USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE ... the HPGR is in open circuit, K 3 takes the value of 1.19. x 1 ... If a ball mill circuit were to be fed 2 distributions, each with same P80 but with the open and closed circuit gradients in Figure 1, the closed circuit …
Unlike for ball mill circuits, less research has been conducted on the effect of closed circuit on HPGR performance. There is no specific work published in regard to the effect of classification efficiency on HPGR circuit capacity.
HPGR may not be the right machine for less competent ore, especially when the ore has clays. So far it looks like that there are certain ore types that require too much energy to have them ground down in a conventional SAG-Ball Mill circuit.
Summary: In this paper, the performance of a closed circuit HPGR operation was evaluated by the data obtained from six measurements in a cement grinding circuit operating in Turkey. Flowrates of the streams and classifier performance were evaluated after mass balancing. The average specific energy consumption of the HPGR for six measurements was 9.62 kWh/t for grinding from 17.9 mm to 57 µm ...
grinding rolls (HPGR) and high speed stirred mill, have been developed and adopted in the hardrock mining operation focused on the energy and cost comparisons of the existing AG/SAG ball mill circuits with two proposed comminution circuits, including an HPGR ball mill circuit and a novel HPGR stirred mill circuit. Article (PDF)
the ball mill grinding task. Requiring less process stages, an HPGR significantly reduces overall circuit energy consumption, grinding media consumption and wear cost. The Enduron ® HPGR featuring KHD* technology can be utilised in a wide variety of minerals and size reduction duties, from coarse crushing for heap leaching through to
Evaluation of dry grinding using HPGR in closed circuit with an air classifier. ... That is, the Option A circuit consumes 20.8% less energy per tonne of ore processed than the Option B circuit when the ball mill in the latter circuit is scaled up to a 2.44 ...
HPGR and ball mill circuit. This is a highly experimental model. Use at your own risk! The high pressure grinding roll (HPGR) and ball mill circuit can be thought of as a variation on the classical single stage ball mill (SSBM) circuit with the final stage of cone crushing replaced by an HPGR.
Weir Minerals Service to the mining mill circuit worldwide ... HPGR technology and service. Weir Minerals has formed a global alliance with KHD Humboldt Wedag to market KHD's High Pressure Grinding Roll (HPGR) product in the mining and minerals processing market worldwide and to act as exclusive recommended global service provider for
Product P80 of any intermediate HPGR circuit ahead of the tumbling mill stage(s) (µm) 8. Product P80 of the tumbling mill stage(s) (µm) •If there are multiple stages of grinding (e.g., SAG milling followed by ball milling), only the P80 of the product of the final milling stage is required.
Secondary crushing and partial HPGR of SAG mill feed improved power efficiency. However, three stage crushing with the last stage using HPGR followed by single stage ball milling is expected to result in a comminution circuit that uses between 95% and of Bond predicted power.
Energy efficient comminution circuits ... HRC™ – The evolution of HPGR technology HRC™ ... underflow fed to pebble mill circuit sump. AG mill can be replaceable for a SAG mill, however special care should be used to detect and remove balls from the HRC feed.
the specific energy of the crushing section, the HPGR section and the tumbling mill section separately. Hence, for example, in the case of an SABC circuit the total specific energy of the entire comminution circuit will be predicted plus the individual specific energies of the primary crusher, pebble crusher and combined SAG/Ball mill stages.
circuit design. Other hard-rock projects that have recently adopted HPGR include Freeport (Indonesia), Boddington (Australia) and Amplats Potgietersrus (South Africa). With the increasing acceptance of this technology, the need for technical presentations and articles exhorting the industry to adapt
Size HPGR with a 7 mm screen and an air classifier cutting for final product, showed a 46% energy reduction for the latter HPGR-only circuit (Van der Meer et al., 2012). Two HPGR flowsheet options were tested in the present study using commercial aggregate …
RAPID RAMP-UP OF THE TROPICANA HPGR CIRCUIT . ABSTRACT . The 5.5 Mtpa Tropicana Gold Project in Western Australia adopted a HPGR ball mill comminution circuit due to the high cost of power generation and to reduce its energy footprint in line with its environmental operating licence. In order to maximise the benefit from the HPGR, closed circuit
A proper model is an invaluable tool for circuit optimization. Depending on your needs, a variety of software can be used for steady-state or dynamic simulation of comminution circuits. Modeling and simulation also provide information to help select the best equipment and plant layouts during new circuit …
Predicting the Overall Specific Energy Requirements of AG/SAG, Ball Mill and HPGR Circuits on the Basis of Small-Scale Laboratory Ore Characterisation Tests. ... the HPGR-ball mill circuit ...
We have influenced a selection of many of the major HPGR and mill installations. Our team is experienced in installing crushers and HPGR's into existing SAG Mill/ball mill circuits both to balance the power split between the SAG Mill and ball mill and to increase the overall circuit tonnage and performance. Comminution:
in introducing HPGR at Cerro Verde mine in Peru, in 2006. The circuit at Cerro Verde incorporates four HPGR units (2.4 m diameter x 1.6 m wide, 5,000 kW, processing 2,500 t/h), instead of traditional SAG mill circuit. Freeport-McMoRan's Grasberg mine in Irian Jaya, Indonesia, uses two
them is the net circuit energy savings when 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
tailor feed size to circuit design? tailor circuit design to feed size? – limited by ability to predict feed size… limited focus during studies. Mine-to-Mill version 1.0 is only the first step – as a retrofit solution/opportunity to an existing, conventional circuit
Comparison of open and closed circuit HPGR application on dry grinding circuit performance Article (PDF Available) in Minerals Engineering 24(3):267-275 · February 2011 with 974 Reads
In a recent publication (SAG 2015), we presented a non-conventional HPGR-Ball mill circuit as a lower capital cost alternative to the "standard" HPGR circuit. The circuit was designed for the treatment of a hard ore and relatively high tonnage (50,000 t/d). That paper provided details such as flowsheets, layouts, and equipment lists for the ...
Rod Mill Secondary Crushing followed by a open or closed circuit Rod mill HPGR Peb Two stage conventional crushing with lump rock extraction followed by a HPGR and a Pebble mill Rock Characteristics Wear Characteristics Product Size Fine Coarse Fine Coarse Fine Coarse Fine Coarse Fine Coarse Circuit Capacity < 4 Mtpa
• two stage crush, ball mill, e.g. Pajingo. • a crushing circuit including high pressure grinding rolls (HPGR) at Argyle Diamond Mine. Recent feasibility studies for the Boddington Expansion Project have considered the use of HPGR for hard rock multi-stage crushing and ball mill circuits at high tonnage rates (Parker et al, 2001).
The HPGR product is passed firstly through a disagglomera-tor to break up the flakes and then the material is fed to a dynamic air classifier. The classifier fine stream is the feed for the ball mill-classifier circuit while the classifier coarse stream is returned to the HPGR. The design variables of the HPGR and
A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many processes.There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand (e.g., via a hand crank), working animal (e.g., horse mill), wind or water ().
There was a discrepancy in the additional power required to reduce the final product size from 160 to 75 μm for SABC circuit and HPGR-ball mill circuit. The HPGR-ball mill circuit when grinding to 75 um compared to 160 um used an extra 4.6 kWh/mt, but for the SABC circuit it …
HPGR or high-pressure grinding rolls have made broad advances into nonferrous metal mining. The technology is now widely viewed as a primary milling alternative, and there arc a number of large installations commissioned in recent years. After these developments, an HPGR based circuit configuration would often be the base case for certain ore types, such as very hard, abrasive ores.