Steel Slag as Neutralization-Adsorption Material for Treatment of Acidic Zn2+ - Containing Wastewater

Hui Fen Yang; Qi Feng Ou; Feng Zhou

doi:10.4028/www.scientific.net/AMR.383-390.3416

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 383-390Steel Slag as Neutralization-Adsorption Material...

Steel Slag as Neutralization-Adsorption Material for Treatment of Acidic Zn²⁺ - Containing Wastewater

Abstract:

Chemical and mineral compositions, the surface morphology of steel slag were evaluated in this study. On this basis, treatment effect of acidic Zn²⁺-containing wastewater was investigated using the slag as a water treatment material, and then mechanism of removal Zn²⁺ was discussed. The results showed steel slag was a suitable material for treatment of acidic heavy mental wastewater. Under conditions of slag size fraction of -1.2+0.15mm, slag concentration of 30 g∙L^-1, stirring speed of 150rpm for 30 min, removal rate of Zn²⁺ was 98.59%, Zn²⁺ concentration in wastewater was reduced from 100 mg/L to 1.41 mg/L, and pH value was increased from 2 to 6.4. Filtrate after treatment reached the first discharge standard in integrated wastewater discharge standard (GB8978-1996). Appearance of Zn (OH)₂ diffraction peaks in XRD pattern showed that Zn (OH)2 had covered on steel slag surface, and Zn²⁺ removal included four main processes: production of OH- from hydration reaction of a_{Subscript text}ctive calcium silicate in steel slag, generation of Zn (OH)₂ precipitation in wastewater, adsorption and settlement of Zn (OH)₂ on surface of steel slag and removal of Zn (OH)₂ from wastewater by filtration.

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Periodical:

Advanced Materials Research (Volumes 383-390)

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3416-3421

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.383-390.3416

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Online since:

November 2011

Authors:

Hui Fen Yang, Qi Feng Ou, Feng Zhou

Keywords:

Acidic Wastewater, Adsorption, Filtration, Neutralization, Settlement, Steel Slag, Zn (OH)₂ Precipitation

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