grinding circuit was replaced by two autogenous grinding mills (9.8m diameter x 4.4m length) in June 1991. These mills were originally designed to operate in open circuit or ... the deep copper ore body (3000 series), at a rate of 6.0 Mtpa. Page 147
autogenous grinding and ball mill grinding—these mills are known as Semi-Autogenous Grinding or SAG mills. Water is added to the ore during the grinding process. This creates ‘slurry’, which is then used to transport the ore throughout the remainder of the extraction process. SAG Mills constitute a recent innovation in terms of ore
Autogenous Grinding of Disseminated Copper Ores. autogenous grinding mill for copper ore A study has been made of wet autogenous grinding of disseminated copper ores including testing of a large number of samples from Kennecott Copper Corporation’s Chino mine The efficiency with which the various samples could be ground was found to vary over an
Autogenous Grinding Setengah In Island. 20171219 iron ore and grinding ball mill definition malaysia mill sag mill semi autogenous grinding mill fort knox mill a sag mill is characterized by its large diameter and short length ball mills are used for wet grinding iron ore goldcopper ore nickel ore and graphite grinding mill gypsum powder factory for malaysia
An Autogenous (AG) Mill is a t umbling mill which utilizes t he ore itself as grinding media. For some ores, an auto genous mill combines t he size
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Jan 14, 2021 Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each other and how they can be used to obtain an accurate design for the grinding mills required for
Dizon Copper Operation, Benguet Corporation, San Marcelino, Zambales, Philippines The semi-autogenous grinding mill is the bottleneck whenever treating hard and finely fragmented ore at Benguet Corporation's Kaline Concentrator. Low milling rates result from very high and fluctuating mill power draw. Attempts
autogenous mill(s) when designing a grinding circuit. ARMC generally recommends that, in these cases, the power-based design grindability tests (work index tests) are performed in conjunction with the DWT, to limit the risk in mill selection. • When designing a grinding circuit that involves an autogenous mill. In addition to autogenous mill
Oct 01, 2020 From the development of a semi-autogenous grinding model based on effective grinding rates and internal classification presented during the nineties (Magne et al., 1995) the state of the art of the mathematical structure of this model was updated, presenting the development of each subprocess from the inside of the mill in detail, considering grinding
Semi-Autogenous Grinding (SAG) Mill. Wet or dry; Higher capacity than A-G mill grinding; Primary, coarse grinding (up to 400 mm feed size) Grinding media is grinding feed plus 4-12% ball charge (ball dia.100- 125 mm) High capacity (short retention time) Less sensitive to feed composition (critical size material) Semi-Autogenous Mill
T1 - EFFECT OF AUTOGENOUS AND BALL MILL GRINDING ON SULFIDE FLOTATION. N2 - The effects of grinding on the floatabilities of copper-nickel sulfides from Duluth gabbro were investigated. At the same mesh-of-grind copper, nickel, and cobalt recoveries were higher and residual sulfur in the tailings was lower with autogeneously ground pulps
Nov 26, 2019 –Compared with the traditional tumbling mill, the autogenous mill reduces the consumption of lining plates and grinding media, thus have a lower operation cost. –The self-grinding machine can grind the material to 0.074mm in one time, and its content accounts for 20% ~ 50% of the total amount of the product
mining process plant grinding sag mill Sales Inquiry. MMG Limited Extraction and Processing. Conventional mining methods are used to remove waste material and extract ore at the a mineral sizer followed by a semi autogenous grinding mill SAG mill The agitated leach plant is partially supplemented by additional copper from a
Jul 20, 2017 Crusher product is typical feed to a ball mill using large diameter balls but not much grinding of 20-25 mm ore can be accomplished in an autogenous mill. Autogenous plus Pebble Mill are an excellent technique if the ore is uniformly hard and competent but it has not been popular because the porphry copper orebodies do not consistently produce sufficient
The autogenous mill can process materials of any property, especially when grinding asbestos, iron ore, copper ore, limestone, gold ore, manganese ore, etc. It has a large grinding ratio, up to 4000-5000, and the feeding size is generally 300-400mm (910mm in special cases). After grinding, the material particle size can reach 0.1mm or less
May 21, 2017 The attraction of semi-autogenous grinding in copper operations is that they can accommodate ores that are hard or soft, wet or dry, sticky or otherwise. The SAG mill can handle everything that is presented to it, regardless of coarseness or fineness, or hardness or moisture content, and from it prepare satisfactory feed for subsequent secondary grinding by
ter x 4.4 m Boliden-Allis Chalmers autogenous mills. Each of the autogenous mills was driven by two 3.2 MW motors (ie. 6.4 MW per mill). The total installed power of the new grinding circuit was 18 MW (12.8 MW on primary grinding and 5.2 MW on secondary grind- ing), compared to the original crushinglgrinding circuit which was
Autogenous grinding is gaining in popularity, as the grinding media costs are much less, and this process does not produce as much slime or fines as traditional rod and ball mills. Autogenous mills can handle both wet and dry operations. In some applications that require the grinding of minerals, such as talc, asbestos, and mica, dry semi-autogenous milling is the
Sep 08, 2021 Autogenous and semiautogenous mills are commonly used in the primary grinding stage in ore processing plants, which excludes medium and fine crushing. The alternative is high-pressure grinding rolls, which can reduce electricity consumption compared with autogenous and semiautogenous grinding
An autogenous mill of ID 6.7 m and an effective grinding length of 2.1 m was fed with ore of SG 3.8 to 20% of its volume. The mill was operated continuously 24 hours per day at 1200 t per day and 75% of the critical speed. The solids in the mill charge were at 80% solids. Estimate:1
Simplify the crushing and grinding process; feeding particle size is 200-350mm, and after the first autogenous grinding, the product particle size reaches below a few millimeter. It is suitable for ore with high content of mud and water; small area taken, low investment
Island Copper's six autogenous grinding mills, each 32 feet in diameter and 14 feet in length, comprised the largest totally autogenous grinding circuit in the copper industry at the time. The grinding mills convert the ore into approximately 230,000 tons annually of copper concentrate and 1,800 tons of molybdenum concentrate. The Client also awarded Fluor the follow-on work
Jan 01, 2016 Mills that use intermediate size rock or pebbles as a grinding medium are also autogenous mills but are known as pebble mills. Mills that grind hard ores with fracture characteristics that do not lend themselves to fully autogenous milling are charged with a small amount of steel balls to assist in the size reduction
Self-grinding machine (AG Mi) and semi-self-grinding machine (SAG Mill) are widely used in power, ferrous and non-ferrous metals mineral processing, chemical, building materials and other industries. They grind a certain size of ore or other materials
Semi-autogenous grinding as described in this investigation report. utilizes conventional rod mill primary grinding of the crushed ore to approximately 14 mesh followed by secondary pebble grinding to the desired degree of fineness, using a portion of the screened lump ore as the grinding media
The biggest characteristic of autogenous mill is large crushing ratio. The autogenous mill has two functions of crushing and grinding. The autogenous mill can directly add the raw ore or the uncrushed ore in the quarry to the autogenous mill. It can grind the material to 0.074mm at one time, which accounts for more than 20% ~ 50% of the total
Dec 01, 2012 Autogenous (AG) Grinding Mill, Semi-Autogenous (SAG) Mills …. Autogenous mills use ore exclusively … The inside liner of AG/SAG mills consists of … ball mill or pebble mill.They can grind run-of-mine rock or primary … More detailed
SAG is an acronym for semi-autogenous grinding. 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%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor
