WO1999008962A1 - BROYAGE HUMIDE D'UNE BOUE DE Mg(OH)¿2? - Google Patents

BROYAGE HUMIDE D'UNE BOUE DE Mg(OH)¿2? Download PDF

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Publication number
WO1999008962A1
WO1999008962A1 PCT/US1998/017212 US9817212W WO9908962A1 WO 1999008962 A1 WO1999008962 A1 WO 1999008962A1 US 9817212 W US9817212 W US 9817212W WO 9908962 A1 WO9908962 A1 WO 9908962A1
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WO
WIPO (PCT)
Prior art keywords
magnesium hydroxide
hydroxide slurry
slurry
stabilized
particle size
Prior art date
Application number
PCT/US1998/017212
Other languages
English (en)
Inventor
Robert J. Gutowski
Alvin Richmond
Original Assignee
Martin Marietta Magnesia Specialties, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Martin Marietta Magnesia Specialties, Inc. filed Critical Martin Marietta Magnesia Specialties, Inc.
Priority to CA002300947A priority Critical patent/CA2300947A1/fr
Priority to AU91087/98A priority patent/AU9108798A/en
Priority to EP98943256A priority patent/EP1009717A4/fr
Publication of WO1999008962A1 publication Critical patent/WO1999008962A1/fr

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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
    • C01F5/02—Magnesia
    • C01F5/06—Magnesia by thermal decomposition of magnesium compounds
    • C01F5/08—Magnesia by thermal decomposition of magnesium compounds by calcining magnesium hydroxide
    • 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
    • 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
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 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
    • C01P2006/10—Solid density
    • 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
    • C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability

Definitions

  • the present invention relates to a method for producing a stabilized magnesium hydroxide slurry that involves wet milling a starting magnesium hydroxide slurry.
  • the present invention also relates to a stabilized magnesium hydroxide slurry produced by the wet milling method, dry magnesia-hydroxide and magnesia-based products produced using the wet milled magnesium hydroxide slurry of the invention.
  • the invention is particularly useful for the production of particulate magnesium hydroxide suitable for use as a flame retardant additive.
  • Magnesium hydroxide, Mg(OH) 2 is useful in various chemical processes, including, but not limited to, the following: pH adjustment; precipitation of heavy metal contaminants; scrubbing and neutralization of acidic vapors such as those associated with flue gases or process off-gases; and production of specialty magnesium compounds such as particulate Mg(OH) 2 , chemical grade magnesia, high reactivity MgO of various activities, periclase and so forth.
  • Particulate magnesium hydroxide with a median particle size of between about 0.5-5 um and surface area, as measured by gas absorption methods, of 4-25 m 2 /g.
  • Particulate magnesium hydroxide is used, for example, as a flame retardant additive, due to its ability to endothermically decompose with the release of water and its environmentally attractive nature. It is also particularly desirable to develop economic routes to achieve such a particulate magnesium hydroxide.
  • a base such as ammonium, sodium or calcium hydroxide
  • a magnesium salt such as ammonium, sodium or calcium hydroxide
  • magnesium hydroxide powders with a particle size (D 50 ) of 0.5-1.5 microns can be obtained. These powders have a BET surface area in the range 3-10 m 2 /g and are effective flame retardant additives.
  • such powders are relatively expensive to produce, since extensive washing of the precipitate is required to remove co-product (ammonium, sodium or calcium salt).
  • magnesium oxide produced by calcination of magnesium hydroxide or magnesium carbonate is potentially attractive as there is no by-product to remove.
  • the degree of calcination used determines the surface area of magnesium hydroxide powder. Mild calcination gives magnesium oxide with a BET surface area of at least 25 m 2 /g (often >50 m 2 /g). Such magnesium oxide hydrates easily but gives a magnesium hydroxide powder with a similarly high BET surface area. Hard calcination gives a magnesium oxide with a large particle size (D 50 ) and a low BET surface area (often ⁇ 1 m 2 /g). This magnesium oxide is extremely difficult to hydrate unless a catalyst such as magnesium chloride is used. When a catalyst is used, the product usually comprises particles of relatively large particle size (D 50 ) and high BET surface area.
  • magnesium hydroxide slurries represent an effective and convenient form by which magnesium hydroxide can be furnished.
  • stabilized slurries of magnesium hydroxide have many advantages over other forms of magnesium hydroxide, including the ability to be easily handled, transferred and stored, and the ability to be reliably dosed to chemical processes as desired.
  • Magnesium hydroxide slurry may typically be derived from three basic sources: seawater, well brine and magnesite ore.
  • a magnesium hydroxide slurry is produced from the chemical reaction of dolime (CaO-MgO) and well brine.
  • the well brine comprises primarily calcium chloride but also includes magnesium chloride.
  • the chemical reaction of dolime and well brine produces a slurry of magnesium hydroxide in a chloride-containing liquor.
  • the slurry is then further processed to increase solids content, typically to between about 30% and 60%. Unless indicated otherwise, all percentages in this application are weight percentages on an MgO basis.
  • Richmond et al., U.S. Patent No. 5,514,357 discloses a method for producing a stabilized magnesium hydroxide slurry produced by conventional methods such as from well brine consisting of physically deflocculating the magnesium hydroxide solids in a starting slurry and optionally adding a cationic polymer and a thickening agent.
  • Richmond et al., U.S. Patent No. 5,762,901 discloses a method for producing a stabilized magnesium hydroxide slurry consisting of physically deflocculating the magnesium hydroxide solids in a starting slurry and controlling the chloride ion content in the slurry. Witkowski et al., U.S. Patent No.
  • 5,487,879 discloses a process for producing a stabilized slurry of magnesium hydroxide from burnt natural magnesite that invok es pressure hydrating a mixture containing burnt natural magnesite and water in the presence of chloride ions and cationic polymer.
  • the present invention permits the production of Mg(OH) 2 and MgO products that could not readily and economically be produced with conventional methods. These products include those that require submicron Mg(OH) 2 and MgO particle sizes, specified (e.g., high) surface area of Mg(OH) 2 and MgO, and specified (e.g., very high) density of Mg(OH) 2 and MgO. Summary of the Invention
  • an object of the present invention to provide a method for producing a stabilized magnesium hydroxide slurry having specified properties pursuant to the needs of the characteristics of the final slurry and/or of the final Mg(OH) 2 /MgO product.
  • the present invention is thus directed to a method for producing a stabilized magnesium hydroxide slurry, the stabilized magnesium hydroxide slurry produced by the method and magnesia-based products produced using the stabilized magnesium hydroxide slurry of the invention.
  • a wet milled magnesium hydroxide slurry produced by conventional methods such as from well brine, having a desired solids content, i.e., generally between about 30-80% solids, by weight (MgO basis), and viscosity of about 50-1000 cps; median particle size ranging from about 0.5-7 um; range of particle sizes from about ⁇ 0.1-30 um; and specific surface area of from about 5-25 m 2 /g, is subjected to wet milling to produce a stabilized magnesium hydroxide slurry having specified characteristics, such as viscosity of Mg(OH) 2 slurry, as well as median particle size, particle size range and surface area of Mg(OH) 2 solids.
  • Wet milling which may be carried out by a variety of procedures and equipment, refers to a process wherein the solid magnesium hydroxide particles in the slurry are ground using energy developed by particle to particle interactions, media to particle interactions, particle to grinding chamber interactions and shear forces.
  • the method of the present invention advantageously produces a stabilized magnesium hydroxide slurry having specified characteristics that can be further processed to various magnesia-based products.
  • the stabilized magnesium hydroxide slurry of the invention is, in particular, characterized by its controlled viscosity of the Mg(OH) 2 slurry, as well as by the controlled median particle size, controlled particle size range, and controlled surface area (which is indirectly controlled based on degree of particle size reduction), of Mg(OH) 2 solids.
  • the stabilized magnesium hydroxide slurry of the invention has the aforementioned advantages as well as other advantages that will be apparent to those of ordinary skill in the art from the following more detailed description, taken in conjunction with the accompanying drawings. Brief Description of the Drawings
  • FIG. 1 is a schematic showing the method for preparing a stabilized magnesium hydroxide slurry involving wet milling a starting magnesium hydroxide slurry of the present invention.
  • the media, the mill speed and the throughput may be controlled to yield a desired product.
  • FIG. 2 is a graph showing viscosity v. particle size for the (a) unmilled magnesium hydroxide slurry and (b) wet milled magnesium hydroxide slurry of Example 1 , showing milling to various particle sizes.
  • FIGS. 3 and 4 are charts showing cumulative mass percent v. finer for the wet milled magnesium hydroxide slurries of Example 9.
  • the wet milling process of the invention advances over the conventional processes for making Mg(OH) 2 slurry.
  • the process of the invention permits more rapid, less complicated processing of Mg(OH) 2 slurry.
  • the process of the invention also advances over the conventional processes for making Mg(OH) 2 and MgO products and, in particular, for making particulate Mg(OH) 2 .
  • the process of the invention permits more rapid, less complicated production of particulate Mg(OH) 2 .
  • the method of the present invention for producing a stabilized magnesium hydroxide slurry using wet milling comprises passing a magnesium hydroxide slurry through a wet milling apparatus one time.
  • the rate (residence time) is controlled, the media type and quality are selected and the media circulation rate is controlled. All of these variables impact the degree of milling of the Mg(OH) 2 particles in the stabilized magnesium hydroxide slurry.
  • a stabilized magnesium hydroxide slurry having specified characteristics such as a specified viscosity of Mg(OH) 2 slurry, specified median particle size, specified particle size range, specified particle size distribution and a specified surface area of Mg(OH) 2 solids.
  • the method of the invention thus allows the production of a stabilized magnesium hydroxide slurry, as well as of Mg(OH) 2 and MgO products, having specified characteristics.
  • Washed magnesium hydroxide slurry is either (a) fed directly to a wet mill 1 at a controlled rate for particle size reduction, or (b) introduced to a disk filter 2 to increase percent solids to greater than about 60%.
  • the discharge is directed to a pug mill 3.
  • a pump 6 is used to withdraw slurry from the surge tank 5 and feed the wet mill 1 at a controlled rate which dictates residence time in the wet mill 1. This rate can be altered to control particle size reduction.
  • the easiest ways to control particle size is throughput control and recirculation rate control.
  • the milled slurry is collected in a storage tank 6.
  • the milled slurry is suitable as a stabilized slurry, and for drying to particulate Mg(OH) 2 , calcining to MgO, or calcining and sintering for production of periclase.
  • the different final applications require particle size control to varying levels.
  • stabilized slurry generally requires median particle size of about 1 - 4.5 um
  • dry (particulate) Mg(OH) 2 generally requires median particle size of about 0.5 - 1 um, 1.5 - 2.0 um
  • high activity MgO generally requires a median particle size of about 0.7 - 1.0 um or unmilled
  • periclase pressing enhancement of about ⁇ 1 um - 4 um
  • the stabilized magnesium hydroxide slurry of the present invention comprises median particle sizes of Mg(OH) 2 solids not easily achieved by conventional methods. For example:
  • a magnesium hydroxide slurry containing Mg(OH) 2 with median particle size of Mg(OH) 2 solids greater than 3 microns and less than 10 microns produced from dolime and well brine can quite easily be wet milled to achieve a stabilized magnesium hydroxide slurry containing Mg(OH) 2 with a median particle size of less than 0.5-6 microns, as desired.
  • Wet milling conditions can successfully be altered to produce any median particle size desired that is less than the starting median particle size.
  • particulate Mg(OH) 2 with a median particle size less than 1 micron can successfully and economically be produced by wet milling the magnesium hydroxide slurry and then drying.
  • particulate Mg(OH) 2 is used in, for example, plastics and rubber compounds, and as filler in, e.g., wire and cable coatings, etc.
  • the stabilized magnesium hydroxide slurry of the invention can be used to prepare lightly burnt MgO (i.e., Chemical Grade Magnesia) - Applications exist where customers desire sub-micron particle size magnesia. This product is currently produced by jet milling the MgO powder, which is energy intensive and very costly. Wet milling the Mg(OH) 2 slurry prior to calcination to sub-micron size enables production of sub-micron chemical grade magnesia directly off the calcination furnace.
  • MgO Chemical Grade Magnesia
  • the magnesium hydroxide slurry of the invention is first calcined to MgO powder similar to that described above. Secondly, the MgO powder is pressed into almond shaped briquettes (green briquettes). These briquettes are then fed into a high temperature shaft kiln for final heat treatment and production of high density MgO. It has been discovered that wet milling the Mg(OH) 2 slurry prior to calcination to less than 4 microns improves the pressing characteristics of the powder.
  • the benefits include: a) the green briquette breaking strength is greatly increased, b) the density of the green briquette is higher, c) costs to produce green briquettes are less because of higher yield of good briquettes during pressing (less breakage), and d) the MgO powder can be calcined to a lesser degree, reducing operating costs, while still producing high quality green briquettes.
  • BSG Bulk Specific Gravity
  • Rotary kiln operations which produce MgO from Mg(OH) 2 slurry, can be improved by employing wet milling of a starting slurry. Product sizing control and enhanced BSG's may be obtained. In terms of heat treatment, the rotary kiln produces MgO burnt harder than the calcining furnace and lighter than that burnt on the shaft kilns. Operating costs may thus be reduced.
  • wet milling is a tool that enables enhanced "custom tailoring" of the starting slurry beyond conventional methods. Wet milling can enable significant advances in product quality while at the same time reduce operating costs.
  • Example 1 The present invention will be further illustrated by the following non-limiting Examples.
  • the Examples are illustrative and do not limit the claimed invention to the particular materials, conditions, process parameters and the like recited herein.
  • Example 1
  • a starting magnesium hydroxide slurry "(98 HP)" was taken from a raw feed surge tank. The chemistry, particle size, specific surface area, percent solids and viscosity are indicated in Table 1 (below). This slurry contained 500 ppm of Betz 1195 (cationic coagulant) and was initially deflocculated with a disk filter pug mill and Silverson high shear mixer prior to storage in the tank and wet milling.
  • the typical process sequence in stabilized magnesium hydroxide production is similar to that disclosed in U.S. Patents Nos. 5,514,357 and 5,762,901 and U.S. Patent Applications Serial Nos. 08/853,412 and 08/968,135, the entire contents of which are incorporated herein by reference.
  • particle size reduction with wet milling was 2 um greater than with conventional processes (median particle size fell at least 2 microns versus 1 micron or less, breakage of particles was determined by x-ray monitored sedimentation (Micromeritics Co., GA), wherein a sample is dispersed in liquid; x-ray beams are radiated through the liquid; and as the particles settle, a measurement of how readily the particles settle is determined).
  • GA x-ray monitored sedimentation
  • the % drainage is an adequate measure for assessing the stability of a slurry.
  • a sample after a given settling period is determined based on the pourability of a sample after a given settling period.
  • a pre-weighed 5 W high x 2" diameter high density polyethylene sample bottle with cap available from Cole Parmer, is filled with slurry to capacity. After a given period of unagitated storage at room temperature, the cap is removed, a glass stirring rod is inserted to the bottom of the bottle, and the end is slowly rotated one turn around the inner periphery of the bottle. The bottle is then weighed, inverted 180° for a period of 15 seconds, reweighed, and percent drainage calculated as follows:
  • % drainage (f ⁇ lled bottle weight - drained bottle weight) x 100 (filled bottle weight - bottle weight)
  • the solids remaining in the bottle are then probed with a stirring rod to determine whether they are soft, tacky (e.g., like bubblegum) or hard.
  • a slurry is deemed to have "long term stability" if it has a percent drainage of at least 90%o after 7 days, at least 85%) after 14 days and at least 80% after 28 days.
  • the present inventors have also surprisingly discovered that the stabilized Mg(OH) 2 slurry prepared according to the invention (as exhibited by Example 1) may be frozen and then thawed, while retaining stability. This was demonstrated by taking a sample of frozen slurry, allowing to thaw, and determining stability as above. 7-day drainage results showed stability to be 88%-92%, without tacky sedimentation. This is in contrast to the characteristics of conventional slurries, which lose stability upon freezing and thawing.
  • Example 2
  • Table 3 shows results of stabilized slurry production.
  • Particle size target was 3-4 um, which was 1.5-2 um less than the starting particle size of the slurry. Viscosity was improved versus the unmilled slurry. The unmilled slurry was prepared using disk filter, addition of cationic coagulant and Silverson. Results indicate that essentially all +100 mesh and +325 mesh particles were eliminated (i.e., 145 um and 44 um, respectively).
  • Table 4 shows results comparing the conventional (i.e., use of a Gaulin) process for production of stabilized slurry to the wet milling method. The results indicate superior reduction of the coarse agglomerates (+100 mesh and +325 mesh), with wet milling.
  • Table 5 shows additional results for particle size and distribution for stabilized slurry produced via wet milling. A 270 mesh screen (55 um) was added in this evaluation.
  • Example 6
  • Tables 8 and 9 show results of a trial to enhance the pressing characteristics of MgO powder by wet milling the starting Mg(OH) 2 prior to calcination to 1.56 um. Results were compared to unmilled Mg(OH) 2 . Both starting slurries were calcined identically, as indicated by activity test and surface area. The wet milled sample showed enhanced compaction strength, 66 psi, versus 26 psi for the unmilled sample.
  • Table 10 show that wet milling breaks particles. This conclusion is drawn based on the fact that particle size is reduced and surface area is increased.
  • Tables 11 and 12 show another example of production of sub-micron high reactivity MgO by wet milling Mg(OH) 2 slurry prior to calcination. An unmilled slurry was used as a comparison. Tables 11 and 12 also demonstrate significant improvement in the pressing characteristics of MgO produced from wet milled slurry, which is evidenced in the higher MgO compaction values versus the unmilled. This is in contrast to existing Mg(OH) 2 slurry production, wherein, only deflocculation occurs, i.e., apparent particle size falls, but surface area does not change.
  • Example 9
  • Tables 13 and 14 and FIGS. 3 and 4, respectively, show particle size analyses of sub-micron wet milled Mg(OH) 2 .
  • the starting slurry contained 50 ppm Betz 1 195 and was initially r m deflocculated with a disk filter pug mill and Silverson high shear mixer. r
  • AH wet milled slurry samples had median diameters less than 1.5 um.
  • SAMPLE ID 98HP 8 1 H 6REP SV-4 UNIT NUMBER: 1
  • SAMPLE TYPE HYDROXIDE START 13:50:57 LIQUID TYPE: SEDISPERSE A-11 REPORT 14:28:15 TOT RUN TIME 0:37:06
  • SAM DENS 2.3800 g/cc LIQ DENS: 0.7450 g/cc

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

L'invention concerne un procédé de production d'une boue d'hydroxyde de magnésium stabilisée consistant à procéder au broyage humide d'une boue d'hydroxyde de magnésium de départ. L'invention concerne également une boue d'hydroxyde de magnésium stabilisée produite selon le procédé ainsi que des produits à base de magnésie produits à partir de la boue d'hydroxyde de magnésium broyée humide. La boue d'hydroxyde de magnésium lavée est soit (a) acheminée directement vers un broyeur humide (1) à un un débit régulé pour la réduction de la grosseur de particules, soit (b) introduite dans un filtre (2) à disque afin d'augmenter le pourcentage de solides à plus d'environ 60 %. Si le filtre (2) à disque est utilisé, la décharge est dirigée vers un broyeur (3) à hélice. Le flux est recyclé dans le broyeur (3) à hélice par l'intermédiaire d'un mélangeur (4) à cisaillement élevé. La matière déchargée du broyeur à hélice est collectée dans un réservoir de purge (5). Une pompe (6) est utilisée pour retirer la boue du réservoir d'équilibrage (5) et pour alimenter le broyeur humide (1) à un débit régulé, lequel débit dicte le temps de séjour dans le broyeur humide (1). Ce débit peut être modifié afin de réguler la réduction de la grosseur des particules. La boue broyée est collectée dans un réservoir de stockage (7).
PCT/US1998/017212 1997-08-20 1998-08-20 BROYAGE HUMIDE D'UNE BOUE DE Mg(OH)¿2? WO1999008962A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002300947A CA2300947A1 (fr) 1997-08-20 1998-08-20 Broyage humide d'une boue de mg(oh)2
AU91087/98A AU9108798A (en) 1997-08-20 1998-08-20 Wet milling of mg(oh)2 slurry
EP98943256A EP1009717A4 (fr) 1997-08-20 1998-08-20 BROYAGE HUMIDE D'UNE BOUE DE Mg(OH) 2?

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US5609497P 1997-08-20 1997-08-20
US60/056,094 1997-08-20
US7174898P 1998-01-16 1998-01-16
US60/071,748 1998-01-16

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Publication Number Publication Date
WO1999008962A1 true WO1999008962A1 (fr) 1999-02-25

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PCT/US1998/017212 WO1999008962A1 (fr) 1997-08-20 1998-08-20 BROYAGE HUMIDE D'UNE BOUE DE Mg(OH)¿2?

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EP (1) EP1009717A4 (fr)
AU (1) AU9108798A (fr)
CA (1) CA2300947A1 (fr)
WO (1) WO1999008962A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100334026C (zh) * 2005-11-18 2007-08-29 东北大学 一种活性氧化镁的制备方法
WO2007117841A2 (fr) * 2006-03-31 2007-10-18 Albemarle Corporation Hydroxyde de magnésium à performances de compoundage et de viscosité améliorées
WO2007117840A2 (fr) * 2006-03-31 2007-10-18 Albemarle Corporation Hydroxyde de magnésium comprenant des performances améliorées de mélange et de viscosité
EP2141124A1 (fr) 2008-07-04 2010-01-06 K+S Aktiengesellschaft Procédé de fabrication de particules d'hydroxyde de magnésium à grosse échelle et/ou, nano-échelle, revêtues, désagglomérées
DE102008031360A1 (de) 2008-07-04 2010-01-14 K+S Ag Verfahren zum Herstellen von aushärtbaren Massen, enthaltend grob- und/oder nanoskalige, gecoatete, desagglomerierte und bevorzugt funktionalisierte Magnesiumhydroxidpartikel, sowie von ausgehärteten thermoplastischen oder duroplastischen Polymeren bzw. Kompositen, enthaltend desagglomerierte und homogen verteilte Magnesiumhydroxidfüllstoffpartikel
EP1381567B2 (fr) † 2001-04-19 2013-11-06 Clariant Produkte (Deutschland) GmbH Procede de production d'hydrotalcites
WO2015058236A1 (fr) * 2013-10-24 2015-04-30 Calix Ltd Procédé et appareil de production d'une suspension d'hydroxyde
JP2016003174A (ja) * 2014-06-18 2016-01-12 神島化学工業株式会社 高活性な酸化マグネシウム系添加剤、及びその用途
JP2016008151A (ja) * 2014-06-24 2016-01-18 神島化学工業株式会社 酸化マグネシウム系添加剤、及びその用途
CN111439766A (zh) * 2020-04-15 2020-07-24 山东格润德环保科技有限公司 一种通过氧化镁水化制备氢氧化镁悬浮液的方法
CN115212713A (zh) * 2022-05-30 2022-10-21 湖北工业大学 一种水泥厂湿磨窑灰固碳减排的方法
US11939430B2 (en) 2020-04-24 2024-03-26 J.M. Huber Corporation Methods for the continuous polymerization of phosphate compounds to form polyphosphate compositions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487879A (en) * 1994-07-15 1996-01-30 Martin Marietta Magnesia Specialities Inc. Stabilized, pressure-hydrated magnesium hydroxide slurry from burnt magnesite and process for its production
US5514357A (en) * 1993-04-15 1996-05-07 Martin Marietta Magnesia Specialties Inc. Stabilized magnesium hydroxide slurry

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB580367A (en) * 1943-11-12 1946-09-05 Marine Magnesium Products Corp Process for manufacture of magnesium products
GB2076788A (en) * 1980-05-30 1981-12-09 Steetley Refractories Ltd Grate Calcination of Mg(OH)2
ATE139981T1 (de) * 1990-11-21 1996-07-15 Lhoist Rech & Dev Sa Kalzium- und/oder magnesiumhydroxid, verfahren zu dessen herstellung und dessen anwendung
IE921328A1 (en) * 1992-04-23 1993-11-03 Defped Ltd Particulate magnesium hydroxide
JPH0881216A (ja) * 1994-09-09 1996-03-26 Daicel Amiboshi Sangyo Kk 水酸化マグネシウム水懸濁液及びその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5514357A (en) * 1993-04-15 1996-05-07 Martin Marietta Magnesia Specialties Inc. Stabilized magnesium hydroxide slurry
US5487879A (en) * 1994-07-15 1996-01-30 Martin Marietta Magnesia Specialities Inc. Stabilized, pressure-hydrated magnesium hydroxide slurry from burnt magnesite and process for its production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1009717A4 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1381567B2 (fr) † 2001-04-19 2013-11-06 Clariant Produkte (Deutschland) GmbH Procede de production d'hydrotalcites
CN100334026C (zh) * 2005-11-18 2007-08-29 东北大学 一种活性氧化镁的制备方法
WO2007117840A3 (fr) * 2006-03-31 2007-12-13 Albemarle Corp Hydroxyde de magnésium comprenant des performances améliorées de mélange et de viscosité
WO2007117841A3 (fr) * 2006-03-31 2007-12-06 Albemarle Corp Hydroxyde de magnésium à performances de compoundage et de viscosité améliorées
WO2007117840A2 (fr) * 2006-03-31 2007-10-18 Albemarle Corporation Hydroxyde de magnésium comprenant des performances améliorées de mélange et de viscosité
WO2007117841A2 (fr) * 2006-03-31 2007-10-18 Albemarle Corporation Hydroxyde de magnésium à performances de compoundage et de viscosité améliorées
EP2141124A1 (fr) 2008-07-04 2010-01-06 K+S Aktiengesellschaft Procédé de fabrication de particules d'hydroxyde de magnésium à grosse échelle et/ou, nano-échelle, revêtues, désagglomérées
DE102008031361A1 (de) 2008-07-04 2010-01-14 K+S Aktiengesellschaft Verfahren zur Herstellung von grob- und/oder nanoskaligen, gecoateten, desagglomerierten Magnesiumhydroxiparikeln
DE102008031360A1 (de) 2008-07-04 2010-01-14 K+S Ag Verfahren zum Herstellen von aushärtbaren Massen, enthaltend grob- und/oder nanoskalige, gecoatete, desagglomerierte und bevorzugt funktionalisierte Magnesiumhydroxidpartikel, sowie von ausgehärteten thermoplastischen oder duroplastischen Polymeren bzw. Kompositen, enthaltend desagglomerierte und homogen verteilte Magnesiumhydroxidfüllstoffpartikel
US11401183B2 (en) 2013-10-24 2022-08-02 Calix Ltd Process for manufacture of hydroxide slurry
US10358364B2 (en) 2013-10-24 2019-07-23 Calix Ltd Process and apparatus for manufacture of hydroxide slurry
US10800683B2 (en) 2013-10-24 2020-10-13 Calix Ltd Process for manufacture of hydroxide slurry
WO2015058236A1 (fr) * 2013-10-24 2015-04-30 Calix Ltd Procédé et appareil de production d'une suspension d'hydroxyde
JP2016003174A (ja) * 2014-06-18 2016-01-12 神島化学工業株式会社 高活性な酸化マグネシウム系添加剤、及びその用途
JP2016008151A (ja) * 2014-06-24 2016-01-18 神島化学工業株式会社 酸化マグネシウム系添加剤、及びその用途
CN111439766A (zh) * 2020-04-15 2020-07-24 山东格润德环保科技有限公司 一种通过氧化镁水化制备氢氧化镁悬浮液的方法
US11939430B2 (en) 2020-04-24 2024-03-26 J.M. Huber Corporation Methods for the continuous polymerization of phosphate compounds to form polyphosphate compositions
CN115212713A (zh) * 2022-05-30 2022-10-21 湖北工业大学 一种水泥厂湿磨窑灰固碳减排的方法
CN115212713B (zh) * 2022-05-30 2024-03-26 湖北工业大学 一种水泥厂湿磨窑灰固碳减排的方法

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EP1009717A1 (fr) 2000-06-21

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