### Outotec Grinding technologies

004 Outotec Grinding technologies A full range of mills for wet and dry grinding The demands of hard rock mining and industrial minerals operations require a diverse range of grinding mills for both wet and dry applications. AG and SAG mills are currently the industry standard for primary milling and Outotec provides both high aspect or low

### Reprint - Siemens Global Website

of the mill critical speed at which the drive has to provide the rated power. The rated speed of the gearless drive corresponds to a rated converter frequency of 6 Hz to 9 Hz. The rated frequency is defined by the rated speed and the circumference of the mill where the .

### SAG Milling in Australia -Revised Submission

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.

### Ball mill - Wikipedia

The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous and non-ferrous metals. The ball mill can grind various ores and other materials either wet or dry.

### MONSAG: A new monitoring system for measuring the load ...

The outlined method was applied in a 36 × 17 ft −15 000 HP (11.2 MW) variable-speed semiautogenous (SAG) mill for copper ore concentration with nominal throughput of 24 000 tons per day. The mill is of the ring-motor type driven by a cycoconverter.

### Autogenous and Semiautogenous mills -

AG/SAG mills are often the optimum solution for wet grinding (achieved in a slurry 50 to 80 percent solids). AG/SAG mills can accomplish the same size reduction work as two or stages of crushing and screening, a rod mill, and some or all of the work done by a ball mill. All because of the range of mill sizes available, AG/SAG milling extends ...

### Modelling SAG milling power and specific energy ...

Modelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles ... the SAG mill critical speed; Pc = SAG mill power consumption (kW); % 600 +100 = % of the fresh feed in the size range 152 +25 mm. M. Silva, A. Casali/Minerals Engineering 70 (2015) 156–161 157.

### 2 0 0 6 - Manta Controls

The Telfer Train 1 SAG Mill Operational data was collected for a six week prior to the installation of the Manta Cube. Four sets of SAG mill operational data are graphed as histograms in Figure 10. These are, 1. The SAG mill speed (rpm) 2. The SAG mill power (MW) 3. The SAG mill feed rate (tph) 4. The SAG mill weight (tonnes) Figure 10.

### AN OVERVIEW OF THE DESIGN, CONSTRUCTION, .

Variable speed was required for the SAG mill. Various options were considered to meet the specified speed range of 65 to 85% of mill critical speed, and the final selection was the IES Hyper-Synchronous drive Slip Energy Recovery (SER), in conjunction with Wound Rotor Induction motors (WRIM).

### Choosing a SAG Mill to Achieve Design Performance

the correct power required to grind ore in a SAG mill, by developing ore hardness variability functions for the ore body to be mined. This paper describes the next step in the SAG design process, which is choosing a SAG mill to accomplish the required specified design performance.

### Choosing the Right Motors for your Mills - SAGMILLING.COM

Choosing the Right Motors for your Mills Alex Doll and Derek Barratt DJB Consultants, Inc., Canada ... variable speed is cost-effective for SAG mills –Variable speed for ball mills depends on the ... Select Speed •Want the widest possible range of operating conditions. Case Study

### Modelling: Transfer size limits - SAGMILLING.COM

The model assumes all SAG mills are variable-speed; if a fixed-speed mill encounters this condition, it will completely grind out and operators will probably be forced to stop the SAG mill. Pick your mills sizes to avoid secondary mill limited conditions. This transfer size is NOT a prediction

### (PDF) Milling curves as a tool for characterising SAG mill ...

Milling curves as a tool for characterising SAG mill performance ... as sometimes required for ... and given as a function of mill speed. The wide range of milling configurations coupled with ...

### Ring gear drives huge grinding mill | Machine Design

By this summer, a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravel-sized bits for smelting and refining. The largest ring gear will make it happen

### Mill (grinding) - Wikipedia

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.

### CMP Paper 16.10.09 Final - ABB Group

The central driven mill solution is found on the lower power range of the mills due to the high torque that has to be transmitted to the mill through the torque tube at the charge or discharge side of the mill. Single and dual pinion configurations can be powered by low speed synchronous motors

### Ring-geared mill drives - Grinding | ABB

ABB continuously extends technical and performance frontiers of ring-geared mill drive (RMD) technology to fit your site requirements. We provide optimized mill drive solutions for all types of ring-geared mills: low and high speed, single and dual pinion, with and without a gearbox — all designed for reliable, long life and low maintenance ...

### Design of the 40 foot SAG Mill Installed at the Cadia Gold ...

DESIGN OF THE 40 FOOT DIAMETER SAG MILL INSTALLED AT THE CADIA GOLD COPPER MINE ... sizes followed two years of study and evaluation of a wide range of ... a variable speed SAG mill .

### Mining Industry: What is the difference of ball mill ...

Dec 06, 2015· Most mills used in mining rely on impact to breakdown rock to a suitable size for downstream processing. The impact can be rock on rock such as in an Autogenous Grinding (AG) mill, rock and a small ball charge (~10%), used in Semi Autogenous Grind...

### SAG Mill Grinding Circuit Design

In my experience, SAG Mills are normally variable speed, and Ball Mills are normally fixed speed. There are multiple ways to provide variable speed, the common ones are WRIM+LRS+SER or SCIM+VSD, the top of the range is gearless mill drives.

### Advanced Simulation for Semi-Autogenous Mill Systems: A ...

Advanced Simulation for Semi-Autogenous Mill S ystems: A Simplified Models Approach 147 description it is necessary to consider the relationship between the feed stream and mill charge level. This relationship is known as the transport rate and is probably the least developed aspect in models proposed so far (Apelt et al., 2002 a,b).

### What is an inching drive? - motioncontroltips

May 02, 2018· A variable speed drive can generally provide inching or creeping capabilities — which eliminates the need for a separate inching drive — as long as the motor is capable of operating within the speed range required for inching.

### Understanding Variable Speed Drives (Part 2) | Electrical ...

Very often VFDs have been applied to applications where all that was required was a "soft start" reduced voltage controller. The need for the VFD should be based on the ability to change the load's speed as required. In those applications where only one speed change is required.

### Model:Bond/Barratt SABC Models - SAGMILLING.COM

The SAG mill specific energy consumption (E SAG) is calculated using the 1979 Barratt equation and the ball mill specific energy consumption (E bm) This model includes a phantom cyclone effect in the equations due to the ball mill being calculated by difference and not being calculated by the normal Bond equation. The resultant operating work ...

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