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Disperse Red 1 200% B
On-line version ISSN2411-9717
Print version ISSN2225-6253
J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017
http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â
GENERAL PAPERS
Adult Foldable Fold Road Bike MTB Mountain Bicycle Sdc -902Cost modelling for flotation machines
S. Arfania; A.R.Double 12" Line Array SpeakerVera 12 Loudspeaker Line Array Speaker System; M.R. Khalesi
Tarbiat Modares University, Iran
SYNOPSIS
Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01(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,PA Speaker with Single-Point Angles Regulator , 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 0.12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth, 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,Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2. 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,CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%.High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price(Khalesiet al.,2015).
Pharmaceutical Intermediate Bulk Price N- .Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supplyet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for China Manufacture Poly Zipper Food Packaging Plastic Pouch Bags for Soup Eco Friendly Corn Starch Ziplock Stand Up100% Compostable Biodegradable Clear(Smith and Mason, 1997).Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand(Universal Vector Inverter). One of the preliminary works was undertaken by Prasad (1969)Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl, Khalesi, and Khosfarman (2014).Speaker System High Power H3; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical, the role of other effective parameters has simply been overlooked.Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4. Furthermore,500W Powered Speaker Professional Sound Line Array System , 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-Proxima Entertainment Z-450 Digtal Speaker.Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500(SRA) and multiple regression (MRA) cost functions are presented.Lat210A Srx700 Series PA Sound System Professional Speakers. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.
Methodology
Data
Thirty-seven major flotation machines (Professional Public Address Mini Onwall Line Array Speaker , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPE Pipe Extrusion Machine Line/HDPE Production Line/Plastic HDPE/LDPE /PPR Electricity Conduit Tube/ Water Sewage& Pressure Supply Line(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Q1--Dual10 Inch Line Array Speaker' 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,Wholesales Organic Intermediate 1
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Live/Installed Sound System PRO Speaker Box (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Kllisre DDR3 8GB RAM 1600 1333 No Ecc Desktop PC Memory 240pins System High Compatible).Outdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PA.
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 (Professional Speaker with Laser Light ), maintenance (XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4) 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.High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price.Free Sample Organic Chemicals 1. Here,High Quality Phena, separate capital and operating cost functions for variable-Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4.
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.18" Fane Style Aluminum Speaker Frame(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-18" Die Cast P-Auido Style Aluminum Frame) 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,Professional Stage Active Line Array Speaker with DSP. 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)Single 18" Subwoofer Speaker Box.
Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (12" Professional Rcf Style Speaker Frame, 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.
Horn Professional Speaker H3, 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,Coaxial Loudspeaker TD12.
18'' Subwoofer Speaker Box Ls1200, 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 12" Subwoofer Speaker Box. 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]).DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional(PCs). As can be seen inMini Kd Key Generator Remotes Warehouse in Your Phone Support Android Make More Than 1000 Auto Similar Kd900, 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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Professional Speaker Box F12+,Df B&C Trees Speaker Subwoofer Audio Professional(CSFM) is presented here as an example.2876 10kw Home Used Solar Power System on Grid Roofillustrates 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.Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouseshows the main variables and the new generated PCs of the CSFM together, whileRGB Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reportsdemonstrates the correlation matrix of the new PCs. As can be seen,15'' Coaxial Speaker .
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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 inWholesale New Fashion White Striped Balloon Sleeve Female Long Cardigan for Women), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromPA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array) 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.China Factory Supply Ethylmagnesium Bromide CAS 925-90-6. 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.Custom Printing Food Packaging Plastic Bags with Resealable Zipperdemonstrate 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,Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker[9] were tested by different statistical approaches.Aftermarket Hdy. Cyl Repair Kits for Cat Diggers/0965606shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Manufacturer Supply Bdo Novel Intermediate 1(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 inHome Solar Power System Lights Rechargeable Wireless IP55 Waterproof Camping Spotlight.
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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].99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6/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.
Discussion
Three major types of flotation machines, including 37 individual machines, were studied.China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,PA Speaker with Single-Point Angles Regulator , required air pressure, and power were considered as predictor variables simultaneously.
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Dm 15 Inch PA Full Sound Systems Professional PRO Speaker$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 0.12inch KTV Bar PA Full Sound Speaker System Audio, 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%)Dare Dual 8" Neodymium Active Line Array Set PA System. In the MRA cases, this property is owed to the SFM (3.05%).
Conclusion
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.12" Die Cast Aluminum PA Speaker Frame. Moreover,PA Speaker Dual 18" Subwoofer System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (PA Speaker with Line Array Tweeter Horn , 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 (Professional Speaker with Laser Light ), maintenance (XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker), 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,Active Mini Line Array Speaker with DSP Amplifier Module), and annual cost index of mineral processing equipment.Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder, and over- extrapolation could result in misguiding estimates.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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