Recycling Possibilities Of Spent Potlining
From The Aluminum Industry
Author(s)
N. Samec, D. Mikša & F. Kokalj
Abstract
Spent potlining (SPL) from aluminum reduction cell cathodes presents a major
environmental concern in the primary aluminum industry. After laboratory tests
it has been found that leaching cyanide and fluoride compounds present a major
problem of SPL disposal. On the basis of the laboratory investigations, the
possibilities of material and energy utilization of SPL have been studied. It has
been concluded that SPL refractory material can be utilized directly in red brick
manufacturing. A pilot test of the energy utilization of 25 tonnes of SPL carbon
waste mixed with green petrol coke in a cement kiln has been performed.
Additionally, the energy utilization possibility of SPL carbon waste in a coal
thermal power plant have been investigated.
Keywords: re-use, spent potlining (SPL), red bricks industry, cement industry,
co-combustion in thermal power plant.
1 Introduction
Aluminum is produced by the electrochemical reduction of alumina dissolved in
fused cryolite (Na3AlF6) at temperature of 950 °C. This process is called the
Hall-Heroult process, named after its inventors. It is the only method applied
nowadays for industrial primary aluminum production.
At the end of the electrolysis cell (Figure 1) lifetime every 5 to 8 years it has
to be shut down. Apart from the anodes, the bath, the metal and the bars, the
material left is the cathode and is composed of:
• 55 % carbon cathode (referred also as "first cut"),
• 45 % refractory material (termed also as "second cut").
Keywords
re-use, spent potlining (SPL), red bricks industry, cement industry,
co-combustion in thermal power plant.
Related Book
Other papers in this volume
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