The secondary ball mill, with the same dimensions, was operating with 34 % filling, fresh feed solids rate of 1,150 t/h, make-up ball size of 40 mm, a power draw of 13,294 kW and with an overflow discharge. ... overflow ball mill investigated was operating with 27 % mill filling, 70 mm of make-up ball size and power draw of 15,151 …

1.1 Working conditions. The material to be ground with feed size not more than 12.5mm, sieve rate not less than 80%, and discharge size not more than 0.075mm. The work index of the material is 13kW-h/t, and the universal hardness is f=8~12; the working condition of the overflow ball mill is continuously feeding. 1.2 Energy consumption index.

A database consisting of 121 sets of industrial overflow ball mill surveys worldwide was used to establish the pattern of the slurry residence time in the full scale operational overflow ball mills.

The effect on overflow ball mill power draw of the minor changes attributable to the increased feed rate may be different to that on an AG/SAG mill. ... Both primary (BM1) and secondary grinding ball mills (BM2 and BM3) have a similar residence time. For the PGM (platinum group minerals) plant ball mill (PL1 and PL2), on the other hand, …

A milling circuit consists of a primary SAG (semi-autogenous grinding) mill that is in open circuit. The product from the SAG mill is fed to the ball mill, with the product from the ball mills being classified in cyclones. The underflow from the cyclones is recycled, with the overflow forming the feed to the flotation circuit.The milling circuit.

Improvement of grinding effect in the secondary ball mill. Before industrial application, the −75 μm content in the fresh feed, discharge, overflow, and underflow were 41.79%, 56.83%, 88.23%, …

Secondary Grinding (3 replies) For secondary grinding (Ball Mill), what discharge Configuration is ideal with regards to cost saving for atypical copper milling plant with a throughput of say 331dmt/h. Qualify the selection of your recommendation. A simple overflow discharge, with or without trommel screen, is probably the cheapest to maintain.

Volume 108, July 2017, Pages 93-108. Combined DEM and SPH simulation of overflow ball mill discharge and trommel flow. M.D.Sinnotta, P.W.Clearya, R.D.Morrisonb. Show …

Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 – 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns.; The Center-Periphery Discharge mill has feed reporting from both …

The ball mill has a diameter of 7.32 m and length of 9.45 m (EGL) and has an overflow configuration. The secondary milling circuit is split into two parallel streams using a set of cyclones. The cyclone overflow, containing a less coarse silicate rich fraction, is sent to the IsaMill circuit to undergo mainstream inert grinding (MIG), and the ...

Overflow type ball mill is the key equipment for mineral materials secondary grinding after crushing. It adopts automatic self aligning double-row centripetal spherical roller …

We can design and manufacture grate type ball mill for mineral primary grinding and overflow type ball mill for mineral secondary grinding. The grinding media balls may be made of cast iron, steel, or ceramic, Correspondingly, the inner surface of the cylindrical shell is lined with an abrasion-resistant material such as manganese steel or ceramic.

As secondary ball mills are usually fed a relatively (compared to SAG mills) fine F80 and have high re-circulating loads and produce product fineness of the P80 - 100 to 160 micron range, fitting a grate discharge needs to be carefully considered. ... If a tubular ball mill for grinding is used, then the first option should be open circuit ...

Industrial overflow ball mill. The overflow ball mill utilized in the sampling survey has an inside diameter of 7.312 m and length of 9.6 m and is run in open circuit. It is used in secondary grinding of UG2 Platinum ore. The mill is equipped with 44 rubber lifter bars with height of 100 mm. Forged steel balls of diameter 40 mm are used as

The Overflow Discharge mill is best suited for fine grinding to 75 – 106 microns. The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 …

Here are some of the key features and advantages of overflow wet ball mills: Features: 1. Grinding Medium: Overflow wet ball mills use steel balls as the grinding medium. The size and type of ...

The secondary ball mill can increase the surface area by reducing the diameter of steel balls to enhance the abrasion. Industrial application results show that after the abrasion of the secondary ball mill for grinding magnetite was enhanced, the circulating load of the grinding-classification system dropped by 29.90% and the specific …

In AG/SAG-based circuits the need for W s appears to be unnecessary as Fig. 2 illustrates. Primary crusher feeds often have the shape shown in Fig. 2 and this has a very similar gradient to typical ball mill cyclone overflows. A similar situation appears to apply with HPGR product size distributions, as illustrated in Fig. 3.Interestingly the …

Lihir. Design, manufacture and commission a receival station to accept and tip 20" ISO sea containers. We are renowned for offering top-notch ball mills that are ideal for grinding applications in diverse industries. Our …

The secondary ball mill, with the same dimensions, was operating with 34 % filling, fresh feed solids rate of 1,150 t/h, make-up ball size of 40 mm, a power draw of …

Advanced Controller for Grinding Mills: Results from a · ore per day in six overflow ball mills The concentrate is transported to a smelter a few miles away The crushed ore from primary and secondary ores is conveyed into bins The ore from the bins is fed into the ball mill using a conveyor belt The ball mill grinding circuit is illustrated in Figure 2 % Solids …

Ball mills are often used as secondary grinding mills and for regrinding of middlings in concentrators. ... ball mills, overflow type 1/1470 pebble mills 1/1200. W for rod and ball mills shall be taken as the weight of the rod or ball charge, i.e. the weight of the pulp is to be ignored. For pebble mills therefore W is to be calculated on the ...

Ball mills are usually either of the grate (diaphragm) or overflow type. Ball Mill Components. Ball mills consist of the following components: Inlet – crushed ore is fed to the ball mill through the inlet. A …Ball mills are often used as secondary grinding mills and for regrinding of middlings in concen­ trators.

Ball mills designed for long life and minimum maintenance overflow ball mill sizes range from 5 ft. x 8 ft. with 75 HP to 30' x 41' . and as much as 30,000 HP. Larger ball mills are available with dual pinion or ring motor drives. Our mills incorporate many of the qualities which have made the Marcy name famous since 1913.

The secondary ball mill discharge will …secondary overflow ball mills – Grinding Mill China Different Types of Ball Mills Produced Ppt Working Principle of Overflow Type Ball Mill Ball mill is the key equipment for secondary grinding after » Learn More.Overflow ball mill is a kind of ball grinding mill which works in wet water …

Figure 2 shows a typical conventional crushing-grinding circuit with three stages of crushing followed by ball mills or rod mill-ball mill combination. This flowsheet is typical of many mills that have been built throughout the world. ... competent pebbles for the secondary grind. Autogenous plus Ball Mill has been used very infrequently. When ...

Secondary Overflow Ball Mills Introduction Overflow type ball mill is the key equipment for mineral materials secondary grinding after feeding material size ranges from 0mm to 35mm Application It is widely applied in the industries of cement silicate products new building materials refractory materials fertilizer etcsecondary overflow ball ...

1.1 Working conditions. The material to be ground with feed size not more than 12.5mm, sieve rate not less than 80%, and discharge size not more than 0.075mm. The work index of the material is 13kW-h/t, and the universal hardness is f=8~12; the working condition of the overflow ball mill is continuously feeding. 1.2 Energy …

Based on his work, this formula can be derived for ball diameter sizing and selection: Dm <= 6 (log dk) * d^0.5 where D m = the diameter of the single-sized balls in mm.d = the diameter of the largest chunks of ore in the mill feed in mm. dk = the P90 or fineness of the finished product in microns (um)with this the finished product is ...

2. Choose according to product fineness Generally speaking, the grid type ball mill is suitable for coarse grinding, and the overflow type ball mill is suitable for fine grinding. When it is necessary to grind to a uniform coarse-grained product of about 0.208~0.295mm (48~65 mesh), the grid type ball mill is better;

The overflow ball mill is mainly used for the wet grinding various ores. In the grinding process, while continuously feeding materials to the mill, a certain amount of water is also continuously fed, so that the finely ground materials and water form a mixed fluid. The ore pulp is discharged from the mill in a self-flowing manner to complete ...