Preparation of Light Sulfur Retention Ceramsite from Jarosite Residues [利用铁矾渣制备轻质固硫陶粒]

作者：Liu M.; Sun Z.; Li S.^*; Wang C.; Li H.; Zhang Y.; Chen H.

来源：Chinese Journal of Environmental Engineering, 2022, 16(11): 3696-3704.

DOI：10.12030/j.cjee.202205039

• calcium oxide
• immobilization of heavy metals
• jarosite residues
• sulfur retention mechanism
• sulfur-retention sorbent

Jarosite residues is the waste residue produced by iron removal in jarosite method in the process of lithium-ion batteries recovery, and it decomposes to sulfur dioxide easily at high temperatures. The rational and effective way to utilize jarosite residues is to prepare sulfur retention ceramsite by adding sulfur retention agent. Through the thermodynamic calculation of different oxides, and combined with mixed calcination experiment of sulfur retention agent with jarosite residues, CaO was chosen as the sulfur retention agent in the paper. The effect of the amount of sulfur retention agent on sulfur retention efficiency and properties of ceramsite were investigated. Results showed that the increase of the amount of sulfur retention agent led to an increase in sulfur retention efficiency, an increase and then decrease trend in water absorption rate and compressive strength, and the reverse trend in bulk density and apparent density. Under Ca/S of 2.35, the sulfur retention rate could reach to the highest of 48.8%, with the water absorption rate of 3.89%, the compressive strength of 0.79 MPa, and the apparent and bulk densities of 0.72 g·cm?3 and 0.51 g·cm?3, respectively. XRD and TG-DSC-FTIR were used to further investigate the mechanism of sulfur retention. It was found that CaSO4 and K2SO4 with higher decomposition temperature were formed by the interaction of sulfate with sulfur retention agent. The result of toxicity leaching meet the national standard. This study provided a reference for further research on the high-value and environmental protection applications of jarosite residues.

• 单位
  中国科学院; 中国科学院大学