brief comments on ball mill energy consumption in cameroon

Energy consumption Figure 5 shows the averages of net energy consumption per each mill in the regrind circuit on a monthly rate The data was obtained from the automatic control system of the circuits As can be seen the vertical mill consistently presented lower net specific energy consumption than the ball mills which operate on the same

The Bond work index W i as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding ore in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when for a given size of grinding product the value of the work index W i

The grinding process in ball mills is notoriously known to be highly inefficient only 1 to 2 of the inputted electrical energy serves for creating new surfaces

Jun 29 2016 · roller mill attrition and compression soft materials 3 colloid mill impact and attrition for all drugs and brittle materials 4 fluid energy mill impact and attririon for all drugs 5 ball mill impact and attrition moderately hard and friable materials general characteristics of various types of mills 26 mechanical attrition 27

The grinding energy consumption under each grinding condition can be calculated by Equation 4 and Equation 5 as shown in Table 3 W IB can be calculated by the Bond ball mill test P and F can be calculated by the undersized yield in grinding tests

In recent studies the plant tests were performed at Bougainville and batch tests were carried out at the Utah Comminution Center In all tests power measurements were made and several levels of energy input to grinding were evaluated Also tracer tests were performed for mill residence time determination The performance of Bougainville’s 55 x 64 m mill has been very successfully

Grinding energy was approximately 50 per cent of the ball mill and the drying capabilities allowed direct processing of materials of up to 20 per cent moisture content The main energy issue was the high power consumption of mill fans with pressure drops of 100mbar not uncommon with high nozzle ring velocities 70ms and internal mill

comparison of hpgr ball mill and hpgr stirred mill circuits to the existing agsag mill ball mill circuits by chengtie wang university of science and technology beijing 2009 a thesis submitted in partial fulfillment of the requirements for the degree of master of applied science in

Mill Speed No matter how large or small a mill ball mill ceramic lined mill pebble mill jar mill or laboratory jar rolling mill its rotational speed is important to proper and efficient mill operation Too low a speed and little energy is imparted on the product

Oleg D Neikov in Handbook of NonFerrous Metal Powders 2009 Tumbling Ball Mills Tumbling ball mills or ball mills are most widely used in both wet and dry systems in batch and continuous operations and on a small and large scale Grinding elements in ball mills travel at different velocities Therefore collision force direction and kinetic energy between two or more elements vary