The equation relates the amount of new product-sized material produced by the ball mill circuit to four key factors: mill power draw, classification system eficiency (CSE), ore grindability and mill grinding eficiency. MAusIMM, Senior Metallurgist, Metcom Technologies Inc, Suite B, 1021 West Baraga Avenue, Marquette Mi 49855, USA.

BALL MILL CIRCUIT SIZING METHODS. The basis for ball mill circuit sizing is still Bond's methodology (Bond, 1962). The Bond ball and rod mill tests are used to determine specific energy consumption (kWh/t) to grind from a given feed 80% passing size (F80) to 80% passing size product (P80).

 — Ball Mill Power Calculation Example #1. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns). The required product size distribution is to be 80% passing 100 mesh (149 microns).

Wet ball mill is a new type of ball mill designed according to a new concept, using special rolling bearings as the support structure of the cylinder. It systematically solves the life and centering problems of heavy-duty rolling bearings used to replace sliding bearings, sealing problems under harsh environmental conditions, and the problem of ...

Next, a guide for improving CSE through manipulation of design and operating variables in the classification system will be provided. Examples and case studies will illustrate the gains in ball mill circuit efficiency that can be achieved by maximising CSE.

 — Based on his work, this formula can be derived for ball diameter sizing and selection: Dm <= 6 (log dk) * d^0.5 where Dm = the diameter of the single-sized balls in mm.d = the diameter of the largest chunks of ore in the mill feed in mm.

Define and calculate the grinding efficiency of the ball mill in a ball mill circuit. Relate overall ball mill circuit output and circuit efficiency to specific design and operating variables. Compare sets of circuit survey data in terms of the elements of …

 — Circulating Load Calculation Formula. Here is a formula that allows you to calculate the circulating load ratio around a ball mill and hydrocylone as part of a grinding circuit. For example your ball mill is in closed circuit with a set of cyclones. The grinding mill receives crushed ore feed.

based on distributed collision energy information to predict size reduction in tumbling mills, in particular ball mills, analyzing critically various approaches proposed, their limitations and achievements, identifying areas that

The "functional performance equa-tion for ball milling" was first pre-sented in 1988. It has now been used successfully in a substantial number of mineral-processing plants. This powerful, yet simple, tool provides a new level of understanding of closed circuit grinding.