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The grinding process is a size reduction operation used in the mineral industry to liberate the valuable minerals from the discardable gangue Fig 1 shows the flowsheet of the plant it is a standard two stage grinding circuit which consists of a rod mill in open circuit and a ball mill in closed circuit with a hydrocyclone classifier

Chat Online### Ball Mills vs Rod Mills

Jul 03 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..

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The Journal of The South African Institute of Mining and Metallurgy JULY 2001 165 Introduction There are six parallel conventional milling circuits at Palabora Mining Company Each 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

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Jul 02 2009 The rod mill performs best when making products having a top size of 4 mesh to 16 mesh operating in open circuit or as fine as 35 mesh operating in closed circuit with a screen or other sizing device The rod mill accepts feed ore as coarse as 1 1/2 top size although better performance is obtained by restricting ore feed size to 3/4 .

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Jun 10 2020 Closed Circuit Grinding VS Open Circuit Grinding Metallurgical ContentOpen Circuit GrindingClosed Circuit GrindingGrinding Circuit Process Control VariablesGrinding Operating Costs The simplest grinding circuit consists of a ball or rod mill in closed circuit with a classifier the flow sheet is shown in Fig 25 and the actual layout in Fig 9.

Chat Online### Rod Mill Feed SizeGrinding Classification Circuits

It depends on the rod mill work index and on the desired product size It will also depend on if you are grinding open or closed circuit and wet or dry And if you have any stages of grinding crushing or classification before it It will generally be between 10 mm and 50 mm Sandeep Bisht.

Chat Online### Tubular Rod MillsScienceDirect

Jan 01 2016 Circuit 3 Rod Mill Open Circuit Ball Mill Closed Circuit with Double Classification Circuit Figure 8.2 shows a flow sheet where the rod mill is in open circuit and the ball mill is in closed circuit with a classifier This is a normal set up as the primary function of a rod mill is to provide a uniform sized feed to the ball mill.

Chat Online### SAG millsMetso Outotec

Open jobs Students and graduates This in turn contributes to lower capital and maintenance costs for a SAG mill circuit Versatile applications They can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work done by a ball mill.

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Minus 1/2 material is fed to a grinding circuit that consists of two parallel grinding lines Circuit A consists of a 10.5 diameter x 14 700 HP rod mill and 13.5 x 20 2200 HP ball mill while Circuit B consists of a 15 diameter x 20 2200 HP rod mill and a 16 x 28.5 4500 HP ball mill.

Chat Online### A Method of C alculating Autogenous Semi Autogenous

that if a rod mill is operating alone an inefﬁ ciency factor of 1.2 should be added provided the mill feed is screen undersize If the rod mill feed is produced from an open circuit crusher the factor to be applied increases to 1.4 SINGLE STAGE BALL MILLS Single stage balls add to the argument that rotary mills

Chat Online### Open Circuit And Closed CircuitSupertech International

Open circuit grinding consists of one or more grinding mills either parallel or in series that discharges a final ground product without classification equipment and no return of coarse discharge back to the mill Some very simplistic examples of open circuit grinding are see below and are made of a Rod mill Ball Mill or a Rod mill ball

Chat Online### AMIT 135 Lesson 6 Grinding CircuitMining Mill Operator

AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work of a ball mill Because of the range of mill sizes available AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit A diagram of types of AG/SAG

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Aug 29 2013 The relatively coarse open circuit rod mill product plus the ability to not generate excess fines is key to making a high percent solids low viscosity slurry capable of being pumped directly

Chat Online### Rod Mill Design Calculations

Apr 05 2018 Rod Mill Design Calculations EF1Dry Grindingfor the same range of work dry grinding requires 1.3 times as much power as wet grinding EF2Open Circuit Grindingwhen grinding in open circuit ball mills the amount of extra power required compared to closed circuit ball milling is a function of the degree of control required

Chat Online### Rod MillsMineral Processing Metallurgy

May 31 2016 ROD MILL CAPACITIES The above tables list some of the most common Open End Rod Mill sizes Capacities are based on medium hard ore with mill operating in closed circuit under wet grinding conditions at speeds indicated For dry grinding speeds and power are reduced and capacities drop 30 to 50 ROD MILL

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May 06 2016 The rod mill discharge flows to a second classifier for desliming in the same manner as in the classifier after the scrubber In case a finer grind is desired the rake product may be in closed circuit with the mill Open circuit is usually satisfactory since it does remove a big bulk of the load from the subsequent classification and

Chat Online### is a rod mill an open circuit

The rod mills accept a feed size up to 2 and produce a typical product size of 5 to 10 mesh when operating in open circuit and as fine as 35 mesh in closed circuit with a screen or other sizing device.

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Mar 20 2017 Rod mills are generally operated in an open circuit because of their grinding action especially when preparing feed for ball mills Ball mills however are virtually always operated in a closed circuit with some form of classifier.

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Shanghai XSM is a rod mill an open circuit is professional manufacturer the main production stone crusher machine Learn More The rod mill performs best when making products having a top size of 4 mesh to 16 mesh operating in open circuit The main feature of the rod grinder lies in Learn More .

Chat Online### How to Choose a Ball Mill or a Rod Mill by direolindaqwe

Aug 29 2019 generally larger than that of a ball mill of the same specification 3 Analysis of grinding media Rod mills commonly use steel rods with a diameter of

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Dec 02 2012 Rod mill Rod mills for sale from rod mill manufacturers The rod mill works best when making products having a top size of 4 mesh to 16 mesh operating in open circuit Features Benefits Rod Mill for sale is a More detailed

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Autogenous Mills Grinding Circuits Open Circuit Grinding to fall between Kick and Rittinger Bond s range of conventional rod mill and ball mill grinding Get Price Different configurations of SAG ball and rod mill occur but in general a SAG mill can be assisted grinding is known as a Semi Autogenous Grinding or SAG

Chat Online### How To Calculate Charge Volume In Ball Or Rod Mill

How To Calculate Charge Volume In Ball Or Rod Mill open circuit grindingwhen grinding in open circuit ball mills the amount of extra power required compared to closed circuit ball milling is a function of the degree of control required on the product produced the inefficiency factors for open circuit

Chat Online### IsaMillWikipedia

In contrast ball mills rod mills and other tumbling mills are only partially filled by the grinding medium and the ore Figure 2 Schematic view of an IsaMill showing the principles of its operation open circuit operationthe internal product separator

Chat Online### Closed Circuit And Open Circuit Mill Crusher Mills Cone

As standard the 16 x 48 sectionalized mill may be operated a as a rod ball or pebble mill b in open or closed circuit with cyclone or spiral classifier.

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NORTH AMERICA In North America FCX operates seven open pit copper mines Morenci Bagdad Safford Sierrita and Miami in Arizona and Chino and Tyrone in New Mexico and two molybdenum mines Henderson and Climax in Colorado Molybdenum concentrate gold and silver are also produced by certain of FCX s North America copper mines.

Chat Online### The production of ferroniobium at the Niobec mine

The rod mill is a 10.5 X 14 Allis Chalmer operated in open circuit driver by a 700 Hp motor The discharge is pumped to a distributor box feeding 12 multifeed vibrating screens installed with 0.23 mm urethane panel The oversize from the Hardinge grate discharge ball mill operated in closed circuit with the screens.

Chat Online### Is A Rod Mill An Open Circuit

Is A Rod Mill An Open Circuit Rod Mill Design Calculations EF1 Dry Grinding for the same range of work dry grinding requires 1 3 times as much power as wet grinding EF2 Open Circuit Grinding when grinding in open circuit ball mills the amount of extra power required compared to closed circuit ball milling is a function of the degree of control required on the product produced The inefficiency

Chat Online### What Is A Rod Mill What Are The Main Applications Of A Rod

Rod Mill Rod mills are used in an open circuit between crushing and the ball mill they often operate in wet and where the pulp contains up to 50 solid by mass this machine is equally very applicable to dry where it could take a feed that has achieved 6 moisture as such when the product is sticky rod mills are preferred over ball.

Chat Online### Industrial Situationan overview ScienceDirect Topics

For rod mill operation only Feed prepared by open circuit crushing Use a factor of 1.4 Feed prepared by closed circuit crushing Use a factor of 1.2 Factors F 3 F 4 and F 6 have also to be applied Use F 3 F 4 and F 6 b For rod mills in a rod mill–ball mill operation Rod mill feed from open circuit crushing Use a factor of 1.2

Chat Online### Rod Millan overview ScienceDirect Topics

Rod mills are used in an open circuit between crushing and the ball mill They often operate in wet and where the pulp contains up to 50 solid by mass This machine is equally very applicable to dry where it could take a feed that has achieved 6 moisture As such when the product is sticky rod mills are preferred over ball mills.

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The effective ground fault current path is the intentionally constructed low impedance electrically conductive path designed to carry ground fault current from the point of fault back to the source to open the circuit OCPD to clear the fault before extensive damage occurs 250.4 A 5 .

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Open circuit Passed through the equipment Closed circuit Insufficiently crushed Blake jaw crusher Has fixed jaw and pivoted at top 50mm to 1.2 m Jaw width of the blake jaw Rod mill High carbon steel rod 50 mm diameter For sticky materials Hardringe mill Where ball mill segregate themselves Outlet end is conical.

Chat Online### What Is Open Circuit In Ball Mill Crusher Mills Cone

A rod mill in an open circuit may be followed by a ball mill in a closed circuit This is called a double stage circuit and is often a wet process Ball Mill With Open Circuit Grinding SystemChina Ball Mill

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Chat Online### Ball Mill ExplainedsaVRee

If rods are used instead of steel balls the mill is referred to as a rod mill Closed Circuit or Open Circuit Ball mills may operate in a closed circuit or open circuit Closed circuits return a certain amount of the ball mill s output back to the ball mill for further size reduction.

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Shanghai XSM is a rod mill an open circuit is professional manufacturer the main production stone crusher machine Learn More The rod mill performs best when making products having a top size of 4 mesh to 16 mesh operating in open circuit The main feature of the rod grinder lies in Learn More .

Chat Online### Rod Millan overview ScienceDirect Topics

Rod mills are used in an open circuit between crushing and the ball mill They often operate in wet and where the pulp contains up to 50 solid by mass This machine is equally very applicable to dry where it could take a feed that has achieved 6 moisture As such when the product is sticky rod mills are preferred over ball mills.

Chat Online### Rod MillsMineral Processing Metallurgy

May 31 2016 ROD MILL CAPACITIES The above tables list some of the most common Open End Rod Mill sizes Capacities are based on medium hard ore with mill operating in closed circuit under wet grinding conditions at speeds indicated For dry grinding

Chat Online### Quantifying Grinding EfficiencyGrinding

When calculating rod mill power for a rod mill ball mill circuit do not allow for improvement in the ball mill performance If the rod mill feed is produced with open circuit crushing apply a 1.2 inefficiency factor to the power calculated for the rod milling stage only If the rod mill feed will consistently be 80 passing ½ or finer such

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