Common Crushing Processes In Dressing Plants

Two-stage crushing process and three-stage crushing process

Two-side crushing process is divided into two-stage open-circuit and two-stage closed-circuit. The latters second crushing machine and the checking of 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 15-25, crushing the ore is not more, often less than 1000 tons / day.

For example, when less than 300 mm of ore, the first pre-screening (if the sieve of 75 mm), 75-0 mm sieve under the product do not have broken upon the first of 300-75 mm sieve product to enter crusher products screen under the first pre-screening and the first broken for the second pre-screening (mesh 15 mm), 15-0 mm sieve under, which is crushing the final particle size, that is qualified granularity. Sieve product particle size of 75-15 mm, and put it to the second broken product but also by the screening of check (usually pre-screening and check screening combined in the same job, call in advance to check screening). Greater than 15 mm substandard products remain broken until the particle size meets the requirements.

The two-stage open process is rarely used and only in certain re-election plant open with two processes, the products sent to the broken rod mill or road elimination, most of the concentrator using two closed circuit.

The three-stage crushing process can also be divided into three sections open and three sections with a closed-circuit. Have a pre-screening prior to the three-stage crushing, but without pre-screening in the first paragraph or second paragraph. The three sections open are seldom used mainly because we cannot guarantee the size requirements of the final product. The three sections of a closed circuit, using the check in the third paragraph of the sieve into a closed circuit, are the most common processes. Suitable for large, medium and small concentrator, its general crushing is large, up to 25-200 or so, the maximum feed size of up to about 1000 mm, the crushing product size can reach 12 mm or smaller more.

In individual cases, when the size of the concentrator, the ore block is also great, in order to reduce the crushing ratio, or in order to get finer granularity, we can also adopt four-stage crushing process.

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