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Comment PDF Solids Handling

Blending, Sampling and Segregation

By Thomas G. Troxel, Jenike & Johanson, Inc. |

Blending and segregation are two opposite and competing processes in solids handling that ideally fit the expression “two sides of the same coin.” But, if you think about it, coins have three sides and sampling completes the idiomatic expression perfectly. Blending is a necessary and essential process operation widely employed in many industries and materials, from nano-scale powders to run-of-mine ores. Segregation is almost always an unwanted consequence of handling operations that reverses the blending process or creates a need for blending where it might not otherwise be necessary if it were not for the effects of segregation. Sampling is the vitally important tool for measuring and quantifying a blend, understanding the sources and effects of segregation and for troubleshooting problems.   Blending Blending is the process of combining two or more materials to achieve a combined product. The mixture may be a combination of dissimilar materials such as cement, sand and aggregate to make concrete; or cereal flakes, raisins, nuts and marshmallows to make breakfast cereal. A blend may also be a combination of chemically similar particles blended to create a uniform mixture of particle sizes, or another property such as color,…
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