Recycled plastic (HDPE), plant, molecular sieves, mineral,…
The high efficiency of microwave drying results from the specific heat from the inside to the outside.
Vaporization of the first water molecules in the heart of the product creates a steam partial pressure which drives the surrounding water to the outside.
This mechanical dewatering effect makes "weeping" wet brick in a microwave field and decreases considerably drying energy, because only a portion of water is vaporized.
Hot air (70°C) assistance to microwave drying provides required heat energy to compensate heat loss of grain and to create simple evaporation of “dewatering” water in microwave.
The efficiency of this drying process is unmatched.
Example : recycled plastic films
The problem of waste plastic film (HDPE film) is that they must be cleaned before reuse in extruders requiring dry product.
However, plastic pieces are tight pockets of moisture and need very long time and a lot of energy to dry them.
Microwave drying assisted by hot air is particularly efficient to dry recycled plastic films.
Plastic low permittivity (HDPE 2.4) makes it almost "transparent" to microwave. Microwave is going through plastic without heating it and then can selectively excite water molecules located in the heart of the plastic tight pockets. When the first of them vaporise, it creates partial vapor pressure which opens the pockets. Water is then released and evaporated by contact with hot air.
Residual dryness in the order of 1% is compatible with the transformation process.
Example : manufacturing expanded glass grains from recycled glass
Expanded glass grain is high-range additional lightweight component for technical concrete or facade coating. It is a small diameter aggregate with high strength and thermal and acoustic insulation properties.
Grains are expanded towards 900 ° C. Heating must be very precise to avoid sticking between grains.
They are currently heated in a rotary kiln and small grains represent less than 10% of production.
With IDCO mixing technology you can have :
100% small diameter grains expanded (less than 250μm)
high quality grain (color, shape and density)
high energy efficiency
less fumes and burner combustion residues
small modular production unit
Example : very-low-level and low-level nuclear waste (sludge) or de RPIFHW
Microwaves makes it possible to operate a continuous waste vitrification directly in their container and to reach quickly the melting temperature of a glass formulation
With IDCO rotary oven technology you can have :
|homogeneous vitrified product
continuous vitrification process
directly into final container vitrification without using crucible
very low power
power components in uncontamined area (microwave-proof waveguide)
mobile unit on skid
reduction of contamined waste
Example : asbestos inerting
Structure of asbestos changed when heating between 1000 ° C and 1500 ° C and hazardous crystalline fibers become amorphous and harmless.
IDCO technology ensures homogeneous treatment.
Thanks to its expertise in expansion, IDCO propose innovative recycling of such wastes including these fibers in a clay matrix to transform them into totally inert beads after heat treatment and use them like lightweight aggregates in construction activity.