JPS5692122A - Manufacture of vanadium-free alkali chromate - Google Patents

Manufacture of vanadium-free alkali chromate

Info

Publication number
JPS5692122A
JPS5692122A JP16822279A JP16822279A JPS5692122A JP S5692122 A JPS5692122 A JP S5692122A JP 16822279 A JP16822279 A JP 16822279A JP 16822279 A JP16822279 A JP 16822279A JP S5692122 A JPS5692122 A JP S5692122A
Authority
JP
Japan
Prior art keywords
soln
caso
alkali chromate
contg
chromate
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
JP16822279A
Other languages
Japanese (ja)
Other versions
JPS5934652B2 (en
Inventor
Hiroyuki Kashiwase
Kingo Takeuchi
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.)
Nippon Chemical Industrial Co Ltd
Original Assignee
Nippon Chemical Industrial Co 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 Nippon Chemical Industrial Co Ltd filed Critical Nippon Chemical Industrial Co Ltd
Priority to JP16822279A priority Critical patent/JPS5934652B2/en
Publication of JPS5692122A publication Critical patent/JPS5692122A/en
Publication of JPS5934652B2 publication Critical patent/JPS5934652B2/en
Expired legal-status Critical Current

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  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

PURPOSE: To almost thoughly separate and remove V in an aqeuous alkali chromate soln. by adding CaSO4 to the soln. and allowing them to react with each other in a specified pH range.
CONSTITUTION: CaSO4 is added to an aqeous alkali chromate soln. contg. V in a Ca/V molar ratio of ≥2, preferably 4W10, and after adding caustic alkali to ajust the soln. to 10.5W13pH as required, they are allowed to react with each other at ordinary temp. or above for ≥10min to form a slightly soluble V compound. Solid- liq. separation is then carried out to obtain V-free alkali chromate. The separated V-contg. residue is repulped with water and adjusted to 1W7pH with sulfuric acid to form a CaSO4 precipitate as well as leach most of the V into the soln. The CaSO4 is recovered by solid-liq. separation and recycled to the next process of removing V from alkali chromate. The V-contg. soln. is concd. by heating and recovered as vanadic acid.
COPYRIGHT: (C)1981,JPO&Japio
JP16822279A 1979-12-26 1979-12-26 Production method of alkali chromate that does not contain vanadium Expired JPS5934652B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16822279A JPS5934652B2 (en) 1979-12-26 1979-12-26 Production method of alkali chromate that does not contain vanadium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16822279A JPS5934652B2 (en) 1979-12-26 1979-12-26 Production method of alkali chromate that does not contain vanadium

Publications (2)

Publication Number Publication Date
JPS5692122A true JPS5692122A (en) 1981-07-25
JPS5934652B2 JPS5934652B2 (en) 1984-08-23

Family

ID=15864041

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16822279A Expired JPS5934652B2 (en) 1979-12-26 1979-12-26 Production method of alkali chromate that does not contain vanadium

Country Status (1)

Country Link
JP (1) JPS5934652B2 (en)

Also Published As

Publication number Publication date
JPS5934652B2 (en) 1984-08-23

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