GB612517A - Improvements in the manufacture of alkali chromates - Google Patents

Improvements in the manufacture of alkali chromates

Info

Publication number
GB612517A
GB612517A GB26207/45A GB2620745A GB612517A GB 612517 A GB612517 A GB 612517A GB 26207/45 A GB26207/45 A GB 26207/45A GB 2620745 A GB2620745 A GB 2620745A GB 612517 A GB612517 A GB 612517A
Authority
GB
United Kingdom
Prior art keywords
alkali
silica
lime
chromium
increases
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
GB26207/45A
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.)
Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
Original Assignee
Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
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 Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU filed Critical Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
Publication of GB612517A publication Critical patent/GB612517A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/14—Chromates; Bichromates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

Alkali metal chromates are produced by heating at above 1000 DEG C. in the presence of air, a mixture of chromium ore &c., an alkali or alkali salt, lime or a lime-containing body, e.g. dolomite, the silica content being adjusted to a predetermined value by the addition of silica or a silica compound, e.g. talc, so that substantially all the chromium is converted to alkali chromate. The silica content required increases as the ratio Al2O3/CaO increases to 1/3 , and thereafter decreases as the ratio increases further. The quantity of alkali used should be greater than that theoretically necessary for binding the chromium. In an example, employing 1 part Cr2O3, 2 parts sodium carbonate and 4 parts lime and alumina mixture, the silica requirement for maximum yield is 0.7, 1.2, 2.0 and 1.0 for an Al2O3/CaO rato of 1/16 , 1/7 , \ba1/3 and 1/2 respectively. Other examples are given.
GB26207/45A 1942-07-06 1945-10-08 Improvements in the manufacture of alkali chromates Expired GB612517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR612517X 1942-07-06

Publications (1)

Publication Number Publication Date
GB612517A true GB612517A (en) 1948-11-15

Family

ID=8978888

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26207/45A Expired GB612517A (en) 1942-07-06 1945-10-08 Improvements in the manufacture of alkali chromates

Country Status (1)

Country Link
GB (1) GB612517A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2341658A1 (en) * 1976-02-21 1977-09-16 Bayer Ag PERFECTED PROCESS FOR ATTACKING CHROME MINERALS
US4112046A (en) * 1975-12-19 1978-09-05 Bayer Aktiengesellschaft Disintegration of silica-rich chromite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112046A (en) * 1975-12-19 1978-09-05 Bayer Aktiengesellschaft Disintegration of silica-rich chromite
FR2341658A1 (en) * 1976-02-21 1977-09-16 Bayer Ag PERFECTED PROCESS FOR ATTACKING CHROME MINERALS

Similar Documents

Publication Publication Date Title
GB612517A (en) Improvements in the manufacture of alkali chromates
ES355066A1 (en) Phosphate-bonded basic refractory composition
GB908073A (en) Improvements in the manufacture of refractory alumina cements
GB1115386A (en) Refractory magnesia
GB594020A (en) Improvements in refractory compositions
GB711933A (en) Process of making refractory brick
GB424741A (en) Improvements relating to the manufacture of refractory magnesia products
GB672275A (en) Improvements in or relating to the manufacture of tools
GB811985A (en) Improvements in or relating to refractory material
GB981528A (en) Improvements relating to refractories and refractory bricks containing calcined magnesia
GB801279A (en) Improvements in or relating to the manufacture of ceramic materials
GB819777A (en) Relating to refractory brick
GB890192A (en) An improvements in producing metallic magnesium from a magnesium oxide containing material
GB698797A (en) Improvements in or relating to refractory material and method of making the same
GB394115A (en) Improvements in or relating to sintered magnesia and refractory materials containing sintered magnesia
GB546196A (en) Improved manufacture of chromite refractories
GB853783A (en) New piperazine derivatives and process for the preparation thereof
GB481281A (en) Improvements in and relating to refractory products
GB521293A (en) Cements, mortars and the like and plasticizers therefor
GB721916A (en) Improvements in or relating to process for making periclase
GB759770A (en) Improvements in or relating to process for preparing crystalline magnesia and resulting product
ES321330A1 (en) A procedure for the manufacture of a satin satin. (Machine-translation by Google Translate, not legally binding)
GB608594A (en) Improvements in or relating to refractory cements and processes for their preparation
GB569744A (en) Improvements relating to the production of magnesium
GB624539A (en) A method of desulphurizing metals