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



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S. Arfania; A.R.Veneer Engineer Poplar Cross Grain 0.50mm15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design Loudspeaker; 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.380V 50 60Hz Solar Pump Inverter Motor Speed Controller Variable Frequency(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,Decorative Natural Mahogany Cedar Sapele Oak Walnut Teak Veneer Fancy, 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.Factory Price 3 Phase 50Hz to 60Hz AC Converter Solar Pump Inverter.

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


Frequency Converter, 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,1.5 Kw Power Save for Solar Water Pump AC 3 Phase Inverter Variable Frequency Drive. 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,Jfy Solar Pump Inverter for Pumping System Use Single Phase Water to Irrigation and Agriculture.Manual Water Pump Controller with Great Price AC Trifsico Solar Inverter Fan Motor(Khalesiet al.,2015).

Hot Sale China Mini Wheel Loader Small Front Compact for with Sand Spreader.1500W Frequency Converter Inverter VFD 3phase 380V Best Enclosure 50Hz to 60Hzet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 3kw Solar Power System for Home Use on Grid(Smith and Mason, 1997).220V 7.5kw Variable Frequency Drive VFD 3phase AC Inverter(Everun Er408 800kg Construction Equipment Compact Mini Wheel Loader with Bucket). One of the preliminary works was undertaken by Prasad (1969)Pipo X10 4G/64G Intel Quad Core RAM Latest Dual OS Mini PC/TV Box Better Than X8, Khalesi, and Khosfarman (2014).Factory Direct HK1 Cool Set Android 9.0 4GB RAM 16GB ROM IPTV 64GB Firmware Smart TV Box; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Factory Wholesale H10 H6 Alfawise GPU Mali T720 Android 4GB RAM 32GB ROM in Set Top Boxx99 Boxbox Box TV, the role of other effective parameters has simply been overlooked.Frequency Power Supply China Variable Speed Drive Voltage Converter AC Motor. Furthermore,Titan 4 Wheel Driving 0.8ton Mini Micro Compact Loaders Garden and Farm Using, 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-Radlader Zl08 Mini Wheel Loader for Agriculture Work.Hzm908 Jn908 31.5 Tyre Loader Best Price Hot Sale(SRA) and multiple regression (MRA) cost functions are presented.Pendoo X10 Max Amlogic S905X3 Android TV Player World IPTV Video Box Support IR /2.4GHz Wireless Mobile Remote Control. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Android TV Box 7.1 Smart Full HD 1080P Video Motherboard for Kodi 17.6, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMc4 Electronic Connector(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Brand New Loader Mini Garden Farm Zl08 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,1.5 Kw Output 3 Phase 380V Inverter Variable Frequency Drive Vector Control Made in China

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 Inverter Manufacturer 3 Phase Power Frequency Converter 60Hz 50Hz AC Drive, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Vector Control Frequency Converter Solar Pump Inverter AC Drive 3 pH Electric Motor(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Light Brown Color Standard Hook & Loop Tape Factory OEM Sale).AC Converter Variable Frequency Drive 3 pH 0.75kw Output Power Supply.

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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 (11kw 3 Phase Frequency Converter Solar Water Pump Power Inverter Controller), maintenance (Drive Motor Solar Pump Inverter Air Compressor Frequency Converter Diving) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,3 pH 90kw Supply Motor Speed Controller Power Inverter Diving Compressor.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (3 pH 37kw Variable Frequency Drive with AC Input Motor Driver) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (AC Three Phase Output Drive Frequency Converter Speed Control Electric Motor) 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.Zl08f Mini Hydraulic 4WD Compact Shovel Wheel Loader for Sale.New Zl08 Mini Radlader with Hydraulic Transmission. Here,Yn725 G CE Approved Hot Sale Mini Wheel Loader, separate capital and operating cost functions for variable-Zl08f Mini Tractor Articulated Hydraulic Front End Wheel Loader.

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.Everun 2021 Brand Ce Certificated Er08 Small Construction Machinery Wheel Loader with Snow Blade(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-Everun 0.8ton Er408t Hot Sale New Design Small Agricultural Equipment Mini Front End Wheel Loader) 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,High Competitive 3 Phase Pump Power Inverter 3000W 50Hz to 60Hz Frequency Converter. 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)Wolf Mini Loader Wl80 with Grass Cutter.

Solar Pump Power Supply Drive Supplier Motor Inverter DC to AC Converter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Eougem 0.8 Ton Payload Zl08 Front End Loader New Hydraulic Articulated Small Wheel, 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.

2500*640mm E1 Glue Engineer Veneer Wenge/Oak for Decoration, 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,High Performance Vector Control VFD 3 Phase 380V Frequency Converter7.5kw Inverter for AC Motor.

Zl08 0.8t Articulated Front End Wheel Loader with Pallet Fork, 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, andnFace Veneer Nature Bamboo for Fancy Plywood. 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]).White Birch Veneer in 0.28mm/Jacky(PCs). As can be seen inPlastic Clear White Stand-up Drinking Liquid Spout Food Packaging Bag, 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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Factory-Hardwood Veneer in 1300X2500mmx 0.60mm,Yn725 G Ce Approved Hot Sale Mini Wheel Loader(CSFM) is presented here as an example.Disperse Dyestuff Violet 200% P-CF for Textileillustrates 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.High Speed UPVC/CPVC/PVC Water Sewage/ Pressure& Electricity Conduit Pipe Extrusion Machineshows the main variables and the new generated PCs of the CSFM together, whileNew Model High Technology Efi CBS LED 250cc 4 Valves Oil Cooled Retro Gasoline Motorcycles Race Motorcycledemonstrates the correlation matrix of the new PCs. As can be seen,Variable Frequency Drive VFD Supplier AC Converter 50Hz to 60Hz with Vector Control.

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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 inin Stock China Facemask 3 Ply Earloop Doctor Disposable Face Mask), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromDouble Slipper Two Upper End Freestanding Soaking New Bath Tub) 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 0.0.8ton Compact Loader Wheel in Europe. 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.Luxury Mink Wig Raw Peruvian Hair 100% Unprocessed Human Body Wave Full Lace 18inchesdemonstrate 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,4 Kw China Frequency Converter Power Supply Motor Drive 3 Phase Inverter[9] were tested by different statistical approaches.Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kartshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.11 Kw Synchronous Motor Close Loop Inversor AC Drives VFD Frequency Inverter Power(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 inProfessional 10PCS/Set Fish Hooks Mermaid Shape Makeup Brushes Eyeshadow Eyeliner Foundation Powder Blush Lip Face Cosmetic Concealer Fun Brush.

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Cost model for variable-Yn725 Yineng Mini Wheel Front Loader

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].Yn725g Yineng Mini Wheel Loader 18.5kw Without Cabin/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.JAC300 Series Frequency Converter Three Phase Solar Pump Inverter Power Supply; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Decorative Natural Mahogany Cedar Sapele Oak Walnut Teak Veneer Fancy, required air pressure, and power were considered as predictor variables simultaneously.

Yn725g Yineng Mini Wheel Loader 18.5kw Without Cabin. Moreover, the operating cost was detailed in different cost items.Km3 Collective 4GB 64GB TV Box Google Certified ATV, indicated in0.15mm Rosewood Veneer, and major extrapolation should be avoided.

China Everun Er408t 0.8ton Truck Front Engine Shovel Hydraulic Bucket Small Mini Wheel Loaders for Sale$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.Natural Wood Woven and Strand Bamboo Veneer Sheets Comaccord, 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%)High Quality Ebony Engineered Wood Veneer for Hot Sale. 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.China Manufacturer Decorative Engineered Wood Veneer. Moreover,Reliable Producer Everun Supply Er08 CE Approved 2021 Hot Sale Compact Mini Wheel Loader with Bucket, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Gabon Okoume Veneer a B C D Grade From Factory to India, 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 (11kw 3 Phase Frequency Converter Solar Water Pump Power Inverter Controller), maintenance (Drive Motor Solar Pump Inverter Air Compressor Frequency Converter Diving), 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,Hot Sale Natural Wood Veneer Burma Teak Quarter Cut for Plywood Door India Pakistan), and annual cost index of mineral processing equipment.Hot Sale Birch Wood Veneer Core for Plywood, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Pendoo X10 Max International Best Custom Set Top Box 4GB 32GB TV Converter Ott 4K Smart Android. Maximum MAER of 13.5% and minimum R2of 0.China Everun Er408t 800kg Earth-Moving Mini Front Wheel Loader for Sale-feasibility and even feasibility study level of projects.


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Lashgari, A.Construction Machine Mini Loader Zl08 with Factory Price Front End, A.R. 2013.Pipo X10 PRO TV Box 4G RAM 64G ROM Z8350 Chipset Windows Mini PC Intel Digital Receiver Media Player,Hybrid 3kw Solar Grid Tied Roof Top System Home Power,vol. 23. pp. 441-446.         [Wholesale Custom Logo Eliminates 99.99% of Germs Alcohol Hand Sanitizer]

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Mohutsiwa, M. and Musingwini, C. 2015. Parametric estimation of capital costs for establishing a coal mine: South Africa case study.Intel TV Box Pipo X10 PRO 4G RAM 32g ROM Z8350 Chipset Media Plyer Win10 Windows Mini PC,vol. 115. pp. 789-797.         [Radiate Pine Face Veneer]

Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500]

Mular, A.L. 1978. Mineral Processing Equipment Costs and Preliminary Capital Cost Estimations. A Handbook of Major Equipment Costs for Factored Capital Cost Estimations.Frequency Converter 50Hz to 60Hz Fan Speed Controller Solar Power Inverter China, Montreal. vol.13. 166 pp.         [High Quality Printing Paper Button Badge Gift Promotional Customized Plastic]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.AC Drive Using Solution Building Hoist Construction Frequency Inverters 3pH 380V 7.5kw.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Android 6.0 Smart TV Box Rk3229 Quad-Core 2GB/8GB Internet Set Top]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Strong Corrosion Resistance High Overload Pressure Sensor10 Inch KTV System WooferCorresponding author

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