GB909960A - Processes for preparing refined silica - Google Patents

Processes for preparing refined silica

Info

Publication number
GB909960A
GB909960A GB3736760A GB3736760A GB909960A GB 909960 A GB909960 A GB 909960A GB 3736760 A GB3736760 A GB 3736760A GB 3736760 A GB3736760 A GB 3736760A GB 909960 A GB909960 A GB 909960A
Authority
GB
United Kingdom
Prior art keywords
silica
fluosilicic acid
stage
solution
batch
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
GB3736760A
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.)
Nobel Bozel SA
Original Assignee
Nobel Bozel SA
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 Nobel Bozel SA filed Critical Nobel Bozel SA
Publication of GB909960A publication Critical patent/GB909960A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C01B33/186—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof from or via fluosilicic acid or salts thereof by a wet process
    • 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
    • C01P2006/12—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
    • C01P2006/80—Compositional purity
    • 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
    • C01P2006/80—Compositional purity
    • C01P2006/82—Compositional purity water content
    • 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
    • C01P2006/90—Other properties not specified above

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicon Compounds (AREA)

Abstract

Pure, fine grained silica is produced by reacting impure and coarse silica, e.g. sand, with a boiling aqueous solution of fluosilicic acid to produce water, and silicon tetrafluoride which is then hydrolysed by another solution containing fluosilicic acid, which may be at 40 DEG -80 DEG C., to precipitate pure fine silica. The fluosilicic acid content of the solutions may be from 20 to 60% by weight and the solution may contain sufficient silica dissolved to saturate the solution when at the temperature of stage 2. The residual solution from the first stage may be used as the solution in the second stage. The impure silica stock before treatment is ground or screened preferably to pass a screen of mesh size 0,15 to 0,06 mm. The silica precipitate is separated by filtration and may be washed with water to recover fluosilicic acid which is then recycled. Alternatively, the silica may be drained and dried at 100 DEG -300 DEG C. to remove fluosilic acid as silicon tetrafluoride, which is recycled. A batch process is described in which, after treatment of one batch of sand, the aqueous fluosilicic acid used for the hydrolysis step is used in the first stage of treatment of a second batch, and the aqueous fluosilicic acid used for the first stage is used in the hydrolysis step of the second batch. A continuous process is also described in which aqueous fluosilicic acid is circulated between the first and second stages, with intermediate filtering.ALSO:Ultra-fine silica, which may have a specific surface area of 250 sq. m./g., is used as a reinforcing filler in smoked sheet rubber material. It may be used in the proportion 55 parts by weight silica per 100 parts rubber, and cured at 143 DEG C. for 15 minutes.
GB3736760A 1958-11-03 1960-10-31 Processes for preparing refined silica Expired GB909960A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR809187 1958-11-03

Publications (1)

Publication Number Publication Date
GB909960A true GB909960A (en) 1962-11-07

Family

ID=8720843

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3736760A Expired GB909960A (en) 1958-11-03 1960-10-31 Processes for preparing refined silica

Country Status (1)

Country Link
GB (1) GB909960A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003072501A1 (en) * 2002-02-26 2003-09-04 Ati-Aluminum Technologies Israel Ltd. Process for the preparation of pure silica

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003072501A1 (en) * 2002-02-26 2003-09-04 Ati-Aluminum Technologies Israel Ltd. Process for the preparation of pure silica
US7534411B2 (en) * 2002-02-26 2009-05-19 Sti Silicon Technologies Israel Ltd. Process for the preparation of pure silica

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