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sag mill feed size

Mill To Achieve Design Performance John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, SAG mill is an investment that can produce handsome returns if extra production is needed or Where x = the load in the mill expressed as measured % by volume and y = kg/h of feed.

Feed size effects what size is important? historically, MinetoMill has – focussed on blasting alone – generation of more fines • pass through SAG mill onto ball mill circuits • higher throughput (e.g. 10% to 30%) • coarser grind size (possibly) fine <25mm medium 25 75mm coarse >75mm

The SAG grindability index test. reference circuit consisting of a SAG mill operating in closed circuit without pebble crushing and with nominal 6 in. SAG mill feed (Kosick and Bennett, as long as they are already finer than the SAG mill classifier slots and the SAG mill throughput is limited by the size reduction of the coarse, plus

100 90 80 Cum % Passing 70 60 50 40 30 20 10 0 0.01 0.1 1 100 5660 kW at 503 tph 80 SAG feed SAG discharge Percentage Passing 60 Rod Mill Disch SAG Mill Discharge

TAKING CONTROL OF THE MILL FEED: CASE STUDY PARTIAL SECONDARY CRUSHING MT RAWDON Brian Putland, Bernie Siddall and Andrew Gunstone MET PLANT 2004 CONFERENCE 6 7 September 2004 Perth, WA the benefits of SAG mill feed size manipulation can be readily assessed. Furthermore the paper

Feed Chute Transporter was specially designed to Service SAG Mill Feed Chut The feed end of the 13000 hp Fort Knox SAG, aspect AG and SAG mills to suit any appliion across the full size and power, For primary mills, a feed chute incorporating .

SAG Mill Grinding Circuit Design. SAG Mill Grinding Circuit Design. Criticalsized particles are those where the product of the mill feedsize distribution the designed SAG mill size and

The feed size distribution together with the ore characteristics (hardness, lithology, alterations, etc.) are the most important factors affecting the SAG mills performance.

The feed size for these mills is limited to the maximum size that can be practically conveyed and introduced into the large mill feed chutes. 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, or a VERTIMILL® or a stirred media detritor (SMD).

The feed size distribution is also the implicit result of the ore competence (affecting blasting and crushing performance). This distribution affects the SAG mill load and the load affects directly the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill

100 90 80 Cum % Passing 70 60 50 40 30 20 10 0 0.01 0.1 1 100 5660 kW at 503 tph 80 SAG feed SAG discharge Percentage Passing 60 Rod Mill Disch SAG Mill Discharge

Two new SAG milling models are developed in this work, able to predict power or specific energy consumption, including the usual design variables such as mill size balls charge level, solids concentration in the SAG mill feed and % of critical speed, but adding a variable that represents the feed size

SAG mill energy required according to this statement, is 2.5 the rod mill feed is produced from an open circuit crusher the factor to be applied increases to 1.4. bond Fo, the optimum feed size calculation, and the highest 1 10 100 1 10 100 1000 10000 100000 Cum % Passing

The PTI study focussed on ball mill limited material from the Apensu open pit. Following a benchmarking study of all blasting, crushing and grinding practices in January 2009, PTI recommended changes in both blasting and crushing conditions in order to generate a finer feed size to the SAG mill.

The feed size for these mills is limited to the maximum size that can be practically conveyed and introduced into the large mill feed chutes. 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

Semi Autogenous Design Factors

paper illustrates some of the observed relationships between feed size and ag/sag mill response and provides examples of cases where feed size has been successfully manipulated.

Design SAG mill production when you need it most: is the proper allowance for reduced recovery that is caused by fluctuating tonnage when the SAG mill feed and to calculate the ball mill size required.

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