www.PowderProcess.net - Online handbook for Engineers

Your site of reference for Powder and Solids processing

Discover below the content of the free online handbook

What is www.PowderProcess.net ?

www.PowderProcess.net is a free online handbook giving explanations on the most common unit operations and equipment found in Industries processing powders.

It gives materials for Engineers who, around the world, have to design, operate or troubleshoot a powder handling process.

Would you be a confirmed Engineer, a new graduate looking for information on the process he has 1st to work on, or a student, please access below articles on unit operations and equipment that, we hope, will be useful for you. www.PowderProcess.net also hosts Process Engineer's Tools, a new online ressource for Process Engineers, not limited to Powder Processing - This subsite is still in development.

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Shear / Centrifugal MixersTumbler mixers
Powder properties Unit operations Equipment handbook
Powder Properties
Flow of solids
Mass and funnel flow silos
Particle density
Bulk Density
Skeletal density
Particle Size Distribution (PSD)
Froude number Homogeneity
Segregation (demixing)
Dosing and weighing
Pneumatic Conveying
Solid Gas Separation
Grinding and Milling
Solid Liquid Suspension
Checking (sieve and magnets)
Big Bag Tipping Stations
Vibrating Sieve
Airlock rotary Valve
Conveying Pipe
Pipe Diverters
Rotary Valves (pneumatic)
Vibrating Tube
Screw Conveyor
Load Cells
Paddle Mixers
Ribbon Blenders

Powder Handling Unit Operations

Feel free to navigate through the site and find explanations, drawings, calculations about key powder handling unit operations. Just click on the icons to access the corresponding pages.

Powder properties

Key powder properties explained, Powder flowability, Methods to get flowability parameters, flow functions, electrostatics...and more

Powder flow

Flow out of silo, silo design procedure, promotion of flow by discharging aids, importance of air balancing... and more

Powder Checking

Foreign body detection and separation with vibrating sieve, magnets, metal detectors principle and key design aspects of equipment removing Foreign Bodies... and more

Pneumatic conveying

Pneumatic conveying principle, main technologies available, troubleshooting tips and basic design method... and more

Solid-Gas separation

Main Solid Gas separation technologies, cyclones, scrubbers and filters working principle, pros and cons... and more

Grinding - Milling

All type of grinders and mills, milling principles, choice of the right mill... and more


Main dosing equipment, dosing Gain-In-Weight or Loss-In-Weight, tips for a good dosing... and more


What is mixing, Froude Number, the main mixer types, batch vs continuous... and more

Solid Liquid Suspension

Mixing of liquid and solid, slurry, rheology properties of solid / liquid suspension, settling of suspensions... and more


Big Bag filling, filling machines... and more

Safety (ATEX)

Dust explosion risks, how to avoid it, how to manage it, principles of ATEX study... and more

Equipment Handbook

Feel free to navigate through the site and find explanations, drawings, tips about the key equipment found in solids handling processes. Just click on the icons to access the corresponding pages.

Big Bag tipping station

Tipping of Big Bags safely, fast and without dust emission.


Air mover for pneumatic conveying. Reaching right level of volumetric throughput and pressure.

Conveying pipes

Piping for pneumatic transport, with the right pipe connections according to the need.


Air - solid separations at any point of the process where air needs to be vented or admitted, gas to cloth ratio for filters shortcut sizing.

Load Cells

Weight measurement for dosing, stock control or only for indication. Explanation of key performance parameters of load cells.


Protection against foreign bodies by trapping metal particles


Adding value by mixing different solids together, reaching a desired homogeneity. Focus on convective (with agitator) mixers.

Pipe diverters

Reaching different destinations with one conveying line

Screw conveyors

Dosing and conveying by mechanical means. Design characteristics of efficient and safe screw feeder.

Rotary valves

Specifically designed pneumatic activated valves for dosing purposes. Principle of aspiration, sizing criteria...

Star Valve (airlock rotary feeder)

Bringing powder from one zone of pressure to another, especially for pneumatic transport

Vibrating sieve

Protecting the process against foreign bodies larger than a certain size

Vibrating tube

Dosing and transporting solids thanks to controlled vibrations

Process Engineer's Tools (beta)

Process Engineer's Tools is a subsite of www.powderprocess.net widening the ressources available to the whole Process Engineering art. The subsite is still in development, stay connected for following the updates !

Fluid Mechanics

Pressure drop, pump sizing, valve sizing, laminar flow, turbulent flow, newtonian and non newtonian fluids... and more

Heat Transfer

Heat balances, heat exchanger calculation, fire heaters... and more

Agitation - Mixing

Mixing in tanks, agitator type and motor sizing, mixing of liquids, mixing of liquids and solids, mixing of liquids and gas... and more

Reaction Engineering

Mass balances, reaction kinetics, reaction order... and more


Generation of compressed air, refrigerated water, chilled water, purified water, steam, air handling... and more


All the right design principes and tools to design a safe installation... and more

About us

PowderProcess.net has been built specifically for the professional having to deal with industrial Powder Processes, either regularly or occasionally

The content is built from the expertise of the author who has 10 years of experience in the field of Process Engineering and especially Powder Processes

More information

Get in touch

You can contact us at the following email adress : powder.process@protonmail.com

You can : ask technical questions, make suggestion, signal problems or need of correction of the articles