amount of feed to rod mill when grinding copper ore

Thus, quantitatively, less material can progress through the voids in the rod mill grinding media than in the ball mill, and the path of the material is more confined. This grinding action restricts the volume of feed which passes through the mill, without causing an overload condition.

In the second stage grinding process, the rod mill is generally used as the first stage grinding equipment, which has large production capacity and high efficiency. In the treatment of soft or not too hard ore, rod mill can instead the short head cone crusher for fine crushing, which is not only simple in configuration, but also low in cost.

Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds. The feed to ball mills (dry basis) is typically 75 vol.-% ore and 25% steel. The ball mill is operated in closed circuit with a particle-size measurement device and size-control cyclones.

COPPER MOUNTAIN: OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION MILL DRIVES ABSTRACT This paper will first give a short overview of the Copper Mountain project in British Columbia, which just has started commercial operation earlier this year. The grinding …

For this study, materials (copper sulphide ore) were sampled from the SAG mill feed in Sungun copper concentrator plant. The density of ore was 2.8 g/cm 3.The ore was crushed in a laboratory scale jaw crusher and roll crusher successively to prepare materials for ball mill grinding tests.

barite ore rod mill luckyard.nl. barite grinding ball mill for gold ore copper grinding. barite grinding ball mill for gold ore copper grinding Equipment Sizing Crusher or Grinding MillThese may include packing in a crusher, oversize feed or improper ball and rod sizes in a tumbling mill…

· At Britannia the copper ore contained just over 1% copper (though in the early years it was . the ball mills were about the size and weight of a shot put ball. . One chemical (called a 'frothing agent') was added to create a frothy mass of . tailings high in silica values …

Bond Rod Mill Index Test. Measuring ore grindability in rod mills. The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions. It is a 'locked cycle' test conducted in closed ...

Grinding and Flotation. Fine ore at minus 19mm (¾”) sizing is fed at a controlled rate into the open-circuit 2600mm x 3960mm (8’-6 x 13’-0) Hardinge rod mill at an average feed …

Ore Grinding Mills are used for the fine grinding as the last step in the reduction of an ore prior to concentration (gravity or flotation) or cyanidation.Practice varies, depending upon the type of ore and the amount of reduction required. In addition, some of the older properties continue with methods that perhaps are not considered the best in light of recent improvements but that cannot be ...

Grinding mill process design. Choosing an appropriate grinding circuit configuration depends on your ore characteristics and mine plan. Outotec has extensive knowledge of comminution technologies and processes to ensure we provide the optimal solution for your needs.

Copper/Molybdenum Ore. The figure above is a simplified flow sheet showing the basic steps involved in a copper mill producing the byproduct molybdenum. The crushed copper ore (containing, for example, 0.75% Cu and 0.015% Mo) is fed to the grinding circuit where water is added and the ore is …

Overcharging results in poor grinding and losses due to abrasion of rods and liners. Undercharging also promotes more abrasion of the rods. The height (or depth) of charge is measured in the same manner as for ball mill. The size of feed particles to a rod mill is coarser than for a ball mill. The usual feed size ranges from 6 to 25 mm.

The design characteristics of industrial rod mills are similar to ball mills. Most rod mills used in mineral processing are of the overflow discharge type as illustrated in Figure 7.2a. Centre peripheral (Figure 7.2c) and end peripheral discharge mills (Figure 8.1) are also in use.The feed end is generally fitted with spout feeders, scoop feeders, double scoop feeders or drum feeders.

The Steel Head Rod Mill (sometimes call a bar mill) gives the ore dressing engineer a very wide choice in grinding design.He can easily secure a standard Steel Head Rod Mill suited to his particular problem. The successful operation of any grinding unit is largely …

Cement Mill, Ball Mill, Grinding Ball Mill manufacturer / supplier in China, offering Ball Mill for Gold Ore, Rock, Copper, Cement Grinding, High Quality Casting Steel Lining Plate / Liners for Grinding Mills, High Quality Pinion Gear for Rotary Kiln & Gear for Cement Ball Mill and so on.

For the mining industry, our semi-autogenous (SAG) grinding mill uses a minimal ball charge in the range of 6-15 percent. It is primarily used in the gold, copper and platinum industries as well as in the lead, zinc, silver, and nickel industries. Autogenous (AG) grinding mills involve no grinding media as the ore itself acts as the grinding media.

Rod mills are very similar to ball mills, except they use long rods for grinding media. The rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6.

Jun 19, 2015· If 75 percent of critical speed is considered desirable for efficient grinding in a 2.4 meter (8 foot) diameter mill, then the same will be true for a 5.0 meter (15½ foot) diameter mill.

Wet rod mill is mainly used for coarse grinding. It is configured for fine and coarse grinding in the first stage open-circuit grinding ... Applicable materials:quartz, iron ore, copper ore, gold ore, glass, construction waste, cement clinker, etc. ... The continuous feeding of ores can create considerable pressure to make ores move from feed ...

Xinhai grinding mill has excellent energy saving ability, Xinhai, as ball mill manudactures, the energy-saving ball mill up to 30%, great ball mill working principle, which greatly reduces the cost of the ore …

F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles. [citation needed] But note that the term 'rod mill' is also used as a synonym for a slitting mill, which makes rods of iron or other metal. Rod mills are less common than ball mills for grinding minerals.

fed in ratio to the ore feed mass. The rod mill discharge is pumped, without any further ... the amount of slurry reporting as fresh feed to the second milling circuit will increase. With the increase in feed material to the second milling ... Grinding control strategy on the conventional milling circuit With the increase in ratio set point, a ...

Rod Mill, Rod Ball Mill, Rod Mill Process, Rod Mill … 6 · Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (4 to 35 mesh). Rod mill is widely applied in metal and nonmetal mine, water conservancy, glass and construction materials industries, mainly suitable for grinding various ores ...

A rod mill uses steel rods as the grinding media in tumbling mills is an efficient means to feed ball mills a product finer than could be made in a crusher but coarser than could be made in a ball mill. The principal use for rod mills, which were invented to make ball mill feed in a wet-grinding rod mill-ball mill circuit. Rod mills came into ...

crushed ore (-13 mm) from the fine ore stockpile onto the rod mills feed conveyor. The grinding circuit consists of two rod and ball mills followed by pebble mills. The existing mill capacity is 20,000 t/d with a reported availability of 92%. Mount Polley concentrates are trucked to facilities at the Port of Vancouver,

Grind coarse feed material with a reliable Rod Mill that won't over-grind. If you are in need of an application for coarse materials like limestone, potash, coal, phosphate and bauxite, you may be looking for a solutions like Rod Mills. Rod Mills are particularly useful, if you run a low tonnage operation and are looking for coarse product.

Jun 20, 2015· If 75 percent of critical speed is considered desirable for efficient grinding in a 2.4 meter (8 foot) diameter mill, then the same will be true for a 5.0 meter (15½ foot) diameter mill.