The first step in beneficiation is comminution. Typically, it is completed by series of size reduction operations: crushing and grinding. Grinding, also called fine milling or pulverizing, is the process of reducing materials to fine powder or very fine particle size. There are many types of copper ore milling machine for ore beneficiation. Grinding process is different from crushing, which reduce the big massive materials to a rock, pebble or grain size. Milling or grinding is a process to make various materials which either have its own final uses or could be as raw materials or additives for manufacturing other products.
There are many types of copper ore milling equipment and milling technics involving in the copper grinding process and beneficiation process. As a world famous manufacturer and supplier of crushing and grinding plant, Zenith provides high quality copper grinding mills for sale. Here are four popular and often used ore milling technics.
Ball mills: there are grinding media such as metal pebble or ceramic in the milling chamber. The copper materials are fed into the milling chamber, which is in rapid motion by rotational or vibration energy. This enables very drastic particle size reduction in a very short time and can be operated in wet or dry conditions.
Mechanical or hammer mills: the milling force comes from a rotor with blades and pins etc. moving at high peripheral speed (around 100 m/s). Graphite particles are ground by the impact with the blades and by collisions between each other and with the inner liner of the mill.
Air-jet mills: particles are accelerated by air jets and comminution is achieved by collisions between the particles or against a target.
Final particle size control: sieving is not suitable for industrial level when requiring ultrafine products, so the final particle size and the amount of fine products are controlled by means of air classifiers with a rotating wheel. In the case of hammer or jet mills, such devices are integrated in the mill. A reduced fraction of fines can be good for the final application, like in motor carbon brush and batteries. In this case, special classifiers adapted to the fine particle size range (0-10 µm) have to be used in a separate processing step after milling.