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US3739993A - Grinding mills - Google Patents

An autogenous grinding mill of large diameter has curved lifters to give improved radially inward displacement of reduced material, after passage through the primary grates; and secondary grates in the form of box sections combined with the curved surfaces of the lifters, for segregation of totally reduced fines, with passage of intermediately sized material back to the mill reduction section.

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Utah International Island Copper Complex, Canada

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.

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Mill (grinding) — Wikipedia Republished // WIKI 2

SAG is an acronym for Semi-Autogenous Grinding. 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' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

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Autogenous Mills, How Do They Work? - mine-engineer

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 .

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Blasting For Improved Autogenous Milling

Blasting for improved autogenous milling at hibbing, the htc processing consists of nine 36ft diameter autogenous grinding mills, two stages of magnetic separation, four balling drums per indurating line and three traveling grate pelletizing machin, autogenous mill is the key equipment of beneficiation equipment for grinding after. Get Price

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Mill (grinding) - IPFS

SAG mills are essentially autogenous mills, but utilize grinding balls to aid in grinding like in a ball mill. A SAG mill is generally used as a primary or first stage grinding solution. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42' (12.8m) in diameter, powered by a .

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Autogenous mills, semi-autogenous mills and ball mills for ...

supported grinding mills up to the largest sizes. SAG/ball mill circuit incorporating pebble crushers and a POLYCOM® high-pressure grinding roll. SAG and ball mill for gold ore grinding. One of three SAG mills with 9.75 m diameter and 2 x 4000 kW drive power. These mills operate in conjunction with ball mills for iron ore grinding in Iran.

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Aerofall mill as autogenus and semi-autogenous mill

The AEROFALL mill can be used for drying and grinding materials that tend to cake onto the equipment and have bad conveying and handling properties. Depending on the mill diameter, it can accept ores with lump sizes of up to and exceeding 300 mm and with moisture contents of up to 20%.

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Ball Mill Critical Speed & Working Principle - YouTube

Jun 19, 2015 · If 75 percent of critical speed is considered desirable for efficient grinding in a 2.4 meter (8 foot) diameter mill, then the same will be true for a 5.0 meter (15½ foot) diameter mill.

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Autogenous mill, Ag Mill, Semi-autogenous Mill, Ball Mill ...

In this case, Xinhai efficient autogenous mill solved these problems effectively. Xinhai efficient autogenous mill can achieve two and three stage crushing, part or all crushing of ball mill and rod mill, it is suitable for the coarse grinding after coarse crushing.

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Predicting the specific energy of autogenous ... - DeepDyve

Mar 01, 2004 · Read "Predicting the specific energy of autogenous and semi-autogenous mills from small diameter drill core samples, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

  • Published in: Minerals Engineering · 2004Authors: S MorrellAbout: Grinding · Indexation · ComminutionGet Price

AG mills – Ideal for finely grinding competent ores -

Autogenous mills, or AG mills, can accomplish the same size reduction work as two or three stages of crushing and screening. Often used in grinding at modern mineral processing plants, AG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.

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Predicting the specific energy of autogenous and semi ...

1. Introduction. It is generally recognised that the most accurate means for predicting the specific energy of an autogenous (AG)/semi-autogenous (SAG) mill circuit is to pilot the circuit using a 6 ′ × 2 ′ mill (Mosher and Bigg, 2001).However, one of the major drawbacks of this approach is that a relatively large sample is required to do so.

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Mill (grinding) : definition of Mill (grinding) and ...

SAG mills are essentially autogenous mills, but utilize grinding balls to aid in grinding like in a ball mill. A SAG mill is generally used as a primary or first stage grinding solution. The SAG mills use a minimal ball charge of 6 to 15%. SAG mills can be as large as 42' in diameter.

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Comminution - Wikipedia

For comminution of finer particle size ranges (20mm > P 80 > 30 μm) machines like the ball mill, vertical roller mill, hammer mill, roller press or high compression roller mill, vibration mill, jet mill and others are used. For yet finer grind sizes (sometimes referred to as "ultrafine grinding"), specialist mills .

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Autogenous Grinding Mill - Sepor

Designed to do autogenous or semi-autogenous grinding, with the proper length to diameter relationship, contour of the mill heads, and placement of internal lifters and deflectors. The 6′ X 2′ continuous feed Autogenous or Semi-Autogenous Mill may be used to scale up results obtained to any of the larger plant operational mills, such as the ...

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US3404846A - Autogenous grinding mill - Google Patents

1. a combined crushing and grinding mill in which the rock itself is used for grinding, comprising a generally horizontal rotatable drum having a cylindrical wall and two generally smooth vertical end walls, the ratio of the interior diameter of the drum and the interior length being of the order of 3 to 1, means for feeding coarse feed material into said mill, means for withdrawing the ...

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(PDF) Design of a typical Autogenous Mill: Part-II

Design of a typical Autogenous Mill: Part-II ... Mill Shell 3900 mm diameter inside liners . 1250 mm length inside liners . Mill Operating Speed 16.37 rpm . Design Mill Charge 45 % by volume maximum .

TECHNICAL NOTES 8 GRINDING R. P. King

8-3 Centrifugal force outward Fc mp& 2 Dm 2 (8.1) & is the angular velocity, mp is the mass of any particle (media or charge) in the mill and Dm is the diameter of the mill inside the liners. Gravitational force Fg mpg (8.2) The particle will remain against the wall if these two forces are in balance ie.

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Outotec Grinding technologies

autogenous (SAG) mills, autogenous (AG) mills, ball ... diameter. As with the hydrodynamic sleeve bearings, ... Outotec Grinding technologies 007 the mill drive train to be brought closer to the mill, which in turn allows for smaller foundations and lower installation costs.

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Autogenous and Semi-Autogenous Mills | FL

Rely on our proven track record of SAG and AG Mill superiority. Since the early 1980s, we have been designing and manufacturing Semi-Autogenous (SAG) and Autogenous (AG) Grinding Mills under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only.

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