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The 6 Diameter X 2 Long Continuous Feed AutogenousSemiAutogenous Mill With Base amp Stand Description Designed for autogenous or semiautogenous grinding the 6 X 2 continuous feed Autogenous or SemiAutogenous Mill may be used as a pilot plant to determine the size for larger mills or for small scale milling projects
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Autogenous grinding has two advantages 1 it reduces metal wear and 2 eliminates secondary and tertiary crushing stages thus it offers a savings in capital and operating costs autogenous mills are available for both wet and dry grinding the diameter of autogenous mills is
Autogenous grinding is a process of grinding ore in a rotating cylinder using large pieces of the same ore autogenous mills operate mechanically like ball mills however the media used for grinding differs simply put in autogenous grinding the media is also the material that is being ground whereas in other milling methods steel or
Autogenous mills these mills use coarse ore particles of the material to grind itself grinding is by attrition an autogenous mills diameter is larger compared to its length semiautogenous mills forged steel balls in addition to the coarse ore perform the grinding mill diameter is
Jan 01 2016 it can therefore be concluded that autogenous grinding was not suitable with this particular gold ore but semiautogenous operation with about 8 ball charge was the preferred option based on these test results a 67 m diameter 21 m length sag mill and a 33 m 61 m ball mill were installed for commercial operation in closed circuit
Jan 01 2000 autogenous grinding of pyrite from 19 ktm to 7 tm at 231 kgh in a 22 dm3 chamber for a specific power consumption of 25 kwht presents a highly competitive ultra fine grinding option however the result is typical of the increasing residence time and power required for grinding fine feed in this case less than 20 m to product sizes below
Sag mill semiautogenous grinding mill a sag mill is characterized by its large diameter and short length it rotates tumbling its contents violently causing a breaking action the mill is lined with wear resistant steel liners which are fitted with lifters to assist with raising the load
Features of sag mills youtube jul 22 2014 sag is an acronym for semiautogenous grinding which means that it utilizes steel balls in addition to large rocks for grinding it has a large diameter and short length it rotates tumbling itsget price author iego aspas optimizing your sag mill operation international mining
Sag mills are autogenous mills that also use grinding balls like a ball mill a sag mill is usually a primary or first stage grinder sag mills use a ball charge of 8 to 21 6 7 the largest sag mill is 42 128m in diameter powered by a 28 mw 38000 hp motor 8 a sag mill with a 44 134m diameter and a power of 35 mw 47000
Semiautogenous grinding and autogenous grinding is a powder mill with a large cylinder diameter and a slow rotation the material is fed into the mill through the hollow journal at the feeding end under the interaction of the materials the material crushed to a certain fineness passes through the discharge the hollow journal at the end is
Sag mills are autogenous mills but use grinding balls like a ball mill a sag mill is usually a primary or first stage grinder sag mills use a ball charge of 8 to 21 the largest sag mill is 42 128m in diameter powered by a 28 mw 38000 hp motor a sag mill with a 44 134m diameter and a power of 35 mw 47000 hp has been designed
Ball mills are characterized by their smaller comparatively diameter and longer length and often have a length 15 to 25 times the diameter the feed is at one end of the cylinder and the discharge is at the other sag semiautogenous grinding mill liner and ag autogenous grinding mill liner from hampg use crmo materials as2074 standard
Semiautogenous grinding uses a minimal ball charge in the range of 615 while autogenous grinding uses ore only fullertraylor sagag mills range in size from 43m through 122m in diameter with powers as high as 28000 kw our team of product engineers continually improves sagag mill designs in order to provide the most robust safe
The macperson autogenous grindability test determines the macpherson correlated autogenous work index this can be used in conjunction with the bond rod and ball mill work indices to determine power requirements and to suggest circuit configurations for autogenous grinding ag and semiautogenous grinding sag circuits
Autogenous and semiautogenous mills are typically operated at slightly higher speeds than ball mills of the same diameter these purpose of a grinding circuit is to reduce the size of feed material to a size sultable for either a final product or for further processing further processing may involve a leach
Grinding circuit was replaced by two autogenous grinding mills 98m diameter x 44m length in june 1991 these mills were originally designed to operate in open circuit or with four 690 mm inclined hydrocyclones in closed circuit each autogenous mill was also planned to be followed by one ball mill
Diameter and longer length and often have a l ength 15 to 25 times the diameter sag is an acronym for semiautogenous grinding sag mills are essentially autogenous m ills but
Conga the worlds first 42 foot diameter 28 mw gearless sag mill abstract in 2010 newmont made the decision to purchase a 42 foot ft semiautogenous grinding sag mill from metso and a 28 megawatt mw gearless mill drive gmd from abb for the conga project in peru the test and study work showed that a single line 42 ft sag mill
After the grinding and sorting cycles are complete most of the collected material will result in particulate of 250 1200 micron in size testing has shown that over 98 of the original tooth that is utilized by the smart dentin grinder is ground sorted and recovered in the drawers ready for reuse
Grinding and sizing mining 1 ore stockpile 2 addition of lime to raise ph 3 jaw crusher 4 semi autogenous grinding sag mill water and steel balls added 5 trommel screen remove oversize rock scats 12 magnet separate steel balls 13 scats cone crusher 6 sump 7 primary hydrocyclone classifier 8 sump 9 secondary
Autogenous grinding mill designed to do autogenous or semiautogenous grinding with the proper length to diameter relationship contour of the mill heads and placement of internal lifters and deflectors reduction or elimination of grinding media costs and contamination available in
Equipment autogenous grinding mill size 3900x1450x50mm type air swept discharge capacity rated 20 tph design 30 tph feed material anode mill shell 3900 mm diameter inside liners
3 autogenous and semiautogenous mills 3 ball mills 3 rod mills 3 scrubbers largediameter mill shells are transported to the plant site in sections the sections are then welded together or flangecon grinding systems of the third generation also assure cost
The autogenous grinding technique has found wide use and is widely utilized the world over application of the autogenous grinding technique enables the extent to which the material is primarily crushed to be limited to a maximum lump size acceptable from the aspect of transportation
Autogenous grinding but can be as high as thirty per cent a koppern high pressure grinding roll hpgr unit having a diameter of 1 m a polysius unit having a diameter of 0250 m secondary ball mills a stirred media detractor smd a deswik mill a derrick screen and
Autogenous grinding machines fracture of the media particles also occurs by both impact self breakage and attrition in equation 814 d is the diameter inside the mill liners and le is the effective length of the mill including the conical ends
Apr 09 2015 autogenous grinding ball mill grinding mills hammer mill rod mill roller mill sag tumbling autogenous ag mills are drum mills which consist of horizontally rotating slightly inclined cylinders of large diameter and small length and fitted with lifting bars coarse feed is entering the mill from one end and outlet is at the
Consisting of a large diameter cylinder relative to their length typically 2 or 25 to 1 these mills use large lumps of ore as the grinding media autogenous mills use ore exclusively as their grinding media but if hardness and abrasiveness of the ore does not lend itself well to full ag milling then a small charge of steel balls 6 to 15
Metallurgical contentintermediate autogenous grindingautogenous grinding explainedtest conditionsgrinding characteristics of short mill versus long millobservations and recommendations the third type of mill that i mentioned was an autogenous mill this type of mill uses a completely different type of grinding media the rock itself in conventional milling the ore is crushed to plus or
Autogenous mills semiautogenous mills and ball mills for wet grinding a company of polysius thyssenkrupp grinding plants from polysius have a long track record in wet grind with 975 m diameter and 2 x 4000 kw drive power these mills
Dry and wet autogenous grinding rod mills key characteristics drum diameter without lining mm 2100 3600 drum length without lining mm 3000 5000 rated drum apacity m 3 85 45 motor power kw 200 1000 quantity of grinding medium in drum not over 35 more details