GB830660A - A method of precipitating tantalum and/or niobium compounds from ketonic solutions - Google Patents

A method of precipitating tantalum and/or niobium compounds from ketonic solutions

Info

Publication number
GB830660A
GB830660A GB32617/56A GB3261756A GB830660A GB 830660 A GB830660 A GB 830660A GB 32617/56 A GB32617/56 A GB 32617/56A GB 3261756 A GB3261756 A GB 3261756A GB 830660 A GB830660 A GB 830660A
Authority
GB
United Kingdom
Prior art keywords
ketonic
solutions
tantalum
fluoride
niobium
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
GB32617/56A
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.)
ELEKTROMETALLURGIE GmbH
HC Starck GmbH
Original Assignee
ELEKTROMETALLURGIE GmbH
HC Starck GmbH
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 ELEKTROMETALLURGIE GmbH, HC Starck GmbH filed Critical ELEKTROMETALLURGIE GmbH
Publication of GB830660A publication Critical patent/GB830660A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B41M5/132—Chemical colour-forming components; Additives or binders therefor
    • B41M5/136—Organic colour formers, e.g. leuco dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B41M5/132—Chemical colour-forming components; Additives or binders therefor
    • B41M5/136—Organic colour formers, e.g. leuco dyes
    • B41M5/1366—Organic colour formers, e.g. leuco dyes characterised solely by tri (aryl or hetaryl)methane derivatives

Landscapes

  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

Double fluorides of niobium and/or tantalum with potassium are precipitated from ketonic solutions of niobium and/or tantalum fluorides or chlorides, containing respectively hydrofluoric or hydrochloric acids, in the presence of fluoride ions, by the addition of at least one potassium salt (i.e. fluoride or chloride), preferably potassium bifluoride, the salt being necessarily a fluoride if the solution does not already contain fluoride ions. The addition is preferably made in the solid form. A small amount of water, not exceeding 3%, may be added to accelerate precipitation. Specification 830,659 is referred to.
GB32617/56A 1955-10-26 1956-10-25 A method of precipitating tantalum and/or niobium compounds from ketonic solutions Expired GB830660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE830660X 1955-10-26

Publications (1)

Publication Number Publication Date
GB830660A true GB830660A (en) 1960-03-16

Family

ID=6750800

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32617/56A Expired GB830660A (en) 1955-10-26 1956-10-25 A method of precipitating tantalum and/or niobium compounds from ketonic solutions

Country Status (1)

Country Link
GB (1) GB830660A (en)

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