In Grinding, selecting calculate the correct or optimum ball size that allows for the best and optimumideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize just in case. Well, this safety factor can cost you much in recovery andor mill liner wear andGet Price
ness of the models. For a given mill to have a combination of feed size, ball load, mill speed and solids will represent the total load. Ball Mill SAG Mill Scw Jb Pc 634 134 NNc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig. 1. SABC AB milling circuit.
Obviously, the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method, but the overall total is 99.5 of the predicted total. Examples The Hemlo gold project of TeckCorona 1000 mtpd provides an example of mill sizing using the empirical calculation method alone.
The ratio of SAG hardness to grind from F80 152 mm to T80 1.7 mm divided by the Bond ball mill work index was defined as a key factor in the design of a new SAGball mill circuit. Simulation techniques that do not consider this ratio may produce erroneous results. A clear picture is emerging as the SAG mill comminution literature expands with
RE Manual design of SAGballrod mill foundations youngstructural Structural 7 Mar 07 1827 I have a bit of a long answer here, so I39ll give you a synopsis I don39t think an design can be produced manually, and I think a preliminary design could be detrimental ie increase client expectations.
breakage tests do not include ball mill grinding data. Based on the 2009 CIM paper Starkey and Samuels, 2009, the ratio of SAG to ball mill grindability is an important factor in achieving a reliable SAG mill circuit design because that ratio reveals the best and most practical split for SAG and ball mill energy for the ore being tested.
2.1 SAG mill modeling In MODSIM, one of the simulation models used for a SAG mill unit is SAGT SemiAutogenous Grinding with Trommel model. In this model, a SAG mill with a trommel screen at mill discharge is modeled using the full population balance including particle attrition and wear King 2001b. In this
SAGAG milling option is ideal for starter projects with significant exploration and expansion potential. Currently a number of the largest SAG mills designed are installed in single stage configuration. This paper discusses the challenges associated with the process design of single stage SAGAG milling circuits, the design flexibility required to
This project is to design and fabricate the mini ball mill that can grind the solid state of various type of materials into nanopowder. The cylindrical jar is used as a mill that would rotate the
LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp5762. Gross power No load power Net power drawn by the charge 8.13 The net power is calculated from Net power KD2.5L e c. Watts 8.14 In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the
In Grinding, selecting calculate the correct or optimum ball size that allows for the best and optimumideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize just in case. Well, this safety factor can cost you much in recovery andor mill liner wear and
The ball impact energy on grain is proportional to the ball diameter to the third power 3 E K 1 d b. 3 The coefficient of proportionality K 1 directly depends on the mill diameter, ball mill loading, milling rate and the type of grinding wetdry. None of the characteristics of the material being ground have any influence on K 1.
By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ballmill circuit feed is maintained while still unloading the SAG circuit Mosher et al, 2006. A variant of this method is to direct pebblecrushing circuit product to the ballmill sump for secondary milling while convenient, this has the
2006. The laboratory benchscale SAG mill reproduces operating conditions of a commercial SAG mill, in a closed circuit dry grinding environment. The ground product for the laboratory SAG mill is then submitted to the Bond ball mill work index test. The number of SAG mill revolutions required to grind the material to a P
The basic parameters used in ball mill design power calculations, rod mill or any tumbling mill sizing are material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating solids or pulp density, feed size as F80 and maximum chunk size, product size as P80 and maximum and finally the type of circuit openclosed
AGSAG Wio, AWio kWht 28.5 Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWht 13.4 Bond Rod Mill Work Index, RWi, kWht 18.1 Table 1. Example of AGSAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have
Please find below two calculators for sizing mills using the Bond and Rowland methods Ball mill sizing Calculator for ball mills in a single stage circuit. Rod ball mill sizing Calculator for rod mills as first stage of the circuit and ball mills as second stage of the circuit.
Ball Mill Power Calculation Example 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 inch 6350 microns.
Effect of Mill Speed on the Energy Input In this experiment the overall motion of the assembly of 62 balls of two different sizes was studied. The mill was rotated at 50, 62, 75 and 90 of the critical speed. Six lifter bars of rectangular crosssection were used at equal spacing. The overall motion of the balls at the end of five revolutions is shown in Figure 4. As can be seen from the