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ore kwh t grinding mill

ORE GRINDING IN AN INDUSTRIAL DRUM MILL L Tzotzorkov 1, T P enchev 2, P Bodurov3 and L Kuzev4 ABSTRACT ... 8.5 kWh / t from maximum particle size 1 mm below 0.15 mm – 12.5 kWh / t from maximum particle size 1 mm below 0.1 mm - 23.5 kWh / t Defi ning the effi ciency of grinding is done by determining the differences of sieve characteristics

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  • Starkey amp Associates Inc. Leaders in Comminution Design

    Starkey amp Associates Inc. Leaders in Comminution Design

    The latter is now acknowledged by our clients to be a world-class method for grinding circuit design, and is accepted by our peers as a standard for ore hardness testing. SAGDesign testing provides SAG pinion energy grindability in kWh/t to within +/- 5% from 152 to 1.7 mm, and Bond Ball Mill Work Index on SAG ground ore, from the SAG test on ...

  • HIGmill energy efficient fine grinding Metso Outotec

    HIGmill energy efficient fine grinding Metso Outotec

    Apr 04, 2018 At the target grind size of 40 m, the required Specific Grinding Energy for flat discs is 22.7 kWh/t and for GrindForce rotors it is 16.3 kWh/t, a 28% energy saving. Recently Outotec has conducted rotor design optimisation work at the same site and achieved a further 5% decrease in energy use. Further R&D testwork was conducted to compare the ...

  • Optimising Western Australia Magnetite Circuit Design

    Optimising Western Australia Magnetite Circuit Design

    The Levin test for fine ball mill product predicts a net specific energy requirement of 52.5 kWh/t to grind from an F80 of ~400 m (AG mill/magnetic separator product) to a P80 of 34 m. An additional 2.3 kWh/t would be needed to reduce the plant feed P80 of 770 m to the test feed P80 of 420 m, giving a net energy requirement of 54.8 kWh/t.

  • Feed Size VS Ball Size Grinding amp Classification

    Feed Size VS Ball Size Grinding amp Classification

    For ball mill, Bond (1958) was proposing an empirical formula giving the top size of balls (make-up balls) DM function of the feed size xG (80% passing size - m), the ore true specific gravity sg, the ore Bond Work Index Wi (kWh/st), the fraction of critical speed fc and the inside mill diameter D (m):

  • Energy Use of Fine Grinding in Mineral Processing

    Energy Use of Fine Grinding in Mineral Processing

    Dec 18, 2013 Fine grinding, to P80 sizes as low as 7 μm, is becoming increasingly important as mines treat ores with smaller liberation sizes. This grinding is typically done using stirred mills such as the Isamill or Stirred Media Detritor. While fine grinding consumes less energy than primary grinding, it can still account for a substantial part of a mill’s energy budget. Overall energy use and media ...

  • SAG Mill Grinding Solutions Ltd

    SAG Mill Grinding Solutions Ltd

    Grinding Solutions offers the following tests for SAG mill testing and/or sizing. JKTech Drop Weight The JKTech Drop-Weight Test measures the breakage characteristics of an ore for five size fractions in the range of 13 to 63 mm, at various energy inputs (0.1 to 2.5 kWh/t). The ore-specific parameters derived from these measurements can be used in grinding circuit...

  • Application of Operating Work Indices in Autogenous

    Application of Operating Work Indices in Autogenous

    of an existing grinding circuit can be calculated, given known mill power draw, throughput, feed and product size distributions. kWh/t = Power applied per ton of feed to the grinding unit Wi = The standard Bond work index of the ore P 80 = The 80% cumulative passing size of the product in microns F 80 = The 80% cumulative passing size

  • Predicting the grinding energy of vrm depending on

    Predicting the grinding energy of vrm depending on

    Although the correlation is high, it is seen that the model predicts grinding energy higher in the range of 2 to 8 kWh/t and lower at high energy. It was determined …

  • Comparison of ore hardness measurements for grinding mill

    Comparison of ore hardness measurements for grinding mill

    Aug 19, 2009 A total of 9 kWh/t of grinding energy was indicated and this could be provided either in a single stage SAG mill to produce the P80 200 micron product, or a two stage circuit with equal power on the SAG and ball mills using the design Bond Wi of 11.5 kWh/t. A number of conclusions were drawn from this work. Some are presented here.

  • Bond Work Index an overview ScienceDirect Topics

    Bond Work Index an overview ScienceDirect Topics

    Bond impact crushability work index (CWi) (Bond, 1963) results reported for iron ores vary from hard iron ore (17.7 kWh/t) to medium hardness iron ore (11.3 kWh/t) and friable iron ore (6.3 kWh/t) (Table 2.11; Clout et al., 2007).

  • The implications of ore hardness variability on

    The implications of ore hardness variability on

    Usually grinding circuits are sized for a homogenous ore Constant A*b, SPI, Wi, etc., Usually evaluated for a fixed tonnage No variability is incorporated Problems: SAG mill circuits are directly coupled to ball mill circuits, so changing ore properties (feed size, hardness, etc.) lead to

  • Enduron 174 HPGR The Weir Group

    Enduron 174 HPGR The Weir Group

    Feb 02, 2021 In fact, the advantages of utilising high pressure grinding rolls in gold are steadily increasing, as gold miners are forced to turn to deeper and deeper ore bodies with higher competency. In my early experiences working with gold mines across Australia, the average Bond Work Index I encountered was probably 17 or 18 kWh/t but we’re now seeing numerous projects utilising ore with …

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