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采用常压法、水热法和改进常压法,分别在添加和不加晶种的情况下制备臭葱石,对其物相、结晶度、形貌、粒度、比表面积、Fe/As摩尔比、浸出稳定性进行表征,揭示制备方法与臭葱石组成、结构性能及浸出稳定性之间的关系.结果表明,制备方法对臭葱石组成与结构性能有显著影响,结晶度高、比表面积小和Fe/As摩尔比低的臭葱石浸出稳定性高.3种方法制备的臭葱石浸出稳定性顺序为:常压法-水热法-改进常压法.改进常压法在不加晶种条件下制备的臭葱石形貌呈由{111}晶面族包围的角锥状大颗粒晶体,结晶度为84.56%,粒度(D50)为28.2-m,比表面积为3.72 m2/g,Fe/As摩尔比为1.05;参照HJ/T300方案对其浸出稳定性进行评价,浸出10 d后,浸出液中总砷浓度仅为1.14 mg/L.
The scorodite was prepared by atmospheric pressure method, hydrothermal method and modified atmospheric pressure method. The scorodite was prepared with or without seed crystals. The phase, crystallinity, morphology, particle size, specific surface area, Fe / As molar The results show that the preparation method has a significant effect on the composition and structural properties of scorodite, the crystallinity is high, the ratio is higher than that of scorodite, The surface area is small and Fe / As molar ratio of scorodstone extraction stability is high.The three kinds of preparation scorodite leaching stability sequence: atmospheric pressure method - hydrothermal method - improved atmospheric pressure method to improve the atmospheric pressure method The scorodstone formed by the absence of seed crystals was a pyramidal large-granular crystal surrounded by the {111} crystal family with a crystallinity of 84.56%, a particle size (D50) of 28.2-m and a specific surface area of 3.72 m2 / g and Fe / As molar ratio of 1.05. The leaching stability was evaluated by reference to HJ / T300 protocol. After leaching for 10 days, the total arsenic concentration in leachate was only 1.14 mg / L.