Effects of Temperature and pH on the Transformation of Ferric Arsenate to Scorodite in Acidic Solution

Kuan Ling Wang; Yong Feng Jia

doi:10.4028/www.scientific.net/AMR.726-731.2165

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 726-731Effects of Temperature and pH on the...

Effects of Temperature and pH on the Transformation of Ferric Arsenate to Scorodite in Acidic Solution

Abstract:

Scorodite is an important arsenic carrier for the immobilization of arsenic generated in the metallurgical industries. The transformation of the amorphous ferric arsenate into scorodite was investigated in a mixed sulfate media (pH 1-2) and elevated temperature (80-95 °C). This transformation process has been traced via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Thus, it was found that lower pH and higher temperature was favored to generate more stable scorodite. The scorodite with TCLP leachability of 3.58 mg/L As was produced at 95 °C and initial pH 1.2 for 12 h.

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Periodical:

Advanced Materials Research (Volumes 726-731)

Pages:

2165-2168

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.726-731.2165

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Online since:

August 2013

Authors:

Kuan Ling Wang*, Yong Feng Jia

Keywords:

Amorphous, Scorodite, Transformation

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