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However, capital and operating cost savings could be expected for the conveying and screening. In this, operating a number of HPGR in series (i.e. multi-pass operation) could increase the size reduction achieved over single-pass operation for the same cumulative specific energy input [Norgate & Weller 1994].
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2. Changes to design lead to HPGR and ball mill circuits, thus lowering the energy consumption costs slightly 3. Further examination, HPGR and stirred mills circuits demonstrated it is technically feasible and showed promising benefits over traditional options 1 …
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Abstract. In the past 20 years, the energy-efficient comminution technologies, including high pressure grinding rolls (HPGR) and high speed stirred mill, have been developed and adopted in the hard-rock mining operation in order to reduce the energy consumption and improve the process performance.
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provides capital and operating cost estimates for each of the comminution circuits . The results showed that the HPGR - ball mill circuit achieved a 21% reduction in energ y consumption over the existing SAG - ball mill circuit at the same P 80 grind size of 160 µm. At a grind of 80% passing 75 µm, the HPGR - stirred mill
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High-pressure grinding roll (HPGR)-based circuits are increasingly applied to replace the semi-autogenous grinding (SAG) mill circuits due to their higher energy efficiency and lower operating cost. A novel HPGR circuit is proposed to replace conventional ball mills and extend the energy benefits for final grinding before the flotation or leaching circuit.
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The HPGR-ball mill circuit was estimated to require 75% of the energy of a standard semi-autogenous grinding (SAG) mill circuit. Even with an anticipated greater capital cost, the HPGR-ball mill circuit was found to give significantly better financial returns in all cases investigated in the feasibility study.
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costs) of ancillary systems are often not captured when doing the comparisons. The more complicated nature of the multistage crushing plants means there are more ancillary systems than a SAG mill plant, risking a skewed analysis of the operating costs, benefiting the HPGR option.
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11% additional gold leach extraction due to the HPGR micro-fracturing effect, together with gains from increased amounts of fines in an HPGR prepared feed of the same topsize. The HPGR pressing force has been found to be a sensitive operational variable with respect to leach extraction and operational costs.
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In case of the HPGR the optimum point of operation is widely influenced by ore properties like feed size, hardness and the rate of feed. Energy cost and water savings, smaller plant footprint and extended availability are some of the main reasons why we see more and more HPGRs within crushing and grinding circuits.
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Outotec's HRC with flanges has been proven to enhance HPGR circuit operation with overall finer product size gradation and the resulting reduction of circulating loads and energy consumption. The flanges enhance the draw-in of material into the roll gap, resulting in a wider operating gap, reducing specific energy consumption and allowing for a larger top …
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HPGR technology • More than 400 installations worldwide 2 polycom® high-pressure grinding roll 3. ... with the ultra-energy-efficient velix ® stirred media mill will lower your operating costs. New mines are increasingly being located or existing ones ex- tended in areas of the world where water is in short supply.
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Lower costs through approx. 15% energy savings, less wear and tear, ... you can continually improve your HPGR Pro's operation and optimize throughput, energy consumption or machine availability in line with ... the uniform pressure profile in the milling gap results in better grinding and more even roller wear.
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CSP's HPGR Rolls are uniquely designed and built for maximum performance and durability. They reduce plant operating cost per ton and cost per hour. Longer service cycles leads to significantly reduced maintenance costs and our unique HPGR Rolls design enables them to be withdrawn efficiently and replaced when wore down.
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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 operation with wet screening at 4 mm was selected.
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operational costs of the HPGR circuit offset its higher capital costs (Seidel et al, 2006). Furthermore, after ... • Plenty of surge capacity is provided between the ball mill and the HPGR to sustain constant feed to the ball mills while maintaining the …
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FIRST YEAR OF OPERATION OF HPGR AT TROPICANA GOLD MINE – CASE STUDY *Andrew Gardula 1, Dilip Das 1 ... • Lower consumables cost – HPGR wear linings offer long service life and low maintenance cost . ... o Screen oversize recycled to HPGR • Ball Mill product reports to CIL process .
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Apr 01, 2017· The non-conventional HPGR-based circuit brings the capital cost to the level of the traditional SAG-Ball mill circuits. •. The innovative HPGR circuit provides similar operational cost savings of the "standard" HPGR and promote the utilization of a technology that enables higher energy efficiency and reduced greenhouse gas ...
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FIRST YEAR OF OPERATION OF HPGR AT TROPICANA GOLD MINE – CASE STUDY *Andrew Gardula 1, Dilip Das 1 ... • Lower consumables cost – HPGR wear linings offer long service life and low maintenance cost . ... o Screen oversize recycled to HPGR • Ball Mill product reports to CIL process .
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COMPARISON OF HPGR - BALL MILL AND HPGR - STIRRED MILL CIRCUITS TO THE EXISTING AG/SAG MILL - BALL MILL CIRCUITS by Chengtie Wang B.Eng., University of Science and Technology Beijing, 2009 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF ... 6.3 Capital and operating cost ...
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