In primary-secondary HPGR circuits, the secondary circuit can be closed with a screen to provide a consistent top size and gradation for optimizing HPGR performance. Closed circuited secondary crushing can also bring benefits if cones are used in tertiary crushing, too. However,
The primary crushing circuit remains a separate entity, with the coarse ore stockpile acting as abuffer between the gyratory crusher and the secondary crusher and HPGR. The secondary crushing circuit operates in closed circuit with screens to ensure a maximum top size of approximately 50 mm to each 2.4 m D HPGR.
Two stage HPGR installed after the secondary crusher Lower operating cost Efficient in producing the required feed size (two stages required) ... Normally HPGR is located after the primary/secondary crushing Can replace tertiary crushing with SAG mill, where a ball mill is still required
The secondary crushing stage comprises 2 x FLSmidth XL900Raptor cone crushers (duty/standby) which operate in closed circuit with the secondary screens. The secondary crushed product reports to the HPGR feed bin, which has 18 minutes live capacity.
Primary crushing open circuit and stock pile Secondary crushing circuit closed with 42 mm screen o Screen underflow reports to HPGR o Screen oversize recycled to cone crushers for re-crush HPGR circuit closed with 4 mm screens o Screen underflow reports to Ball Mill o Screen oversize recycled to HPGR
a result of HPGR. Baum (1997) used dye-impregnation to demonstrate micro-fractures in HPGR product particles. (Fig.4). Patzelt et al (1996) showed column leach test results indicating that the heap leach improvement benefits of HPGR over conventional crushing is greatest for the coarser particle size ranges probably due to the
The HPGR-ball mill circuit comprises a reverse-closed secondary crushing circuit prior to a closed HPGR circuit, followed by a reversed-closed ball-mill circuit with cyclones (See Figure 2). The vibrating screen decks were set to an aperture size of 32 and 4 mm for the secondary crushing stage
Feb 24, 2015 In Option 3, secondary crushing and HPGR effectively replace AG milling with pebble crushing. The application of HPGR, stirred milling and an additional magnetic separation stage reduces the power requirements compared to Options 1 and 2.
Jan 01, 2016 The most common HPGR-based circuit involves feeding primary crusher product to a secondary crushing circuit with of cone crushers in closed circuit with screens, followed by tertiary crushing with HPGRs, also operating in closed circuit with screens. The product of these two stages of crushing and screening then passes to secondary milling.
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