[]### Energy savings in comminution Innovative routes for

energy consumption implies both high operationalcost and greenhouse footprint. Thus, comminution accounts for 30 to 70 % of the power draw of a typical mineral processing plant and for 20 to 50 % of the capital costs. However, the comminution process is only 1% efficient in terms of the energy required to generate new surfaces (cf. Whittles et

Get Price[]### SINGLE PARTICLE IMPACT BREAKAGE CHARACTERIZATION OF

Ecs Specific comminution energy in kWh/t mp Mean particle mass in g. Single particle breakage tests were conducted on each set of sample at the required energy levels and the broken fragments were collected from each set of particles, and dry sieved on a root 2 sieve series on a ro-tap sieve shaker for 15 minutes. Finally,

Get PricePrevious investigations have shown that the specific energy input is the overall parameter of influence on product size during communition in agitated ball mills, from laboratory up to industrial scale. The specific energy input is the introduced energy related to the amount of comminuted material. This parameter can be used for mill scale‐up.

Get Price[]### Dipl.-Ing. Th. Fahrland, Dr.-Ing. K.-H. Zysk, Loesche

Ball mill system Loesche Power consumption [kWh/t] VRM system 20 40 60 80 100 120 140 160 Fineness acc. to Blaine [cm2/g] 3 000 4 000 5 000 6 000 Figure 2 Specific power consumption of ball mill system v/s vertical roller mill system for slag grinding Fundamentally, ball mills use proportionately more energy

Get Price[]### Comparing ball and vertical mills performance An

seen, the vertical mill consistently presented lower net specific energy consumption than the ball mills which operate on the same circuit. The averages were 11.3, 11.7 and 6.5 kWh/t respectively for ball mill 01, ball mill 02 and vertical mill. Figure 5 Net specific energy consumption of regrinding circuit.

Get Pricespecific comminution energy of ball mills 2012 pdf Offer any size-reduction requirements including quarry, aggregate, and different kinds of minerals. 【Live Chat】 grinding mill ball consumption calculation. Calculation of energy required for grinding in a ball mill, modeling the specific grinding energy and, modelling the specific

Get PriceComminution Testing Free download as File (.pdf), Text File (.txt) or read online for free. Comminution. rod and ball mills. M i h is the work index for the grinding in High Pressure Grinding Rolls (HPGR) and M i c for size reduction in conventional The influence of particle size on the specific comminution energy needed to achieve.

Get Price[]### Identification of Optimal Mill Operating Parameters during

specific net mill power, the following Eqns. (4)(8) can be used to determine the specific rate of breakage S i (1/min), for each size class i obtained after grinding, as a function of J. Bond F.C. (1960) proposed the following relationship for wet grinding in overflow ball mills to scale-up results from laboratory tests to larger mills

Get Price[]### Electric motors monitoring An alternative to increase the

efficiency of ball mills . Keywords . Monitoring, electric motor, ball mill, efficiency. 1. Introduction . Mineral mills are machines used in those production processes which require the comminution of a certain material. The characteristics and operating principles of these mills can be very different, depending on the specific

Get PriceJun 20, 2018 · Machine scale, from 1 MW ball mills to 28 MW SAG mills; Linking mine blast performance to plant comminution performance; Development of high compression crushing (VRMs and HPGRs) Improved scale (not efficiency) of classifiers. Energy efficiency links breakage and classification. CEEC is a non-profit organisation focussed on communicating

Get PriceJun 20, 2018 · Machine scale, from 1 MW ball mills to 28 MW SAG mills; Linking mine blast performance to plant comminution performance; Development of high compression crushing (VRMs and HPGRs) Improved scale (not efficiency) of classifiers. Energy efficiency links breakage and classification. CEEC is a non-profit organisation focussed on communicating

Get PriceAug 20, 2015 · Work of Ball mill At low speed attrition force At higher speed impact force At sufficient speed centrifug force C 44. Factor affecting milling process 1. size of ball 2. Charge of balls in mills 3. Amount of material to be mille 4. Weight of balls 5. Wet an dry milling 6. Viscosity 7. Wetting agent 45. Ball mill 46.

Get Price[]### Evolution of a generic, dynamic and multicomponent

Comminution, including crushing and grinding, consumes a considerable amount of energy in the mining industry. Ballantyne and Powell [3] estimated that about 0.2% of global, and 1.3% of Australia's electricity is consumed by comminution of gold and copper ores alone. Ball mills and SAG/AG mills are the most

Get Price[]### Comminution '08

Comminution '08 Falmouth, UK, June 17-20, 2008 replacing ball mills Media wear Weber showed that there is a minimum in the correlation between specific grinding energy and stress intensity. The stress intensity is given by, where v T is the peripheral (or maximum) particle velocity. This can be used

Get PriceDec 18, 2013 · where W is the specific grinding energy (kWh/t), W i is the Bond ball mill work index (kWh/t), F80 is the feed 80 pct passing size (μm), and P80 is the product 80 pct passing size (μm). It can be seen that in the regime in which the Bond equation is valid, energy use increases exponentially as product size decreases with constant feed size

Get Price[]### L.

of the wide variation in kinds of comminution events in the ball mill and because of possible untouched feed, the ball mill product follows equation (2a) only in the finer sizes, with large deviations in the coarser sizes. In terms of the kinetics of particle formation in a ball mill. one

Get Price[]### European Cement Research European Cement Research

3.6 Electrical energy demand 14 3.7 Inter-grinding and separate grinding 17 4 Industrial grinding technology 19 4.1 Efficiency of comminution processes 19 4.2 Comminution in other industries 20 4.3 ECRA database on comminution technology 20 4.3.1 Ball Mill 23 4.3.2 Vertical Roller Mill

Get Price[]### Influence of an Organic Polymer in Ball-Mill Grinding of

tion of comminution processes and de veloped procedures for using the popula tion balance grinding model in the scale up design of ball mills. In the first phase of this study, relationships be tween the parameters of the grinding model and specific power input to the mill were identified, and a specific-

Get PriceIn conjunction with the Bond ball mill work index, they can be used to accurately predict the overall specific energy requirements of circuits containing AG and SAG mills, ball mills, rod mills, crushers, and high pressure grinding rolls (HPGRs). SMC Testing says. The comminution circuit throughput also increased annual gold production by

Get Price[]### Grinding Circuit at Mouteh Gold Mine AUT Journal of

province and a ball mill is in its grinding circuit. The main problem is high energy utilization in the ball mill. An optimization study therefore has been carried out in this circuit. To determine grinding circuit performance, Bond efficiency factorwas selected. The survey results were then analyzed and the bugs of the circuit were determined. 2.

Get Price[]### Orway Mineral Consultants Canada Ltd. Mississauga, ON

BM = Ball mill specific energy from T 80 1.7 mm to final product P 80, using Bond's Law, (kWh/t) W T = Total grinding mill circuit specific energy (kWh/t) Note that K BM is the composite of EF3, EF4 and EF5 factors for ball milling (Rowland, 1982). Morrell and SMCC Morrell (2004) developed a methodology for predicting specific energy with

Get Price[]### Orway Mineral Consultants Canada Ltd. Mississauga, ON

BM = Ball mill specific energy from T 80 1.7 mm to final product P 80, using Bond's Law, (kWh/t) W T = Total grinding mill circuit specific energy (kWh/t) Note that K BM is the composite of EF3, EF4 and EF5 factors for ball milling (Rowland, 1982). Morrell and SMCC Morrell (2004) developed a methodology for predicting specific energy with

Get Price[]### Molecular dynamics of comminution in ball mills

V. Buchholtz et al. Molecular dynamics of comminution in ball mills 171 F 4 F F F n n n n 2 1 3 Fig. 1. A typical situation of one particle being compressed by four impacting particles. The forces are considered as inde-

Get Price[]### Optimization of mill performance by using

Optimization of mill performance by using online ball and pulp measurements by B. Clermont* and B. de Haas* Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator. Comminution is responsible for 50% of the total mineral processing cost. In today's global markets, expanding mining groups are trying

Get PriceThe software is coupled with proven best practices comminution sciences. 3. Recommendations and Redesign We will provide a redesign of the mill lining system (AG/SAG, Ball Mills) along with material specific recommendations. We will also design and supply new hyper lifter and mill liner as well as providing performance tests. 4.

Get Price[]### C O N S U L T I N G L T D TECHNICAL MEMORANDUM

Figure 2 Ball mill for determining Bond ball mill work index 1 For the purists, there were two models in existence at the time the Von Rittinger and Kick models. Neither of these gave results that matched the observations of specific energy consumption from tumbling mills. 2 F.C. Bond; The Third Theory Of Comminution, Transactions AIME 1952

Get Pricecomminution circuit providing high throughputs can be seen in 3. This cir-cuit, however, has a high specific energy consumption per ton of ore processed, driven primarily by the low efficiency of the ball mills and the need to use steel media for grinding. Ring-geared mill drive Throughout the comminution process,

Get Price[]### by P. Somasundaran and D. W. Fuerstenau

limestone in laboratory ball and rod mills. From these experiments, the amount of energy consumed in grinding each component of the mixture was deter-mined. In the ball mill, limestone consumes slightly lI¥>re energy than quartz in the initial stages of grind-ing, but as the grinding proceeds quartz begins to

Get PriceThe specific kinetic energy (J/kg) used in the comminution test is described by2 2 1 2 2 kin m E v m v = ⋅ = ⋅(9)where v is impact velocity in m/s and m is the sample mass. Equation (9) shows that the specific breakage energy is independent of the sample mass, which is a unique characteristic of the rotary breakage test.

Get Price[]### EXPLORING THE EFFECT OF ENERGY RECOVERY POTENTIAL

given mill on comminution efficiency. Specifically, using, mill and comminution circuit temperature data specific heats of the ore and water [kJ/kg-K], T 2, T 1 the average portion of energy input into ball mill grinding lost to the environment which in this case is 30% or 681 kW. Using mill make-up water (16C) as the cold source and

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