Grinding Balls is a grinding medium used to grind ore blocks in cylindrical ball mill. It is widely used in iron ore and non-ferrous metal concentrator, cement plant, thermal power plant, refractory plant, steel plant, phosphate fertilizer plant and other grinding industry. Grinding Balls grind in the block at the same time, their own wear and tear continue to become smaller, until the failure, so consumption.
At present, China consumes about 4 million tons of Grinding Balls per year, mainly for casting iron balls and forging Grinding Balls. Specifications Grinding Balls Diameter is usually used Φ20mm ~ Φ125mm, the largest ball mill used Grinding Balls Diameter Φ130mm ~ Φ150mm. Grinding Balls production process are: cast iron ball, forging Grinding Balls, rolling Grinding Balls cast iron ball Process advantages: simple equipment, low investment. Production technology and operation easy to grasp; for more specifications, small quantities of orders, arrange production easy and flexible. Process shortcomings: Casting defects (pores, trachoma, inclusions, surface, cracks, etc.); low density, small proportion; coarse metal grains, impact toughness is poor (usually 3 ~ 7J / cm2); high energy consumption, metal income Low rate; Φ40mm below the ball casting difficult.
Forging Grinding Balls Process advantages: less investment, quick start, raw materials can be used hot-rolled round bar, hot-rolled billets can also be used, the billet length is not limited, the production of easy to organize. Process defects: difficult to control the quality of production is stable; manual cutting, single different; easy to cause Grinding Balls surface folding; heating defects, oxidation and decarbonization, grain coarsening, and even overheating, over burning, heat treatment quality is unstable; Large temperature difference, quenching heat treatment of unstable quality; product hardness, hardenability and impact toughness can not guarantee stability; low efficiency, high cost. Rolling Grinding Balls Process advantages: high production efficiency, large output, suitable for large-scale modern Grinding Balls plant; rolling ball production mechanization, high degree of automation; quality and stability, Grinding Balls high hardness, poor internal and external hardness, high impact toughness, Big proportion. Technical shortcomings: a large investment in plant construction; high technological content; multi-standard, small quantities have a certain degree of difficulty, not suitable for frequent replacement of small quantities of product specifications.