Feed Size: All passing 8″ Product Size: All passing 6 mesh with 80% passing 20 mesh. Net power from pilot plant: KWH/ST Mill, gear and pinion friction multiplier: Mill Power required at pinionshaft = (240 x x ) ÷ = 5440 Hp Speed reducer efficiency: 98% 5440 Hp ÷ = 5550 HP (required minimum motor output power).
WhatsApp: +86 18838072829
The designs of autogenous and semiautogenous (SAG) grindings mills are described followed by the description of their methods of operation in grinding circuits involving crushers and ball mills. Methods of estimating SAG mill volumes, mill charges, feed size and power consumptions and optimum speeds of rotation during operation are described. ...
WhatsApp: +86 18838072829
Figure 3 shows a typical semiautogenous (SAG) circuit with feed coming directly from a primary crusher, and the semiautogenous mill product going to the separation process. Many similar semiautogenous circuits are built today because they are simple and flexible, lend themselves readily to high tonnages and usually are lower in capital cost ...
WhatsApp: +86 18838072829
Process. 46 (1996) 5372 Table 3 Mill data and predicted flowrates 67 OK Tedi Paddy's Flat Mill diameter (m) Mill length (m) Mill speed (% critical) 74 76 Open area (laa2) Estimated fiactional pulp holdup (Jp~) Estimated fiactional total mill filling (Jr) Mean relative radial position (3') 0. ...
WhatsApp: +86 18838072829
The autogenous mill will grind the material to the extent that the content of the particles with particle size < mm accounts for 2050% of total quantity of product, and crushing ratio is, which is over 10 times that of ball mill and rod mill. The maximum particle size of the lump ore fed into autogenous mill is 300350 mm.
WhatsApp: +86 18838072829
exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell,, van der Westhuizen,, Mainza, 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity.
WhatsApp: +86 18838072829
1. Determine the maximum feed size. 2. The minimum feed size to the crusher, must always be less than 25mm (1"), in either open or closed circuit. 3. Determine the total tonnage throughput of the crusher: a) Open Circuit Refer to capacity tables on previous pages, detailing maximum and minimum recommended tonnages.
WhatsApp: +86 18838072829
b) Semi autogenous grinding in which the pebble fraction of mill discharge (+½ in.) is taken out through pebble ports for separate crushing and ball milling. The minus ½ in. fraction of mill discharge is recycled to the SAG mill through a classifier. The circuit is called SACB: Semi autogenous/ Crusher/Ball mill.
WhatsApp: +86 18838072829
The mill is powered by two 5500 hp motors. Nominal mill speed is (78% critical) with a top speed of The mill discharges through a grate with 3″ pebble ports onto a 14′ dia. x 13′ trommel screen with ¾" openings. On January 19, 1991 the mill was brought on line as a fully autogenous mill without pebble crushing.
WhatsApp: +86 18838072829
When used with grinding media ("balls") they are called SAG (semiautogenous grinding) and when only rock is present they are called AG (autogenous grinding) mills. The most common secondary mill is a ball mill in which relatively fine feed particles ( mm top size) are ground in a charge consisting predominantly of steel balls.
WhatsApp: +86 18838072829
2 AG mill + a recycle crusher Competent ore relatively homogenous (the recycle crusher is used to balance the rate of impact breakage within the circuit) 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.
WhatsApp: +86 18838072829
Grinding is easily enabled in autogenous mills by attrition. Also, autogenous mills have grate discharges, so as to retain the coarse grinding media in the mill while dispatching the fine particles. The other benefits of using autogenous grinding include reduction of metal wear, and elimination of secondary and tertiary crushing steps.
WhatsApp: +86 18838072829
The charges for autogenous grinding tests were in the size of −80+50 mm (3 kg) as grinding media and −10,000+1000 μm (2 kg) as feed material. Ball milling (32 min), 16 min of rod milling and 256 min of autogenous milling were found to give similar size distribution providing a comparative work to be done.
WhatsApp: +86 18838072829
The maximum mill filling possible. An 8 m × 4 m SAG mill was progressively filled through a charging chute m in diameter. The charge consisted of mineral plus balls plus water. The total charge volume was increased progressively such that the fractional fillings of the mill volumes after each increase were:,,, and
WhatsApp: +86 18838072829
energies Article Operation Analysis of a SAG Mill under Di erent Conditions Based on DEM and Breakage Energy Method Qiyue Xie 1, Caifengyao Zhong 2, Daifei Liu 1,*, Qiang Fu 1, Xiaoli Wang 3 and Zhongli Shen 1 1 School of Electrical Information Engineering, Changsha University of Science Technology, Changsha 410114, China; qyxie168 (); fuqiang0812 ();
WhatsApp: +86 18838072829
An Autogenous Milling defined as used in this study; the term Autogenous milling means a process in which the size of the constituent pieces of a supply of rock is reduced in a tumbling mill ...
WhatsApp: +86 18838072829
Autogenous Mill 10 6400 353 18 Ball Mill 5 2600 126 21 Regrind Ball Mill 740 39 19 Tower Mill 520 12 42 IsaMill 3 1120 3 280 3 3) 23/m) Ball Mill ... maximum density will be limited by viscosity, and viscosity effects are much more apparent for fine products. Though it is ore dependant, as a general guide sub 10 ...
WhatsApp: +86 18838072829
In mineral processing: Grinding Autogenous mills operate without grinding bodies; instead, the coarser part of the ore simply grinds itself and the smaller fractions. To semiautogenous mills (which have become widespread), 5 to 10 percent grinding bodies (usually metal spheres) are added. Read More
WhatsApp: +86 18838072829
The hypothetical charcoal plant is located at or near a saw mill and the product charcoal is transported to a steel plant (~300 km away). ... These difficulties can be overcome if autogenous pyrolysis is used. The process can be arranged so that the material is heated to the maximum pyrolysis temperature spontaneously by the heat of internal ...
WhatsApp: +86 18838072829
The Tidco autogenous crushing mill has sparked a worldwide wave of interest from the mining community. As a new tool to enhance reduction and liberation, this unique machine presents many opportunities for costsaving and production increases in existing and new concentrators. As the rockrockonrock concept is innovative and ...
WhatsApp: +86 18838072829
SAG mill. SAG is an acronym for semiautogenous 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' () in diameter, powered by a 28 MW (38,000 HP) motor.
WhatsApp: +86 18838072829
in variable speed mills, this may be achieved by reducing mill speed; and in both cases this may be achieved by design by increasing the lifter face angle. Traditionally, the number of shell lifters used in a SAG mill is equal to twice the number of the feet in the mill shell diameter (, a 34ftdiameter mill shell would have 68 shell lifters).
WhatsApp: +86 18838072829
This paper discusses, and is centered on the Appendix of this paper that compiles all Autogenous and SemiAutogenous mill installations worldwide, through the end of March 2015. Updates have been ...
WhatsApp: +86 18838072829
In mining, a SemiAutogenous Grinding mill (SAG) is the equipment used at mineral processing plants in the size reduction process, making the ore suitable for the next stage of flotation. Its use lies in significant processing and reduction capability offered by this kind of mill, where maximize the operational continuity and production is ...
WhatsApp: +86 18838072829
A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
Copyright © 2023 GMC Co., Ltd. SiteMap
