Test center procedures for dry particle sizing equipment -- What you should know
It is standard industry practice for manufacturers of size reduction and classification equipment to operate test centers for you, the customer. The general purpose of dry particle sizing tests is to identify the process equipment that meets the requirements you demand. This includes requirements for particle size, distribution of particle size, physical surface features of particles, and others. To select the appropriate mill or classifier from the variety of choices available, the test center should help you investigate both the specifications of the equipment and the characteristics of the material to be processed. Special considerations for individual applications should also be evaluated. This article discusses factors you should be aware of when having your material tested at a manufacturer's test center, prior to the purchase of size reduction and classification equipment.
The starting point for tests with dry particle sizing equipment is the product. The most important data to know is the product's hardness [expressed as Mohs value in this article] and its consistency [brittle, tough, elastic, etc.]. This data tells if it is possible to grind the product, and what general principle of size reduction should be used. Other characteristics such as moisture content, heat sensitivity, and explosivity are also considered, allowing selection of a general approach for how size reduction and classification will be achieved.