A ball mill is a type of grinder used to grind materials into extremely fine powder for use in mineral dressing processes, paints, pyrotechnics, and ceramics.. description. a ball mill, a type of grinder , is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials.Apr 01, ball mill is that the key machine to grind the crushed materials. the ball mill machine is wide accustomed method cement, salt product, building material, refractory material, fertilizer, ceramics, and glass, etc. the ball mill, also known as the rod mill, will work in a dry manner or wet way. you choose the operating way of a little ball mill.