Spray drying involves atomization of dyestuff and pigment feedstock into a
spray of droplets, which is brought in contact with drying air. Feedstocks
can be in solution, suspension or paste form.
NIRO PLANTS AND PRODUCTS
Niro offers a broad range of technical
solutions and tailor-made applications to meet the specified product property
requirements, such as free-flowing characteristics, powder granulometry, low
dustiness and redispersion characteristics.
The Niro plants for this
industry include spray dryers, FSD dryers, IFD dryers, fluid beds for
agglomeration / granulation and mechanical granulation.
The recipe of
many dyestuffs and pigments includes hazardous organic ingredients representing
risks of fire and dust explosion or environmental pollution due to toxic or
active emissions.
Today's environmental restrictions require more
complex designs to meet the requirements of product type, powder form, and
residual moisture content in the final dried product and/or toxicity
properties.
Niro has successfully developed and supplied a number of
process plants designed to meet the requirements of our customers and the local
authorities regulations, such as:
- Open, environmentally friendly plants with highly effective components
ensuring exhaust of clean process air
- Semi closed plants utilising low oxygen combustion gas as process air
- Semi closed plants, self-inertised and featuring incineration of exhaust
air
- Closed cycle concept with Nitrogen purged process gas circuit
Cleaning-in-place (CIP) systems, semi- or fully automatic, are available for
all Niro plants.
TYPICAL SPRAY DRIED DYESTUFFS AND PIGMENTS:
- Acid dyes
- Azoic dyes
- Barium sulphate
- Basic dyes
- Cadmium carbonate
- Cadmium sulphide
- Calcium carbonate
- Ceramic colorants
- Disperse dyes
- Dyestuff intermediates
- Iron oxide (black, red, yellow)
- Kaolin
- Lead chromate (chrome yellow)
- Lead molybdate
- Lithopone
- Phthalocyanines
- Reactive dyes
- Related fillers
- Titanium dioxide
- Zinc chromate
- Zinc potassium chromate