Pug Mills Increase the Strength of Filters

Pug mills really do increase the strength of our filters. At our facility in Yunnan China, we did an experiment where we made 12 blocks as we usually do (banging them on the floor) and each weighing 8.6kg (as usual).

Derek Chitwood wrote…

“Pug mills really do increase the strength of our filters. At our facility in Yunnan China, we did an experiment where we made 12 blocks as we usually do (banging them on the floor) and each weighing 8.6kg (as usual). In the next set of 12 we added 0.2kg to each block (8.8 kg) thinking that the extra material would cause extra compression – and work like a pug mill in effect. Our 3rd set of 12 had an extra 0.4kg in each block (9.0kg) – that was a lot of waste and frustrating for the technician. Then the 4th set of 12 had all the clay first go through a pug mill once and then was made into normal 8.6kg blocks (as usual – pounding them on the ground). The results where that the crack point of our filters increased about 9%. “  See the figure:
— in Kunming, Yunnan, China.

Data courtesy of Derek Chitwood

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