds to 18 meter per seconds, then the temperature stabilization of clinkering zone is maintained at into calcining and is prepared
900 DEG C to 1300 DEG C needed for light calcined magnesia are just possibly realized, and can be prepared using such process conditions and have
The light calcined magnesia of high aquation activity and burn tinctuer.
In the light calcined magnesia product by obtained in magnesite, often containing other impurity components such as calcium sulfate,
This impurity will not usually give what is thoroughly removed if not affecting the performance of obtained magnesium oxide.The present inventor
If it was unexpectedly observed that adding suitable in slurry when using using Preparation of Magnesium Hydroxide Using Magnesium Oxide obtained in the method for the present invention
During the barium chloride of amount, can be with magnesium hydroxide products of the acquisition with low particle diameter (low D50).Specifically, by light-burned oxidation
Magnesium powder is broken to desired particle size and is for example not more than 100 microns, such as no more than 80 microns or no more than 50 microns afterwards, measures institute
State contained calcium sulphate content in light calcined magnesia, and with 2:1 to 3:1 barium chloride and the mol ratio of calcium sulfate are to described light
Add barium chloride in burned magnesium oxide, so as to the chloride containing barium raw material for preparing hydro-oxidation magnesium is obtained.Then pass through hydration method
Magnesium hydroxide is prepared using the chloride containing barium raw material, it is possible thereby to be worth the magnesium hydroxide product of low particle diameter.
Embodiment
Hereafter the present invention will be further detailed using embodiment by way of illustration, but these
Embodiment is not construed as limiting the invention.
, purchased from Shanghai with power heavy-duty machinery company limited, its specification is as follows for external-burning rotary kiln used in embodiment：
Diameter：4m；Length：60m；Gradient：3.8%；Production capacity：2500 ton days；
Kiln body rotating speed：0.41 to 4.07 rev/min；
Main transmission：Motor：ZSN4-355-092；Reductor：YNS1110-22.4V.Accessory drive：Motor：
Y180L-4；Decelerator：YNS440-45-II.
From Henan table mountain, content of magnesia is 45.89 weight % to the magnesite used by embodiment, theoretical burn tinctuer
For 51.5%, theoretical aquation activity is 43.2%.Using jaw crusher, (PE250 × 400, purchased from Shanghai with power heavy-duty machinery
Company limited) magnesite is broken into into the mineral aggregate with no more than 20 millimeters of granularity, then by the mineral aggregate rotating speed be 0.8
Rev/min the preheating zone of the external-burning rotary kiln be preheated to 300 DEG C with 5 DEG C/min of speed；The mineral aggregate of preheating will be passed through
Calcine 40 minutes at 1030 DEG C in clinkering zone.After calcining, will through mineral aggregate calcining in cooling zone with 5 DEG C/min of cooling
Speed is cooled to 120 DEG C, then naturally cools to room temperature again.Then, room temperature mineral aggregate is crushed to into the powder that granularity is 80 microns,
So as to obtain light calcined magnesia product.
The aquation activity of measurement gained light calcined magnesia and burn tinctuer.Wherein, aquation activity characterizes the suction of light calcined magnesia
Outlet capacity, aquation activity are high then high with the ability of water reaction, i.e. the aquation activity of light calcined magnesia is big.Aquation activity determination method
It is as follows.Light calcined magnesia of the weight for Wi is weighed, then with the abundant moistening of water (do not drip and be defined), then in an oven 150
DEG C dry to 2 hours, then weigh the weight (Wwd) of the light calcined magnesia after drying, aquation is calculated by equation below then
Activity (A)：
A=(Wwd Wi)/Wwd X100% (1)
Burn tinctuer characterizes magnesite through the lost percentage by weight of calcining, can be calculated with equation below (2)：
Burn out rate=(W1-W2)/W1X100% (2)
Wherein, the weight of magnesite before W1 is calcining, W2 are the light-burned oxygen of gained after the magnesite of corresponding weight is calcined
Change the weight of magnesium.As a result referring to table 2.
In addition, in addition to the content that table 1 below and its table are betted, to carry out with 1 described program identical mode of embodiment
Embodiment 1 to 14.
Flame temperature and its standard deviation (n=20) of the table 1 using the clinkering zone obtained by different wind speed
Note：
*：Breeze is crushed to no more than 25 millimeters.
#：Mineral aggregate is preheated to 400 DEG C.
Flame temperature is using the YT-16 external-burnings revolution dispensed with power heavy-duty machinery company limited from Shanghai in clinkering zone position
The data that kiln temperature measurer is measured, data every 5 minutes in the middle part of clinkering zone flame central position gather once, for collection 20 times,
Ask calculation meansigma methodss and standard deviation (i.e. temperature is inclined).
As it can be seen from table 1 stably will obtain to be suitable for calcining the calcining needed for obtaining light calcined magnesia by magnesite
Temperature needs low secondary wind speed and is in the higher secondary wind wind speed of proper range.
The burn tinctuer and water activity (n=5) of the light calcined magnesia obtained by 2 embodiment 1 to 14 of table.
| Embodiment is numbered | Light calcined magnesia | Burn tinctuer (%) | Water activity (%) |
| 15 | Embodiment 1 | 49.2 | 38.1 |
| 16 | Embodiment 2 | 51.3 | 40.9 |
| 17 | Embodiment 3 | 51.4 | 41.1 |
| 18 | Embodiment 4 | 43.6 | 28.0 |
| 19 | Embodiment 5 | 41.8 | 27.6 |
| 20 | Embodiment 6 | 38.2 | 22.8 |
| 21 | Embodiment 7 | 42.1 | 29.6 |
| 22 | Embodiment 8 | 44.6 | 30.1 |
| 23 | Embodiment 9 | 51.2 | 41.5 |
| 24 | Embodiment 10 | 50.9 | 40.5 |
| 25 | Embodiment 11 | 45.9 | 26.4 |
| 26 | Embodiment 12 | 43.2 | 21.7 |
| 27 | Embodiment 13 | 37.1 | 33.4 |
| 28 | Embodiment 14 | 50.6 | 39.8 |
If from Table 2, it can be seen that the wind speed of First air is excessive and secondary wind wind speed is too low or too high, can affect
The degree of calcination (reducing burn tinctuer) of magnesite is reduced, and is reduced through light-burned oxygen obtained in external-burning calcined by rotary kiln
Change the aquation activity of magnesium, thus it is speculated that there may be relation with temperature and its stability.
Magnesium hydroxide is prepared by hydration process using light calcined magnesia obtained in section Example of the present invention 2 and 7.Specifically
Say that the calcium sulphate content for measuring light calcined magnesia obtained in embodiment 2 and 7 is respectively 0.63 mass % and 0.69 weight % in ground.
According to 1:10 w/v (g/ml) by magnesium oxide and distilled water and barium chloride (using without barium chloride as control)
Mix and be positioned in the reactor in 50 DEG C of water-baths, stirred 6 hours with 400 revs/min of speed, liquid is filtered by sucking filtration
Body, is obtained rough magnesium hydroxide.Then 50 DEG C of dryings to constant weight (water content is less than 1 weight %), it is obtained and is dried hydrogen-oxygen
Change magnesium, residue on sieve is screened out using 100 micron mesh screens, obtain final magnesium hydroxide products, and according to HG/T 3607-2007
Method measurement D50 described in (issuing on 04 13rd, 2007, on October 01st, 2007 implements).As a result it is displayed in table 3 below.
D50 (micron) of the table 3 using magnesium hydroxide obtained in the light calcined magnesia obtained by embodiment 2 and 7.
| Embodiment is numbered | Light calcined magnesia | Barium chloride：The molar ratio of calcium sulfate | D50 (micron) |
| 29 | Embodiment 2 | 0 | 9.0 |
| 30 | Embodiment 2 | 1 | 4.4 |
| 31 | Embodiment 2 | 2 | 1.2 |
| 32 | Embodiment 2 | 3 | 1.5 |
| 33 | * embodiment 7 | 0 | 15.0 |
| 34 | Embodiment 7 | 1 | 12.0 |
| 35 | Embodiment 7 | 2 | 8.1 |
| 36 | Embodiment 7 | 3 | 6.8 |
From table 3 it can be seen that when appropriate barium chloride is added, can obtain in the case of without any post processing
The much lower magnesium hydroxide products of particle diameter.When barium chloride is 2 with the mol ratio of barium sulfate:1 to 3:Hydrogen when 1, obtained by embodiment 2
Magnesium oxide product can basically reach or be close to the I class products that HG/T 3607-2007 specify without any post processing, D50
Standard.But, if the barium chloride for adding is too low, D50 is still larger, thus it is speculated that possibly barium chloride plays dispersion wherein
The effect of agent.Especially for the light calcined magnesia obtained by embodiment 2, the effect of barium chloride is more significantly.
Claims (9)
1. a kind of method that use magnesite prepares magnesium hydroxide, it is characterised in that methods described in turn includes the following steps：
A () obtains light calcined magnesia using external-burning calcined by rotary kiln magnesite；
B () measures the content of the calcium sulfate in the light calcined magnesia；
C magnesium oxide is prepared slurry using distilled water by (), and in slurry add barium chloride, 45 DEG C to 55 DEG C of temperature with
400 to 500 revs/min of speed is stirred 6 to 7 hours, so that magnesium oxide and distilled water reaction, then filter liquid, is obtained thick
Hydrogen manufacturing magnesium oxide；
D rough magnesium hydroxide is less than 1 weight % in 45 DEG C to 55 DEG C dryings to water content by (), be obtained and be dried magnesium hydroxide；With
E () is sieved to being dried magnesium hydroxide using the mesh screen with the mesh that aperture is less than 200 microns, screen out thick
Grain, so that be obtained magnesium hydroxide；
Wherein：
The external-burning rotary kiln is used for the magnesite of calcining with no more than 20 millimeters of particle diameter；
The wind speed of the First air for spray feed coal dust of the external-burning rotary kiln be 50 meter per seconds to 55 meter per seconds, the granularity of coal dust
For 5 millimeters to 10 millimeters；
The wind speed of the secondary wind of the external-burning rotary kiln is controlled as 16 meter per seconds to 18 meter per seconds；
The envelope-bulk to weight ratio of the volume of the distilled water counted with milliliter and magnesium oxide in gram is as 10:1 to 15：1；
Barium chloride is 2 with the mol ratio of calcium sulfate:1 to 3:1.
2. method according to claim 1, it is characterised in that the temperature of step (c) and/or step (d) is 50 DEG C.
3. method according to claim 1, it is characterised in that the mesh screen in step (e) has the net of 100 micron pore sizes
Hole.
4. method according to claim 1, it is characterised in that the light calcined magnesia is obtained by the following method：
(1) magnesite powder is broken into no more than 20 millimeters of mineral aggregate；
(2) mineral aggregate is preheated in preheating zone, so that mineral aggregate temperature reaches 280 DEG C to 320 DEG C；
(3) mineral aggregate for passing through preheating is calcined 30 minutes to 50 minutes at 950 DEG C to 1300 DEG C in clinkering zone；
(4) mineral aggregate for passing through calcining is cooled to into 100 DEG C to 150 DEG C in cooling zone；
(5) mineral aggregate cooled down through step (4) is naturally cooled to into room temperature；With
(6) mineral aggregate of room temperature is crushed to into granularity for no more than 100 microns, obtains light calcined magnesia product.
5. magnesite powder is broken into no more than 15 millis by method according to claim 4, it is characterised in that in step (1)
The mineral aggregate of rice.
6. method according to claim 4, it is characterised in that in step (2), breeze is preheating to into 300 DEG C.
7. method according to claim 4, it is characterised in that in step (3), will be through pre- at 950 DEG C in clinkering zone
The mineral aggregate of heat is calcined 50 minutes.
8. method according to claim 4, it is characterised in that the rotating speed of the external-burning rotary kiln be 0.6 rev/min extremely
0.9 rev/min.
9. method according to claim 4, it is characterised in that in step (4), will pass through the mineral aggregate of calcining with 5 DEG C/minute
Mineral aggregate is cooled to 120 DEG C by the speed of clock.
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| CN111348844B (en) * | 2020-03-12 | 2021-11-26 | 辽宁科大中驰镁建材科技有限公司 | System and process for preparing light-burned magnesia powder by using low-grade high-calcium magnesite |
| CN112066720B (en) * | 2020-08-04 | 2022-09-23 | 广东摩德娜科技股份有限公司 | Cooling method for quenching section of tunnel kiln and tunnel kiln control device |
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| CN101984319A (en) * | 2010-12-08 | 2011-03-09 | 鞍山市华杰建材技术开发有限公司 | Energy-saving and efficiency-improvement double-temperature-field rotary kiln system |
| CN102149639A (en) * | 2008-07-10 | 2011-08-10 | 伊梅里斯矿物有限公司 | Magnesium hydroxide |
| CN103011630A (en) * | 2012-12-26 | 2013-04-03 | 新疆蓝天镁业股份有限公司 | Method of producing high-purity magnesium hydroxide and magnesium oxide by low-grade magnesite |
| WO2015051482A1 (en) * | 2013-10-11 | 2015-04-16 | 河北联合大学 | Method for manufacturing sheet monodisperse nano-magnesium hydroxide by using magnesite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102149639A (en) * | 2008-07-10 | 2011-08-10 | 伊梅里斯矿物有限公司 | Magnesium hydroxide |
| CN101984319A (en) * | 2010-12-08 | 2011-03-09 | 鞍山市华杰建材技术开发有限公司 | Energy-saving and efficiency-improvement double-temperature-field rotary kiln system |
| CN103011630A (en) * | 2012-12-26 | 2013-04-03 | 新疆蓝天镁业股份有限公司 | Method of producing high-purity magnesium hydroxide and magnesium oxide by low-grade magnesite |
| WO2015051482A1 (en) * | 2013-10-11 | 2015-04-16 | 河北联合大学 | Method for manufacturing sheet monodisperse nano-magnesium hydroxide by using magnesite |
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Effective date of registration: 20200820 Address after: 41-11-2, No. 17, yingnaili, Dashiqiao City, Yingkou City, Liaoning Province, 115100 Patentee after: Liu Xin Address before: No.17, yingnaili, Dashiqiao, Yingkou, Liaoning Province 41-03-6 Patentee before: Yao Shengduo |
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Effective date of registration: 20201113 Granted publication date: 20170322 |