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