The spilling of the sag mill over the feed trunnion indicates that the volume of slurry inside the mill (hold-up) has increased so much that the mill starts to operate similar to an overflow mill. This situation arises due to the poor performance of its discharge assembly, consisting of a …
SAG mills (see Figure 1) O is the depth of the pulp lifter expresse d as a fraction of mill diameter; and k i and k j are constants. 149 For large-scale mills, the pulp discharge flow can be determined by combining equations (4) and (5) as follows: m Q d= J (8) The calculation procedure can be transformed in an iterative numerical sequence.
F8.8 4.8 m SAG mill ('diameter' represents nominal diameter, and 'length' of the mill represents the effective grinding length inside the end liners and discharge grates), F6.2 9.5 m overflow ball mill and closed stockpile (maximum storage capacity at 120,000 t, effective storage capacity at 39,000 t). Minerals 2016, 6, 127 2 of 9
done in a SAG/ball mill circuit with no coarse recycle classification of the SAG mill discharge. The primary grinding mill is an 18 ft. diameter x 9 ft. EGL, 1500 HP variable speed SAG mill and the secondary mill is a 13 ft. diameter x 21 ft. long, 2000 HP fixed speed, ball mill. When
grate discharge sag mill. used for SAG and ball milling with minor differences for the way the charge density is calculated and whether the mill is a grate discharge most of the SAG mills or overflow discharge typically a ball mill Within the classification there are also two …
SAG mill power draw models are used in mill design and grinding circuit modelling to predict ... D, mill effective diameter, (m) the nominal diameter inside the liners of the mill. Determined as ... pulp slurry, as measured at the mill discharge.
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 ...
Semi-autogenous grinding mills (SAG mills) are tumbling mills that most commonly have a shell diameter-to-length ratio of around two. With this high aspect ratio, SAG mills generate both thrown and cascading ball-milling actions with shell linings shaped to lift and to throw alloy steel grinding balls of up to 150 mm (6 in.) in diameter. These
sag mill discharge diameter - opgebird.nl The S mill is a 4.9 m diameter by 7.0 m long Allis grate discharge mill, driven by a 1,870 kW motor. The mi
Pulp Lifters and Cone Discharge of SAG Mills Cone discharge design affect: • Discharge flow capacity (then, mill capacity) • Slurry trajectory • Slurry return from the trunnion • Use of the trommelarea for clasiffication • Excessive wear in preferential areas of the trommel 1 9 8 7 6 5 4 3 2 1 0 1 1 1 2 1 3 1 4 1 6 5
Increased Profits Through Mine-And-Mill Integration Influence Of Discharge Pulp Lifter Design On Slurry Flow In Mills Large Diameter SAG Mills Need Large Diameter Ball Mills - What Are The Issues Modelling And Scale-Up Of High Pressure Grinding Rolls Modelling Approaches And Their Application In Comminution Circuit Design
sag mill discharge diameter in mexico; sag mill discharge diameter in mexico. At an open pit polymetallic mine in Mexico there were problems afoot in the two 38 ft diameter SAG mills At the heart of things the design of the steel discharger linings Adopted to reduce the number of lining pieces and thus shorten installation time the design was ...
By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading …
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. The …
sag mill discharge diameter - alispezzate.it When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4
SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option
with discharge housing. 6 Mill diameter [m] 1 0 2 3 4 MH Rod mill MH Ball mill MH SAG mill 500 1000 1500 2000 2500 3000 Maximum installed power [kW] All load-bearing structures in our MH Series mills are designed according to Outotec design standards to ensure safe and reliable operation.
Accordingly, the mill power consumption decreased from 8.4 to 5.16 kWh/t (a nearly 40% reduction), and the fresh feed flow rate increased from 515 to 615 t/h (a …
SAG MILL DISCHARGE SCREENS TROMMEL vs. 2013 12 22 currently use a 1 inch grate in the mill that wears out to probably 1 1/4 inch. We ve had 2 inch grates in the mill and we ve even had 2 1/2 inch grates just to see what they would do when we wanted to measure the circulating load.
sag mill discharge diameter. SAG MILL DISCHARGE SCREENSTROMMEL vs VIBRATING Tony Moon RTZ What I'd like to talk about is probably one of the nastiest bits of mill design for a grinding circuit and that is the choice of what do you use on a SAG mill discharge Do you use vibrating screens or trommel screens What many of you probably don't realize is that at
down menu. The mill diameter input relates to the inside-shell dimension. The model actually requires the inside liner diameter and hence the liner thickness must also be input. The required length to be input depends on whether the mill is an overflow or a …
MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia.
SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING Tony Moon, RTZ ... The diameter of the trommel for the 34-foot mill is 13.5 feet and the screen surface length is almost 13 feet. This gives us about 550 square feet of screen area, for roughly 30,000 tons a day or 1,300 tons an hour. These trommels were
The SAG mill is 26 diameter x 12 3 EGL and powered by 4 500 HP motor driven by a variable speed LCI drive that can control the mill speed from 36 to 80 of critical speed depending on ore type and operational demands ... done in a SAG ball mill circuit with no coarse recycle classification of the SAG mill discharge The primary grinding mill is ...
Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAGAG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
The primary ball/SAG mill discharge is one of the most severe duties in mineral processing. The suction wearplate is subjected to rapid wear due to high solids concentration and the coarse nature of the slurry. Goulds developed a proprietary process to locate and mold ceramic rods into the rubber liner for the optimum combination of hardness
