title: [Structural changes in mineral phases and environmental release behavior of arsenic during sintering of arsenic-containing waste].
abstract: An experimental work was carried out to investigate the effect of sintering temperature on arsenic volatility, arsenic leaching of the sinter and structural changes in mineral phases of arsenic in the sinter. The raw materials were shaped under the pressure of 10 MPa and sintered at 1 000-1 350 degrees C for 60 min with the air flow rate of 2 000 mL x min(-1). The results showed that there was little impact between the volatilization of arsenic before and after sintering, and arsenic fixed-rate remained above 90%, however, the sintering temperature had an important influence on the leaching concentration of arsenic. When sintering temperature was lower than 1 000 degrees C, FeAsS was oxidized into calcium arsenate, aluminum arsenate, and iron-arsenate. Ca3 (AsO4)2 was the main compound, and the release of arsenic leaching was high. When sintering temperature was up to 1 200 degrees C, the arsenic was surrounded by a glass matrix and became chemically bonded inside the matrix. Arsenates can be converted into silicoarsenates during sintering, which led to the leaching of arsenic was significantly lower. Considering the product's environmental safety, the best sintering temperature was 1 200 degrees C.
authors: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. xingrunwang@gmail.com
authors: Xing-Run
authors: XR
authors: Wang
authors: Ze-Xi
authors: ZX
authors: Nong
authors: Qi
authors: Q
authors: Wang
mesh_terms: D001151:Arsenic / Q000032:analysis* / Q000737:chemistry*; D002681:China; D004784:Environmental Monitoring; D006358:Hot Temperature; D007220:Industrial Waste / Q000032:analysis*; D008670:Metals; D008903:Minerals / Q000032:analysis*; D008906:Mining; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*
chemical_list: D007220:Industrial Waste; D008670:Metals; D008903:Minerals; D001151:Arsenic