GB651819A - Improvements in or relating to the manufacture of composite calcium sulphate/zinc sulphide pigments - Google Patents

Improvements in or relating to the manufacture of composite calcium sulphate/zinc sulphide pigments

Info

Publication number
GB651819A
GB651819A GB2734748A GB2734748A GB651819A GB 651819 A GB651819 A GB 651819A GB 2734748 A GB2734748 A GB 2734748A GB 2734748 A GB2734748 A GB 2734748A GB 651819 A GB651819 A GB 651819A
Authority
GB
United Kingdom
Prior art keywords
zinc
sulphate
calcium
sulphide
excess
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
GB2734748A
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.)
ORR S ZINC WHITE Ltd
Original Assignee
ORR S ZINC WHITE Ltd
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 ORR S ZINC WHITE Ltd filed Critical ORR S ZINC WHITE Ltd
Priority to GB2734748A priority Critical patent/GB651819A/en
Publication of GB651819A publication Critical patent/GB651819A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/04—Compounds of zinc
    • C09C1/06—Lithopone
    • 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
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)

Abstract

A composite calcium sulphate, zinc sulphide white pigment is prepared by reacting zinc sulphate and calcium hydrosulphide using an excess of soluble zinc, the soluble calcium sulphide being eliminated without the introduction of free sulphuric acid, and then calcining the product. The process may be carried out by adding to the product before calcining a small portion of zinc sulphate followed after a short interval by adding calcium carbonate slurry, zinc sulphate and calcium carbonate additions being continued until the elimination of hydrogen sulphide and free sulphuric acid is complete when a final excess of zinc sulphate solution may be added. This excess may be sufficient to produce a pH of about four while a small amount of cobalt ammonium sulphate may be added to the zinc sulphate. Air may be admitted to the calcining furnace to eliminate calcium sulphide but is kept at a minimum to avoid zinc oxide formation; the calcined product may be quenched with water to form a slurry and sulphuric or other mineral acid added until the slurry reacts acid to an indicating means, preferably methyl orange.
GB2734748A 1948-10-21 1948-10-21 Improvements in or relating to the manufacture of composite calcium sulphate/zinc sulphide pigments Expired GB651819A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2734748A GB651819A (en) 1948-10-21 1948-10-21 Improvements in or relating to the manufacture of composite calcium sulphate/zinc sulphide pigments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2734748A GB651819A (en) 1948-10-21 1948-10-21 Improvements in or relating to the manufacture of composite calcium sulphate/zinc sulphide pigments

Publications (1)

Publication Number Publication Date
GB651819A true GB651819A (en) 1951-04-11

Family

ID=10258110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2734748A Expired GB651819A (en) 1948-10-21 1948-10-21 Improvements in or relating to the manufacture of composite calcium sulphate/zinc sulphide pigments

Country Status (1)

Country Link
GB (1) GB651819A (en)

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