Laminar Flow Pumps-Air Classification

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Air Classification

“Industrial up-take of air classification "

Air classification has yet to be taken up in any significant way by the UK aggregates industry. It is used by some aggregate companies, for the production of higher-value industrial mineral products, such as mineral fillers, dry silo mortar and cement. This is particularly the case with limestone quarries and a few sandstone quarries. However, the higher value of these products enables the use of higher-cost processing options.

Key finding
The most likely use of air classification in the UK quarrying industry will be for the removal of material finer than 63 microns from fine aggregate or quarry fines to produce manufactured sand. This is already the case in some quarrying operations in the USA.

The motivation for using air classification, rather than the more traditional wet processing option, will be the increasingly restricted access to water, and the costs of mitigating the environmental impacts associated with its use. Currently, there is a widely held perception that air classification is an expensive process to install and operate, particularly as there is a need to dry material before it can be processed. The future development of more efficient drying technology will reduce the costs of drying.

http://www.goodquarry.com/article.aspx?id=158&navid=19#ac

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