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When working with raw materials, mineral processing aims always to get the highest possible return on investment you need a grinding mill. One goal of crushing is to get a product suitable for immediate use in industry; another is to extract a metal from a complex ore.
Processing Framework for Grinding Mill
Drilling
This is the point when grinding all starts. Drilling, a rock cutting, is necessary before the following stages in the mineral processing procedure can begin. No matter how deep the minerals are, we are mining our way to the next level.
Crushing & Screening
Now the size reduction of our ore starts! This step accounts for most of the material handling in the processing cycle. Several kinds of crushing are used according to the defined specifications of size, form, and strength. Jaw Crushing, Roll Crushing, Gyratory Crushing, and Cone Smashers are a few of the smashers used in this procedure.
But hold on! This is not an article on Crushers & Screening, so why are we discussing crushing? Here we’ll offer you a sneak glimpse into the crushing and grinding stages of the size reduction process, which are employed to get the most bang for your buck. And thus, without further ado, let us get to the third and last step that has led you here: Grinding!
Grinding
For this reason, we plan on subjecting our ore to a second, more controlled step of crushing to produce a mineral powder. There might be different reasons for lowering the size — we could wish to release the minerals contained in ores or expose the mineral to a leach solution. Dry or wet grinding is equally possible. Dry treatment either does not need water for treatment, or no water is allowed in the ore treatment. It is more common to employ a wet grinding method since it requires less energy and produces more output from the mill. Dry grinding must be utilized if a wet grinder is feared to affect the chemical or physical constitution or/and if a more significant percentage of particles is desired.
How does the grinder work? What are the factors in play? Imagine a cylindrical steel tank with ore and a grinder medium moving within the mill, the revolving drum lifting these materials and ultimately breaking the ore into a predetermined product.
Further, the grinder mills may be grouped into three primary categories: rod, ball, and SAG. Which one do you think best fits your needs? Feed size and desired final product size are two key factors.
Sag Mills (Semi-Autogenously Grinding Mills)
Balls are used in these mills to crush the ore down to a finer consistency by attrition, pressure, and abrasive as the balls and grains of ore tumble and tumble. The product is 75 microns, with a feed size range of 400 mm / 16 in. The outcome of the massive SAG grinding is either a completed size ready for treatment or an immediate size for additional grinding. Platinum, gold, and copper miners utilize this technique, as do silver, zinc, lead, aluminium, and nickel businesses.
Rod Mills
Rod mills are revolving mills where steel rods are used as a grinding medium to crush and grind down ore particles. Rod mills can receive feed up to roughly 50 mm and generates a volume of 600 microns. Rod mills are better ideal for breaking up huge bits of ore because of the rods’ enormous weight. Vast chunks of coal, metal, stone or other materials are all examples of this. The result will be a fine aggregate for use in construction materials and chemical industries. This is very helpful for crushing rock-hard ores.
Ball Mills
Which employ steel grinding balls as media, grinding stuff by impact and attrition rather than pressure, producing a fine powder as a byproduct. Ball mills need a feed size of 15 millimetres (half an inch) or less, and their final products are outstanding, with no discernible fineness limit. Applications range from laser cutting & ceramic to paints, pyrotechnic, and even mineral processing. Ores of both non-ferrous & ferrous metals may be processed in these lines, as can a wide variety of powders, including cement, silicates, refractories, fertilizers, glass ceramics, etc.
The Lifespan of a Grinding Mill?
In reality, mills that have been properly maintained will provide you with reliable and trouble-free service year after year. As the grinding surfaces wear, the capacity and final product size will not change. Very little care is necessary, and idleness has a negligible impact, if any.
