... good hard,mohs'8 3)Size:2-4,4-6,6-8,8-10,10-15cm Natural pebbles for grinding ball in ball ... mill1.Product:Pebbles/Silica pebbles/Natural pebbles2.Size:2-4cm,4-6cm,6-8cm,8-10cm,10-12cm,12 ... 608.to produce 1,000 kg of ceramic body,between 4 and 5 kg of pebbles will be necessary Dalian ... 0086-411-82741622FAX:0086-411-82741722Http:www.gtdl.com.cn Natural Pebbles as Grinding Media for Ball mill