FR2271186A1 - Calcination of kaolin in the presence of hydrochloric acid - gives increased whiteness esp. when rapidly heated - Google Patents

Calcination of kaolin in the presence of hydrochloric acid - gives increased whiteness esp. when rapidly heated

Info

Publication number
FR2271186A1
FR2271186A1 FR7343152A FR7343152A FR2271186A1 FR 2271186 A1 FR2271186 A1 FR 2271186A1 FR 7343152 A FR7343152 A FR 7343152A FR 7343152 A FR7343152 A FR 7343152A FR 2271186 A1 FR2271186 A1 FR 2271186A1
Authority
FR
France
Prior art keywords
kaolin
hcl
calcination
esp
hydrochloric acid
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.)
Granted
Application number
FR7343152A
Other languages
French (fr)
Other versions
FR2271186B1 (en
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.)
MORBIHAN STE NLE EXPL KAOLINS
Original Assignee
MORBIHAN STE NLE EXPL KAOLINS
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 MORBIHAN STE NLE EXPL KAOLINS filed Critical MORBIHAN STE NLE EXPL KAOLINS
Priority to FR7343152A priority Critical patent/FR2271186A1/en
Publication of FR2271186A1 publication Critical patent/FR2271186A1/en
Application granted granted Critical
Publication of FR2271186B1 publication Critical patent/FR2271186B1/fr
Granted 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)

Abstract

A calcined kaolin of high whiteness value is obtd. by calcining kaolin in the presence of HCl at 900-1200 degrees C (1050-1100 degrees C). The kaolin is mixed before calcining with liq. HCl or a chlorinated solid which releases gaseous HCl during calcination, e.g. an alkali(ne earth)chloride. The HCl is used in amt. 1-2 wt % of the wt. of dry kaolin being treated. The mixt. is pref. submitted to a sharp thermal shock to heat it rapidly to the calcination temp. and after treatment is cooled similarly. The kaolin is used as pigments in rubber, elastomers plastics and paints. The HCl removes ferric oxide normally occurring in the kaolin, by reaction forming volatile ferric chloride and moisture. The thermal shock causes the gas to be evolved rapidly at the calcination temp. The rapid heating minimises the dissociation of HCl.
FR7343152A 1973-12-04 1973-12-04 Calcination of kaolin in the presence of hydrochloric acid - gives increased whiteness esp. when rapidly heated Granted FR2271186A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7343152A FR2271186A1 (en) 1973-12-04 1973-12-04 Calcination of kaolin in the presence of hydrochloric acid - gives increased whiteness esp. when rapidly heated

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7343152A FR2271186A1 (en) 1973-12-04 1973-12-04 Calcination of kaolin in the presence of hydrochloric acid - gives increased whiteness esp. when rapidly heated

Publications (2)

Publication Number Publication Date
FR2271186A1 true FR2271186A1 (en) 1975-12-12
FR2271186B1 FR2271186B1 (en) 1978-05-05

Family

ID=9128668

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7343152A Granted FR2271186A1 (en) 1973-12-04 1973-12-04 Calcination of kaolin in the presence of hydrochloric acid - gives increased whiteness esp. when rapidly heated

Country Status (1)

Country Link
FR (1) FR2271186A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012290A1 (en) * 1978-12-06 1980-06-25 Bayer Ag Method for producing calcined clay pigments and their use
US4271130A (en) * 1978-12-06 1981-06-02 Bayer Aktiengesellschaft Process for the preparation of zeolite A from kaolin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012290A1 (en) * 1978-12-06 1980-06-25 Bayer Ag Method for producing calcined clay pigments and their use
US4271130A (en) * 1978-12-06 1981-06-02 Bayer Aktiengesellschaft Process for the preparation of zeolite A from kaolin

Also Published As

Publication number Publication date
FR2271186B1 (en) 1978-05-05

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