METHOD OF PRODUCTION OF STRONTIUM CARBONATE Russian patent published in 2005 - IPC

FIELD: chemical industry; production of strontium carbonate.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to production of strontium carbonate. The method provides for extraction and purification of strontium carbonate including isotope-enriched strontium carbonate produced by the electromagnetic separation method. The strontium concentrate is treated with an acid producing strontium-carrying sediment, transfer strontium into a solution with a separation and washing-down of the insoluble residue, produce crystals of strontium nitrate, purify the crystals from impurities by their washing-down with nitric acid. Then the crystals are dehydrated, dissolved and separated form impurities with the subsequent production of strontium carbonate. At that a solution produced after treatment of the strontium carbonate should be previously purified by settling and separation of the iron group impurities present in the form of hydroxides, and barium and lead - in the form of sulfates. The strontium-carrying sediment is settled in the form of the strontium carbonate due to addition in the solution of ammonium carbonate and ammonia with subsequent calcinations of the sediment at the temperature of 600-700°C. Strontium transfer in the solution by treatment of the calcined sediment of strontium carbonate with nitric acid at the ratio of (1:2) - (1:3). The dehydrated crystals of strontium nitrate are dissolved in water at the mass ratio of water to strontium nitrate equal to (1-2) :1 and the strontium carbonate is subjected to settling with the help of ammonium carbonate at pH equal to 9-10. The procedure of the preliminary separation of impurities in the form of hydroxides, sulfates and ammoniac complexes, calcinations of strontium-carrying with its subsequent dissolution and separation of impurities and a sedimentation of strontium with the help of ammonium carbonate at рН equal to 9-10 allows to extract 99.2 % of strontium-88 carbonate with a purification efficiency of 99.999 %. The technical result is production of pure strontium carbonate at minimum losses at phases of processing.

EFFECT: the invention ensures production of pure strontium carbonate at minimum losses at phases of processing.

3 cl, 5 ex