Analysis of hazardous characteristics of strontium salt residue in the production of strontium carbonate

The strontium salt slag produced from the strontium carbonate production process in one strontium carbonate enterprise in different years was acquired. The contents and leaching concentrations of heavy metals and the amount of H₂S after reacting with the acid in strontium slag were analyzed, and the risk characteristic of the strontium slag researched. The results showed that the Sr content of strontium slag was the highest, with the maximum value of 175 000 mg/kg and the average of 112 000 mg/kg. The maximum and average contents of Ba were 6 020 and 3 420 mg/kg, respectively. The contents of other heavy metals such as As, Cr, Cu, Ni, Pb, Be and Cd were below 100 mg/kg. The Sr concentration in strontium slag was the highest with the maximum and the average values of 360 and 180 mg/L, respectively. The leaching concentrations of Ba, Pb and As were all lower. The average concentration of H₂S of strontium slag in acid reaction was 0.23 mg/kg and the maximum value was 0.45 mg/kg. The leaching of heavy metals in strontium slag and the concentration of H₂S in acid reaction decreased with the increase of storage time.