C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/203
C01F 11/38 (2006.01) C01F 11/18 (2006.01)
Patent
CA 1158021
Abstract: METHOD OF PRODUCING STRONTIUM NITRATE A method of producing strontium nitrate which comprises: (a) converting strontium sulfate to strontium carbonate by heating a suspension of the strontium sulfate in a solution of an alkali metal carbonate whereby there is formed a precipitate of crude strontium carbonate and a solution of an alkali metal sulfate; washing the precipitate with water to substantially remove the alkali metal sulfate and give a washed precipitate of crude strontium carbonate; (b) forming a strontium nitrate solution by adding nitric acid to an aqueous suspension of the washed precipitate from step (a) whereby carbonate is con- verted to nitrate; (c) treating the strontium nitrate solution from (b) with an alkaline metal hydroxide whereby heavy metals and a substantial amount to an essentially total amount of magnesium are precipitated as hydroxides; (d) producing a clarified strontium nitrate solu- tion by separating any insoluble material from the solution of step (c); (e) subjecting the clarified strontium nitrate solution of step (d) to evaporative crystallization to selectively form strontium nitrate crystals; (f) separating and water washing the strontium nitrate crystals in step (e) to give isolated strontium nitrate crystals and mother liquor; and optionally (g) returning the mother liquor in step (f) to the evaporative crystallization stage in step (e), while sufficiently purging the mother liquor with a purge stream to prevent impurities therein from reaching a level at which they co-crystallize with the strontium nitrate; (h) washing the isolated strontium nitrate crystals in step (f) to remove adhering mother liquor and give purified strontium nitrate crystals and wash water. The method does away with having to purify the intermediate strontium carbonate.
357365
Manganaro James L.
Sansone Michael J.
Fmc Corporation
Osler Hoskin & Harcourt Llp
LandOfFree
Method of producing strontium nitrate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of producing strontium nitrate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing strontium nitrate will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-970626