Studies on the preparation of cryolite by fluoboric acid process

Singh, Gurdial and Kar, B C (1965) Studies on the preparation of cryolite by fluoboric acid process. NML Technical Journal, 7 (3). pp. 21-24.

Restricted to NML users only. Others may use ->



Calcium fluoride, boric acid and sulphuric acid react in an aqueous medium with the formation of fluoboric acid. The reaction goes practically to completion when pure materials are used. Fluoboric acid thus formed can be utilized for the formation of cryolite and other fluorides. A cyclic process for the production of cryolite from metallurgical grade fluorspar, sulphuric acid and boric acid has been studied in this paper. The immediate product, fluoboric acid, which is formed is reacted with hydrated alumina and sodium carbonate to form cryolite while boric acid is regenerated. The spent liquor containing boric acid is cycled a number of times to get more fluoboric acid and thence cryolite. (Mr. Gurdial Singh, Scientist and Dr. B.C. Kar, Scientist, National Metallurgical Laboratory, Jamshedpur)

Item Type:Article
Official URL/DOI:http://library/articleDetails.jsp?recordid=131
Uncontrolled Keywords:Fluoboric acid; Cryolite; Metallurgical grade fluorspar
Divisions:Metal Extraction and Forming
ID Code:1751
Deposited By:Dr. A K Sahu
Deposited On:28 Sep 2010 12:19
Last Modified:07 Nov 2012 15:18
Related URLs:

Repository Staff Only: item control page