Industrial Aluminum Hazardous Waste As A
New Raw Material For Zeolite Synthesis
Author(s)
A. López-Delgado, O. Rodríguez, I. Padilla, R. Galindo &
S. López-Andrés
Abstract
In Spain, the secondary aluminum industry is a mature activity which produces
35% of the total aluminum production. This industry generates slag (black dross)
with a valuable content of aluminum which is recovered by dry milling processes
in the aluminum tertiary industry. The powdered fine solid is trapped in the
sleeve filter suction system of the aluminum slag milling process. This solid is
considered as a hazardous waste within the 10 03 21 group in the European
Waste Catalogue (EWC), because of the very fine grain size (x50 < 50 μm) and
the presence of dangerous substances (metallic aluminum, AlN, heavy
metals, etc.). The high aluminum nitride content, ranging between 2 and 24%, is
remarkable and it releases ammonia gas in the presence of environmental
humidity. The aim of this work was to evaluate the complete recovery of the fine
powders coming from the sleeve filters in the aluminum tertiary industry, as a
zeolite. Two types of zeolite, analcime and NaP were obtained by hydrothermal
processes from the aluminum waste and silica as raw materials. Different
compositions of wastes and parameters such as time and temperature were
assayed to study their effects on the obtained zeolites. The materials were
characterized by X-ray diffraction and scanning electron microscopy.
Keywords: aluminum hazardous waste, recycling, zeolite, analcime, NaP.
Keywords
aluminum hazardous waste, recycling, zeolite, analcime, NaP.
Related Book
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