Title:
PROCESS FOR THE RECOVERY OF PHOSPHATE FROM PHOSPHATE ROCK
Document Type and Number:
WIPO Patent Application WO2002040426
Kind Code:
A3
Abstract:
There is disclosed a wet process for the recovery of phosphate from phosphate rock which comprises leaching finely divided particles of phosphate rock with a protic acid at a temperature and for a time that favours dissolution, into a leachate, of the phosphate in relation to an impurity, and, isolating the leachate. An appropriate combination of particle size, leach time and leach temperature can achieve high phosphate recovery while reducing the amount of impurities.
Inventors:
CARSTENS LESLIE L (CA)
WYNNYK NICK P (CA)
WYNNYK NICK P (CA)
Application Number:
PCT/CA2001/001573
Publication Date:
September 06, 2002
Filing Date:
November 08, 2001
Export Citation:
Assignee:
AGRIUM INC (CA)
CARSTENS LESLIE L (CA)
WYNNYK NICK P (CA)
CARSTENS LESLIE L (CA)
WYNNYK NICK P (CA)
International Classes:
C01B25/22; C05B11/06; C05B11/08; (IPC1-7): C05B11/06; C05B11/08; C01B25/22
Foreign References:
| US4039624A | 1977-08-02 | |||
| DD50043A | ||||
| FR1439339A | 1966-05-20 | |||
| US2709649A | 1955-05-31 | |||
| US2890936A | 1959-06-16 | |||
| EP0200073A2 | 1986-11-05 |
Other References:
UNIDO ET AL.: "Fertilizer Manual", 1998, KLUWER ACADEMIC PUBLISHERS, DORDRECHT, THE NETHERLANDS, XP002203601
CHEMICAL ABSTRACTS, vol. 96, no. 22, 31 May 1982, Columbus, Ohio, US; abstract no. 183570k, M.M. RASULOV ET AL.: "Particle size of lumpy Karatau phosphorites and filtering properties of the insoluble residue from the decomposition in nitric acid" page 152; XP002203602
CHEMICAL ABSTRACTS, vol. 97, no. 15, 11 October 1982, Columbus, Ohio, US; abstract no. 126413h, M.M. RASULOV ET AL.: "Complex fertilizer" page 621; XP002203603
CHEMICAL ABSTRACTS, vol. 95, no. 26, 28 December 1981, Columbus, Ohio, US; abstract no. 222250g, "Wet process phosphoric acid" page 139; XP002203604
CHEMICAL ABSTRACTS, vol. 96, no. 22, 31 May 1982, Columbus, Ohio, US; abstract no. 183570k, M.M. RASULOV ET AL.: "Particle size of lumpy Karatau phosphorites and filtering properties of the insoluble residue from the decomposition in nitric acid" page 152; XP002203602
CHEMICAL ABSTRACTS, vol. 97, no. 15, 11 October 1982, Columbus, Ohio, US; abstract no. 126413h, M.M. RASULOV ET AL.: "Complex fertilizer" page 621; XP002203603
CHEMICAL ABSTRACTS, vol. 95, no. 26, 28 December 1981, Columbus, Ohio, US; abstract no. 222250g, "Wet process phosphoric acid" page 139; XP002203604
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