All Blog Posts about ‘Question of the Week’

Question of the Week: How does a Rotary Kiln Work?

This article was co-authored by:

Carrie Carlson
Technical Writer

Process and Sales Engineer
Thermal Processing Expert

The interior of a rotary kiln.

Rotary kilns use extremely high temperatures combined with controlled retention times to cause a chemical reaction or phase change in a material. At certain temperatures (different per each material), a material will undergo a chemical reaction or phase change. This is often necessary to bring Continue reading →

 

Question of the Week: What are Common Paddle Mixer Applications?

This article was authored by:

Jenny Seim
Technical Writer

Common Pugmill Mixer (Pug Mill, Paddle Mixer) Applications

Paddle mixers are relatively flexible devices, able to mix, condition, and agglomerate a diverse range of bulk solid materials. They are also adept at processing both liquid and solid feeds, and can be used as stand-alone pieces of equipment, or prior to processing in a Continue reading →

 

Question of the Week: What are the Variables to Consider when Operating a Pan Pelletizer?

This article was authored by:

Jenny Seim
Technical Writer

Disc Pelletizer (Pelletiser, Pan Granulator) in Operation

Pan pelletizer operation is oftentimes considered an art because of the many mechanical and process variables that must be properly combined to achieve the desired pellet characteristics. A trained operator is necessary to create the most efficient pelletization process, and the most ideal end-product. The Continue reading →

 

Question of the Week: What are Indirect Coolers Used for?

This article was co-authored by:

Carrie Carlson
Technical Writer

Shane Le Capitaine
Thermal Processing Expert

What are Indirect Coolers Used For

While indirect coolers are used far less commonly than their direct cooling counterparts, they are often the best solution in a few specialty applications. A direct cooler relies on direct contact between the material and chilled air in order to cool the material, which can Continue reading →

 

Question of the Week: What Causes Refractory Failure in a Rotary Kiln?

This article was authored by:

Jenny Seim
Technical Writer

What Causes Refractory Failure in a Rotary Kiln

Cycling and chemical incompatibility are the two main causes of refractory failure in a rotary kiln. Cycling Cycling is the heating up and cooling down of a rotary kiln, and it is the largest source of refractory failure. Refractory expands with the kiln as it Continue reading →

 

Question of the Week: What is Heat Setting?

This article was authored by:

Jenny Seim
Technical Writer

What is Heat Setting?

Rotary kilns use heat to cause a physical change or chemical reaction in a particular material, and can be utilized to carry out a variety of processes. One of the more common processes carried out in a rotary kiln is heat setting. This refers to the act of Continue reading →

 

Question of the Week: What Causes Rotary Dryer Misalignment?

This article was authored by:

Jenny Seim
Technical Writer

What Causes Rotary Dryer (Drier) Misalignment, Image of Worn Rotary Dryer Tire (Tyre)

Rotary dryer misalignment is oftentimes the result of improper base installation. Misalignment in the base will quickly spread through the rest of the drum, causing wear and damage to other drum components. In addition, misalignment can occur naturally over time as part of normal rotary Continue reading →

 

Question of the Week: What is Synthetic Gypsum?

This article was authored by:

Jenny Seim
Technical Writer

Synthetic Gypsum pellets, pelletized (pelletised) synthetic gypsum

Synthetic gypsum is the name used to classify a variety of by-products that can serve as an alternative to natural gypsum.  The most common gypsum by-product is FGD gypsum, formed from coal-fired power plants, though synthetic gypsum can also be generated through various acid-neutralizing processes. Continue reading →

 

Question of the Week: What are the Challenges in Processing Phosphates?

This article was authored by:

Jenny Seim
Technical Writer

Challenges in Processing Phosphates

Similar with any mineral, phosphates can present challenges during processing. The following looks at the common material characteristics that may cause such challenges when working with phosphates. Abrasiveness. Phosphates can range from slightly to tremendously abrasive, depending on what form they are in. Abrasive materials Continue reading →

 

Photo of the Week: Washboarding on a Rotary Drum Tire

This article was authored by:

Jenny Seim
Technical Writer

Rotary Drum Tire (Tyre) Washboarding, Drum Tire in Need of Tire Grinding

This week’s photo highlights washboarding on a rotary drum tire. Washboarding is indicated by the vertical grooves that extend the length of the tire, and it is caused by abnormal skewing of the trunnion wheels, or trunnion wheel mis-alignment. FEECO offers a tire grinding service Continue reading →

 


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