FR2095447A5 - Bleaching minerals - using powdered zinc and sulphur dioxide - Google Patents

Bleaching minerals - using powdered zinc and sulphur dioxide

Info

Publication number
FR2095447A5
FR2095447A5 FR7042546A FR7042546A FR2095447A5 FR 2095447 A5 FR2095447 A5 FR 2095447A5 FR 7042546 A FR7042546 A FR 7042546A FR 7042546 A FR7042546 A FR 7042546A FR 2095447 A5 FR2095447 A5 FR 2095447A5
Authority
FR
France
Prior art keywords
sulphur dioxide
minerals
powdered zinc
bleaching
bleaching minerals
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
FR7042546A
Other languages
French (fr)
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.)
Engelhard Minerals and Chemicals Corp
Original Assignee
Engelhard Minerals and Chemicals 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 Engelhard Minerals and Chemicals Corp filed Critical Engelhard Minerals and Chemicals Corp
Application granted granted Critical
Publication of FR2095447A5 publication Critical patent/FR2095447A5/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/10—Eliminating iron or lime
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/04—Clay; Kaolin
    • C04B33/06—Rendering lime harmless
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/30—Drying methods

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Cosmetics (AREA)
  • Detergent Compositions (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)

Abstract

A paste of the discoloured minerals e.g. kaolin, clays, barytes, glass-silica, which is stable to acids, is mixed with H2HSO4 to pH 5 - 7 and placed in an enclosed reator. Finely divided Zn and excess SO2 (to that for ZnS2O4) are introduced and the treatment effected in the absence of O2, while maintaining pH is not >4. Zn is used as not >0.1 wt. % (w.r.t. dry mineral) and a wt. ratio Zn : SO2 of 1 : 3 - 8. Slightly improved whitness is obtained than with prior methods, using considerably less reductant.
FR7042546A 1970-06-04 1970-11-26 Bleaching minerals - using powdered zinc and sulphur dioxide Expired FR2095447A5 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4359070A 1970-06-04 1970-06-04

Publications (1)

Publication Number Publication Date
FR2095447A5 true FR2095447A5 (en) 1972-02-11

Family

ID=21927942

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7042546A Expired FR2095447A5 (en) 1970-06-04 1970-11-26 Bleaching minerals - using powdered zinc and sulphur dioxide

Country Status (2)

Country Link
CA (1) CA927057A (en)
FR (1) FR2095447A5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453260A1 (en) * 1989-10-10 1991-10-23 MINEMET (Proprietary) Limited The treatment of mineral surfaces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453260A1 (en) * 1989-10-10 1991-10-23 MINEMET (Proprietary) Limited The treatment of mineral surfaces

Also Published As

Publication number Publication date
CA927057A (en) 1973-05-29

Similar Documents

Publication Publication Date Title
CA980091A (en) Process for decreasing the total sulphur content of claus off-gases
CA1020329A (en) Process for reducing the total sulphur content of claus off-gases
ZA714698B (en) A process for reducing the total sulphur content of claus off-gases
ZA708631B (en) A process for reducing the total sulphur content of claus off-gases
GB1318494A (en) Process for preparing a lactulose powder
AU502618B2 (en) Reducing sulphur dioxide to sulphur
CA945740A (en) Process for reducing the combined sulphur content of claus tail gases
FR2095447A5 (en) Bleaching minerals - using powdered zinc and sulphur dioxide
ZA708341B (en) Increasing the rate of reaction in reducing calcium sulfate to calcium sulfide
CA930484A (en) Concentration of spodumene using flotation
ZA735471B (en) Reduction of sulphur dioxide to sulphur
ZA722501B (en) Method for the concentration of hydrogen peroxide
GB1242723A (en) Improvements relating to window cartons
GB1405317A (en) Method of treating waste water from a desulphurization process with ozone
IE36901L (en) Treating calcium sulphate
FR2102391A5 (en) Sodium and/or ammonium sulphatozirconate acid salts - - tanning agents
CA955730A (en) Process of reducing sulphur dioxide to elemental sulphur
CA945343A (en) Treatment of a sulfite-containing solution to produce elemental sulfur
CA926561A (en) Oxidation of malodorous sulphur compounds in kraft process
CA1019539A (en) Process for reducing the total sulphur content of claus off-gases
AU451212B2 (en) Treatment ofa sulfite and bisulfite containing solution to produce elemental sulfur
AU459053B2 (en) Reducing total sulphur content of claus off-gases
CA947473A (en) Process for reducing the total sulphur content of claus off-gases
BE767618A (en) Dense gypsum prodn by seeding sulphuric acid and lime mixture - with gypsum
FR2018458A1 (en) Therapeutic paste for rheumatics and skin complaints

Legal Events

Date Code Title Description
ST Notification of lapse