Powder and Bulk Engineering
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Powder and Bulk Engineering is a technical publication devoted to readers in the bulk solids market, worldwide.
Test Centers
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Publication Date: 04/2006
Pages: 5
PDF Format
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Test center: Let them test filter cake

A supplier's solids test center helps a chemical company choose the right vertical mixer-dryer for removing solvent from a centrifuge filter cake.

A specialty chemicals company located in the Midwest produces a powder additive used in the paper industry. To make the additive, the company dries a centrifuge filter cake containing about 15 percent toluene (a solvent) to less than 0.1 percent toluene. In the past, the company used a 3,000-liter-capacity conical screw (Nauta) mixer-dryer to remove the excess solvent from the filter cake. However, as the filter cake dries it becomes very dense, increasing the torque required to move the mixer-dryer's rotating orbiting screw through the filter cake. Because of this, the screw would fail after about 6 to 12 months of use and need to be replaced, which increased production downtime as well as maintenance and production costs. While searching for a solution to this problem, the company worked with a Germany-based vertical mixer-dryer supplier, conducting material and equipment tests at the supplier's European test center.

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