The main equipment used in the extraction of silver includes jaw crusher, ball mill, spiral classifier, flotation machine, thickener, dewatering machine and other equipment. Here is the whole flotation process flow used in the extraction of silver 1. Crushing stage Under the action of vibrating feeder, the mined silver ore is sent to the jaw.Get A Quote
Coal is categoried into four rankings based on carbon content anthracite coal hard coal, which has the highest carbon content bituminous soft coal sub-bituminous and lignite brown coal, which has the lowest carbon content.
Each type of coal has differing degrees of friability, meaning how hard it is, how brittle it is and how it breaks up. This is measured by the Hardgrove Grindability Index HGI.
After coal is extracted from the earth, it can be delivered as raw coal to wash plants or reduced to the proper particle sie at the mine and transported for its intended use.
The two main uses of coal are for power generation and steel production. In order to yield the highest thermal and financial benefits when shipping direct, the coal is often crushed to 2 x 0 to maximie the haulage capacity of trucks and trains. It is then transported to power plants and steel plants with minimal loss of volume.
Ideally, the seller and buyer want the coal to contain as little waste, or fines -30 mesh, as possible to optimie the value of the product.
During the crushing phase, there several are steps that can be taken to minimie fines generation and increase the product yield.
Whenever coal is handled, whether by man or machine, it tends to degrade. The minute particles that form coal dust are the results of coal degradation. Therefore, it stands to reason that the more gently coal is handled, the less it will degrade.
Even though you are intentionally degrading the material as part of a necessary process when crushing coal, you can expect fewer fines to be generated with slower action or rotational speeds of the crushing device.
Many crushers have the built-in ability to run faster than their optimal speeds to produce at higher rates. If the throughput capacity is more important to you than controlling fines, then higher speeds may be the choice.
When reduction ratios of the coal can be decreased to 41, 31 or 21 in Roll Crushers, for instance, the feed material can more easily pass through the crushing one with unimpeded, continuous flow. This means the material is only briefly in contact with the crushing elements and does not encounter the crushing teeth for more than a single rotation.
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