Ball mill is widely suitable for ore dressing, chemical, coal, cement, and refractory to operate fine grinding.
Ball mill can specify ball mill as Wet grate rolling bearing energy ball mill, Overflow ball mill, Grate ball mill, Wet rod mill, Wet cone ball mill.
The first kind of ball mill is the most popular ones in our gold mining plant.
When asking for a quotation about a ball mill, the customer should confirm with the supplier if the price includes grinding balls or not. The price would be much different if this detail is not classified.
Ball mill is the key equipment to crush the material after the first crushing. It is filled with a certain number of steel balls as a grinding medium in its cylinder.
As one of the most variable and effective machines to reduce the size of materials, it is widely used in cement, silicate products, new building materials, refractories, chemical fertilizer, black and non-ferrous metal mineral processing, glass ceramics and other production industries, dry or wet grinding of various ores and other grindable materials. Ball mill is suitable for grinding all kinds of ores and other materials. It is widely used in mineral processing, building materials, and the chemical industry. The applicable minerals for this machine are gold, chromium, tin, tantalum, diamond, silica sand, etc.
Types of Ball Mills
Ball mills can be divided into dry grinding and wet grinding.
And according to the different ways of ore discharge, it can be divided into lattice and overflow types.
Lattice Ball Mill
According to different grinding methods, ball mills can be divided into dry and wet ball mills. Similarly, Lattice Ball Mills are also divided into wet Lattice Ball Mills, dry Lattice Ball Mills, and energy-saving Lattice Ball Mills.
Among them, the energy-saving lattice ball mill is improved equipment. Technical innovation is carried out based on the original equipment. The grooved annular liner is adopted to increase the contact area of the ball ore, strengthen the grinding function, and reduce energy consumption. The energy-saving can reach 20%~30 %.
Structure of Wet Energy-saving Lattice Ball Mill
Overflow Ball Mill
Overflow ball mill is a kind of mineral processing ball mill. Its name comes from its discharge mode. The discharge mode of the overflow ball mill is non forced discharge. Only when the pressure in the cylinder reaches a certain degree, and the slurry is higher than the lower edge of the hollow shaft at the discharge end will it flow out automatically. Therefore, it is more suitable for two-stage grinding with fine grinding fineness. The mill discharge is since the diameter of the hollow shaft at the discharge end is slightly larger than that at the feed end, resulting in a certain inclination of the pulp in the mill towards the discharge end. When the pulp surface height is higher than the lowest inner diameter of the discharge port, the pulp will overflow out of the mill. This is a non-forced high-level discharge; discharge speed is slow, so the retention time of ore in the machine is long, the effective role of the medium is low. So overflow type ball mill over grinding is serious, the processing capacity is also lower than the same specification of lattice type. It is generally suitable for fine grinding or second grinding in two-stage grinding.
The main part of the overflow ball mill is a cylinder with a small diameter and large length. In addition to the cylinder, the structure of the equipment also includes the cylinder, feeding part, discharging part, transmission part, main bearing, circulating lubrication system, and so on.
When the ball mill starts, the transmission device drives the cylinder to rotate slowly. The material to be ground is fed from the feeding end. In the cylinder, the material is crushed due to the impact and grinding of the steel ball and the material itself. In this process, the feeding end is continuously feeding, and the material will be gradually squeezed from the feeding end to the discharging end due to pressure. The material reaching the finished product size will discharge, and the steel ball and coarse ore block return to the mill to continue grinding.
Advantages and Features
Overflow Ball Mill Features
Easy to start with a gas clutch for a flexible start.
Stable and reliable operation with static and dynamic pressure bearing.
Oil mist lubrication device ensures reliable lubrication of big and small gears.
Slow transmission, it’s easy to repair and start.
The structure is simple and convenient for maintenance.
The lining plate is optional and has high wear resistance
The working mode is various(dry grinding, wet grinding, or mixed fine grinding), and the granularity is optional.
The material of the cylinder is reliable, and the performance of parts is advanced. The barrel of the overflow ball mill is made of steel plate with a thickness of 15-36mm by welding.
Low labor intensity, saving workforce.
Lattice Ball Mill Features
Fast discharge speed, large output, higher output than overflow ball mill with the same specification.
The shell of a lattice ball mill can choose a wear-resistant rubber lining plate according to the properties of grinding materials, which has good wear resistance and longer service life.
Good grinding effect. The steel balls in the cylinder are composed of a variety of balls with different diameters. When the ball is lifted to a certain height, it will fall to improve the grinding effect.
Using dynamic and static pressure bearing, the equipment runs smoothly and reliably.
Slow start, easy to repair the equipment at any time, and reduce the energy consumption at the moment of start-up.