Every mining operation has a unique grinding process. Fruitful has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.
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Jan 01, 2015· For example, for an 36′ × 17′ SAG Mill, with a power consumption of 11.7 MW, operating at 73% solids, 13.5% balls charge and at 76% of the critical speed, with 50% of the feed in the size class −6″ +1″; it could be possible to increment in 2% the balls charge (to 15.5%), reducing the % −6″ +1″ to 34.8%, with no changes in the
Oct 12, 2017· Today we will learn about difference between sag mill vs ball mill. A mill is a machine by which solid or hard materials are broken into smaller pieces by means of grinding, crushing or cutting. This commutation is an essential part of many processes. Various kinds of mills are there with which different material processing takes place.
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many processes.There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand (e.g., via a hand crank), working animal (e.g., horse mill), wind or water ().
• Operating the SAG mill in a optim al speed range (65-75% critical); • Reducing the ball size in SAG m ill from 5 to 4 inches balls; • Returning up to 20% of the c yclone underflow back to
water usage. The crushed ore is transferred to a semiautogenous (SAG) mill or ball mill where the ore is further reduced in size. Water is added to the ball mill, in which a slurry that usually contains from about 20 to 55 percent solids is produced (Singh, 2010; International Mining, 2011) (see fig. 2). The
Optimization of mill performance by using online ball and pulp measurements In the platinum industry, by increasing the solid content in the slurry, the product becomes finer. At a higher percentage solid than 73 to 74%, the product becomes coarser again. At this level, a
• Operating the SAG mill in a optim al speed range (65-75% critical); • Reducing the ball size in SAG m ill from 5 to 4 inches balls; • Returning up to 20% of the c yclone underflow back to
Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of AG and SAG grinding mills. Generally, the discharge from AG/SAG mills consists of one or both of the following components: slurry (water and finer particles) and pebbles (20-100 mm).
Typically 25 for SAG mills and 32 for ball mills. Percent solids (number) Weight percent solids in the feed slurry. Typically 70 to 80. Pinions Quantity and type of mill motors (gearless, single or twin pinion) Speed (number) Rate of rotation of the mill. Typically 72 to 78 percent
Mill power transmission loss, estimated, [%] 5% Feed slurry percent solids, [%] 65% New feed rate operating average, [DTPH] 2265DTPH Maximum motor power, [kW] 19.000 kW Table 1. General Characteristics of SAG1 and SAG2 Process Control The two main variables for controlling the SAG mills are feed and speed. Feed is presently
Fig. 1. SABC A/B milling circuit. Scw = solid concentration by weight fraction in the SAG mill feed; Jb = balls charge (bulk fraction of the SAG mill volume); N/Nc = fraction of the SAG mill critical speed; Pc = SAG mill power consumption (kW); % 600 +100 = % of the fresh feed in the size range 152 +25 mm.
LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the
Jul 01, 1975· The attrition mill is a device for mechanically reducing solid particle size by intense agitation of a slurry of material being milled and coarse milling media. For example, in 10 hours of milling, specific surfaces of 40 and 25 m 2 /g were obtained for alumina and barite, corresponding to 38 and 56 nm equivalent spherical diameter
or percent solids (%) for each sample stream. Absolute one-sigma accuracy is typically 5 g/l for density and 1 unit % for solids by weight. pH meter option The pH of the slurry secondary sample stream is measured by optional pH sensor. Range 0–14 pH, 0–80 °C. Saline-water option If saline fl ush water is used, the PSI 300 can be supplied
Concentrate (in the form of slurry containing 65% solids by weight) is pumped to Portsite through four 115 km-long slurry pipelines. Upon reaching Portsite, the concentrate is dewatered until only 9% moisture content remains, and is then shipped for sale. SAG Mill, Ball Mill, and Flotation.
• The ball mill feed is 60 percent plus 106 µm. • The ball mill discharge is 50 percent plus 106 um. • The circuit CSE is (60 percent + 50 percent)/2 = 55 percent. This is the estimated percentage of plus 106 µm solids in the ball mill, and also the percentage of the ball mill
wC, pulp slurry percent solids, (w/w) the weight percent solids of the solid component of the pulp slurry, as measured at the mill discharge. PDCS, power draw at DCS, (kW) the power draw of the mill as observed on the plant distributed control system.
Jan 01, 2009· The rate constant is related to liner type, liner shape, wet or dry grinding, charge, ball percent, solid percent, mill speed, and etc. Case Study The Sarcheshmeh concentration plant has a 9.75 x 4.88 m constant speed (10.5 rpm) SAG mill with two 5500 hp motors, which could rotate in
This mixture enters the semi-autogenous grinding (SAG) mill, where the milling process begins. Inside the SAG mill (36 feet in diameter), the dry material is mixed with water during milling. The mixture of ground material and water is known as pulp. The pulp from the SAG mill travels into a cylindrical sieve known as a trommel.
A set of experimental test work has been carried out in a continuous pilot ball mill of 0.41m X 0.56 m (diameter X length) at different mill speeds, percent solids and discharge mechanism. The results of study on material flow through a grate discharge tumbling mill verses an overflow tumbling mill are presented to emphasize the effect of
• The ball mill feed is 60 percent plus 106 µm. • The ball mill discharge is 50 percent plus 106 um. • The circuit CSE is (60 percent + 50 percent)/2 = 55 percent. This is the estimated percentage of plus 106 µm solids in the ball mill, and also the percentage of the ball mill
Jan 01, 2009· The rate constant is related to liner type, liner shape, wet or dry grinding, charge, ball percent, solid percent, mill speed, and etc. Case Study The Sarcheshmeh concentration plant has a 9.75 x 4.88 m constant speed (10.5 rpm) SAG mill with two 5500 hp motors, which could rotate in
The concepts for operating SAG mills have been inherited almost entirely from conventional ball mills. However, these mills operated under a constant ball load Low mill filling and solids percentage must be compensated per seacting on feed rate and water flow, respectively. The
Typically 25 for SAG mills and 32 for ball mills. Percent solids (number) Weight percent solids in the feed slurry. Typically 70 to 80. Pinions Quantity and type of mill motors (gearless, single or twin pinion) Speed (number) Rate of rotation of the mill. Typically 72 to 78 percent
A set of experimental test work has been carried out in a continuous pilot ball mill of 0.41m X 0.56 m (diameter X length) at different mill speeds, percent solids and discharge mechanism. The results of study on material flow through a grate discharge tumbling mill verses an overflow tumbling mill are presented to emphasize the effect of
wC, pulp slurry percent solids, (w/w) the weight percent solids of the solid component of the pulp slurry, as measured at the mill discharge. PDCS, power draw at DCS, (kW) the power draw of the mill as observed on the plant distributed control system.
This mixture enters the semi-autogenous grinding (SAG) mill, where the milling process begins. Inside the SAG mill (36 feet in diameter), the dry material is mixed with water during milling. The mixture of ground material and water is known as pulp. The pulp from the SAG mill travels into a cylindrical sieve known as a trommel.
PDF On Jan 1, 2011, A. P .P van der Westhuizen and others published Milling curves as a tool for characterising SAG mill performance Find, read and cite all the research you need on ResearchGate
mill operation as the operating parameters vary. The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive's mechanical components based on Doll (2012) are used to determine the motor output power, P.
Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 250 microns.; The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges
SAG mill under analysis. The operation of SAG mills is extremely sensitive to mill lling; from a qualitative point of view, for a given ll level and constant feed rate and speed, if the OSD becomes slightly coarser then the ll level will increase, and on the other hand, if the OSD becomes slightly ner then the ll level will decrease.
Oct 25, 2018· Moly-Cop Tools TM Remarks Molino SAG Antamina : 38'f x 19'. Mill Power, kW Mill Dimensions and Operating Conditions 5842 Balls Diameter Length Mill Speed Charge Balls Interstitial Lift 5729 Rocks ft ft % Critical Filling,% Filling,% Slurry Filling,% Angle, (°) 1942 Slurry 37.40 19.00 80.00 28.00 9.00 65.00 40.00 13513 Net Total rpm 10.02 5.00
SAG Mill Discharge. Controlling the feed and discharge of a mill is mostly a stabilisation exercise you need to be able to quickly and accurately control the mill feed rate. If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at the new target in a short period of time. The feed rate setpoint can then be tied
Added a warning to Austin SAG model if %solids is outside the range of 60% to 80% solids. 2016-01-15: Bug fix and more translations Fixed a long-standing bug where the liner thickness for newly created mills reverts to the default liner thickness the second time the mill is edited.
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