Process Crusher Crushing Stones. Processing capacity:t/h. Feeding size:mm. Appliable Materials: calcite,granite,concrete,limestone,coal gangue,construction rubbish,cobblestone,basalt and all kinds of hard and soft ores with compressive strength not higher than 320 Mpa. get price now.
· Milling technology advanced further with the introduction of rotary mills. The mola asinaria which dates back 200300 BC was a basic rotary mill driven by blindfolded horses, donkeys or mules and used mainly to grind flour and corn. Sometimes it used human power and was driven by slaves. It had a horizontal axle attached to a shaft which was attached to a .