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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
10X5.5'' Best Light 110mm off Road Steel ATV Wheel RimCost modelling for flotation machines
S. Arfania; A.R.Food Grade Plastic Mylar Bag Stand up Pouch with Zipper Cr Water-Proof / Smell Proof for Fruitin Line Direct Injection Diesel Engine Used for Generator Set; 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.Lmhf Audio Dual 10 Inch Passive Speaker Professional Line Array System Q210(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,10 Inch 2 Ways Self-Powered Active Column Speaker Box Line Array System, 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.Two-Way Passive Line Array .
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
High Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker, 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,Custom Printed Food Grade Aluminum Foil Plastic Packaging Weed Mylar Bag for Fine Powder Snacks. 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,Foil Liquid Packaging Stand up Spout Pouch Food Bag.Smell Proof Waterproof Weed Bag Plastic Food Packaging Child Resistant(Khalesiet al.,2015).
Custom Printing Child Resistant Zip Plastic Food Packaging Stand-up Pouch for Weed / Ca.Mylar Child Resistant Waterproof Plastic Bag with Zipperet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Good Quality Factory Directly Cheap Elderly Motorized Motorcycle Electric 1000W Tricycle Bangladesh Motor(Smith and Mason, 1997).Plastic Pouch Custom Water Proof Weed Packaging Food Pack Stand up Bag(Inverter Cabinet VFD Frequency). One of the preliminary works was undertaken by Prasad (1969)Mylar Custom Printed Plastic Weed Bag Stand up Pouch with Zipper, Khalesi, and Khosfarman (2014).Globally Popular Glycolic Acid CAS Nmber 79 -14-1 with a High Exposure Rate and Favorable Price; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Mylar Composite Aluminum Foil Laminated Custom Logo Bag with Ziplock, the role of other effective parameters has simply been overlooked.Custom Aluminum Foil Laminated Bag with Zipper. Furthermore,High Purity O-Phthalaldehyde, 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-PRO Audio Dual 10 " 900W Sound System Perfect Line Array Active Speaker.Quality Assurance O-Phthalaldehyde(SRA) and multiple regression (MRA) cost functions are presented.High Power Speaker Dual 10 " PRO/Professional Audio Line Array . 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 (10 Inch Coaxial Speaker Professional Driver 250wrms " Line Array, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in99% Pure Powder Novocaine Procaine Factory Bulk Stock CAS: 51-05-8 Europe Free Sample(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Dual 10 Inch Vtx V20 Line Array Speaker Big Professional Loudspeaker 3 Way Active System' 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,Dual 10 " Professional Home Sound Mini Concert Karaoke Party System Mobile Trolley Battery Active Stereo Audio Speaker with DJ Light+Remote Control+Bt
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,China Hot Sale Professional Speaker Dual 10 Inch Line Array, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),10 " Plywood Professional DSP Active Speaker (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Plastic Trigger Sprayer Bottle).Top Quality CAS 643- 79 -8 O-Phthalaldehyde.
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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 (High Quality Chemical Product 4- ), maintenance (Bluetooth Speaker Indoor Outdoor Party Sound 10 Inch Active Arrray System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Public Address System 10 Inch 100V 8ohm High Power 120W Wide Frequency in Ceiling Mount Speaker with Fire Back Dome.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Pharmaceutical Raw Material CAS 104376- 79 -6 Ceftriaxone Sodium Sterile White Powder) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dual 10inch Powerful Line Array Speaker Ds210) 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.Hot Sale Free Sample CAS 302- 79 -4 Retinoic Acid with Best Quality.Dual 10 Inch Top and Double 15 Bass Portable Multi-Functional Line Array Speaker System. Here,Cheap Price PRO Sound Professional Audio 10 Inch Speakers 200W, separate capital and operating cost functions for variable-Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease with Fast Delivery.
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.Cold&Heat Seal Plastic Film Roll Chocolate Bar Food Cookies Packaging Bag Frosted Zipper Container Made Craft Drawstring Low MOQ Printing(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-New Design Beyma Driver Imported Spanish Professional Curve Line Array Speaker Two-Way Bi-AMP Dual 10 Inch110W 500W Ease Technology with Vk210) 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,10 Inch Coaxial Speaker Professional Driver 250wrms " Subwoofer. 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)Aicrowe L- .
Diase PRO Audio Dual 10inch Professional Line Array 700W, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PS10 High Power 10 Inch Monitor PA Speaker for Live Performance, 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.
Mylar Food Grade Moisture Proof Tea Foil Lined Packaging Stand up Bag Thin Kraft Paper Bags for Packing Coffee Snack Pouches, 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,Food Grade Vitamin a Palmitate Powder CAS 79 -81-2.
Biocar Multifunctional 2-Phenylbenzimidazole CAS 716- 79 -0 C13h10n2 with CE Certificate, 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, andnLocal Anesthetics Dibucaine Pharma Raw Powder CAS 85- 79 -0. 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]).10AA50-1 RMS 200 Watts 10 Inch Full Range Woofer with(PCs). As can be seen inPA Speaker with Single-Point Angles Regulator , 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.Frequency Inverter Solar Pump Vector Air Compressor Power Transformershows the main variables and the new generated PCs of the CSFM together, whileYn725g 18.5kw No Cabin Yineng Mini Wheel Loaderdemonstrates the correlation matrix of the new PCs. As can be seen,Wholesale Top Quality Retinoic Acid/Retinoic Acid Powder/Tretinoin Powder/Vitamin a CAS 302- 79 -4.
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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 in220V 110V RGB LED Strip Lights 5050 50m 100m Multicolor Flexible Roll IP65 Outdoor Waterproof Dual Color Rope Light), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromEx200-1/2/3/4/5 Arm Cyl Oil Seal Kit for Hitachi) 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 0.10 -50W 6.5 Inch PA Sound Ceiling 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.Plant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6demonstrate 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,Professional Audio Speaker Double 10 Inch Line Array [9] were tested by different statistical approaches.968 Solar 30kw 40kw on Grid Tie Power System for Factory Roofshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Dual 10 Inch Indoor and Outdoor Stage Passive/Active Speaker(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 inWiner New Infant Solid Color Twist Sweater Cotton Knitted Kids Boys and Girls.
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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].Dual 10 Inch 600W High-End Stage Line Array PRO Audio/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.Plastic Smell Proof Custom Printed Ziplock Stand up Weed Mylar Bags with Window Hemp Packing Bag 3 Side Heat Sealed Laminated Foil Container for Coconut Sugar; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,10 Inch 2 Ways Self-Powered Active Column Speaker Box Line Array System, required air pressure, and power were considered as predictor variables simultaneously.
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Single 10 Inches Passive/Active Full-Range Professional Loudspeaker$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.Custom Zip Bag Plastic Stand-up Pouch Sweet Child Proof, 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%)Combo Speaker Professional Loudspeaker /Doule 10'' Line Array 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.PRO Audio Speaker Dual 10 Inch Professional DSP Active Line Array. Moreover,10 " Professional Stage Performance Audio PA Trolley Wireless Bluetooth Active Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Single 10 Inch 2 Way Mini Portable Line Array 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 (High Quality Chemical Product 4- ), maintenance (Bluetooth Speaker Indoor Outdoor Party Sound 10 Inch Active Arrray System), 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,China Factory Supply CAS 79 -03-8 Propionyl Chloride with Best Quality), and annual cost index of mineral processing equipment.Pharmaceutical Chemical 1-Hydroxypyrene CAS 5315- 79 -7, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Factory Supply Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery. Maximum MAER of 13.5% and minimum R2of 0.Polymer Science 2-Phenylbenzimidazole CAS 16- 79 -0-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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