Model predictive control is able to optimize the control of processes that exhibit an integrating type response in combination with transport delays or variable interaction, …
WhatsApp: +86 18221755073
The results are shown below (Table 4) for the 2 new designs (2&3) together with the current design (1). Table 4 – SAG Mill Simulation Results Design Throughput (t/hr) P80(mm) P50(mm) Power(kW) kWh/t 1 1250 3.21 0.69 12750 10.2 2 1420 3.13 0.65 12755 9.0 3 1480 3.11 0.63 12749 8.6 As can be seen a significant increase in throughput is …
WhatsApp: +86 18221755073
design, selection, monitoring and evaluation of mill performance is critical > Mill trajectory modelling can be used to great effect in improving liner design
WhatsApp: +86 18221755073
The SAG mill discharge properties (SMDC) and size distribution (smdc), including the transfer sizes (T 80 … T 20), are estimated by the addition of the estimated primary cyclone feed and oversize crusher feed streams less the SAG mill discharge water flowrate, see Equations (5) to (7) . SMDC tph _ s OSCF tph _ s PCFD tph _ s (5)
WhatsApp: +86 18221755073
Mills require different liner profiles and designs depending on mill size, speed, charge, charge level, type, size of grinding media, expected service life, and – of course – ore size and properties, such as hardness and abrasiveness. SAG mill A SAG mill is usually a primary mill for grinding coarse ore directly from the crushed stockpile.
WhatsApp: +86 18221755073
3.3 Ball Mill Design The ball mill designs also follow the Bond/Rowlings method with comparison with other methods. Again the method of use is the same 3.4 SAG/BM Combined design This is the combined model of the SAG and BM models. The difference is that a provision in the BM model allows for the fact that finished product is in the BM feed.
WhatsApp: +86 18221755073
— SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design ...
WhatsApp: +86 18221755073
The methods used to design SAG mills and SAG grinding circuits have been significantly upgraded in the last eight years. Direct measurements of SAG mill and ball mill pinion energy requirements are now available as test results from SAGDesign testing (patented technology). This fact puts the
WhatsApp: +86 18221755073
Mill body deformation Set-up allowance Bearing deformation Set-up allowance Set-up allowance Gear tolerance couplings Drop charge Frozen charge Thermal expansion • Tested to over 3 x106 cycles • Verified torque sharing • Verified tooth contact pattern • Verified dynamic behavior • Ran at full speed SAG mill 36 ft. dual drive SAG mill ...
WhatsApp: +86 18221755073
Selecting Optimum Liner Design • For friable ore = High throughput (lower SAG mill load) – Design objective = maintain optimum SAG mill load – Requires lower operable speed range to maintain load – Select liners for life (i.e. high face angle, high lifters) – Longer liner life • For competent ore = low throughput (high SAG mill load)
WhatsApp: +86 18221755073
SAG mill design, GMD design and the associated component manufacturing. This paper also addresses, where applicable, the potential reliability differences between the initially proposed 40 ft SAG mill and the finally accepted 42 ft SAG mill. KEYWORDS SAG mill, 40 ft, 42 ft, gearless mill drive, GMD, SAG manufacture, reliability THE PROJECT
WhatsApp: +86 18221755073
Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that 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, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).
WhatsApp: +86 18221755073
The ROM SAG mill circuit—a brief description The typical ROM SAG mill circuit is depicted in Figure 1. The circuit is usually closed with either a screen or, more commonly, a cyclone for product size classification. The focus of control can be divided into two parts, viz. the mill and the cyclone. The importance of cyclone performance should ...
WhatsApp: +86 18221755073
PDF | On Sep 25, 2011, Ben Burger and others published Yanacocha Gold Single Stage SAG Mill Design, Operation and Optimisation | Find, read and cite all the research you need on ResearchGate
WhatsApp: +86 18221755073
And the product of the large AG/SAG grinding is either a finished size ready of processing, or an immediate size for further grinding in a ball mill, pebble mill, VERTIMILL® or a stirred media detritor (SMD). Grinding circuit design AG/SAG mills are normally used to grind run-offmine ore or primary crusher product. Feed size to the mill is ...
WhatsApp: +86 18221755073
— SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice. Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e., the impact …
WhatsApp: +86 18221755073
— The designs of autogenous and semi-autogenous (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 …
WhatsApp: +86 18221755073
Selection and Design of Mill Liners. In Advances in Comminution, Ed. S.K. Kawatra. ISBN-13: 978-0-87335-246-8, Society for Mining, metallurgy, and exploration, Inc., Colorado, USA. pp. 331-376. ... Mines (WA) 36ft SAG mill the number of Outer Head Liners was reduced from 36 to 18 pieces and in
WhatsApp: +86 18221755073
20MW). Selection of SAG mill dimensions and operating parameters is a complex problem and suffice it to say here that it is advisable in the design to provide operating flexibility to increase power demand. Design parameters chosen for the Cadia SAG mill are shown the following table. Table 2 : Cadia SAG Mill Design Parameters
WhatsApp: +86 18221755073
911metallurgist-SAG Mill Liner Design - Free download as PDF File (.pdf), Text File (.txt) or read online for free. SAG mill liner design and configuration can significantly impact mill performance. Key considerations for liner design include lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity.
WhatsApp: +86 18221755073
The 32ft SAG mill has a design maximum throughput of 1500tph, operating with the coarsest transfer size of 2mm, at a mill discharge percent solids of 75%. The mill discharge is classified on a single deck linear vibrating screen, giving a maximum pebble recycle of 25% on Sulphide ore.
WhatsApp: +86 18221755073
This paper presents the structure of the latest version of the JKTech autogenous and semi-autogenous (AG/SAG) mill specific energy model, which is an adaptation of that …
WhatsApp: +86 18221755073
or some other design point, based on what is achievable to feed the SAG mill considering the mining method. Mine design is an important part of SAG mill design. 80 th Percentile Design: Recommended design point for most new plants. Typically the SAG mill will be 10 to 15% larger (more power) than an average ore design. Other design points
WhatsApp: +86 18221755073
SAG Mill Trommel Screens The SAG mill trommel screen provides a simple mechanism to classify large volumes of mill product. Many designers and mill operators believe that the benefits of simplicity and the ability to handle throughputs in excess of 5 000 tph of solids make trommels the preferred equipment for this application.
WhatsApp: +86 18221755073
INTRODUCTION. The purpose of this paper is to highlight and encourage the use of a recently developed and recommended approach to designing SAG mill grinding circuits …
WhatsApp: +86 18221755073
— The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft components on mill performance remains ...
WhatsApp: +86 18221755073
911metallurgist-SAG Mill Grinding Circuit Design - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document discusses SAG mill grinding circuit design. Some key points: 1) Adding …
WhatsApp: +86 18221755073
We would like to show you a description here but the site won't allow us.
WhatsApp: +86 18221755073
— A SAG (Semi-Autogenous Grinding) mill is a giant rotating cylinder filled with grinding media and the ore being reduced. As the mill rotates, the grinding media lifts and the impact crushes the feed material. SAG mill control refers to the practice of managing the mill load, which is the amount of material inside the mill at any given time.
WhatsApp: +86 18221755073
TABLE 1 Comparison of RoM and SAG mill operating regimes Speed, % critical Charge Filling, % total mill volume Bali filling, % total mill volume Internallength Aspect ratio, diameter/length Recycle stream Application AG/SAG 70- 80% 20 - 30% 4-15% 3-5m 0.7 -2 Trommel oversize & J)ebble crusher Primary grind South African RoM 75 -90% 35 - …
WhatsApp: +86 18221755073