Grinding mill is a tipe of machine sued to break solid materials into tiny pieces. Various tipes of grinding mills are out there, which are used to grind different tipes of materials. In the past, mills were run by hand, animals, water and wind. Nowadays, they are powered by electricity as well. Below are different tipes of grinding mills.
Ball mill
A ball mill is a reguler tipe of grinding mill. It has a horizontal, slightly inclined silinder filled with balls of metal or stone. These balls grind materials by impact and friction with the rolling balls. Ball mills have longer length and small diameter, and have a length between 1.5 and 2.5 times its diameter. Often, ball mills are used to make cement and process minerals. The diameter of industrial ball mills is 24 feet and the motors are 22 MW. However, small versions can be seen in labs as well.
Rod mill
In rod mills, a spinning drum causes attrition and friction between ore particles and steel rods. Ball mills are more commonly used than rod mills to grind minerals.
The rods fitted in the machine are made of high-carbon steel, and these rods vary in diameter and length. If a machine has small grinding rods, it will have a bigger surface tempat, resulting in better efficiency.
Autogenous mill
Autogenous mills fitur self-grinding of its ore. In this machine, a drum rotates and throws big ore rocks in a cascading movement, which causes breakage of big rocks and grinding of fine particles. This tipe of machine doesn’t fitur steel balls.
SAG mill
SAG stands for Semi-Autogenous Grinding. Just like ball mills, these machines also have grinding balls in them. Actually, a SAG mill is used as a primary stage solution for grinding. It comes with a 28 MW motor and a diameter of 44 inches. As a matter of fact these machines are used at platinum, copper and gold mines. Apart from these, they are also used in various industries, such as lead, nickel, alumina, zinc and silver, to name a few.
Pebble mill
In pebble mills, a drum rotates fast and causes attrition and friction between ore particles and rock pebbles. They are used in order to avoid contamination of products by iron from balls of steel. Normally, silica and quartz is used due to its low biaya.
So, this was a an introduction to different tipes of grinding mills. You can buy one based on your grinding needs. Hope the article will make it easier for you to pick one.
Comparing Used Ball Mills Versus Used Rod Mills
Ball mills and rod mills are both excellent mining machines for grinding ores into fine powders and particles. However there are some advantages to using rod mills rather than ball mills for larger mining proyeks including greater efficiency, better grinding performnce and lower energy costs. Though ball mills are used more often rod mills can be the better pilihan for specific mining ores and larger site proyeks.
In a ball mill the actual balls in the machine need to cascade in order for the grinding to be accomplished. Because of this more energy is needed to power up a ball press as opposed to a rod press. Rod mills can be operated at lower peripheral speeds resulting in reduced energy costs. Though this difference in power can vary depending on the tipe of ore you are grinding the consensus is that a rod machine requires less speed to perform the same function as a ball piranti.
Another key faktor in choosing a rod machine over a ball tipe press is void ruang. You ideally want as little open ruang as possible so you have more grinding kontak between the rods and the ore. Ball mills need more open ruang so the balls inside can cascade and grind but this ruang lessens the kontak between metal and ore per surface tempat. Again, depending on the site proyek media rods won’t necessarily always be the better pilihan but if you are concerned about void ruang in your grinding process a rod machine may be the right choice.
If you are working on a mining site dig that is excavating large pieces of rock, coal, copper or other mining media than a rod mill may be a better bugar than a ball. Steel rods are more suited to breaking up larger pieces of ore due to the heavier weight of the rods. As well, heavier ore produces more energy per collision which can be better optimized by steel rods rather than balls. If you need to grind mining media down to fine particles than a ball mill is recommended but if the material is large consider a rod mill for the heavy duty grinding.
Those are a few things about grinding mills, for the selection of grinding mills according to their respective needs and uses. Of course all have advantages and disadvantages in each application.