Looking for an older Powder Perspectives? Find it here.
Column 1 - Published June 13, 2013
Factors That Impact a Powder’s Flowability
Moisture content, temperature, particle size, and time of storage at rest can have a tremendous impact on your material's flow properties. How your material flows is a function of its cohesive properties. As such, conditions that affect the cohesive strength of a powder will have an impact on its handling capabilities. Read the rest of the story here
Column 2 - Published June 24, 2013
Powder Perspectives: There is a Science to Powder Handling
The field of solids handling was developed mainly through the work of Dr. Andrew W. Jenike, who pioneered bulk solids flow theory. Dr. Jenike developed a scientific approach to the storage and flow of bulk solids in the 1950s that is still relevant today. In fact, the Jenike shear test is now the ASTM standard (1) in the United States and Europe for determining bulk solids’ cohesive and wall friction properties. Read the rest of the story here
When Things Go Wrong: How to Address a Solids Flow Problem
As a consultant to the bulk solids handling industry for so many years, I have been involved in numerous approaches to solids handling problems. The process usually starts problem. This typically results in the submission of a with a telephone conversation concerning a particular proposal for material testing and conceptual design recommendations. Read the rest of the story here
Column 4 - Published July 29, 2013
Storage Silo Selection for Dry Bulk Applications
The process of silo selection starts with a series of questions that require answers before proceeding. This is one of the main problems witnessed in today’s dry bulk storage market. Tank and silo selection many times is based on a preferred “construction type” in lieu of “stored material” performance requirements. Read the rest of the story here
Column 5 - Published September 5, 2013
Frequently Asked Questions - Part 1
Having been a consultant for many years, I have obviously been asked some of the same questions concerning solids flow, time and time again. Here are some more frequently asked questions and answers. 1. How can bulk solids flood or flush out of a bin? Read the rest of the story here
Column 6 - Published November 6, 2013
Handling Carbon Black and Titanium Dioxide
Carbon black and titanium dioxide (TiO2) are two of the most difficult powders to handle in bins, hoppers, and feeders. You may conclude that, as the title of this article indicates, designing a handling system for these "nasty" materials is not black and white. If you are not familiar with TiO2, it is a fine white powder that provides whiteness and opacity to paints, coatings, plastics, paper, inks, fibers and food and cosmetics.? Read the rest of the story here
Column 7 - Published January 10, 2014
Addressing Segregation Problems
This article discusses two major mechanisms of segregation; namely, sifting and fluidization segregation.
What is sifting segregation?
Sifting segregation occurs when small, fine particles move through large, coarser particles. This is the most common means for particles to separate. In order for sifting to occur, they material must be: