Sep 23 2014 this means that sag mill foundations behave very differently from ball mill foundations 4 mill designer stiffness criteria one of the mill designers performs a calculation to determine the target stiffness of the foundations given the mill and ring motor stiffnesses

Ball mill foundation design mining prominer shanghai ball mill foundation design ball mill structural design gpgeoserviceit ball mill foundation design mill development and operations planenergy mines and high pyrite and low pyrite tailings dewatering and handling designs ball mill wikipedia a ball mill is a type of grinder used to grind and blend materials for use in mineral dressing

How to ensure seismic requirements for sag and ball mills dr axel fuerst abb switzerland baden ch generally the foundation design requires more effort than the seismic design of the gmd simply due to before the gmd and mill structures design and construction of gmds approach to withstand harmful effects to reach a sound design abb

Foundation design of ball mills foundation design of ball mills ball mill maintenance installation procedure 911 metallurgist with this design in the event of some movement the mill and foundation will tend to move as a unit design mill design 8 weeks whether sag or ball mill space is a sensitive subject especially in the conlive chat

The mill product can either be finished size ready for processing or an intermediate size ready for final grinding in a rod mill ball mill or pebble mill agsag 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

The grinding circuit for the copper mountain project consists of one flsmidth sag mill and two flsmidth ball mills figure 1 overview grinding circuit the copper mountain sag mill is 10363 mm 34 feet in diameter and 6096 mm 20 feet long it is a grate discharge mill with an inside diameter of 10363 mm 34 feet and a grinding length of 5334

Ball mill design a survey of australian processing plants revealed a maximum ball mill diameter of 524 meters and length of 884 meters morrell 1996 autogenous mills range up to 12 meters in diameter the lengthtodiameter ratios in the previous table are for normal applications

The model output variables are powerdraw load level ball load mineral discharge rate and size distribution water discharge rate ball throughput bearing pressure pebble throughput and toe and shoulder angles of the internal load 21 sag mill model the particles fed to the mill are ground in the milling chamber and subsequently

3 sag mill 8 15 ball charge variable competency ore 4 high ball charge sag mill 15 to 25 ball charge incompetent ore 5 low ball charge sag mill high mill speed 4 ball charge 90 nc a cross between ag and sag for competent abrasive ores as typically operated in rsa 6 sag mill configurations 3 and 5 with recycle crusher

Single stage sag mills are very beneficial in reducing capex for plants with a staged throughput approach when future tonnage is to be increased the sag mill can feed downstream ball milling to boost capacity fullertraylor sagag mills range in size from 43m through 122m in diameter with powers as high as 28000 kw

Mill foundation comprises of i base block amp ii pedestals for mill pinion motor gear box and inching motor bottom of the base block is supported on the soil 38 m level below fgl whereas its top is at 02 m level foundation spans about 24 m x 7 m in plan it

Sagdesign testing provides sag pinion energy grindability in kwht to within 5 from 152 to 17 mm and bond ball mill work index on sag ground ore from the sag test on the same sample starkey amp associates uses the patented sagdesign technology to calculate accurate mill sizes from measurements on a clients own ore samples

Figure 5 highlow wave ball mill liner materials the selection of the material of construction is a function of the application abrasivity of ore size of mill corrosion environment size of balls mill speed etc liner design and material of construction are integral and cannot be chosen in isolation

To include sag and ball milling the hardness of each sample was measured in terms of sag power index spi for sag grinding and bond ball mill work index bwi for ball mill grinding a further measure the minnovex crusher index ci was also measured for use in the ceet program to determine sag mill feed size kosick and bennett 2001

single stage crushsingle stage sag mills and two stage crushball mill circuits are typically selected for low throughput plants 50 th where personnel costs are a large component of costs sab circuits are typically selected for plants of 05 to 2 mta

22 mw gmd for 28 ball mill 28 mw gmd for a 40 sag mill 28 mw gmd for 42 sag mill whether it is size or an installation at the highest altitude 4600 masl abbs gmds are well positioned to contribute to the building of larger and ever more powerful mills leading the gearless mill

The sagdesign test is performed with a specially designed laboratory sag mill and uses 7 to 9kg depending on ore specific gravity of 38 mm ore the sag product is then used as feed to a bond ball mill work index test the results can be used to determine or confirm sag or ag and ball mill

Specific energy requirements of sab sag and ball mill and sabc sag and ball mill withpebble crushing circuits for mill design purposes ultimately an example is presented to demonstrate the application of this method can be used to evaluate and minimize design risks

Developments in sag mill design and operation over the last few years sag mill manufacturing technology has advanced rapidly the bounds of mill size have been pushed from two directions firstly the advent of ring motors has removed the constraint applied by the power that a

Method of driving sag mills ball mills and other rotating elements several thousand grinding mills have been manufactured and have been in operation for the last century the gearless drive came into the minerals industry in 1980 and as per their reference lists siemens have approximately 60 installations and abb have approximately 85

Primary wet autogenous mill wam and a series of ball mills wam is customary chosen either based on examination of analogous equipment specifications or from the evidence of very expensive commercial and semicommercial testing that requires large sampling much time and high investment 1 the current practice of exploratory design of ore pre

Oct 15 2020 the grinding circuit consists of a sag mill ball mill and cyclones the grinding circuit will be designed to reduce ore from an 80 passing size of 76mm to 40 m the sag mill will be a single pinion low aspect mill operating in a closed circuit the mill has an inside diameter of 38m and an effective grinding length egl of 50m the mill

Mar 14 2007 re manual design of sagballrod mill foundations youngstructural structural 7 mar 07 1827 i have a bit of a long answer here so ill give you a synopsis i dont think an design can be produced manually and i think a preliminary design could

Autogenous semiautogenous and ball mills for wet and dry grinding in our offices all around the world design these cuttingedge turnkey ball mills autogenous mills and semiautogenous mills from thys senkrupp polysius with the foundations are smaller reducing the mills

Nov 26 2019 the biggest characteristic of the sag mill is that the crushing ratio is large the particle size of the materials to be ground is 300 400mm sometimes even larger and the minimum particle size of the materials to be discharged can reach 01 mm the calculation shows that the crushing ratio can reach 3000 4000 while the ball mills

Jun 06 2016 traditionally many engineers approached sag circuit design as a division of the total power between the sag circuit and ballmill circuit often at an arbitrary power split if done without due consideration to ore characteristics benchmarks against comparable operating circuits and other aspects of detailed design including steadystate tests simulation and experience an arbitrary

Oct 19 2016 this is done by using a higher shim at the center than at the ends and tightening the foundation bolts of both ends ball mill sole plate this crown should be between 002 and 003 per foot of length of sole plate for example if the sole plate is about 8 long the crown should be between 016 and 024 ball mill sole plate

Oct 12 2017 1 sag mill is the primary tool for grinding sag mill is used before the other mills ball mill is a secondary and it is used after the sag mill 2 sag mill breaks the raw material into pieces for the further grinding ball mill is used to grind the pieces of raw material into powderlike structures 3

Simple drawing for centrifugal ball mill crusher low cost ore ball mill grinders ecofriendly gold mining the lower illustration is a cad drawing of our millmax 3000 crushing and grinding cell a ball mill is a grinder for reducing hard materials to powder type of ball mills centrifugal and planetary mills are

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