Water leaching of SrS and precipitation of SrCO_3 using carbon dioxide as the precipitating agent

摘要

Strontium sulphide (SrS) was water-leached at 85 deg C, generating a saturated solution of approximately 50 g/L Sr. About 92percent of the strontium contained in the SrS was leached within 60-80 ruin. Almost all of the water-soluble strontium were completely leached out from the sulphide material. The strontium-saturated solution was treated with carbon dioxide to precipitate strontium carbonate (SrCO_3). Precipitation efficiencies in excess of 99percent were attained in both batch and continuous multi-column test programs. Hydrogen sulphide gas was generated as a byproduct in the precipitation process at a slurry pH <= 8. Particle size analyses of SrCO_3 precipitates indicate that a longer retention time enhances crystal growth.