Consolidation Recovery Of Rare/hazardous
Elements From Polluted Water By
The Hydrothermal Mineralization Process
Author(s)
H. Itoh, R. Sasai & T. Itakura
Abstract
Detoxification of polluted water is required in many fields of industrial or
agricultural production processes. Not only removal of rare/hazardous elements,
but also the recovery and effective use of such elements is essential to increase
the resource circulation efficiency. Recycling technology of rare metals and
hazardous elements from polluted water would bring about our clean and
environmentally benign society. The hydrothermal mineralization process is one
of the best candidate techniques to meet the above demand. In the present work,
we investigated the consolidation recovery of rare/hazardous inorganic
compounds containing B, F, P, Cr, As, Sb, etc. The model wastewaters
containing the above elements with various concentrations were treated in
autoclave under the hydrothermal temperatures of 100-200oC using Ca(OH)2 or
CaCl2 as the mineralizer. Corresponding minerals, such as CaB2O5･H2O, CaF2,
Ca5(PO4)3(OH), Ca2CrO4, Ca5(AsO4)3(OH), Ca2(Sb2O7), were consolidated and
separated by filtration after the treatments. Solid/liquid separation under
hydrothermal equilibrium was found to be very effective for increasing the yield
of minerals, because the final concentration in liquid is determined by the
solubility of the mineral under the hydrothermal condition. As a result, the
concentration of every residual element in liquid decreased below the National
Effluent Standard of Japan. The recovered minerals can be supplied as raw
materials for the refining process of ordinary minerals. Such a geo-mimetic
wastewater treatment method will be applied to the detoxification and recovery
of many kinds of rare/hazardous elements in wastewater.
Keywords
hydrothermal mineralization, rare metals, hazardous elements, wastewater, resource recovery
Related Book
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