Mar 17 2016 · Question what is an Autogenous mill An autogenous AG mill is a grinding mill used in the minerals processing industry It is shaped like a huge drum on its side and spins rapidly to carry ore to the top using centrifugal force Gravity assist

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 described

ABSTRACT Since the days of mandatory high cost pilot plant testing in 6 ft × 2 ft SAG mills autogenous grinding semi autogenous grinding AG SAG mill specific energy is now calculated by various empirical formulae and pilot testing carried out in small laboratory mills

SAG is an acronym for Semi Autogenous Grinding SAG mills are essentially autogenous mills but utilize grinding balls to aid in grinding like in a ball mill A SAG mill is generally used as a primary or first stage grinding solution Attrition between grinding balls and ore particles causes grinding

BALL MILLS AND GRINDING MEDIA Steel balls used in grinding medium are used in grinding of ore to fine dimensions in ball mills Mill balls are used in semi autogenous and ball mills Semi autogenous grinding is a type of grinding carried out with a small amount of ball charge and with the help of bigger parts crumbling the smaller parts of ore

autogenous grinding designates generically the action of rocks grinding upon themselves as occurring in tumbling mills For reasons that will be further ad dressed in this work grinding in autogenous AG mills is frequently assisted by steel balls in which case it is called semi autogenous SAG grinding

Semi Autogenous Mill Description of Semi Autogenous Mill This semi autogenous mill also called semi autogenous grinding mill or SAG mill is mainly used to grind ores and other particulate matter in different fields like chemical industry mining field metallurgy industry building material sector and so

Autogenous grinding AG and semi autogenous grinding SAG mills use the material to be ground as the grinding media Autogenous grinding mills use larger rocks to impact and break smaller rocks as the mill rotates Semi autogenous mills are basically the same autogenous mills but with the addition of balls similar to those in ball mills

SAG mill ball charge determination and its influence on mill drive requirements Abstract In semi autogenous grinding SAG the grinding mill inventory i e volume of total charge volume of ball charge etc is important in determining the optimum operating condition for maximum production tph minimum specific energy kwh t or lowest

Mill Sizing After laboratory and pilot plant testing confirm the feasibility of autogenous or semi autogenous grinding it can be used to establish the exact grinding circuit and mill size In the pilot plant tests the tare power of the pilot plant mills should be determined before and after each test run The tare power should be for the empty mill

Semi autogenous mills and ball millsHenan Mining Autogenous SemiAutogenous Grinding Circuits Autogenous Grinding Circuits When an ore is hard and competent there is always the possibility that it would make good pebbles which could be used for fine grinding media Different methods that have been tried using combinations of autogenous

2 1 SAG mill modeling In MODSIM one of the simulation models used for a SAG mill unit is SAGT Semi Autogenous Grinding with Trommel model In this model a SAG mill with a trommel screen at mill discharge is modeled using the full population balance

A non linear observer model of a semi autogenous grinding mill is developed The observer model distinguishes between the volumetric hold up of water solids and the grinding media in the mill Solids refer to all ore small enough to discharge through the end discharge grate and grinding media refers to the rocks and steel balls

A Method of C alculating Autogenous Semi Autogenous Grinding Mill Specifi c Energies Using a Combination of Bond Work Indices and Julius Kruttschnitt Parameters then Applying Effi ciency Factors D Burgess1 ABSTRACT Since the days of mandatory high cost pilot plant testing in 6 ft × 2 ft SAG mills autogenous

Bassarear and Sorstokke of Cyprus Pima reviewed the test work they performed to develop their semi autogenous ball mill grinding circuit Many other papers on autogenous and semi autogenous grinding also discuss the pilot plant and bench scale testing done to prove grinding circuits

a large effect on profitability Mill operators have long used operating work indices to evaluate grinding circuit efficiency with great utility Operating work indices can be used to evaluate individual units in a conventional circuit or the overall performance of an autogenous semiautogenous AG SAG ball mill circuit but they are of

Durable Dry Type Mining Ball Mill 900x1800 Semi Autogenous Grinding Mill Semi autogenous mill introduction The autogenous grinding technology was divided into autogenous and semi autogenous according to add the steel ball whether or not in the mill Do not add steel ball is autogenous

Single stage semi autogenous autogenous S AG milling has become a common design for a variety of ore types with the advantages of being comparatively low capital cost and flexible for future expansion The single stage SAG AG milling option is ideal for starter projects with significant exploration and expansion potential Currently a

Nowadays experimental semi autogenous SAG mill and drop weight test are used for evaluation of grinding circuit regarding changes in feed particle size distribution size of the ball speed of

High efficiency autogenous mill can realize the second and third stage crushing and screening and part or all crushing and grinding of rod mill or ball mill Low power consumption no dust pollution less auxiliary equipment easy production automation and stable particle size

to predict semi autogenous mill power The feed moisture mass flowrate mill load cell weight SAG mill solid percent inlet and outlet water to the SAG mill and work index selected as input variables and evaluated the effect of them on the mill power The results showed that the trained hybrid model of

The Autogenous Semi autogenous Grinding Mills are in most cases used as primary crushers AG Crushers use the ore exclusively as their grinding media In case the hardness and the abrasiveness of the Ore is not suitable enough to carry out the grinding process steel balls are added in order to assist the process these are called SAG Crusher

Autogenous and semi autogenous mills are typically operated at slightly higher speeds than ball mills of the same diameter These purpose of a grinding circuit is to reduce the size of feed material to a size sultable for either a final product or for further processing

A non linear observer model of a semi autogenous grinding mill is developed The observer model distin guishes between the volumetric hold up of water solids and the grinding media in the mill Solids refer to all ore small enough to discharge through the end discharge grate and grinding media refers to the rocks and steel balls

In this case Xinhai efficient autogenous mill solved these problems effectively Xinhai efficient autogenous mill can achieve two and three stage crushing part or all crushing of ball mill and rod mill it is suitable for the coarse grinding after coarse crushing

Every mining operation has a unique grinding process Variable needs require versatile grinding equipment offers flexible autogenous AG mills semi autogenous SAG mills ball and pebble mills as well as stirred mills to fit your needs