by HPGR within a pregrinding application in front of a primary ball mill Morely 1995 The HPGR is designed to work in open circuit in this case with the transfer size to the ball mill being in the range of 80 % passing 7 mm The primary ball mill is operated in a closed circuit with a screw classifier followed by a magnetic separation stage
Three circuits were examined for this energy comparison study a cone crusher / ball mill circuit an HPGR / ball mill circuit and the novel HPGR / stirred mill circuit The feed size to each circuit was fixed at an f80 of 21 mm and a product p80 of 75 µm was chosen as a suitable feed size for flotation The
use of HPGR for hard rock multi stage 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
Results from this research showed that operating the first stage HPGR in open circuit and the second stage in closed circuit with a 710µm screen resulted in a circuit energy requirement of /t a reduction of and % over the HPGR / ball mill and cone crusher / ball mill circuits respectively
specific energy consumption in HPGR circuits Doll1 1Consultant PO Box 1236 Logan Lake Canada V0K 1W0 Corresponding author ABSTRACT Multi stage crushing plants including high pressure grinding roll HPGR circuits require more materials handling equipment than SAG and ball
One additional screen was installed in 2010 and in 2011 a sixth secondary crusher was installed Secondary crushing is a closed circuit and the screen undersize is sent to the HPGR circuit The four m x m HPGRs operate in closed circuit with eight m x m wet screens The wet screen undersize feeds the grinding circuit ball
A two stage HPGR horizontal stirred mill circuit has been proposed and its specific energy requirement was determined by a series of stirred mill tests adopting a pilot scale HPGR and JKSimMet® model it was shown that this circuit consumed 13 % 31 % less energy than SAB/AGBC/SABC circuits for Cu porphyry ore Wang 2013 and consumed
This paper unifies high pressure grinding rolls crusher HPGR models of the working gap mass flow rate power draw and centre and edge product particle size distribution models to produce a framework that allows the simulation of the equipment for process optimization and control studies improving the process control of an HPGR circuit
Trade Off Realities in HPGR vs SAG Milling—A Practical Comparison of Tropicana and Gruyere Comminution Circuits Lovatt M Becker and B Putland1 R Radford2 J Robinson3 Orway Mineral Consultants Level 5 1 Adelaide Terrace East Perth Western Australia 6004 Gold Fields Level 4
hard rock mining operation in order to reduce the energy consumption and improve the process performance The combination of HPGR and stirred mill in a single flowsheet without tumbling mills has been demonstrated to be technically feasible Figure JK SimMet® screenshot of the HPGR circuit simulation for case A
The design criteria and rationale for selection of the new circuit was presented in a paper titled Cadia Expansion From Open Pit to Block Cave and beyond Engelhardt Lane and Powell 2011
This circuit includes an HPGR crusher closed with screens A time dynamic model of the crusher and the circuit has been built The tertiary circuit have thereafter been calibrated and validated in
HPGR technology provides the greatest benefits for hard and very hard ores for ores which are softer AG or SAG milling can be the more economical solution due to the simplicity of the circuit not requiring secondary crushing screening and material handling to these individual processing steps
Traditionally the generated pebbles are re crushed via cone crushers however the hard and abrasive nature of these pebbles result into significant liner wear and frequent cone crusher downtime Integrating a HPGR into the pebble re grinding circuit can alleviate the wear component and provide an improved overall feed to the S AG mill
In addition HPGRs have been installed or retrofitted respectively in semi autogenous ball mill crusher SABC circuits and were additionally installed in conventional crushing and grinding plants to improve production All these installations contributed to a broad knowledge base for current and future applications
One of the major drivers for using HPGR in hard rock operations is that HPGR are found to have better energy efficiency and savings in grinding media than the circuits based on autogenous mills AG or semiautogenous mills that have been prevalent over the past four decades Rosario et al 2009
"The number of High Pressure Grinding Rolls HPGRs also called Roller Press installations instead of tertiary crushers is rapidly increasing The technology has been largely accepted in the minerals industry and benefits such as superior energy efficiency and a lower overall operating cost compared to alternative technologies have been demonstrated at a
Results from this research showed that operating the first stage HPGR in open circuit and the second stage in closed circuit with a 710µm screen resulted in a circuit energy requirement of /t a reduction of and % over the HPGR / ball mill and cone crusher / ball mill circuits respectively
• Investigates the feasibility of a novel AG Crusher HPGR circuit using rock samples from a large copper gold mining project The approach was to develop and evaluate the circuit design for high tonnage operations with mixed hardness ores containing clay are starting to replace SAG circuits in hard rock mining • Presents a structured
sooner than by 2010 HPGR was the first time put in operation in hard rock crushing circuit at Penasquito project in Mexico Fig 4 HPGR Polycom 24/17 is entered in close circuited grinding of SAG mill discharge which enables open circuit SAG milling Fig 1 Number of HPGR in service in various mineral processing by years
comparing complete SAG circuits to complete HPGR circuits since extra equipment is required when using the HPGR A structured approach to the evaluation of the energy requirements of HPGR and SAG mill circuits in hard ore applications by P Rosario † and R Hall† Synopsis The application of high pressure grinding rolls HPGR has been
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