Characterization of iron and steelmaking wet dust for arsenic remove in wastewaters
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Characterization of iron and steelmaking wet dust for arsenic remove in wastewaters V. Narvaez-García1, A. Martínez-Luevanos2, F. Carrillo-Pedroza3, M. Soria-Aguilar3, M. Guajardo-Castillo1, M. Chirino3, E. Castro4 1
Altos Hornos de Mexico, S.A.B, Prolongación Juarez s/n, col la Loma, Monclova, Coahuila, 25700, México 2 Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Blvd. V. Carranza y A. Cárdenas, Saltillo, Coah. Mexico 3 Facultad de Metalurgia, Universidad Autónoma de Coahuila, Carr.57 Km 5, Monclova, Coah., México. 4 CINVESTAV, Centro de Investigación Aplicada, Unidad Ramos Arizpe,Ramos Arizpe Coah.,E-mail: [email protected]. ABSTRACT Dust originated from the iron and steelmaking containing undesirable compounds are not completely recycled because affects the process efficiency. These types of dust represents an economical lost as a consequence of values contents. However, dust have been characterized physically and chemically in order to study their potential environmental applications, as the removal of arsenic in wastewater. The results shows that dust have a superficial specific area between 16 and 20 m2/g, values considered high, typical of a material with adsorbent properties. Representative results of different tests adsorption of arsenic in the material described indicate that it is possible to reduce the arsenic levels in up to 95% from an initial concentration of 1 mg/L of total arsenic. The results indicate that the iron and steelmaking wet dust may represent a new option as material for the removal of heavy metals in water treatment. INTRODUCTION The steel and ironmaking industry processes generates several sub-products and residues that are or could be recycled or reused in to the productive process. Some of those residues are the dust from the gas cleaning system of the Blast Furnace and the dust from Basic Oxygen Furnace process; such dusts are sent to the sedimentary lagoons. The dusts or Fe-residues represent a loss of 2 % of the total iron and coal mineral contained in mineral feed to the process. The iron content of residues became them susceptible to be agglomerated and feed to the blast furnace. But the high content of zinc does not allow recycling it into the process [1]. Then, Feresidues represent an economical lost due to of iron and carbon values. The chemical and physical composition of the Fe-residues indicates the possibility of using them as raw material for obtaining products with high added value. One potential application is the removal of heavy metals in water, such as arsenic, manganese, lead, chromium, iron, zinc and copper. Arsenic contamination of drinking water is a global problem that will likely become more apparent in future years as scientists and engineers measure the true extent of the problem. Communities in North and South America, Europe, Asia and Australia also face the problem of arsenic-contaminated drinking water. In Latin America, communities in Mexico, Chile, Bolivia,
Brazil, Peru, and Argentina are affected. In Mexico, the problem
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