FR2171861A1 - Phosphoric acid prodn - with wet screening of digester product - Google Patents

Phosphoric acid prodn - with wet screening of digester product

Info

Publication number
FR2171861A1
FR2171861A1 FR7204638A FR7204638A FR2171861A1 FR 2171861 A1 FR2171861 A1 FR 2171861A1 FR 7204638 A FR7204638 A FR 7204638A FR 7204638 A FR7204638 A FR 7204638A FR 2171861 A1 FR2171861 A1 FR 2171861A1
Authority
FR
France
Prior art keywords
screening
crystallisn
phosphoric acid
appts
liq
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
FR7204638A
Other languages
French (fr)
Other versions
FR2171861B1 (en
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.)
CERPHOS
Original Assignee
CERPHOS
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 CERPHOS filed Critical CERPHOS
Priority to FR7204638A priority Critical patent/FR2171861A1/en
Publication of FR2171861A1 publication Critical patent/FR2171861A1/en
Application granted granted Critical
Publication of FR2171861B1 publication Critical patent/FR2171861B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
    • C01B25/228—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
    • C01B25/231—Dihydrate-hemihydrate process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/20—Vibrating the filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/28—Strainers not provided for elsewhere
    • 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
    • C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
    • C01B25/228—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
    • 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
    • C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
    • C01B25/228—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
    • C01B25/229—Hemihydrate-dihydrate process
    • C01B25/2295—Hemihydrate-dihydrate process the conversion being performed in one or more vessels different from those used for reaction after separation of phosphoric acid

Abstract

Double crystallisn. process for H3PO4 prodn. in which the slurry obtd. by acid digestion of phosphate rock is subjected, after the first crystallisation of CaSO4 but before 2nd crystallisn., to a wet-screening stage, while the second liq.-solid sepn. is carried out after the second crystallisn. by conventional filtration. Process allows the two liq.-solid sepns. to be carried out economically while acids with high P2O5 contents are obtd. Pref. the sludge is treated before screening with an agent to encourage colloidal particle agglomeration. The screening appts. is pref. vibrated and fitted with several screens of different mesh sizes, which have several different slopes in different parts of the appts.
FR7204638A 1972-02-11 1972-02-11 Phosphoric acid prodn - with wet screening of digester product Granted FR2171861A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7204638A FR2171861A1 (en) 1972-02-11 1972-02-11 Phosphoric acid prodn - with wet screening of digester product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7204638A FR2171861A1 (en) 1972-02-11 1972-02-11 Phosphoric acid prodn - with wet screening of digester product

Publications (2)

Publication Number Publication Date
FR2171861A1 true FR2171861A1 (en) 1973-09-28
FR2171861B1 FR2171861B1 (en) 1976-07-23

Family

ID=9093363

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7204638A Granted FR2171861A1 (en) 1972-02-11 1972-02-11 Phosphoric acid prodn - with wet screening of digester product

Country Status (1)

Country Link
FR (1) FR2171861A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274177A2 (en) * 1986-12-08 1988-07-13 MITSUI TOATSU CHEMICALS, Inc. Process for the production of highly concentrated phosphoric acid

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124530A (en) * 1964-03-10 Filter
FR1485940A (en) * 1965-07-07 1967-06-23 Prayon Wet process for the manufacture of phosphoric acid and calcium sulfate hemihydrate
FR1498272A (en) * 1965-12-14 1967-10-20 Kuhlmann Ets Continuous and direct wet manufacturing process of concentrated phosphoric acid
GB1113922A (en) * 1964-08-19 1968-05-15 Fisons Ltd Clarifying phosphoric acid
FR1534672A (en) * 1964-03-06 1968-08-02 Production process for phosphoric acid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124530A (en) * 1964-03-10 Filter
FR1534672A (en) * 1964-03-06 1968-08-02 Production process for phosphoric acid
GB1113922A (en) * 1964-08-19 1968-05-15 Fisons Ltd Clarifying phosphoric acid
FR1485940A (en) * 1965-07-07 1967-06-23 Prayon Wet process for the manufacture of phosphoric acid and calcium sulfate hemihydrate
FR1498272A (en) * 1965-12-14 1967-10-20 Kuhlmann Ets Continuous and direct wet manufacturing process of concentrated phosphoric acid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274177A2 (en) * 1986-12-08 1988-07-13 MITSUI TOATSU CHEMICALS, Inc. Process for the production of highly concentrated phosphoric acid
EP0274177A3 (en) * 1986-12-08 1989-07-26 Mitsui Toatsu Chemicals Inc. Process for the production of highly concentrated phosphoric acid

Also Published As

Publication number Publication date
FR2171861B1 (en) 1976-07-23

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Legal Events

Date Code Title Description
ST Notification of lapse