NO141366B - PROCEDURE FOR THE PREPARATION OF A PROPOSAL MAGNESIUM CARBONATE CONTAINING, SMALL PLATE SHAPED CALCIUM-MAGNESIUM CARBONATE MIXTURE WITH BASIC NATURE - Google Patents
PROCEDURE FOR THE PREPARATION OF A PROPOSAL MAGNESIUM CARBONATE CONTAINING, SMALL PLATE SHAPED CALCIUM-MAGNESIUM CARBONATE MIXTURE WITH BASIC NATURE Download PDFInfo
- Publication number
- NO141366B NO141366B NO760148A NO760148A NO141366B NO 141366 B NO141366 B NO 141366B NO 760148 A NO760148 A NO 760148A NO 760148 A NO760148 A NO 760148A NO 141366 B NO141366 B NO 141366B
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- Prior art keywords
- magnesium carbonate
- calcium
- magnesium
- carbonate
- basic
- Prior art date
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- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 title description 17
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title description 16
- 239000001095 magnesium carbonate Substances 0.000 title description 16
- 229910000021 magnesium carbonate Inorganic materials 0.000 title description 16
- 239000000203 mixture Substances 0.000 title description 14
- 238000000034 method Methods 0.000 title description 10
- 238000002360 preparation method Methods 0.000 title description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 21
- 239000000725 suspension Substances 0.000 description 21
- 229910000514 dolomite Inorganic materials 0.000 description 17
- 239000010459 dolomite Substances 0.000 description 17
- 235000014380 magnesium carbonate Nutrition 0.000 description 15
- 229960001708 magnesium carbonate Drugs 0.000 description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 13
- 229910002092 carbon dioxide Inorganic materials 0.000 description 12
- 239000000047 product Substances 0.000 description 11
- 239000001569 carbon dioxide Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000395 magnesium oxide Substances 0.000 description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 6
- 238000001354 calcination Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 235000012254 magnesium hydroxide Nutrition 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- KPAMAAOTLJSEAR-UHFFFAOYSA-N [N].O=C=O Chemical compound [N].O=C=O KPAMAAOTLJSEAR-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000007787 solid 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
- C01F5/24—Magnesium carbonates
-
- 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
- C01F11/18—Carbonates
-
- 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
- C01F11/18—Carbonates
- C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/20—Powder free flowing behaviour
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Description
Oppfinnelsen vedrører en fremgangsmåte til fremstilling av en overveiende magnesiumkarbonat-holdig, småplateformet kalsium-magnesium-karbonat-blanding med basisk karakter. The invention relates to a method for producing a predominantly magnesium carbonate-containing, small plate-shaped calcium-magnesium-carbonate mixture with a basic character.
Slike karbonater anvendes i teknikken til tallrike formål og fremstilles etter forskjellige fremgangsmåter av egnede utgangsstoffer. Et lett og i store mengder oppnåelig råmaterial som inneholder kalsium og magnesium i karbonatform ville være dolomit. Mot den prisgunstige fremstilling av karbonater av dolomit står imidlertid imot at oppslutningen er vanskelig. Such carbonates are used in technology for numerous purposes and are produced by various methods from suitable starting materials. An easy and obtainable raw material in large quantities containing calcium and magnesium in carbonate form would be dolomite. The cost-effective production of carbonates of dolomite is, however, opposed by the fact that the absorption is difficult.
Spesielt lar dolomit seg bare vanskelig bringe i en egnet fin- In particular, dolomite can only be brought into a suitable fin-
delt form slik den under tiden er nødvendig for fremstilling av fremfor alt anvendelse av karbonatene. divided form as it is currently necessary for the production of, above all, the use of the carbonates.
Det er kjent, av dolomitt å fremstille magnesium-karbonat ved at man oppløser dolomitt i konsentrert kald salt- It is known to produce magnesium carbonate from dolomite by dissolving dolomite in concentrated cold salt
syre, adskiller kiselsyre samt aluminium og jern som hydrok- acid, separates silicic acid as well as aluminum and iron as hydro-
syder og overfører det i den klare oppløsning gjenblivne kalsium og magnesium i magnesiumkarbonat ved tilsetning av natriumkarbonat. Ved tilsetning av svovelsyre til oppløsningen kan kalken felles boils and transfers the remaining calcium and magnesium in the clear solution into magnesium carbonate by adding sodium carbonate. By adding sulfuric acid to the solution, the lime can precipitate
ut som sulfat. Denne og lignende fremgangsmåter har imidlertid, såvidt det er kjent ikke kunnet finne noen større industriell anvendelse, fordi en gjenvinning av den anvendte saltsyre bare er mulig med store omkostninger. out as sulfate. However, as far as is known, this and similar methods have not been able to find any major industrial application, because a recovery of the hydrochloric acid used is only possible at great expense.
Til grunn for oppfinnelsen ligger den oppgave å til-veiebringe en storteknisk gjennomførbar, billig fremgangsmåte til fremstilling av en småplateformet kalsiummagnesiumkarbonat-blanding med basisk karakter fra dolomitt og som ikke krever noen oppslutningskjemikalier og andre reaksjonsdeltagere, idet det dannede produkt har en pH-verdi mellom 7 og 8, og en shape-faktor på minst 1:80. The invention is based on the task of providing a highly technically feasible, inexpensive method for producing a small plate-shaped calcium magnesium carbonate mixture with a basic character from dolomite and which does not require any digestion chemicals and other reaction participants, as the product formed has a pH value between 7 and 8, and a shape factor of at least 1:80.
Denne oppgave løses ifølge oppfinnelsen ved at man omdanner dolomitten ved oppvarming til ca. 1000 til ca. 1100°C i en blanding av kalsiumoksyd og magnesiumoksyd suspenderer den dannede oksydblanding i vektforhold på minst 20:1 i vann og til-bakedanner de derved i suspensjonen dannede hydroksyder ved inn-føring av karbondioksyd i de tilsvarende karbonater. According to the invention, this task is solved by converting the dolomite by heating to approx. 1000 to approx. 1100°C in a mixture of calcium oxide and magnesium oxide suspends the formed oxide mixture in a weight ratio of at least 20:1 in water and regenerates the hydroxides thus formed in the suspension by introducing carbon dioxide into the corresponding carbonates.
Til denne behandling kan det på i og for seg kjent måte slutte seg en adskillelse av eventuelt forstyrrende for-urensninger resp. en opparbeidelse til de respektive karbonater. This treatment can be followed in a manner known per se by a separation of possibly disturbing contaminants or a preparation for the respective carbonates.
For rekarboniseringen kan det anvendes de karbon-dioksydholdige avgasser fra dolomit-kalsineringen således at det ikke er nødvendig med noen spesiell karbonsyretilførsel. Imidlertid skal det forstås at også rent C02 eller en karbondioksyd-nitrogen-blanding av annen opprinnelse kommer i betrakt-ning for gassbehandlingen. Denne gjennomføres fortrinnsvis under intens bevegelse av suspensjonen. For the recarbonation, the carbon dioxide-containing exhaust gases from the dolomite calcination can be used so that no special carbonic acid supply is necessary. However, it should be understood that pure C02 or a carbon dioxide-nitrogen mixture of other origin is also taken into account for the gas treatment. This is preferably carried out during intense movement of the suspension.
Kalsineringen av dolomitten gjennomføres fortrinnsvis i en dreierørsovn. The calcination of the dolomite is preferably carried out in a rotary kiln.
Når det også tilsvarende oppfinnelsens målsetning When it also corresponds to the objective of the invention
i første rekke er å anvende naturlig dolomitt som utgangsmate-riale, så kan grunnideen ved fremgangsmåten ifølge oppfinnelsen også anvendes på syntetiske produkter av dolomitlignende beskaffenhet og sammensetning. is primarily to use natural dolomite as starting material, then the basic idea of the method according to the invention can also be applied to synthetic products of dolomite-like nature and composition.
Den med karbondioksyd behandlede suspensjon kan videreanvendes som sådan, eventuelt etter inndampning, eller de ønskede karbonater kan adskilles fra suspensjonen. På denne måte er det ved fremgangsmåten ifølge oppfinnelsen ved siden av CaCO-j på enkel måte fremfor alt tilgjengelig basiske magnesium-eller kalsium-magnesium-karbonater. The suspension treated with carbon dioxide can be used as such, possibly after evaporation, or the desired carbonates can be separated from the suspension. In this way, with the method according to the invention, next to CaCO-j, basic magnesium or calcium-magnesium carbonates are above all readily available.
Fremgangsmåter til fremstilling av utfelt basisk magnesiumkarbonat resp. kalsium-karbonat er riktignok allerede kjent. Under forskjellige betingelser, f.eks. forskjellige temperaturer, konsentrasjoner osv., kan det hertil føres CC^ i oppslemninger av CaO resp. CafOH)^ eller MgO resp. Mg(OH)2. Procedures for the production of precipitated basic magnesium carbonate or calcium carbonate is, of course, already known. Under different conditions, e.g. different temperatures, concentrations, etc., CC^ in slurries of CaO or CafOH)^ or MgO resp. Mg(OH)2.
Alt etter kravene kan det fremstilles tilsvarende blandinger av produktene. Man krever imidlertid adskilte apparaturer, når man - idet det gåes ut fra hver gang rene stoffer - på denne måte vil fremstille et basisk kalsium-magnesium-karbonat med et nøyaktig definert kalsium-magnesium-molforhold ca. 1:1, som skal finne videreanvendelse i form av en stabil suspensjon. Depending on the requirements, corresponding mixtures of the products can be produced. Separate apparatus is required, however, when - starting from pure substances each time - in this way you want to produce a basic calcium-magnesium carbonate with a precisely defined calcium-magnesium molar ratio of approx. 1:1, which will find further use in the form of a stable suspension.
Ifølge oppfinnelsen lar de tilstrebede produkter seg derimot prisgunstig og uten spesielle komplikasjoner fremstilles på den tilsynelatende omvei av fremgangsmåten ifølge oppfinnelsen over oksydene resp. hydroksydene. Spesielt er det mulig i en eneste apparatur på enkel måte å fremstille et kalsium-magnesium-karbonat med et bestemt kalsium-magnesium-forhold. Som det dessuten videre forklares utmerker produktene seg dessuten ved spesielle egenskaper som gjør dem verdifulle for bestemte produkter. According to the invention, on the other hand, the desired products can be produced inexpensively and without particular complications in the apparent detour of the method according to the invention over the oxides or the hydroxides. In particular, it is possible in a single apparatus in a simple way to produce a calcium-magnesium carbonate with a specific calcium-magnesium ratio. As is further explained, the products are also distinguished by special properties that make them valuable for certain products.
Fremstillingen av basisk kalsium-magnesium-karbonat foregår ifølge oppfinnelsen ved at man kalsinerer dolomitt, av-lesker produktet og suspenderer i vann i vektforhold på 20-60 deler vann på 1 del oksyd og inndamper suspensjonen etter gass-behandling med karbondioksyd. The production of basic calcium-magnesium carbonate takes place according to the invention by calcining dolomite, leaching the product and suspending it in water in a weight ratio of 20-60 parts water to 1 part oxide and evaporating the suspension after gas treatment with carbon dioxide.
Den derved dannede suspensjon inneholder det ønskede basiske kalsium-magnesium-karbonat, nemlig i et definert kalsium/ magnesium-forhold som tilsvarer det opprinnelige kalsium-magnesium-forhold i den anvendte dolomitt. Det er imidlertid uten videre mulig å påvirke dette forhold. En suspensjon med avvikende kalsium-magnesium-forhold kan f.eks. lett fåes ved tildosering av CaO og/eller MgO resp. Ca(0H)2 og/eller Mg(OH)2 eller utfelt kalsium- resp. magnesiumkarbonat til utgangsstoffet eller til suspensjonen før, under eller etter C02~innføringen. Likeledes kan man ved adskillelse av kalsiumkarbonatet komme til en suspensjon som dessuten bare inneholder magnesiumkarbonat i basisk form. The resulting suspension contains the desired basic calcium-magnesium carbonate, namely in a defined calcium/magnesium ratio which corresponds to the original calcium-magnesium ratio in the dolomite used. However, it is easily possible to influence this relationship. A suspension with a deviant calcium-magnesium ratio can, for example, easily obtained by adding CaO and/or MgO resp. Ca(OH)2 and/or Mg(OH)2 or precipitated calcium or magnesium carbonate to the starting material or to the suspension before, during or after the C02 introduction. Similarly, by separating the calcium carbonate, a suspension can also be obtained which also only contains magnesium carbonate in basic form.
Oppfinnelsen vedrører nu fremgangsmåte til fremstilling av en overveiende magnesium-karbonat-holdig,småplateformet kalsium-magnesium-karbonat-blanding med basisk karakter, idet man kalsinerer dolomitt, lesker produktet, suspenderer det i vann, innfører karbondioksyd og frafiltrerer uoppløst kalsium-karbonat, idet fremgansgmåten er karakterisert ved at man innstiller suspensjonen på ca. 60 deler vann til 1 del oksyd, holder suspensjonens temperatur under karbondioksydtilsetningen under 30°C og oppvarmer oppløsningen etter adskillelse av uoppløst kalsiumkarbonat med en oppvarmningshastighet på minst 10°C/min. til temperaturer mellom 70-80°C, inntil det basiske magnesium-karbonat er utfelt. The invention now relates to a method for producing a predominantly magnesium-carbonate-containing, small plate-shaped calcium-magnesium-carbonate mixture with a basic character, by calcining dolomite, leaching the product, suspending it in water, introducing carbon dioxide and filtering out undissolved calcium carbonate, The procedure is characterized by setting the suspension to approx. 60 parts water to 1 part oxide, maintains the temperature of the suspension during the carbon dioxide addition below 30°C and heats the solution after separation of undissolved calcium carbonate at a heating rate of at least 10°C/min. to temperatures between 70-80°C, until the basic magnesium carbonate is precipitated.
Det på den omtalte måte tilgjengelige basiske magnesiumkarbonat adskiller seg egenartet ved sin småplateform fra det basiske magnesiumkarbonat, som ble fremstilt ved karboni-sering av utfelt Mg(OH)2 og som er nåleformet, likeledes som også det fra en magnesiumsulfatoppløsning med soda utfelte basiske magnesiumkarbonat. Produktet ved fremgangsmåten ifølge oppfinnelsen utmerker seg videre ved en høy shape-faktor på minst 1:80 og er meget findelt. Det lar seg eksempelvis anvende i den keramiske industri. The basic magnesium carbonate available in the manner described differs uniquely in its small plate form from the basic magnesium carbonate, which was produced by carbonization of precipitated Mg(OH)2 and which is needle-shaped, as well as the basic magnesium carbonate precipitated from a magnesium sulfate solution with soda . The product of the method according to the invention is further distinguished by a high shape factor of at least 1:80 and is very finely divided. It can be used, for example, in the ceramic industry.
Også det ifølge oppfinnelsen oppnåelige kalsium-magnesiumkarbonat er finkornet og overveiende småplateformet. Dette produkt er på grunn av sin beskaffenhet egnet til anvendelse i papirindustrien. The calcium-magnesium carbonate obtainable according to the invention is also fine-grained and predominantly plate-shaped. Due to its nature, this product is suitable for use in the paper industry.
Ved en fordelaktig utførelsesform ifølge oppfinnelsen utgjør finheten av kalsium-magnesium-karbonatet 100% under 1 unt. In an advantageous embodiment according to the invention, the fineness of the calcium-magnesium carbonate amounts to 100% below 1 unt.
Videre er det hensiktsmessig, når kalsium-magnesium-karbonatets spesifikke overflate ligger i størrelsesorden på 20 m<2>/g. Furthermore, it is appropriate when the specific surface area of the calcium-magnesium carbonate is in the order of 20 m<2>/g.
Videre er det av fordel, når det basiske kalsium-magnesium-karbonat har en hvithetsgrad over 95%. Furthermore, it is advantageous when the basic calcium-magnesium carbonate has a degree of whiteness above 95%.
En fordelaktig utførelsesform består i anvendelse An advantageous embodiment consists in application
av småplateformet dannede kalsium-magnesium-karbonatpartikler med en shåpe-faktor, som er en tierpotens større enn hos kaolin. of small plate-shaped formed calcium-magnesium-carbonate particles with a Schöpe factor, which is a third power higher than that of kaolin.
Oppfinnelsen skal forklares nærmere ved hjelp av The invention shall be explained in more detail by means of
noen utførelseseksempler. some execution examples.
Eksempel 1 Example 1
Dolomitt oppvarmes i en dreierørsovn på ca. 1100°C, hvorved det fåes en CaO-MgO-blanding. Denne oksydblanding leskes med vann omtrent i vektforhold 1:20 og ved samtidig intens gjennomblanding med de i dreierørsovnen dannede rensede avgasser rekarboniseres til et basisk kalsium-magnesium-karbonat. Den deretter ca. 8% faststoffholdige suspensjon inndampes over en sentrifuge eller konsentreres ved passering gjennom en filterpresse. Ved tilsetning av et dispergeringsmiddel fåes en stabil suspensjon. Dolomite is heated in a rotary tube furnace of approx. 1100°C, whereby a CaO-MgO mixture is obtained. This oxide mixture is diluted with water in a weight ratio of approximately 1:20 and, by simultaneous intense mixing with the purified exhaust gases formed in the rotary tube furnace, is recarbonated to a basic calcium-magnesium carbonate. The then approx. The 8% solids suspension is evaporated over a centrifuge or concentrated by passing through a filter press. By adding a dispersant, a stable suspension is obtained.
Eksempel 2 Example 2
En ved brenning av dolomitt dannet CaO-MgO-blanding leskes etter tilsetning av 5% CaO. Rekarboniseringen av CaO og MgO foregår under ompumpingen med en ompumpingspumpe ved tilsetning av CO21 idet det foregår en spesielt god absorbsjon. Etter inndamping av suspensjonen over en filterpresse fåes ved tilsetning av dispergeringsmidlet en stabil suspensjon. A CaO-MgO mixture formed by burning dolomite is leached after adding 5% CaO. The recarbonation of CaO and MgO takes place during repumping with a repumping pump by adding CO21, as a particularly good absorption takes place. After evaporation of the suspension over a filter press, a stable suspension is obtained by adding the dispersant.
I begge eksempler fremkommer derved det basiske kalsium-magnesium-karbonat for en overveiende del i småplateformet struktur. In both examples, the basic calcium-magnesium-carbonate appears for the most part in a small plate-shaped structure.
Eksempel 3 Example 3
Til fremstilling av basisk magnesiumkarbonat går For the production of basic magnesium carbonate goes
man i detalj frem som følger: in detail as follows:
I første rekke oppvarmes dolomitten til temperaturer på ca. 1000°C, idet de unnviker karbondioksyd og det blir til-bake en blanding av CaO med MgO. Etter leskin innføres i suspensjonen etter fortynning til ca. 1 tonn CaO/MgO: 60 tonn vann ved temperaturer under 30°C karbondioksyd, idet det faller ut CaCO-j. Ved hjelp av sentrifuger eller filtrering adskilles deretter det utfelte CaCO-j og på denne måte fåes av suspensjonen et filtrat, hvorav det ved oppvarming ved 70 til 80°C med en opp-varmingshastighet på minst 10° pr. minutt faller ut et småplateformet basisk magnesiumkarbonat med høy shape-faktor. Pro- First of all, the dolomite is heated to temperatures of approx. 1000°C, as they avoid carbon dioxide and what remains is a mixture of CaO with MgO. After leskin is introduced into the suspension after dilution to approx. 1 tonne of CaO/MgO: 60 tonnes of water at temperatures below 30°C carbon dioxide, as CaCO-j precipitates out. With the help of centrifuges or filtration, the precipitated CaCO-j is then separated and in this way a filtrate is obtained from the suspension, of which, when heated at 70 to 80°C with a heating rate of at least 10° per minute a small plate-shaped basic magnesium carbonate with a high shape factor falls out. Pro-
duktet kan deretter fåes fra suspensjonen med en mekanisk og/ eller termisk avvanning eller lignende etter tørking. the duct can then be obtained from the suspension with mechanical and/or thermal dewatering or the like after drying.
Patentkrav Patent claims
Fremgangsmåte til fremstilling av en overveiende magnesiumkarbonatholdig, småplateformet kalsium-magnesium-karbonat-blanding med basisk karakter, idet man kalsinerer dolomitt, lesker produktet, suspenderer det i vann, innfører karbondioksyd og frafiltrerer uoppløst kalsiumkarbonat, karakterisert ved at man innstiller suspensjonen på ca. 60 deler vann til én del oksyd, holder suspensjonens temperatur under karbondioksydtilsetningen under 30°C og oppvarmer oppløsningen etter adskillelse av uoppløst kalsiumkarbonat med en oppvarmningshastighet på minst 10°C/min. til temperaturer mellom 70 og 80°C,inntil det basiske magnesiumkarbonat er utfelt. Process for producing a predominantly magnesium carbonate-containing, small plate-shaped calcium-magnesium-carbonate mixture with a basic character, by calcining dolomite, quenching the product, suspending it in water, introducing carbon dioxide and filtering out undissolved calcium carbonate, characterized by setting the suspension at approx. 60 parts water to one part oxide, keeps the temperature of the suspension below 30°C during the carbon dioxide addition and heats the solution after separation of undissolved calcium carbonate at a heating rate of at least 10°C/min. to temperatures between 70 and 80°C, until the basic magnesium carbonate is precipitated.
Claims (1)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752502143 DE2502143A1 (en) | 1975-01-21 | 1975-01-21 | Calcium and magnesium carbonates suitable for paper mfr - made by feeding carbon dioxide into aq suspension of calcined dolomite |
| DE19752502144 DE2502144A1 (en) | 1975-01-21 | 1975-01-21 | Calcium and magnesium carbonates suitable for paper mfr - made by feeding carbon dioxide into aq suspension of calcined dolomite |
| DE19752504062 DE2504062A1 (en) | 1975-01-31 | 1975-01-31 | Calcium and magnesium carbonates suitable for paper mfr - made by feeding carbon dioxide into aq suspension of calcined dolomite |
| DE19762600485 DE2600485A1 (en) | 1976-01-08 | 1976-01-08 | Calcium and magnesium carbonates suitable for paper mfr - made by feeding carbon dioxide into aq suspension of calcined dolomite |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO760148L NO760148L (en) | 1976-07-22 |
| NO141366B true NO141366B (en) | 1979-11-19 |
| NO141366C NO141366C (en) | 1980-02-27 |
Family
ID=27431941
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO760148A NO141366C (en) | 1975-01-21 | 1976-01-16 | PROCEDURE FOR THE PREPARATION OF A CONSIDERABLE MAGNESIUM CARBONATE-CONTAINED, SMALL PLATE-SHARED CALCIUM-MAGNESIUM CARBONATE MIXTURE WITH BASIC CHARACTERISTICS |
| NO792804A NO154315C (en) | 1975-01-21 | 1979-08-29 | PROCEDURE FOR THE PREPARATION OF A STABLE SUSPENSION OF CALCIUM-MAGNESIUM CARBONATE MIXTURE WITH HIGH SOLID CONTENT AND USE OF THE MIXTURE IN THE PREPARATION OF GLOSSY PAPER. |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO792804A NO154315C (en) | 1975-01-21 | 1979-08-29 | PROCEDURE FOR THE PREPARATION OF A STABLE SUSPENSION OF CALCIUM-MAGNESIUM CARBONATE MIXTURE WITH HIGH SOLID CONTENT AND USE OF THE MIXTURE IN THE PREPARATION OF GLOSSY PAPER. |
Country Status (10)
| Country | Link |
|---|---|
| BE (1) | BE837744A (en) |
| CH (1) | CH602488A5 (en) |
| FI (1) | FI62656C (en) |
| FR (1) | FR2298512A1 (en) |
| GB (1) | GB1533323A (en) |
| IT (1) | IT1066074B (en) |
| NL (1) | NL7600557A (en) |
| NO (2) | NO141366C (en) |
| PT (1) | PT64706B (en) |
| SE (1) | SE418607B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0012578B1 (en) * | 1978-12-13 | 1983-06-08 | Monsanto Europe S.A./N.V. | Polymer compositions containing hydrated basic magnesium calcium carbonates as smoke-depressant additives |
| JPS6086067A (en) * | 1983-10-18 | 1985-05-15 | 奥多摩工業株式会社 | Manufacture of plate-like calcium hydroxide |
| US5263500A (en) * | 1991-04-12 | 1993-11-23 | Philip Morris Incorporated | Cigarette and wrapper with controlled puff count |
| US5161551A (en) * | 1991-04-12 | 1992-11-10 | Philip Morris Incorporated | Paper wrapper having improved ash characteristics |
| IT1275889B1 (en) * | 1995-03-10 | 1997-10-24 | L Ind Della Magnesia S P A Soc | MAGNESIA DERIVATIVES PRODUCTION PROCESS |
| ES2141677B1 (en) * | 1998-03-24 | 2000-11-16 | Magnesitas Navarras S A | PROCEDURE FOR THE MANUFACTURE OF BASIC MAGNESIUM CARBONATE FROM NATURAL MATERIALS OR BY-PRODUCTS WITH A CONTENT IN MAGNESIUM. |
| JP4084751B2 (en) * | 2001-10-31 | 2008-04-30 | カウンシル・オブ・サイエンティフィック・アンド・インダストリアル・リサーチ | Method for producing precipitated calcium carbonate from industrial by-products containing high concentrations of calcium carbonate |
| BE1020577A3 (en) | 2012-03-22 | 2014-01-07 | Lhoist Rech & Dev Sa | MINERAL COMPOSITION BASED ON A MIXED SOLID PHASE OF CALCIUM CARBONATES AND MAGNESIUM, PROCESS FOR PREPARING THE SAME AND USE THEREOF |
| CN103738986B (en) * | 2013-12-20 | 2016-03-09 | 周骏宏 | A kind of dolomite calcination water-soluble separating calcium and magnesium produce the method for magnesium hydroxide and calcium carbonate |
| FR3037801B1 (en) * | 2015-06-23 | 2017-08-11 | Jd Invest | PULVERULENT SEMI-SYNTHETIC MATERIAL, OBTAINED BY MODIFICATION OF THE COMPOSITION OF A NATURAL MARINE BIOMATERIAL, ITS MANUFACTURING PROCESS, ITS APPLICATIONS |
-
1976
- 1976-01-16 NO NO760148A patent/NO141366C/en unknown
- 1976-01-16 PT PT64706A patent/PT64706B/en unknown
- 1976-01-19 FI FI760105A patent/FI62656C/en not_active IP Right Cessation
- 1976-01-19 GB GB2053/76A patent/GB1533323A/en not_active Expired
- 1976-01-19 IT IT67117/76A patent/IT1066074B/en active
- 1976-01-20 NL NL7600557A patent/NL7600557A/en not_active Application Discontinuation
- 1976-01-20 SE SE7600550A patent/SE418607B/en unknown
- 1976-01-21 CH CH74176A patent/CH602488A5/xx not_active IP Right Cessation
- 1976-01-21 BE BE2054767A patent/BE837744A/en not_active IP Right Cessation
- 1976-01-21 FR FR7602074A patent/FR2298512A1/en active Granted
-
1979
- 1979-08-29 NO NO792804A patent/NO154315C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NO141366C (en) | 1980-02-27 |
| NO154315B (en) | 1986-05-20 |
| FR2298512B1 (en) | 1981-03-20 |
| SE7600550L (en) | 1976-07-22 |
| BE837744A (en) | 1976-05-14 |
| FR2298512A1 (en) | 1976-08-20 |
| NO154315C (en) | 1986-08-27 |
| FI62656B (en) | 1982-10-29 |
| GB1533323A (en) | 1978-11-22 |
| NL7600557A (en) | 1976-07-23 |
| PT64706B (en) | 1977-08-10 |
| NO760148L (en) | 1976-07-22 |
| IT1066074B (en) | 1985-03-04 |
| PT64706A (en) | 1976-02-01 |
| SE418607B (en) | 1981-06-15 |
| NO792804L (en) | 1976-07-22 |
| FI62656C (en) | 1983-02-10 |
| FI760105A (en) | 1976-07-22 |
| CH602488A5 (en) | 1978-07-31 |
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