Hi Magee. Thank you for your question.

Open circuit system means that materials pass through grinding machine one time. But if unqualified materials should be reprocessed by classifying equipment and powder satisfied requirements can be final products, this case can be called closed circuit system. The advantages of open circuit system are simple process, easy operation and less infrastructure investment cost. Its disadvantage is that the materials are easy to be ground overly. Materials must all meet the demand or fine powder will prevent other materials grind because there will be a buffer layer. Sometimes fine powder will became sphere of powder which will reduce efficiency greatly. And the capacity will be reduced and electricity consumption si improved.

But closed circuit system is adverse to open circuit system. The advantage of closed circuit system is eliminating over grinding phenomenon and reducing temperature of grinding chamber. Then the grinding efficiency and capacity is improved. In general, the capacity can be improved by 10%-20% compared with cement mill when these specifications are similar. And capacity can be improved by 30% when grinding raw materials. But the disadvantages are complex process, many machines and large infrastructure investment costs.

Liming Heavy Industry (Shanghai)