Scrubbing
Scrubbing is the process of removing tough contaminants from sound aggregate through particle-on-particle attrition.
Why Scrubbing?
Raw aggregates must often be cleaned before they can be used in construction projects, as deleterious materials, such as clay, can be harmful to the final product. Construction aggregate specifications allow for minimal contaminants in the final gradation, so as much of the impurities must be removed as possible. Sometimes, washing is all that is required to clean the aggregate. Other times, a more aggressive scrubbing is required to remove tough, sticky clays and other contaminants that have adhered to the sound aggregate.
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Equipment for Scrubbing
Scrubbing allows producers to create a higher-quality product by removing the deleterious material, which can cause cracking, popouts and discoloration in the end-use product. Scrubbing is achieved with equipment designed to facilitate particle-on-particle attrition to remove these tough contaminants.
There are several products depending on application that can be used in the scrubbing process – Attrition Scrubbers, Blade Mills, Coarse Material Washers and Log Washers.
Attrition Scrubbers provide high intensity scrubbing for fine materials. Blade Mills liberate loamy clays from coarse product. Coarse Material Washers remove light-to-medium soluble clays and dust from aggregate materials, and Log Washers utilize heavy-duty scrubbing to remove tough, plastic-like clays through abrasion.
