Two-stage grinding load and product particle size control

The two-stage grinding process of the rod mill-gravel mill-hydrocyclone is shown in Figure 1. The first section is an open rod mill, and the second section is a gravel mill and a hydrocyclone closed circuit. The ore supply, ore size and hardness of the rod mill and the ore concentration of the rod mill have a great influence on the ore size of the mill. The final product particle size is primarily controlled by the slurry concentration and flow rate of the cyclone feed. The load of the gravel mill has a unimodal characteristic relationship with the transmission power of the gravel mill.

Figure 1 Two-stage grinding flow chart

The main measurement parameters of the grinding circuit: P1—gravel mill power, F2—rod mill feeding amount, F3—rod mill water supply, F4—sand pump pool water supply, L5—sand pump pool level, D6— Applicator feed concentration, F7 - cyclone 澉 water supply, L5 - sand pump 澉 liquid level, D6 - flow device feed concentration, F7 - cyclone feed ore slurry volume flow, Z8 - cyclone overflow Flow product granularity. The controllable parameters are the amount of rod grinding and the amount of water, the amount of gravel added and the amount of water supplied by the sand pump pool.

The main control objective of the two-stage grinding system is to separate the useful minerals in the ore from the maximum amount of ore and the size of the stabilized product without excessive pulverization. In order to achieve this control goal, the system controls the load of the gravel mill, the ore control of the rod mill, the control of the water supply, the control of the sand pump, the slurry level, the concentration of the cyclone feed and the size of the overflow product. Control, as well as automatic adjustment of the grinding load and product size control of the ore dosing value.