... fly-ash, evenly distributed heat and stable quality.Ball press is widely used in metallurgy, mining, coal, refractory, ... abrasive, fertilizer, ceramics, etc. Ball press machine feature:1. High efficiency2. Apply for many kinds of powder ... , high strength, and high hardnessBall press machine working principle:1. Charcoal ball press can press charcoal powder, charcoal dust, coal powder ...