automatic control circuit ball mill sag

Table of Contents Autogenous Grinding CircuitsSAG vs Ball Mill AdvantagesAG SAG Mill Grinding Compared – Which is BestTesting for Product Size Size reduction is the most expensive operation in most mills Crushing and grinding usually require the greatest portion of capital costs and often make up 6070 percent of total mill operating costs as shown in Figure 1

That does not mean that the preference is speed control over feed rate control Each ore is different and each plant is different As equipment designers we have to provide each of the features that the operators could use to optimize their process In my experience SAG Mills are normally variable speed and Ball Mills are normally fixed speed

This would be achieved by connecting the expert system to the highest level of control ie provide the set points for the controllers Elber 1989 Over the last year or so further Help packages have been implemented These area HelpSAG Designer used by Morgardshammar a leading Swedish mill manufacturer for optimizing SAGBall Mill circuits

SAG mill power limits of 950 KW on the low end and 1175 KW at the high end Relative sound levels between 15 and 30 dB in order to minimize impact damage inside the SAG mill and avoid freewheeling overloading In order to optimize the impacting process within the SAG mill an internal mill

SAG milling extends itself to many applications due to the range of mill sizes available They can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work done by a ball mill SAG mills are also an optimum solution for wet grinding since crushing and screening in these

Advanced Controller for Grinding Mills Results from a Ball Mill Circuit in a Copper Concentrator Results of using this advanced controller on a ball mill circuit operation in a copper The first successfully implemented multivariable process control MPC is described for a SAG mill circuit in a bauxite processing refinery at Wagerup

Figure 1 Raglan Concentrator circuit after FAG to SAG ConversionOptimisation Project In addition to the new process equipment the SAG mill was commissioned with all controls implemented on the new PLC software platform This removed the control strategy limitations previously described Additional mill control loops and measurements now

AGSAG mills can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work of a ball mill Because of the range of mill sizes available AGSAG milling can often be accomplished with fewer lines than in a conventional rod millball mill circuit A diagram of types of AGSAG

MILLING CONTROL OPTIMISATION MillSTAR A global leader in mineral and metallurgical innovation Due to the complex nature of milling circuits it is often found that conventional control does not address many of the common Figures 8 and 9 on the right show results from a gold plant’s SAG mill achieved with MillStar’s Segregated Ore

The original Phu Kham grinding circuit comprised of a SAG and a ball mill in SAB flowsheet arrangement each with 13 MW of installed motor power The circuit targeted a cyclone overflow grind size of 106 um and an average flotation recovery of 85 In 2012 a second ball mill and additional flotation capacity were

feeders Each SAG mill is run in closed circuit with a gyratory pebble crusher Secondary and tertiary grinding is provided by ball mills on each module The objectives of SAG mill automation are to reduce the number of manual control actions required extend the life of mill internals and provide a steady feed to the down stream processes

Every mining operation has a unique grinding process Metso has experience of over 8000 grinding mills globally including manufacturing and delivering the largest SAGAG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup operation and optimization of your mill

MillSlicer has been developed for the minerals industry for AGSAG and ball mills Making use of vibration sensors and state of the art technology it provides information about the inlet and outlet conditions as well as what is happening 360° around the rotating mill USED FOR PROCESS CONTROL MILL SPEED CONTROL Automatic speed control

Model Predictive Control for SAG Milling in Minerals Processing 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure

A comprehensive automatic control system has been developed and implemented for the twostage grinding circuit at the Paddys Flat gold plant of Dominion Mining Ltd at Meekatharra in Western Australia The circuit comprises a SAG mill in closed circuit with a pebble crusher followed by a ball mill cyclone secondary circuit

Difference Between SAG Mill and Ball Mill from the working principle application structure etc Grind and blend solid or hard materials into smaller pieces by means of shear impact and compression

Keywords Ball mills grinding circuit process control I Introduction Grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical mechanical and chemical characteristics Typical examples are the various ores minerals limestone etc

The original Phu Kham grinding circuit comprised of a SAG and a ball mill in SAB flowsheet arrangement each with 13 MW of installed motor power The circuit targeted a cyclone overflow grind size of 106 um and an average flotation recovery of 85 In 2012 a second ball mill and additional flotation capacity were

use of HPGR for hard rock multistage crushing and ball mill circuits at high tonnage rates Parker et al 2001 Table 2 provides a simple comparison of the various comminution circuits The primary mill may be operated in open circuit or closed by a classifier such as a screen or a hydrocyclone

supported grinding mills up to the largest sizes SAGball mill circuit incorporating pebble crushers and a POLYCOM highpressure grinding roll SAG and ball mill for gold ore grinding One of three SAG mills with 975 m diameter and 2 x 4000 kW drive power These mills operate in conjunction with ball mills for iron ore grinding in Iran

Ball scats from a singlestage SAG mill and Crusher feed belt open pit operation An increase of over 10 in mill throughput was achieved by removing the ball scats from a singlestage SAG millA belt magnet is used to remove the steel which was previouslyThe magnetic scats removal belt was turned around so that the scats were ejected to the other side of the belt

Optimization of mill performance by using online ball and pulp measurements by B Clermont and B de Haas Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator Comminution is responsible for 50 of the total mineral processing cost In today’s global markets expanding mining groups are trying

A generic topdown control structure is proposed for the optimal steadystate operation of a grinding mill circuit The economic cost function of the grinding mill circuit is defined with reference to the final product of the larger mineral processing plant

SINGLE STAGE SAGAG MILLING DESIGN Brian Putland 1 Steps should be taken to control the variables and multiple runs of a test should be undertaken to even with a high ball charge or mill speed the circuit selection may be incorrect If a recycle crusher was not included it should be trialled If included the use of a

Aug 25 2004 · We have an application in a SAG Mill where we have installed an electronic ear in order to listen the noise produced by the balls falling to the bottom of the mill Our idea is to convert the amplitude and frequency of noise to a 420mA signal or something else in order to determine if the ball is crushing the mineral or the mill lining

ResearchGateBall mills RoM Ball mills like SAG mills utilise coarse rocks in the RoM feed as It is generally accepted that AGSAG mills are difficult to control due sag milling controlExpert mill control at AngloGold Ashanti SAIMMSAG semiautogenous milling circuit is described The typical ROM SAG mill circuit is depicted

The secondary milling circuit is designed to treat the total primary mill product through a single 23ft x 315ft grate discharge ball mill also fitted with dual 52MW drives The mill grinds the primary mill product to the required flotation feed size of 67 75µm and