Under grader opening level , the opening size of the next grading machine, grading machine opening level , the opening size grading machine during the installation on-site production, in many plant , because the equipment is installed in the classifier size of the opening height not adjusted well, and they do not pay attention to the workers during the operation , but also affects the mill invisible to normal operation. Under grader opening lower ore precipitation area is relatively large , so back to the large amount of sand , relatively fine grinding fineness , the next big opening grader , ore precipitation area is relatively large , relatively flat water , so the amount of sand back the large, relatively fine grinding fineness , the classifier opening lower , return sand is relatively large, the grinding fineness relatively thinner , the classifier opening , the relative return sand is relatively large, the grinding fineness relatively thinner. Otherwise contrary . In the grinding fineness guaranteed under the premise , you can increase the mill 's capacity to mine. The size of the amount of ore to the grinding fineness required to achieve the same , while ultrafine mill is to not clog . The whole process must be carried out in all aspects of the subtle operation.