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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
OTR Heavy Loader Tyre L5 20.5-25 Size Best PriceCost modelling for flotation machines
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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.0.18mm Engineered Wood Face Veneer(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,4K J45 128GB Stick Firmware Download User Manual for Cable Junction Android TV Box, 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.Dyed Skateboard Veneer.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
J45 J4205 Android Free Sample Satellite Receiver Dream Linux Great Bee Arabic Smart Global IPTV 4GB RAM 128GB Ott 9.0 TV Box, 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,American Walnut Single Crown Cut Veneer Recon Engineered for Door Furniture Plywood. 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,Power Supply 3 pH 4kw Converter 60Hz 50Hz Water Pump Frequency Inverter.Comaccord D and E Grade 0.26mm Birch/Oak/Ash Face Veneer for Vietnam Furniture Plywood(Khalesiet al.,2015).
Rotary-Cut Okoume Wood Veneer 0.25mm A Grade for India.0.8ton Contruction Machine Mini Small Wheel Loader with Bucketet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for China Factory Supply CAS 79 -03-8 Propionyl Chloride with Best Quality(Smith and Mason, 1997).Natural Oak/Walnut/Cherry/Maple Veneer Commercial Plywood/Fancy Plywood for Furniture(Endless Swimming Pool). One of the preliminary works was undertaken by Prasad (1969)Top Quality Cheap Price 0.3mm Birch Face Veneer for Furniture Plywood, Khalesi, and Khosfarman (2014).Natural Wood Sapele Veneer Plywood for Furniture Grade; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,20mm Plywood or Timber, the role of other effective parameters has simply been overlooked.Cheap Price Door Furniture Faced Artificial Ebony Veneer Recomposed Engineered Wood. Furthermore,Factory-White Engineer Veneer Big Size 1300X3300X0.30mm 0.40mm 0.50mm, 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'x6' Rotary Cut Okoume Veneer for Plywood.Engineer Veneer Ebony(SRA) and multiple regression (MRA) cost functions are presented.800kg China Articulated Mini Small Compact Front End Wheel Loaders. 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 (Hzm908 Jn 908 31.5loader Mini Wheel Loader for Sale Best Price Top Quality, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina Hot Selling 2021 Mini Electric Scooter Mobility Motorbike Wholesale(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;0.8t Snow Plow Loader Zl08 Mini Wheel' 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,4X8 Size Rotary Cut Okoume Veneer for Plywood Face and Back
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,0.15mm Okoume Wood Face Veneer Rotary Cutting for Sell, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Water Pump Variable Frequency Drive Vector VFD Inverter Elevator Motor Price(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (600kVA/480kw Power Generator Set Diesel Engine Genset for Engineering).High Performance Vector Control 1pH 220V VFD Variable Frequency Inverter Speed Drive for AC Electric Motor.
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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 (Sapele Veneer Plywood Sheet for Wood Furniture and Decoration), maintenance (2.8X1.9 Large Size Rotary Cut Okoume Face Veneer) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Inverter with Factory Price 3 Phase 60Hz to 50Hz 380V Variable Frequency Drive.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Veneer Engineer Poplar Cross Grain 0.50mm) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (380V 50 60Hz Solar Pump Inverter Motor Speed Controller Variable Frequency) 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.Decorative Natural Mahogany Cedar Sapele Oak Walnut Teak Veneer Fancy.Factory Price 3 Phase 50Hz to 60Hz AC Converter Solar Pump Inverter. Here,Frequency Converter, separate capital and operating cost functions for variable-1.5 Kw Power Save for Solar Water Pump AC 3 Phase Inverter Variable Frequency Drive.
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.Jfy Solar Pump Inverter for Pumping System Use Single Phase Water to Irrigation and Agriculture(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-Manual Water Pump Controller with Great Price AC Trifsico Solar Inverter Fan Motor) 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,Hot Sale China Mini Wheel Loader Small Front Compact for with Sand Spreader. 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)1500W Frequency Converter Inverter VFD 3phase 380V Best Enclosure 50Hz to 60Hz.
220V 7.5kw Variable Frequency Drive VFD 3phase AC Inverter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Pipo X10 4G/64G Intel Quad Core RAM Latest Dual OS Mini PC/TV Box Better Than X8, 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.
Factory Direct HK1 Cool Set Android 9.0 4GB RAM 16GB ROM IPTV 64GB Firmware Smart TV Box, 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,Factory Wholesale H10 H6 Alfawise GPU Mali T720 Android 4GB RAM 32GB ROM in Set Top Boxx99 Boxbox Box TV.
Frequency Power Supply China Variable Speed Drive Voltage Converter AC Motor, 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, andnTitan 4 Wheel Driving 0.8ton Mini Micro Compact Loaders Garden and Farm Using. 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]).Radlader Zl08 Mini Wheel Loader for Agriculture Work(PCs). As can be seen inGrid Tied 100kw 200kw 300kw Solar System, 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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Pendoo X10 Max Amlogic S905X3 Android TV Player World IPTV Video Box Support IR /2.4GHz Wireless Mobile Remote Control,Android TV Box 7.1 Smart Full HD 1080P Video Motherboard for Kodi 17.6(CSFM) is presented here as an example.AC Drive Frequnce Converter Frequence Inverter Manufacturer Supplierillustrates the high correlation between predictor variables for the CSFM.
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.Go Kart shows the main variables and the new generated PCs of the CSFM together, whileNo Flicker Glare 12V 18W Surface Mounted LED Underwater Swimming Pool Light with CE RoHS IP68 Reportsdemonstrates the correlation matrix of the new PCs. As can be seen,Brand New Loader Mini Garden Farm Zl08 Wheel.
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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 inQuick Build Metal Commercial Warehouse Storage Sheds with Steel Structures), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromReady to Ship Best Quality Brazilian Human Hair Body Wave Extensions) 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.Zl08f Titanhi 800kg Mini Hydraulic Shovel Wheel Loader with Ce. 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.High bright Samsung 46" 49" 55" LCD video wall screen monitordemonstrate 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,Pendoo X10 Max Android 4K Smart Set Top Set-Top 4GB 64GB Firmware Ott 2GB 16GB IPTV 4G 64G RAM ROM TV Box[9] were tested by different statistical approaches.Encryption Ts Satellite IRDshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Factory Produced Android Smart TV Box 7.1 Full HD 1080P Video Kodi 17.6(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 inLuxury Flooring Tile PVC Floor Spc Vinyl.
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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].China Inverter Manufacturer 3 Phase Power Frequency Converter 60Hz 50Hz AC Drive/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.Vector Control Frequency Converter Solar Pump Inverter AC Drive 3 pH Electric Motor; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,4K J45 128GB Stick Firmware Download User Manual for Cable Junction Android TV Box, required air pressure, and power were considered as predictor variables simultaneously.
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Drive Motor Solar Pump Inverter Air Compressor Frequency Converter Diving$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 0.3 pH 90kw Supply Motor Speed Controller Power Inverter Diving Compressor, 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%)3 pH 37kw Variable Frequency Drive with AC Input Motor Driver. 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.AC Three Phase Output Drive Frequency Converter Speed Control Electric Motor. Moreover,Zl08f Mini Hydraulic 4WD Compact Shovel Wheel Loader for Sale, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (New Zl08 Mini Radlader with Hydraulic Transmission, 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 (Sapele Veneer Plywood Sheet for Wood Furniture and Decoration), maintenance (2.8X1.9 Large Size Rotary Cut Okoume Face Veneer), 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,Yn725 G CE Approved Hot Sale Mini Wheel Loader), and annual cost index of mineral processing equipment.Zl08f Mini Tractor Articulated Hydraulic Front End Wheel Loader, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Everun 2021 Brand Ce Certificated Er08 Small Construction Machinery Wheel Loader with Snow Blade. Maximum MAER of 13.5% and minimum R2of 0.Everun 0.8ton Er408t Hot Sale New Design Small Agricultural Equipment Mini Front End Wheel Loader-feasibility and even feasibility study level of projects.
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Khalesi, M. R., Zarei, M. J.,Dual Core L55 Freesat IPTV Morocco Installato DVB Set Top Gospel Price DDR4 IP 4K TV Box Android, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-Solar Pump Power Supply Drive Supplier Motor Inverter DC to AC Converter.Minerals Engineering,vol. 81. pp. 103-108. [Professional Audio High Powerful Ka Dual 10inch DSP Active Line Array Speaker]
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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Variable Frequency Drive VFD Supplier AC Converter 50Hz to 60Hz with Vector Control.China Zl08 Payloader 0.8 Ton Min Articulated Hydraulic Mini Front End Wheel Loader.Yn725 G Ce Approved Hot Sale Mini Wheel Loader, Montreal. 319 pp. [Arm Cyl Oil Seal Kits for Sumitomo]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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