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amount of feed to rod mill when grinding copper ore

amount of feed to rod mill when grinding copper ore

Copper Ore Crushing, Grinding Flotation

21/05/2017  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 rate of 2,106 STPD or 87.75 STRH.

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Copper Flotation - 911 Metallurgist

16/05/2016  GRINDING COPPER ORE As it is shown in this study the ¾” or 1″ crushed ore is fed to a rod mill operating in open circuit and discharging a product approximately minus 14-mesh.

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Rod Mills - 911 Metallurgist

31/05/2016  Rod Mill Capacity and Sizing Table Rod Mills may be considered either fine crushers or coarse grinding equipment. They are capable of taking as large as 2″ feed and making a product as fine as 35-48 mesh. Of particular advantage is their adaptability to handling wet sticky ores, which normally would cause difficulty in crushing operations.

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amount of feed to rod mill when grinding copper ore

GRINDING MILL. 25; A wide range of Ball Mill Rod lVlill ... Zinc Ore, Copper Ore, Uranium Ore etc. Grinding is the ... As a grinding media steel rods are used in Rod Mill and steel balls are ... a little amount of steel ball whereas Autogenous mill uses no separate ... and feed sleeve to prevent leakage of slurry in wet grinding. Read more

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Semi-Autogenous Grinding of Copper Ores - 911 Metallurgist

28/01/2019  The length and diameter of a SAG mill are determined principally by the desired throughput capacity and the grindability of the ore. For conventional ball mill grinding, grindability is usually expressed in terms of the Bond Work Index, which is determined in laboratory tests and expresses numerically the power required to reduce rock from a ...

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Rod Mill Feed Size - Grinding Classification Circuits ...

Bond would say ideal feed is 80% -16mm for a 13 W.I> material. If the Material has a higher W.I. there is a Bond formula to calculate the ideal feed size for a normal 1.5 to 1.8 L/D ratio rod mill. Dependent upon the Material and the Process! I seen feed as large as 100mm on soft material.

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Grinding and Classification Control - 911 Metallurgist

20/06/2019  The ore removed from the bins is weighed on the rod mill feed-belt, then discharged into a 9 ft. x 12 ft. rod mill operating in open circuit. The rod mill is driven by a 450 h.p. motor through a speed reducer and an air-operated clutch. The mill originally operated at 16 r.p.m., or 62%, of critical speed, which gave sufficient grinding capacity for the massive sulphide ore. The rod-mill ...

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Rod mills, how they function - Mine Engineer.Com

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. Rod mills accept feed

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Determination and scale-up of the milling parameters of a ...

The copper-cobalt ore used in the actual test work was obtained from the feed to the primary mill (run of mine) at the Etoile mine of Rwashi mining, a subsidiary of the Metorex group. The ball mill feed content mass was calculated using following . fd k c (11) The f c value was calculated from Eq.

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Simulating the Bond rod mill grindability test - ScienceDirect

01/01/2012  The classical method used to predict the specific energy consumption in grinding ores in rod mills was proposed by ... The simplified batch rod mill test proposed consists simply of conducting the test on the same standard mill, but then the feed material is ground for a total of 10 (exceptionally 5, for very soft ores), 20, 30, 70 and, for very tough ores, 100 and, if needed, more revolutions ...

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Grinding control strategy on the conventional milling ...

milling circuit consists of a rod mill followed by a ball mill in series. Crusher product (-9 mm) is fed to the rod mill, and the water is fed in ratio to the ore feed mass. The rod mill discharge is pumped, without any further water addition, to the first ball mill. The ball mill discharges to a sump where water is added before the slurry is pumped to the first cyclone (Cylcone 1). See Figure ...

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Ball Mills vs Rod Mills - 911 Metallurgist

03/07/2017  Because of this, the rod mill can effectively reduce 1″ feed size to 10 mesh or finer in open circuit. The voids (or interstitial space) within a rod load are approximately half those in a ball mill grinding load. Rods in place weigh approximately 400 pounds per cu. ft. and balls in place approximately 300 pounds per cu. ft.. Thus, quantitatively, less material can progress through the voids ...

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Rod Mills for coarse grinding FLSmidth

Rod Mills - your solution for grinding coarse materials. Available in multiple sizes. Designs extend to 15 feet x 22 feet (21 feet effective). Though mill length is limited by manufacturing constraints for the grinding rods, our Rod Mills are available in diameters from 5 feet up to 15 feet.

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TECHNICAL NOTES 8 GRINDING R. P. King

Figure 8.2 Media motion in the tumbling mill. 8.1 Grinding 8.1.1 Grinding action Industrial grinding machines used in the mineral processing industries are mostly of the tumbling mill type. These mills exist in a variety of types - rod, ball, pebble autogenous and semi-autogenous. The grinding action is induced by relative motion between the particles of media - the rods, balls or pebbles ...

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Small Grinding / Regrinding Mill 3 to 10 Kilo/Hr

The 911MPE-GM2024 is a mini but continuous grinding mill (8" diameter X 9 5/8" long) with an approximate capacity of 3 to 10 Kg/Hr (dependent on feed size and hardness). 75 mm diameter x 800 mm Long spiral classifier with tilt regulation from 16 to 22 degree 200 mm Diameter X 240 mm Long Grinding Mill which can be used as Ball Mill or Rod Mill Mill Motor Power of 1.03kW Feed Ore is

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Copper Cathodes - Cargo Handbook - the world's largest ...

The beginning for all copper is to mine sulfide and oxide ores through digging or blasting and then crushing it to walnut-sized pieces. 2. Grinding Crushed ore is ball or rod-milled in large, rotating, cylindrical machines until it becomes a powder usually containing less than 1 percent copper. Sulfide ores are moved to a concentrating stage ...

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Determination and scale-up of the milling parameters of a ...

The copper-cobalt ore used in the actual test work was obtained from the feed to the primary mill (run of mine) at the Etoile mine of Rwashi mining, a subsidiary of the Metorex group. The ball mill feed content mass was calculated using following . fd k c (11) The f c value was calculated from Eq.

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Analysis of process of grinding efficiency in ball and rod ...

The article presents the results of laboratory-scale research on the determination of the impact of ball mill parameters and the feed directed to grinding on its effectiveness and comparing it with the efficiency of grinding in a rod mill. The research was carried out for grinding copper ore processed in O/ZWR KGHM PM S.A. The aim of the research was to evaluate the efficiency of grinding in a ...

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TECHNICAL NOTES 8 GRINDING R. P. King

Figure 8.2 Media motion in the tumbling mill. 8.1 Grinding 8.1.1 Grinding action Industrial grinding machines used in the mineral processing industries are mostly of the tumbling mill type. These mills exist in a variety of types - rod, ball, pebble autogenous and semi-autogenous. The grinding action is induced by relative motion between the particles of media - the rods, balls or pebbles ...

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Palabora Mining Company Ltd

20/04/2021  Crushing plant product is then conveyed 1.4 kilometres to fill any one of six fine ore bins, each one feeding six rod mill flotation sections, all operating in parallel. Certain sections are used for wet grinding marginal ore to below 0.3mm, followed by a copper flotation process similar to that used for the underground ore. Concentrate is pumped to the dewatering plant, while magnetite is ...

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Crushing and Grinding Process - JXSC Machine

08/10/2019  The rod mill mainly grinds the ore by the pressure and the grinding force of the grinding rod. When the rod hits the ore, it first hits the coarser grade ore, and then pulverizes the smaller-sized material, between the rod and the rod. When the rod is in contact with the wall, the coarser-grained ore particles are mixed with it, which acts as a bar sieve. The finer-grained material can pass ...

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Grinding Mill - Hengin Heavy

Iron ore. 4500Kw. 320t/h. 191m3. 13.8r/min. 335t. ≤18. 90%. HENGIN can provide CITIC, SINOMA, NHI and other brand Grinding Mill,Ball mill, SAG mill ,AG mill,Rod mill

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COMMINUTION - THEORY AND PLANT PRACTICE

which is free to move inside the mill, thus comminuting the ore particles. The grinding medium may be steel rods, or balls, hard rock, or, in some cases, the ore itself. In the grinding process, particles between 5 and 250 nun are reduced in size to between 10 and 300 pin. All ores have an economic optimum mesh of grind which will depend on many

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Journal of Mining and Metallurgy, 52 A (1) (2016) 11 - 25 ...

10-50% compared to grinding by conventional ball and rod milling or semi-autogenous grinding with ball milling [3, 9, 10].The reported energy savings depend on the circuit arrangements, whether the grinding is being carried out wet or dry, the hardness of the ore, the amount of additional material handling operations and the methods used to define the energy savings. Other benefits include ...

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Application of Operating Work Indices in Autogenous ...

Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG 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 a large effect on profitability. Mill operators have long used operating work indices to evaluate grinding circuit efficiency, with great utility. Operating work ...

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Tomasz Gawenda's lab AGH University of Science and ...

The research was carried out for grinding copper ore processed in O/ZWR KGHM PM S.A. The aim of the research was to evaluate the efficiency of grinding in a drum mill dependably on the grinding ...

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Palabora Mining Company Ltd

20/04/2021  Crushing plant product is then conveyed 1.4 kilometres to fill any one of six fine ore bins, each one feeding six rod mill flotation sections, all operating in parallel. Certain sections are used for wet grinding marginal ore to below 0.3mm, followed by a copper flotation process similar to that used for the underground ore. Concentrate is pumped to the dewatering plant, while magnetite is ...

Get Price

Analysis of process of grinding efficiency in ball and rod ...

The article presents the results of laboratory-scale research on the determination of the impact of ball mill parameters and the feed directed to grinding on its effectiveness and comparing it with the efficiency of grinding in a rod mill. The research was carried out for grinding copper ore processed in O/ZWR KGHM PM S.A. The aim of the research was to evaluate the efficiency of grinding in a ...

Get Price

Copper Cathodes - Cargo Handbook - the world's largest ...

The beginning for all copper is to mine sulfide and oxide ores through digging or blasting and then crushing it to walnut-sized pieces. 2. Grinding Crushed ore is ball or rod-milled in large, rotating, cylindrical machines until it becomes a powder usually containing less than 1 percent copper. Sulfide ores are moved to a concentrating stage ...

Get Price

TECHNICAL NOTES 8 GRINDING R. P. King

Figure 8.2 Media motion in the tumbling mill. 8.1 Grinding 8.1.1 Grinding action Industrial grinding machines used in the mineral processing industries are mostly of the tumbling mill type. These mills exist in a variety of types - rod, ball, pebble autogenous and semi-autogenous. The grinding action is induced by relative motion between the particles of media - the rods, balls or pebbles ...

Get Price

Copper extraction - Wikipedia

Copper ores containing chalcopyrite can be concentrated to produce a concentrate with between 20% and 30% copper-in-concentrate (usually 27–29% copper); the remainder of the concentrate is iron and sulfur in the chalcopyrite, and unwanted impurities such as silicate gangue minerals or other sulfide minerals, typically minor amounts of pyrite, sphalerite or galena. Chalcocite concentrates ...

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The development of regrind-flotation pre-treatment of the ...

When the rod mill was used, 1 kg of slurry was collected from the processing plant and filtered to remove excess water. The filter cake was immediately repulped with process water to 67 wt.% solids for grinding in a 300 mm diameter stainless steel laboratory batch rod mill with inert grinding media, stainless steel rods. Grinding time

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COMMINUTION - THEORY AND PLANT PRACTICE

which is free to move inside the mill, thus comminuting the ore particles. The grinding medium may be steel rods, or balls, hard rock, or, in some cases, the ore itself. In the grinding process, particles between 5 and 250 nun are reduced in size to between 10 and 300 pin. All ores have an economic optimum mesh of grind which will depend on many

Get Price

Application of Operating Work Indices in Autogenous ...

Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG 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 a large effect on profitability. Mill operators have long used operating work indices to evaluate grinding circuit efficiency, with great utility. Operating work ...

Get Price

Current Energy Requirements in the Copper Producing ...

20/12/2013  An analysis of energy usage in the production of refined cathode copper was made from mining ore to cathode copper. In mining copper ore the greatest energy consumers are ore hauling and blasting. Another important factor is the “recovery efficiency” of the metallurgical processes used to extract the copper. The mining and mineral concentrating energies are directly proportional to the ...

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Chalcopyrite Flotation and Liberation Characteristics ...

The Copper Concentrator at Mount Isa Mines Limited treats on average 18 000 tonnes/day of chalcopyrite ore containing typically three per cent copper. The main gangue minerals are iron sulphides (-13 per cent) and non sulphide gangue (-78 per cent). In August, 1991, the comminution flowsheet was changed from a conventional circuit (crusher/rod mill/two stage ball milling) to a modem circuit ...

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