The Advanced Mineral Recovery Technology is highly
innovative. The innovation is related to its ability to effectively treat
dusty raw materials without significant dust content in the off-gases.
In order to understand this innovation, it is necessary to compare the
operation of a typical electric arc reduction furnace with the one of the
Advanced Mineral Recovery Technology.
Open Arc Operation:
the solid charge is fed between the three electrodes and also directly into the “arc zones” of each electrode, where flash
smelting takes place and therefore the reduction reactions occur in the
melt. In this case, a hot solid charge layer floating over the slag does not
Therefore the AMRT furnace can efficiently treat dusty raw
materials. It has been recorded that less than 5% of the AMRT furnace dusty
charge is passed to the off-gases, giving a good indication of the
efficiency of this technology.
The AMRT melt reduction furnace has the capability of processing finely
sized materials, notably below 10mm in particle size, at rates up to 10 000
tons per month involving single or multiple furnace units ranging from 2 MVA
to 10 MVA electrical power rating per unit. Every furnace unit is easy to
operate and maintain where power input is optimally controlled using a
unique digitally-based PLC control system whose parameters are pre-set to be
specific to the particular type of material that is being smelted.
Their relatively small size renders them quite mobile, plus
their high adaptability to various types of materials, means that they can
be set up and made fully operational close to the site where a material to
be processed is located and this in a short space of time. All that is
required is an adequate electrical power supply. Note that the AMRT melt
reduction furnace operates in AC (and not DC) mode.
Although the main focus of the application of AMRT melt
reduction technology is in the conversion of environmentally problematic
materials into products that are both inert and have commercial value,
virgin materials, such as concentrates derived from current mining
operations, can also be processed.
AMRT’s furnace units are characterized by high-speed chemical
reaction rates at high electrical energy efficiencies.