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RO93136B1 - Process for preparing cryolite - Google Patents

Process for preparing cryolite

Info

Publication number
RO93136B1
RO93136B1 RO120390A RO12039085A RO93136B1 RO 93136 B1 RO93136 B1 RO 93136B1 RO 120390 A RO120390 A RO 120390A RO 12039085 A RO12039085 A RO 12039085A RO 93136 B1 RO93136 B1 RO 93136B1
Authority
RO
Romania
Prior art keywords
cryolite
obtaining
temperature
aluminum hydroxide
hydrofluoric acid
Prior art date
Application number
RO120390A
Other languages
Romanian (ro)
Other versions
RO93136A2 (en
Inventor
Calin Gheorghiu
Original Assignee
Institutul De Inginerie Tehnologica Si Proiectare Pentru Industria Chimica
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 Institutul De Inginerie Tehnologica Si Proiectare Pentru Industria Chimica filed Critical Institutul De Inginerie Tehnologica Si Proiectare Pentru Industria Chimica
Priority to RO120390A priority Critical patent/RO93136B1/en
Publication of RO93136A2 publication Critical patent/RO93136A2/en
Publication of RO93136B1 publication Critical patent/RO93136B1/en

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  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

Inventia se refera la un procedeu de obtinere a criolitului pornind de la acid fluorhidric, hidroxid de aluminiu si carbonat de sodiu. în prima faza a procesului acidului fluorhidric diluat la 25...48% HF, lipsit de impuritati, în special siliciu, reactioneaza cu hidroxid de aluminiu la o temperatura cuprinsa între 60 si 100 degree C cu formarea acidului fluoaluminic solutie, dupa care, în faza a doua are loc reactia de precipitare a criolitului cu carbonat de sodiu sau solid. Reactia are loc la o temperatura de 50...100 degree C si un pH = 5...7, formîndu-se o suspensie de criolit cu raport S/L =1/5...1/10 se filtreaza si se calcineaza, obtinîndu-se produsul finit.The invention relates to a process for obtaining cryolite starting from hydrofluoric acid, aluminum hydroxide and sodium carbonate. In the first phase of the diluted hydrofluoric acid process at 25 ... 48% HF, free of impurities, especially silicon, reacts with aluminum hydroxide at a temperature of 60 to 100 ° C with the formation of fluoaluminic acid solution, the second step is the precipitation reaction of cryolite with sodium or solid carbonate. The reaction is carried out at a temperature of 50-100 ° C and a pH of 5 ... 7, forming a cryolite suspension with an S / L = 1/5 ... 1/10 ratio being filtered and calcined, obtaining the finished product.

RO120390A 1985-10-15 1985-10-15 Process for preparing cryolite RO93136B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RO120390A RO93136B1 (en) 1985-10-15 1985-10-15 Process for preparing cryolite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RO120390A RO93136B1 (en) 1985-10-15 1985-10-15 Process for preparing cryolite

Publications (2)

Publication Number Publication Date
RO93136A2 RO93136A2 (en) 1987-12-30
RO93136B1 true RO93136B1 (en) 1987-12-31

Family

ID=20118081

Family Applications (1)

Application Number Title Priority Date Filing Date
RO120390A RO93136B1 (en) 1985-10-15 1985-10-15 Process for preparing cryolite

Country Status (1)

Country Link
RO (1) RO93136B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1043033C (en) * 1994-08-30 1999-04-21 湘乡铝厂 Method for production of high-molecular-ratio ice spar

Also Published As

Publication number Publication date
RO93136A2 (en) 1987-12-30

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