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raw materials for slate pencils

40 Best Slate Pencils images Slate board Slate Natural Lead of mechanical pencils Raw material for Spare Leads The first was the sintering of the clay which is the main raw material the graphite and the binder as well as the pencil core However it was not possible to obtain enough strength when the core diameter was thinned and it was about 1 0 1 5 mm... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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