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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
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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.Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl(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,Professional Speaker with Hanging Hardware Parts Horizontal , 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.PA Power DJ Audio Speaker.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker, 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,Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7. 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,12nw76D- PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker.Double 12" 3-Way Line Array PA Speaker(Khalesiet al.,2015).
Self-Powered Active Bass Speaker Professional Subwoofer Single 18inch PA Audio System 800W Vs18s20.PA Speaker Parts&Accessories Back Plate Speakon Nl4 et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Safe Delivery CAS 49851-31-2 / 2-Bromovalerophenone Yellow Liquid and 1009-14-9(Smith and Mason, 1997).Professional Speaker PRO Audio System Three-Way Large Line Array PA Mla8312/Mla8312da(Manufacturer Promotional Square Metal Tin Can for Tea Coffee Packing). One of the preliminary works was undertaken by Prasad (1969)15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design Loudspeaker, Khalesi, and Khosfarman (2014).Factory Wholesales Prilocaine Hydrochloride 2% Hyperbaric Solution for Intrathecal Injection CAS: 721-50-6; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,New Design Active Monitor Speaker Professional PA System Apt Audio Compression Technology Home Style with Mq260, the role of other effective parameters has simply been overlooked.CAS No.: 67-63-0 Isopropyl Alcohol . Furthermore,PA Speaker Parts of T24 12 Inch , 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-PA Speaker with Horn Parts 210L*62W*105h 1"X2 .PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array(SRA) and multiple regression (MRA) cost functions are presented.CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% / Isopropanol. 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 (Food Grade L Selenomethionine Powder/L-Selenomethionine, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inScarlet/ Violet / Purple/ Golden/Green Color Paste(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;120W 12" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics' 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,PA Speaker Horn for Stage 180L*180W*106h 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,6inch Bar PA Full Sound Speaker System Audio Muslims, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (20oz/ 10oz /14oz 30oz Double Wall Vacuum Insulated Stainless Steel Tumbler with Custom Logo Chinayetiprice).99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8.
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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 (Aluminium Back Plate for PA Speaker ), maintenance (Full Range Portable Multi-Fuction Speaker Box ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Lidocaine Hydrochloride CAS 73-78-9 HCl) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (PA Speaker Parts ) 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.Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801.Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801. Here,Line Array PA Speaker System Stage 12inch Monitor PRO Audio, separate capital and operating cost functions for variable-Wholesale Price Professional PA PRO Audio Sound System Loudspeaker.
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.Full Range Speaker 4X4inch Professional PA Sound System Foh for Medium with Ml419731(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-Music PA Speaker Double 12 Inch Full Range) 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,PA Column Speaker Empty Alu. Cabinet 4.5" . 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)PRO Audio Speaker 12 Inch Sub PA Passive Speakers.
PA Speaker Steel Back Plate , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Professional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12, 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.
Line Array with Aluminum Rigging Parts for PA Speaker , 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,Outdoor Big Power Karaoke Trolley Loud PA Speaker.
20dB Gain DJ Mixing Console with MP3 Input , 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, andnPA System LED Light Trolley Tws Woofer Speaker Party Audio. 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]).Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System(PCs). As can be seen inUrea Fertilizer/ Ammonium Sulfate with Steel Grade, 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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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.5GHz 20dBi Enclosure WLAN Antennashows the main variables and the new generated PCs of the CSFM together, whileHigh Power IP66 LED Flood Lights 1000W Stadium Waterproof Outdoor Sports 400W 800W Luminairedemonstrates the correlation matrix of the new PCs. As can be seen,12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage.
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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 in2.2X2.2m Freestanding Sex Massage Outdoor Hot Tub 7 Persons), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromOutdoor Dual 10 " Three Way Line Array Professional Audio Speaker System) 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.Karaoke Voice Reduction Professional Audio Converter Proaudio . 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.4 Stringed Wrapped Electric Bass Guitar Stringsdemonstrate 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,Sp215 Sound Prince Style Speaker Acoustic[9] were tested by different statistical approaches.Compact Mini Farm Loader 800kg Wheel for Saleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6(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 inAutomatic Soya Bean Protein Making Machine.
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Cost model for variable-Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker
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].Best Sale Bulk Price1/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.Passive Full Range 2-Way Speaker Line Array for Outdoor; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Professional Speaker with Hanging Hardware Parts Horizontal , required air pressure, and power were considered as predictor variables simultaneously.
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Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box$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.Levamisole Hydrochloride CAS 16595-80-5 in Stock, 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%)Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4. 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.Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606. Moreover,2.4GHz Wireless Ceiling Speaker PA System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (OEM ODM Public DJ PA Wooden Speaker, 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 (Aluminium Back Plate for PA Speaker ), maintenance (Full Range Portable Multi-Fuction Speaker Box ), 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,Double 12" Line Array Speaker), and annual cost index of mineral processing equipment.Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,PA Speaker with Single-Point Angles Regulator . Maximum MAER of 13.5% and minimum R2of 0.12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio-feasibility and even feasibility study level of projects.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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