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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017



Yn725g Yineng Mini Front End LoaderCost modelling for flotation machines

S. Arfania; A.R.Feiyang New Hot Selling Trolley Speaker Fg210-06China Manufacturer Latest European Modern Furniture Genuine Leather Sofa; M.R. Khalesi

Tarbiat Modares University, Iran


Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater(SRA) and multiple regression analysis (MRA). Thirty-seven major flotation machines were analysed for this purpose. Depending on the machinery type, different technical variables such as diameter, required air flow rate, required floor space,PRO Audio PA System Digital Mixer, required air pressure, and power were considered as predictor variables, individually (in SRA) or simultaneously (in MRA). Principal component analysis (PCA) was used in MRA due to the high correlation between predictive variables. The performance of each model was evaluated using R2, MAER (mean absolute error rate), and residual analysis. In the case of MRA, the RMSE (root mean square error) test was also conducted. Maximum obtained MAER of 13.5% and minimum R2of 0.Food Grade L-Arginine with Best Price.

Keywords: cost estimation, flotation machine, regression model, principal component analysis.


J8 Dual 12'' Line Array PA Speaker Professional Stage Audio System, sizing, concentration, extractive metallurgical processes, and dewatering. Flotation is one of the most widely used methods for mineral concentration. Flotation can represent the second major cost item in mineral processing after grinding (Wills and Napier-Munn, 2011). Accordingly,10 " 12"15"18" PA Speakers Loudspeaker Cabinet/Enclosure. In any equipment selection, several interactions between engineering and economic considerations must be taken into account. Consequently, an accurate and easy cost model to select the most appropriate machinery is required. Moreover,Wild Bee Venom Extract Melittin 99% Powder for Skin Care.Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1(Khalesiet al.,2015).

Retinoic Acid CAS 302- 79 -4 in Stock.Plastic Clear White Stand-up Drinking Liquid Spout Food Packaging Baget al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Professional Speaker PRO Audio System Three-Way Large Line Array PA Mla8312/Mla8312da(Smith and Mason, 1997).ISO Certified 100% Natural L-Arginine Powder(Motorcycle Parts High Quality Cam ). One of the preliminary works was undertaken by Prasad (1969)High Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1, Khalesi, and Khosfarman (2014).Chemical Reagent Bloom Tech 2; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Quality Opa O-Phthalaldehyde with Best Price, the role of other effective parameters has simply been overlooked.Wholesale Factory Price High Quality Retinol Palmitate/Vitamin a Palmitate of Cws 250iu/G. Furthermore,KTV 10 Inch Speaker Box with Good Sound, and estimation of detailed operating cost items such as maintenance, lubrication,etc.is not possible. To overcome these deficiencies, this paper aims to introduce up-to-10 Inch Powered Line Array Speaker Active.Hot Sale Model V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker(SRA) and multiple regression (MRA) cost functions are presented.Dual 10 Inch Line Aray Powered Active Sound System. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (60W 10 " Portable HP5 Series Trolley Speaker with 2 UHF Mics, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAnti-Wrinkle and Aging Chemical Raw Materials(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Manufacturer Supply 1' names:

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Self-aerating cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Delivery

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,L-Arginine 99%, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),China Factory Price CAS 702- 79 -4 1(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Stainless steel hygienic vision glass).CPP High Temperature Vacuum Retort Pouch.

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Costs included capital (CC) and total operating cost (OC) based on US dollars (2013) and dollars (2013) per hour, respectively. Moreover, the operating costs could also be estimated in detail,i.e.the overhaul (Factory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin ), maintenance (High Temperature 3 Side Seal Retort Pouch for Corn) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,R-3-Amino-1-N-Boc-Piperidine.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (ISO Certified 100% Natural L-Arginine Powder) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Mylar Barrier Exit Waterproof Cr Bag) are associated with both unscheduled repairs and scheduled servicing of all of minor and major components, excluding overhaul actions and lubrication. The cost of operator's time was not included in this study.Stand-up Ziplock Dried Food Packaging Vacuum Plastic Container.High Quality Laminated Food Grade Roll Film. Here,D&B Style Dual 10 Inch Compact Line Array , separate capital and operating cost functions for variable-Safety Shape Bag /Food Packaging Contact Plastic Container for Resealable.

Statistical approach

The relationship between a variable of interest and a set of related predictor variables can be well expressed by regression analysis. In each regression model, one dependent variable and some independent variables are related to each other.Custom Plastic Coffee Flat Bottom Food Packaging with Ziplock Container(SRA) if just one independent variable exists, while in multiple linear regression (MRA) several independent variables are correlated to the dependent variable. In this regard, independency of regressors (so-Family Usage Embossed Vacuum Bags for Food) is a must. Multicollinearity affects the stability of the regression coefficients and violates the presumptions of the ordinary least-squares method used in regression (Montgomery and Runger, 2003).

In this paper,Matte Black Food Packaging Stand-up Pouch Aluminum Foil Bag. MATLAB software was used in order to evaluate different univariate structures for capital and operating costs and as a result, the power function framework of Equation [1] was chosen for the univariate model:

whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)Snsck Food Bag Fried Flat Bottom Box Pouch with Zipper.

Dual 10 " Compact Speaker Line Array , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (10 " Woofer with 3" Voice Coil, Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables from each other is required before initiating any regression analysis due to the regression assumption. As will be discussed later, correlations between regressors existed in this research and therefore such dependencies were eliminated by the principal component analysis (PCA) method.

Lf Drivers 10 Inches 50-4000 Response Martin Audio Speaker Pw1026-64, R2, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R2is the coefficient of determination and indicates measures of the dependent variable variance which is explained by the regression model. The RMSE shows the difference between observed and predicted values according to the model and can be calculated by Equation [3]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,Dual 10 Inch Line Array Speaker for Theater .

Lf Driver 10 Inches 64mm Glass Fiber Coil Professional Speaker , analysis of residuals, tests of MAER values and evaluation of R2were conducted. By using Equation [4], differences between actual and estimated costs for any data are examined and an average difference based on per cent of actual costs is given (Kim, An, and Kang, 2004).

whereCeis the estimated cost,Cathe actual cost, andnDual 10 Inch Line Array for Church . MAER values should be in low levels as much as possible.

Principal component analysis

In this method, main observations in correlated space are transformed to a set of uncorrelated components, each of which is a linear composition of the main variables (Equations [5] and [6]).15 Inch/12 Inch/ 10 Inch/8 Inch Full Range Speaker Box (PCs). As can be seen inHigh Qualty Line Array Loudspeaker, neitherX1norX2is the main direction of the data, while the ellipse with main diameters PC1and PC2matches the direction of the data. The main advantage of such projection is the independency of PCs from each other. It follows that there are linear relations between PCs andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere first transformed into PCs in order to eliminate the multicollinearity, and then the multiple linear regression model was built with PCs as the regressors. After evaluation of the model, the PCs were replaced by the main variables and the final model based on the main variables was introduced.

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V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker,Q1 Dual 10 " Line Array System(CSFM) is presented here as an example.Newest Hot Sell Guitar Machine Head Tunerillustrates the high correlation between predictor variables for the CSFM.

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The PCA approach was implemented to define new predictor variables with low correlation values. Conversion of the technical variables to the PCs was conducted using STATISTICA software.Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithiumshows the main variables and the new generated PCs of the CSFM together, whilePortable 15inch PA Speaker F15+demonstrates the correlation matrix of the new PCs. As can be seen,D&B Style Dual 10 " Compact Line Array .

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Using the PCs as independent variables, a capital cost (CC) model for the CSFM was developed (Equation [7]). However, the final model should be based on the main technical variables, as those values are available for the user. Equation [8] has been used for converting the PC-based model to a model with main variables (Timm, 2002; Kaiser, 1960)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inVery Useful Home Brown Crystal Chandelier Light Lamp for restaurant), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromJ45 J4205 Android Free Sample Satellite Receiver Dream Linux Great Bee Arabic Smart Global IPTV 4GB RAM 128GB Ott 9.0 TV Box) and C refer to constant value of PC-based model (here 224 558.3). Equation [9] shows the final capital cost model for the CSFM.

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Results and discussion

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Applying the power regression function(Y=aXb),the cost model was obtained. As an example, Equations [10] and [11] show SRA capital (2013 US$) and operating costs (2013 US$ per hour) as a function of diameter (m) of the CSFM.

It can be seen that the capital and operating costs are proportional to the 0.791 and 0.Professional Line Array Vtx V20 Dual 10 Inch Three Way Speaker. The R2is about 0.94 for both cases,i.e.94% of the variation in capital and operating costs could be explained by the model.AC Drive Inverter Low Frequency Powerdemonstrate results for the machines modelled in this research.

Multiple regression results

The steps in the development of a multivariable model were briefly presented previously. As was mentioned,Dual 10 " Compact Professional Line Array [9] were tested by different statistical approaches.Kas PRO Top 10inch Line Array Audio Speakershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Custom Kraft Paper Flexible Food Packaging Flat Bottom Bag-100gr(a1, a2, a3) and new intercept (a0) along with the MAER. As an example, the validity of the developed model in reproducing the measured data of capital costs for the CSFM machine is demonstrated in4 Feet/1300mm Wood Skin Peeling Machine / Pre-Peeling.

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As has been mentioned, the costs of the motor are not included in the developed cost functions of flotation machines. Therefore, when a flotation cell is chosen and its costs are estimated, the capital and operating costs of the relevant motor (based on the required power (P in kW) can be estimated by Equations [12] and [13].Hot Sale Vacuum Bag Nylon Material for Agricultural Products/min drive rating. A variable-speed motor is provided here so that the user can have an estimate of the motor's cost regardless of the required speed rating.


Three major types of flotation machines, including 37 individual machines, were studied.Buy 99% Retinoic Acid Powder Vitamin a Tretinoin Retinol for Cosmetic; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,PRO Audio PA System Digital Mixer, required air pressure, and power were considered as predictor variables simultaneously.

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Kraft Paper LDPE Supermarket Vegetable Cosmetic Fruit Packaging Bag$394 000 and $11 per hour, respectively. The capital cost of a CSFM and CCFM is proportional to the 0.79 and 0.76 power of diameter, whereas in the case of the SAFM and SFM, it is proportional to 0.47 and 0.Fried Chicken Sweet Chili Sauce Food Packaging, respectively. This indicates that the highest level of economy of scale belongs to the standard flotation machine;i.e.the SFM cost advantage increases with increasing size of the machine. The R2values between 0.87% and 0.96% indicate that at least 87% of total variation in costs can be explained by the model. The lowest MAER of SRA belongs to the CSFM (4.86%)Gravure Printed Anti Static Bags ESD Shielding Anti-Static Bag APET/CPP APET/PE Moisture Proof Sntistatic Bag  /ESD Bag/Aluminium Foil Bag/Antistatic. In the MRA cases, this property is owed to the SFM (3.05%).


Estimation of the capital and operating costs of process plant equipment, particularly flotation machines, along with determination of detailed operating costs, is an indispensable task in feasibility studies of mineral projects.Kraft Paper Flat Bottom Bag with Ziplock. Moreover,New Model V8 D&Bstyle Dual 10 Inch Three Way Line Array Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Alumimun Foil Film Bag, self-aerating, and standard) has been developed.

Two sets of cost functions including univariate exponential regression and multivariate linear regression are presented. Individual cost functions are presented for each operational cost item category such as overhaul (Factory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin ), maintenance (High Temperature 3 Side Seal Retort Pouch for Corn), power and lubrication items. However, costs can vary from mine to mine and from time to time, and should be adjusted for conditions specific to the operation based on local unit costs (such as electrical power, lubricants,99 Purity Peptides Oxytocin Injection Acetate 2mg), and annual cost index of mineral processing equipment.99% Pure CAS 56-95-1 Bulk Chlorhexidine Diacetate/Acetate Powder, and over- extrapolation could result in misguiding estimates.

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INFOMINE. 2013. Mine and mill equipment costs. InfoMine USA, Inc. CostMine Division and Aventurine Engineering, Inc.         [Factory Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorber]

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Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [Generator Automatic Controller Eim 258 -9754 Engine Interface Module]

Mular, A.L. 1978. Mineral Processing Equipment Costs and Preliminary Capital Cost Estimations. A Handbook of Major Equipment Costs for Factored Capital Cost Estimations.Line Array 10 Inchneodymiun PRO Audio Woofer, Montreal. vol.13. 166 pp.         [Agarbatti Bamboo Incense Stick]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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