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ES329179A1 - Procedure for the manufacture of phosphoric acid and calcium sulfate hemihydrate via via humeda. (Machine-translation by Google Translate, not legally binding) - Google Patents

Procedure for the manufacture of phosphoric acid and calcium sulfate hemihydrate via via humeda. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES329179A1
ES329179A1 ES0329179A ES329179A ES329179A1 ES 329179 A1 ES329179 A1 ES 329179A1 ES 0329179 A ES0329179 A ES 0329179A ES 329179 A ES329179 A ES 329179A ES 329179 A1 ES329179 A1 ES 329179A1
Authority
ES
Spain
Prior art keywords
calcium sulfate
gypsum
phosphoric acid
translation
manufacture
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
ES0329179A
Other languages
Spanish (es)
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.)
Prayon SA
Original Assignee
Prayon SA
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 Prayon SA filed Critical Prayon SA
Publication of ES329179A1 publication Critical patent/ES329179A1/en
Expired 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
    • C04B11/00—Calcium sulfate cements
    • C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/18—Phosphoric acid
    • C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Special Chairs (AREA)

Abstract

Process for the manufacture of phosphoric acid and calcium sulfate hemihydrate by wet process, by means of the attack of natural phosphates by a mixture of sulfuric and phosphoric acids, with initial production of a gypsum paste dihydrate which contains, mainly, phosphoric acid and gypsum, characterized in that the gypsum paste provided by said attack is continuously mixed with concentrated sulfuric acid, heating the mixture, if necessary by the contribution of external calories, to create in it conditions in which the hemihydrate is the stable form of crystallization of calcium sulfate, in order to recrystallize the gypsum continuously in hemihydrate which is then separated from the pulp, said conditions comprising: A temperature of 70 to 90º C, preferably 75 to 85º C; a concentration in P2O5 of the liquid of 15 to 35%, preferably 20 to 30%; a concentration in H2SO4 of the liquid of 2 to 25%, preferably 10 to 20%, and a flow rate of treated gypsum slurry per hour of approximately 0.5 to 1.5 times the volume of the recrystallization vessel. (Machine-translation by Google Translate, not legally binding)
ES0329179A 1965-07-07 1966-07-06 Procedure for the manufacture of phosphoric acid and calcium sulfate hemihydrate via via humeda. (Machine-translation by Google Translate, not legally binding) Expired ES329179A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU49007 1965-07-07

Publications (1)

Publication Number Publication Date
ES329179A1 true ES329179A1 (en) 1967-05-01

Family

ID=19724362

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0329179A Expired ES329179A1 (en) 1965-07-07 1966-07-06 Procedure for the manufacture of phosphoric acid and calcium sulfate hemihydrate via via humeda. (Machine-translation by Google Translate, not legally binding)

Country Status (16)

Country Link
AT (1) AT269064B (en)
BE (1) BE683739A (en)
BG (1) BG20319A3 (en)
DE (1) DE1567821B1 (en)
DK (1) DK130955B (en)
ES (1) ES329179A1 (en)
FI (1) FI47652C (en)
FR (1) FR1485940A (en)
GB (1) GB1111078A (en)
IL (1) IL26076A (en)
LU (1) LU49007A1 (en)
NL (1) NL6609093A (en)
NO (1) NO116287B (en)
OA (1) OA02091A (en)
SE (1) SE336775B (en)
SU (1) SU378002A3 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984525A (en) * 1967-02-01 1976-10-05 Albright & Wilson Limited Manufacture of phosphoric acid
FR2171861A1 (en) * 1972-02-11 1973-09-28 Cerphos Phosphoric acid prodn - with wet screening of digester product
DE2233189C2 (en) * 1972-07-06 1986-06-26 Ruhr-Stickstoff Ag, 4630 Bochum Process for the production of pure calcium sulfate hemihydrate
US4059674A (en) * 1972-07-18 1977-11-22 Pullman Incorporated Method for manufacturing phosphoric acid and gypsum
SE440069B (en) * 1982-12-22 1985-07-15 Boliden Ab PROCEDURE FOR RECYCLING GYPS
DE3585627D1 (en) * 1985-12-23 1992-04-16 Prayon Rupel S A Soc Chimique METHOD FOR TREATING ALPHA CALCIUM SULFATE SEMI-HYDRATE AND PRODUCT OBTAINED BY THE PROCEDURE.
BE1016065A3 (en) * 2004-06-01 2006-02-07 Prayon Technologies Process phosphoric acid production.
BE1019055A3 (en) 2009-12-02 2012-02-07 Prayon Technologies PROCESS FOR PRODUCING PHOSPHORIC ACID
CA2837495C (en) 2011-06-01 2018-01-09 Prayon Technologies A method for producing phosphoric acid of the dihydrate/hemihydrate type
EP2771280B1 (en) 2011-10-24 2018-02-21 Hydrometal SA Method for treating phosphate rock
CN104528798A (en) * 2014-12-16 2015-04-22 中国科学院青海盐湖研究所 Method for purifying low-grade natural gypsum or gypsum tailings by recrystallization
DE102016212242B4 (en) 2016-07-05 2019-02-07 Technische Universität Bergakademie Freiberg Process for the production of phosphoric acid from phosphorus-containing primary and secondary raw materials
CN111807340B (en) * 2019-04-10 2023-07-21 中石化南京工程有限公司 Semi-water-dihydrate phosphoric acid production device and method

Also Published As

Publication number Publication date
FR1485940A (en) 1967-06-23
FI47652C (en) 1974-02-11
GB1111078A (en) 1968-04-24
DE1567821B1 (en) 1971-08-12
BE683739A (en) 1967-01-06
IL26076A (en) 1970-07-19
NL6609093A (en) 1967-01-09
LU49007A1 (en) 1967-01-09
AT269064B (en) 1969-03-10
OA02091A (en) 1970-05-05
FI47652B (en) 1973-10-31
DK130955C (en) 1975-12-29
SE336775B (en) 1971-07-19
BG20319A3 (en) 1975-11-05
SU378002A3 (en) 1973-04-17
DK130955B (en) 1975-05-12
NO116287B (en) 1969-03-03

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