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(1) Rod mill is usually selected in order to prevent over grinding in gravity or magnetic separation plant of tungsten tin and other rare metals mine (2) In two stages grinding the capacity of rod mill machine used in the first stage grinding is larger than ball mill's (3) In some cases rod mill can replace short head cone

Grinding Mills Ball Mill Rod Mill Design Parts Generally rod mills are used for Coarse grinding from nominal % in feed to a nominal 10 mesh product Preparing ball mill feed for two or more stages of grinding Producing a material with a minimum of fines and a

9 2 Design of AG/SAG Mills Since the breakage of ore in AG/SAG mills is mostly due to impact on particles and media from a height these mills generally have a large diameter-to-length (D/L) ratio However this ratio varies and mills with large length-to-diameter ratio are also in

Tailings are the materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore Tailings are distinct from overburden which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed The extraction of minerals from ore can be done two ways: placer mining which uses water

(1) Rod mill is usually selected in order to prevent over grinding in gravity or magnetic separation plant of tungsten tin and other rare metals mine (2) In two stages grinding the capacity of rod mill machine used in the first stage grinding is larger than ball mill's (3) In some cases rod mill can replace short head cone

mill As such primary ball mills should be designed with the rod mill work index and single-stage ball mills should be with both the rod mill and ball mill indices This is because it is common to observe a difference (sometimes significant) between the rod mill and ball mill index values for a given ore type (McKen Verret Williams 2006) On

Tailings are the materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore Tailings are distinct from overburden which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed The extraction of minerals from ore can be done two ways: placer mining which uses water

Design Data Required For Selecting Cone Mining Mill Grinding Mills: Ball Mill Rod Mill Design Parts Common types of grinding mills include Ball Mills and Rod Mills This includes all rotating mills with heavy grinding media loads This article focuses on ball and rod mills excluding SAG and AG mills

Fewer mills are however easier to control and capital and installation costs are lower so the number of mills must be decided at the design stage The high unit capacity SAG mill/ball mill circuit is dominant today and has contributed toward substantial savings in capital and operating costs which has in turn made many low-grade high-tonnage operations such as copper and gold ores feasible

A mill is a device that breaks solid materials into smaller pieces by grinding crushing or cutting Such comminution is an important unit operation in many processes There are many different types of mills and many types of materials processed in them Historically mills were powered by hand (e g via a hand crank) working animal (e g horse mill) wind or water ()

Rod mill is a type of grinding mill whose grinding media is steel bar while ball mill is steel ball 1 Rod mill are usually applied to grinding the w-sn ore and rare metal in the reselection or magneticore-dressing plant in order to avoid the damage caused by the over crushing 2 In the two stage grinding process if it requires grinding the ore from 20-6mm to 1-3mm in the first stage rod

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mills with the rod mill and ball mill laboratory work indices Note in Figure 1 that the rod mill product slope is less than 0 5 due to an extra amount of nes present being ﬁ ﬁ ner than 650 μm These ﬁ nes proceed to the ball mill improving the ball mill efﬁ ciency Also the plotted rod mill P80 value as shown in Figure 1 is 2900

9 2 Design of AG/SAG Mills Since the breakage of ore in AG/SAG mills is mostly due to impact on particles and media from a height these mills generally have a large diameter-to-length (D/L) ratio However this ratio varies and mills with large length-to-diameter ratio are also in

Design Data Required For Selecting Cone Mining Mill Grinding Mills: Ball Mill Rod Mill Design Parts Common types of grinding mills include Ball Mills and Rod Mills This includes all rotating mills with heavy grinding media loads This article focuses on ball and rod mills excluding SAG and AG mills

mills with the rod mill and ball mill laboratory work indices Note in Figure 1 that the rod mill product slope is less than 0 5 due to an extra amount of nes present being ﬁ ﬁ ner than 650 μm These ﬁ nes proceed to the ball mill improving the ball mill efﬁ ciency Also the plotted rod mill P80 value as shown in Figure 1 is 2900

Fewer mills are however easier to control and capital and installation costs are lower so the number of mills must be decided at the design stage The high unit capacity SAG mill/ball mill circuit is dominant today and has contributed toward substantial savings in capital and operating costs which has in turn made many low-grade high-tonnage operations such as copper and gold ores feasible

Figure 7 2 B indicates a mill where a diaphragm or grate is placed before the exit end so that particles greater than the openings of the diaphragm are not discharged but held back for further grinding Grate discharge mills give less excessive grinding compared to overflow mills and are best suited to grinds to 150–250 μm In Figure 7 2 C the discharge opening is at the centre of the mill

Bond Rod Mill Grindability Test The test determines the Bond Rod Mill Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing ball mills* Various correction factors may have to be applied The test is a closed-circuit dry grindability test performed in a standard rod mill

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