GB883476A - Process for the production of finely divided particles of silica - Google Patents

Process for the production of finely divided particles of silica

Info

Publication number
GB883476A
GB883476A GB34812/58A GB3481258A GB883476A GB 883476 A GB883476 A GB 883476A GB 34812/58 A GB34812/58 A GB 34812/58A GB 3481258 A GB3481258 A GB 3481258A GB 883476 A GB883476 A GB 883476A
Authority
GB
United Kingdom
Prior art keywords
resin
silica
slurry
sio2
separated
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB34812/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Columbia Southern Chemical Corp
Original Assignee
Columbia Southern Chemical Corp
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 Columbia Southern Chemical Corp filed Critical Columbia Southern Chemical Corp
Publication of GB883476A publication Critical patent/GB883476A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
    • C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • 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
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Compounds Of Unknown Constitution (AREA)

Abstract

Acid-precipitated, finely-divided, filterable silica containing cationic impurities is purified by adding a small amount, e.g. 0,02 to 0,5 grms/litre, of a metal or ammonium salt to an aqueous slurry of the silica and treating the slurry with an ion exchange resin, preferably in amount sufficient to reduce the pH of the slurry to below 6, e.g. 2-4. Salts may be K2SO4, KNO3, KBr, NaNO3, Na2SO4, NaCl, Na oxalate, Na acetate, NH4Cl, (NH4)2SO4, BaCl2, BaSO4, CaSO4, CaCl2, AlCl3, AlF3, Al2(SO4)3, Al acetate, MgSO4, MgCl2, or MgBr2. The silica may be prepared from alkali metal silicate and at least a stoichiometric amount of a weak acid having a dissociation constant below 1 X 10-4 for the first H and gaseous in the anhydrous state, e.g. CO2, SO2, or H2S. The precipitated SiO2 flocs, having a surface area 25-400 sq. m./grm., and actual particle size 0,1-10m , and containing at least 90% SiO2 on the anhydrous basis, are filtered off and washed to yield a filter cake containing 12-20% solids. This filter cake after addition of the salt, is mixed with granular, e.g. 10-100 mesh, iron exchange resin, in amount at least 1 lb. resin/lb. SiO2 and water, if necessary, to maintain not less than 12% SiO2 in the slurry. Resins may be sulphonated polystyrene, styrene-vinyl benzene copolymer, phenol-formaldehyde resin, lignin, or peat, or amino resins. The mixture of slurry and resin is allowed to stand with agitation, and the resin is separated by settling, decantation, or centrifuging, or a combination of these separations. Preferably, a portion of the silica slurry is separated from the resin and then the remainder, e.g. 0,25-25%, is separated. The silica may be stabilized before the resin treatment by heating in an aqueous medium at above 60 DEG C. for at least 30 mins., or by drying at 100 DEG C. or above, e.g. 120 DEG -300 DEG C. for 10 secs.-25 mins. and then redispersing. Specification 774,586 is referred to.
GB34812/58A 1957-11-01 1958-10-30 Process for the production of finely divided particles of silica Expired GB883476A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US883476XA 1957-11-01 1957-11-01

Publications (1)

Publication Number Publication Date
GB883476A true GB883476A (en) 1961-11-29

Family

ID=22210846

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34812/58A Expired GB883476A (en) 1957-11-01 1958-10-30 Process for the production of finely divided particles of silica

Country Status (1)

Country Link
GB (1) GB883476A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004048264A2 (en) * 2002-11-27 2004-06-10 Idntaeknistofnun Islands A process for production of silica from olivine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004048264A2 (en) * 2002-11-27 2004-06-10 Idntaeknistofnun Islands A process for production of silica from olivine
WO2004048264A3 (en) * 2002-11-27 2004-08-26 Idntaeknistofnun Islands A process for production of silica from olivine
US8110166B2 (en) 2002-11-27 2012-02-07 Silmag Da Process for producing silica from olivine

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