GB902361A - Improvements in defluorination of phosphate rock - Google Patents

Improvements in defluorination of phosphate rock

Info

Publication number
GB902361A
GB902361A GB4247860A GB4247860A GB902361A GB 902361 A GB902361 A GB 902361A GB 4247860 A GB4247860 A GB 4247860A GB 4247860 A GB4247860 A GB 4247860A GB 902361 A GB902361 A GB 902361A
Authority
GB
United Kingdom
Prior art keywords
phosphate
na2o
charge
rock
compound
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
GB4247860A
Inventor
Clinton Allen Hollingsworth
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.)
SMITH DOUGLASS Co
Original Assignee
SMITH DOUGLASS Co
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 SMITH DOUGLASS Co filed Critical SMITH DOUGLASS Co
Priority to GB4247860A priority Critical patent/GB902361A/en
Publication of GB902361A publication Critical patent/GB902361A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B13/00—Fertilisers produced by pyrogenic processes from phosphatic materials
    • C05B13/02—Fertilisers produced by pyrogenic processes from phosphatic materials from rock phosphates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Glass Compositions (AREA)

Abstract

In the defluorination of phosphate rock, the rock is calcined at a temperature of at least 2200 DEG F. in the presence of water vapour and an acid phosphate compound and a sodium compound. The proportions of the reactants are so chosen that (1) the weight ratio of the added sodium compound (calculated as Na2O) to the added acid phosphate compound (calculated as P2O5) is kept between 0,5 and 0,8; (2) the amount of acid phosphate compound (calculated as P2O5) added to the charge is maintained between 7 and 12% by weight of the total charge on a dry basis; (3) the amount of sodium compound (calculated as Na2O) in the charge is kept between 0,3 and 0,7 mol. per mol. of P2O5 present in the phosphate rock; (4) the silica content of the charge is kept between 2% and 6% by weight of the total charge on a dry basis; and (5) the CaO, Na2O, P2O5 and SiO2 content of the combined phosphate rock and reagent mixture is kept such that the mol. ratio of these constituents according to the formula Mols CaO+Na2O-3P2O5/Mols SiO2 does not exceed 1,1. The charge consisting of the reagent mixture and the phosphate rock may be premixed in a mill, formed into pellets (which may be dried) and heated to a temperature of at least 2200 DEG F. but not greater than 2700 DEG F. in a rotary kiln or fluidized bed; in the former case the charge mixture can be introduced in the form of a slurry. The sodium-containing reagent is usually commercial light soda ash having an Na2O content of about 58%, although sodium bicarbonate, hydroxide, phosphate or chloride may be used. p The acid phosphate reagent is usually crude commercial phosphoric acid obtained by reacting sulphuric acid with a phosphate-bearing material, e.g. phosphate rock, but acidic sodium salts of phosphoric acid may be employed. The invention is an improvement in that disclosed in U.S.A. Specification 2,839,377 in which the rock was calcined at at least 2,600 DEG F., the Na2O to P2O5 content of the reaction mixture was between 1,6 and 2,8 and the amount of P2O5 is less than 6% by weight of the total charge. The ratio Mols CaO+Na2O-3P2O5/Mols SiO2 was between 1,3 and 2,8.
GB4247860A 1960-12-09 1960-12-09 Improvements in defluorination of phosphate rock Expired GB902361A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4247860A GB902361A (en) 1960-12-09 1960-12-09 Improvements in defluorination of phosphate rock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4247860A GB902361A (en) 1960-12-09 1960-12-09 Improvements in defluorination of phosphate rock

Publications (1)

Publication Number Publication Date
GB902361A true GB902361A (en) 1962-08-01

Family

ID=10424617

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4247860A Expired GB902361A (en) 1960-12-09 1960-12-09 Improvements in defluorination of phosphate rock

Country Status (1)

Country Link
GB (1) GB902361A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423015A (en) 1982-02-04 1983-12-27 Occidental Chemical Company Process of producing defluorinated product from low BPL phosphate rock
WO2015189333A1 (en) * 2014-06-11 2015-12-17 Outotec (Finland) Oy Production of citrate soluble phosphates by calcination of secondary phosphate sources with a sodium-sulfuric compound

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423015A (en) 1982-02-04 1983-12-27 Occidental Chemical Company Process of producing defluorinated product from low BPL phosphate rock
WO2015189333A1 (en) * 2014-06-11 2015-12-17 Outotec (Finland) Oy Production of citrate soluble phosphates by calcination of secondary phosphate sources with a sodium-sulfuric compound
US10259752B2 (en) 2014-06-11 2019-04-16 Outotec (Finland) Oy Production of citrate soluble phosphates by calcination of secondary phosphate sources with a sodium-sulfuric compound

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