Effects of Synthesis Methods for Scorodite on Its Leaching Stability
LIU Zhi-hong YANG Xiao-feng LIU Zhi-yong LI Yu-hu LI Qi-hou
School of Metallurgy and Environment, Central South University School of Metallurgy and Environment, Central South University School of Metallurgy and Environment, Central South University School of Metallurgy and Environment, Central South University School of Metallurgy and Environment, Central South University
Abstract：Scorodite was synthesized under both addition and without addition of crystal seed by atmospheric, hydrothermal and improved atmospheric synthesis methods, ASP, HSP and IASP in abbreviation, and its crystal structure, crystallinity, morphology, particle size, specific surface area, Fe/As mole ratio and leaching stability were characterized, aiming at revealing the relationships among the synthesis methods, composition, structural properties and leaching stability of scorodite. The results show that the synthesis method has significant effect on the composition and structural properties. Scorodite with high crystallinity, small specific surface area, and low Fe/As mole ratio possesses high leaching stability. The order of leaching stability of synthesized scorodite samples follows the order of ASP < HSP < IASP. The scorodite sample synthesized by IASP without addition of crystal seed appears in crystalline particles with large size and pyramidal morphology enclosed by {111}, and possesses the crystallinity of 84.5%, particle size (D50) of 28.2 mm, BET specific surface area of 3.72 m2/g and Fe/As mole ratio of 1.05. With HJ/T300 method, the leaching stability of scorodite sample was tested, after leaching for 10 d, the total arsenic concentration in the leaching solution is only 1.14 mg/L.
刘志宏 杨校锋 刘智勇 李玉虎 李启厚. 制备方法对臭葱石浸出稳定性的影响[J]. 过程工程学报, 2015, 15(3): 412-417.
LIU Zhi-hong YANG Xiao-feng LIU Zhi-yong LI Yu-hu LI Qi-hou. Effects of Synthesis Methods for Scorodite on Its Leaching Stability. Chin. J. Process Eng., 2015, 15(3): 412-417.
2015, Vol. 15 
