ES349758A1 - A procedure to obtain phosphoric acid via wet. (Machine-translation by Google Translate, not legally binding) - Google Patents

A procedure to obtain phosphoric acid via wet. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES349758A1
ES349758A1 ES349758A ES349758A ES349758A1 ES 349758 A1 ES349758 A1 ES 349758A1 ES 349758 A ES349758 A ES 349758A ES 349758 A ES349758 A ES 349758A ES 349758 A1 ES349758 A1 ES 349758A1
Authority
ES
Spain
Prior art keywords
sulfuric acid
calcium sulfate
phosphoric acid
cake
sulfate hemihydrate
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
ES349758A
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.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Edison SpA
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 Montedison SpA, Montecatini Edison SpA filed Critical Montedison SpA
Publication of ES349758A1 publication Critical patent/ES349758A1/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • 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)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

A procedure to obtain phosphoric acid by wet route, reacting natural phosphate rocks with sulfuric acid, characterized by the following operations: a) rock attack with an aqueous solution of phosphoric acid and sulfuric acid, whereby a slurry of calcium sulfate hemihydrate and phosphoric acid in aqueous solution is obtained, for example at 40-45% P2O5; b) separation of the calcium sulfate hemihydrate obtained during the attack (operation a), in a filter equipped for multiple washes with separation of the produced phosphoric acid, washing of the cake by means of an aqueous solution of sulfuric acid and obtaining of a cake of Calcium sulfate hemihydrate and an aqueous washing solution based on sulfuric acid and phosphoric acid, which added to concentrated sulfuric acid, is recycled to attack (operation a); c) treatment of the calcium sulfate hemihydrate cake, obtained by separation (operation b), with an aqueous solution diluted with sulfuric acid, with recrystallization from calcium sulfate in its dihydrated form and formation of a slurry of calcium dihydrate in a solution aqueous diluted with sulfuric acid; d) separation of the calcium sulfate dihydrate apart from the slurry obtained in the previous treatment (operation g) with final washing of the cake by means of water and the consequent obtaining of a filtrate that, added with sulfuric acid, is fed to the washing of the Calcium sulfate hemihydrate separated after the attack (operation b), from an aqueous solution diluted with sulfuric acid from said final wash, which passes to recrystallization of the calcium sulfate hemihydrate to the dihydrated form, from the previous treatment (operation c), and a gypsum dihydrate cake that is soaked in water acidified by sulfuric acid and that leaves the cycle. (Machine-translation by Google Translate, not legally binding)
ES349758A 1967-01-26 1968-01-25 A procedure to obtain phosphoric acid via wet. (Machine-translation by Google Translate, not legally binding) Expired ES349758A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1190267 1967-01-26

Publications (1)

Publication Number Publication Date
ES349758A1 true ES349758A1 (en) 1969-11-01

Family

ID=11138624

Family Applications (1)

Application Number Title Priority Date Filing Date
ES349758A Expired ES349758A1 (en) 1967-01-26 1968-01-25 A procedure to obtain phosphoric acid via wet. (Machine-translation by Google Translate, not legally binding)

Country Status (3)

Country Link
ES (1) ES349758A1 (en)
FR (1) FR1562942A (en)
NL (1) NL6800867A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653826A (en) * 1967-09-21 1972-04-04 Nissan Chemical Ind Ltd Process for the production of phosphoric acid at a high concentration and a gypsum by-product of improved quality
PL116006B1 (en) * 1978-05-06 1981-05-30 Politechnika Wroclawska Method of waste phosphogypsum rinsing
FR2465971A1 (en) * 1979-09-26 1981-03-27 Rhone Poulenc Ind IMPROVED PROCESS FOR HOLDING REACTORS IN TEMPERATURE

Also Published As

Publication number Publication date
NL6800867A (en) 1968-07-29
FR1562942A (en) 1969-04-11

Similar Documents

Publication Publication Date Title
ES413009A1 (en) Calcium sulfate whisker fibers and the method for the manufacture thereof
GB992468A (en) Improvements in or relating to the production of calcium sulphate ª‡-hemihydrate crystals
ES349758A1 (en) A procedure to obtain phosphoric acid via wet. (Machine-translation by Google Translate, not legally binding)
GB1220963A (en) Process for the production of phosphoric acid at a high concentration and gypsum by-product of improved quality
GB1108560A (en) Preparation of a diazo resin salt
ES8206374A1 (en) Process for the preparation of phosphoric acid and calcium sulphate anhydrite.
DK111201B (en) Method for purifying waste gypsum derived from the manufacture of phosphoric acid by the action of sulfuric acid on natural phosphates.
GB1328357A (en) Wet process for the manufacture of phosphoric acid and caldium sulphate
GB1244074A (en) Process for the production of sodium methallyl sulphonate
GB1184585A (en) A Method for Manufacturing Pure Gypsum.
GB1250191A (en)
GB1268396A (en) Anhydrous calcium sulphate and calcium sulphate semihydrate
GB1271925A (en) THE PRODUCTION OF CALCIUM SULPHATE alpha-HEMIHYDRATE
ES330957A1 (en) A continuous procedure for the preparation of phosphoric acid and plaster. (Machine-translation by Google Translate, not legally binding)
ES310115A1 (en) A procedure for the production of phosphoric acid and gypsum crystals. (Machine-translation by Google Translate, not legally binding)
DK131423B (en) Process for the continuous filtration of slurries resulting from acidification of phosphorite to the production of phosphoric acid and gypsum by the semi-hydrate / dihydrate method.
BE750404A (en) PROCESS FOR PREPARING HEMI-HYDRATE CALCIUM SULPHATE FROM IMPURE GYPSES, IN PARTICULAR FROM RESIDUAL PHOSPHORIC ACID GYPSUM.
SU31436A1 (en) The method of obtaining oxalic acid from its medium sodium salt
GB1451609A (en) Process for reducing calcium sulphate scale formation
SU477942A1 (en) The method of producing phosphoric acid
ES431984A1 (en) Procedure to produce phosphoric acid by wetland. (Machine-translation by Google Translate, not legally binding)
GB1278247A (en) Phosphoric acid
SU372240A1 (en) METHOD OF OBTAINING ZINC CHROME
ES401081A1 (en) Method of producing phosphoric acid and calcium sulphate
JPS5265796A (en) Method for production of anhydrous gypsum of type ii