Chemical Engineering April 2020 - 30

* Nitrogen, phosphorus, potassium
(NPK) fertilizers
FIGURE 4. The interior of this pin mixer, including the shaftin-trough
arrangement, can be seen during fabrication
When used as an intermediate
step within a larger process, pelletizing
is also used to control granule
properties, such as heat transfer,
porosity and density, in order
to maximize performance during
downstream processing.
Enhanced appearance. Pelletizing
is frequently used as a means of improving
product appearance. Granules
can be produced to be round,
smooth and uniform, transforming a
regular product into a premium one,
with improved flowability, uniformity
Call the
Solids Mixing
Ribbon & Cone Blenders
Fluidizing Mixers
Sigma Blade Mixers
(also for high-viscosity mixing)
Size Reduction
Wet & Dry Size Reduction
Steel & Ceramic Lined Mills
Jars & Jar Rolling Mills
Vacuum Drying
Dryers & Complete Systems
FIGURE 5. Disc pelletizers, such as the one
shown here, have a rotating disc mounted to
a stationary base
in size, and less attrition. For this reason,
pelletizing is widely used in the
fertilizer and soil-amendment industries
for high-value products.
Commonly pelletized materials.
Pelletizing can potentially benefit any bulk
solid material that presents handling, application,
or performance challenges
as a result of its particle characteristics.
Solid materials that are frequently pelletized
include the following:
* Crushed gypsum (natural or synthetic;
Figure 2)
* Crushed limestone
for all your solids processing
Experts
Applications:
APIs ∙ Ag-Chemicals
Biologics ∙ Catalysts
Ceramics ∙ Chemicals
Food Ingredients
Herbicides ∙ Minerals
Nutraceuticals ∙ Pesticides
Pharmaceuticals ∙ Pigments
Polymers ∙ Powdered Metals
Proteins ∙ Resins ∙ Vitamins
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* Soil amendments
* Flyash
* Iron ore
* Alumina
* Glass
* Silica
* Clays and ceramics
* Electric arc furnace (EAF) dust
* Soda ash
* Carbon black
* Biosolids/manures
* Titanium dioxide (TiO2)
* Zinc oxide
PELLETIZING PROCESS
Pelletizing is a non-pressure (also
referred to as tumble-growth or
agitation) agglomeration technique,
meaning that a liquid binder and
tumbling action are employed to
facilitate the formation of granules.
This agglomeration technique differs
from pressure-agglomeration
methods, which use extreme pressure
to cause powder materials to
self-adhere into a desired form. Not
Q ual
191
ity &
Since
1
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Chemical Engineering April 2020

Table of Contents for the Digital Edition of Chemical Engineering April 2020
