Abstract: Recycling strontium in waste residue of strontium carbonate production by carbon reduction method is the key to increase comprehensive utilization level of strontium resources and to slove the pollution of strontium carbonate waste residue.By-produced hydrochloric acid in salt lake exploitation was used as leaching medium to recover strontium chloride by leaching the strontium carbonate waste residue.Relation of hydrochloric acid dosage and strontium recovery rate as well as the influence of leaching process on separating property of slurry was studied.Results showed that strontium recovery rate was at 75.9%~80.8% when leaching for 2 h under the condions of 75 ℃ and pH at -1.52~1.40;after the slurry was neutralized to pH at 5~6,the dissolved silicic acid separated out rapidly and formed an easy state for separation,and then the general separating equipment can be adopted to reach high efficient solid-liquid separation.Research conclusion can provide a reference for acid leaching control,choosing solid-liquid separation mode and equipment selection of such kind of waste residues. 

Key words: strontium carbonate waste residue, slurry leached by hydrochloride acid, strontium recovery rate, separating property