Abstract:The carbonation of asbestos-containing waste slate using a direct aqueous mineral carbonation method was evaluated. Leaching and carbonation tests were conducted on asbestos-containing waste slate using ammonium salt (CH3COONH4, NH4NO3, and NH4HSO4) solutions at various concentrations. The CH3COONH4 solution had the highest Ca-leaching efficiency (17%-35%) and the NH4HSO4 solution had the highest Mg-leaching efficiency (7%-24%) at various solid dosages and solvent concentrations. The CaCO3 content of the reacted materials based on thermogravimetric analysis (TGA) was approximately 10%-17% higher than that of the as-received material for the 1 M CH3COONH4 and the 1 M NH4HSO4 solutions. The carbonates were precipitated on the surface of chrysotile, which was contained in the waste slate reacted with CO2. These results imply that CO2 can be sequestered by a direct aqueous mineral carbonation using waste slate.
A ceramic filter coated with a reactive material has a high thermal and chemical stability and can be used to treat wastewater under extreme conditions. With the aim of enhancing the reactivity of conventional ceramic materials, the feasibility of incorporating an iron material as the reactive material into conventional ceramic materials was evaluated. Reactive ceramic pellets were synthesized by mixing zero-valent iron (ZVI) with conventional ceramic materials composed of primarily alumina in order to enhance the reactivity of the conventional ceramic materials. To evaluate the removal of As(III), As(V), and Cr(VI) from aqueous solutions, batch sorption tests were conducted under various conditions (i.e., pH and solid-to-liquid ratio) using synthesized ceramic pellets incorporating various iron contents and ZVI and aluminum oxide (Al 2 O 3) as reference materials. Results show that ZVI had a higher sorption capacity than Al 2 O 3 under acidic conditions, and the adsorption capacity of synthesized ceramic pellets for As and Cr increased when the iron content of the synthesized ceramic pellets increased. These results indicate that the addition of iron materials into conventional ceramic materials can enhance the reactivity of the conventional ceramic material for removal of As and Cr from aqueous solutions.
This article presents data on characteristics of waste foundry dust (WFD), sorbent obtained before and after batch sorption tests using As(III) and Cr(VI) aqueous solutions, by performing X-ray Diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) coupled with energy dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) analyses. Data are related to a research article “Waste foundry dust (WFD) as a reactive material for removing As(III) and Cr(VI) from aqueous solutions”
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. The data provide information obtained from various analytical methods to investigate mechanisms of As(III) and Cr(VI) removal from aqueous solutions by WFD, an industrial by-product. These data can be of interest to researchers studying contaminant removal mechanisms by reactive materials, in particular industrial by-products.
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