The concentrator common crushing process
Concentrator of the more common two broken processes and broken processes.
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Two broken process is divided into two open and two closed-circuit. The latter’s second crushing machine and check the screening into a closed circuit, we can guarantee the product size to meet the requirements will not affect the next grinding operation. Sec process is only suitable for small-scale mining of underground mining methods, the total crushing than not, generally about 15 to 25, the broken ore is not more, often less than 1000 tons / day.
When the ore is less than 300mm, the first pre-screening (if the mesh is 75mm), get 75 ~ 0mm screening under the product does not have to been broken for the first time, only 300 ~ 75mm sieve product into the crusher, and then the first pre-screening screening products and for the first time broken product, and together, the second pre-screening (mesh 15mm), get 15 ~ 0mm under the screen, this is the crushing of the final grain degree, that is qualified granularity. Product particle size on the screen for 75 ~ 15mm, and second times broken, broken products but also by the screening of check (usually pre-screening and check screening combined in the same operation, called pre-screening). Greater than 15 mm substandard products continue to be broken, until the particle size to meet the requirements.
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Two open process is rarely used, only plants in certain re-election to two open process, to get the broken product to send the rod mill or jig, most of the concentrator using the two sections of a closed circuit.
The three-stage crushing process there are three sections open with three sections of a closed-circuit points. Have a pre-screening before a three-segment broken, but without pre-selection screening in the first paragraph or second paragraph. The three sections of open mainly because we can not guarantee the size requirements of the final product, seldom used.
The three sections of a closed circuit, use the check in the third paragraph of the sieve into a closed circuit, which is the most common processes. In large, medium and small concentrator, its total crushing ratio is larger, up to about 25 to 200, the maximum feed size of up to about 1000mm, crushing, product size can reach 12 mm mm or finer more.
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In individual cases, when the size of the concentrator, the ore block is also great, in order to reduce the crushing ratio, or for finer granularity of product can also be used, Sec crushing process.
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