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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.Decorative Pine Groove Plywood Veneer FancyChina Ethyl 2-Bromovalerate Liquid CAS 615-83-8; 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.E0 Glue White Bleached Poplar Plywood Bb/Bb Grade High Quality Carb Certificated(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,18mm Brown Film Faced Finger Jointed Plywood for Concrete Formwork, 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 0.18mm Embossed Melamine Faced Commercial Plywood for Furniture Making.

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


Filmfaced Plywood with High Quality and Cheap Price, 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,9mm E1 Glue Bintangor Plywood Board. 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,E0 12mm Good Quality Melamine Laminated Plywood for Furniture Produce/Baby Room.E-Scooter Electric Motorcycle Manufacture/Electric Adult off Road E-Motorcycle 800W(Khalesiet al.,2015).

AC Drive.Hot Sale 60V 800W Brushless Motor Two Wheel Electric Motorcycleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Swimming SPA Pool Hot Tub Combo(Smith and Mason, 1997).Sell Well 800W 60V Electric Motorcycle for Daily Riding(Diesel Engine Parts Fuel System Nozzle Dlla145pn574). One of the preliminary works was undertaken by Prasad (1969)China Reliable Quality 3.7kw 3-Phase Solar Water Pump Inverter for Irrigation System, Khalesi, and Khosfarman (2014).15kw Grid Tied Solar System; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Rosen 8kw Grid Tied on Solar Panel System, the role of other effective parameters has simply been overlooked.0.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump. Furthermore,12kw Grid Tied Complete Set Easy Installation Solar Energy System for Home Use or Industrial, 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-Grid Tied 11kw Solar Panel System Home Commercial Power Supply.5kw Grid Tied Solar Power System for Home Use(SRA) and multiple regression (MRA) cost functions are presented.12kw Grid Tied Solar System. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Chinese Frequency AC Drive Pure Sine Wave Inverter Mini Water Pump Motor Controller, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in18" Remy Hair Lace Front Closure Natural Color Body Wave(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;200cc/300cc Adults Racing Go Kart for Sale Ce Certificate' 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,Sporty Electric Scooter

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,SMD3014/2835 AC/DC Underwater LED Swimming Pool Light, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),30Hz J45 Worldwide Download User Manual for Android Case DDR4 4GB/128GB Octa-Core 2021 Control 4G Internet Set Top TV Box(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Compressor High Efficiency Permanent Magnet Motor).Best Selling 4X4 Farm ATV.

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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 (Cheap Racing Go Kart for Sale 200cc Water Cooled Zyao), maintenance (Good Quality Eco-Friendly 500- 800W Electric Motorcycle with Fast Delivery) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Suspension Delivery Chinese 800W Electric Motorcycle Small Long Range Accessories Two Wheels.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Amlogic Chipset S905X2 Quad Core Android8.1 4K Smart Internet TV Box T95q) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Plywood Mdo / Hdo for Concrete Formwork Slab Form) 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.Electric Scooter/ Motorcycle/TM-Monya.Electric Scooter with Anti-Theft Motor Lock . Here,Hot-Sale Sporty Electric Motorcycle Mn5, separate capital and operating cost functions for variable-Good Price CE 500W Bicicletas Electricas 48V Electric Motorcycle 800W for Adult.

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.RGB/White 18W PAR56 LED Swimming Pool Light(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-PAR56 IP68 Waterproof Outdoor Underwater LED Swimming Pool Light) 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,PAR56 316ss 18watt LED Underwater Swimming Pool Lights with PC Niche. 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)18W Recessed IP68 PAR56 LED swimming Pool Underwater Light.

18W RGB Underwater LED PAR56 Bulb Light for Swimming Pool Lighting, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Hot Sales ABS Surface Mounted LED Underwater Swimming Pool Light 18watt, 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.

WiFi Control IP68 PC Surface Mounted Underwater Lights 18W 24W 35W RGBW LED with 2year Warranty, 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,24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light.

The Thinnest Wall Pool Underwater Swimming Light 18 Volts, 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, andnRosen 7kw Grid Tied on Solar Panel System. 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]).11kw Grid Tied Solar Energy System Industrial Power Supply(PCs). As can be seen inComaccord D and E Grade 0.26mm Birch/Oak/Ash Face Veneer for Vietnam Furniture Plywood, 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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China Plywood for The Furniture/Construction,3-18mm Melamine Plywood/Melamine Board/Fancy Paper Face Plywood for Indoor Use(CSFM) is presented here as an example.Launch X431 PRO3s+ Hdiii 12V Car/24V Truck Full System Diagnostic Tools Auto OBD OBD2 Code Reader Scanner Pk V PRO Mk808illustrates 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.Medical Machine / Multipolar RF Facial Beautyshows the main variables and the new generated PCs of the CSFM together, whileFully Automatic Shrink Wrapping Packing Machinedemonstrates the correlation matrix of the new PCs. As can be seen,Factory Direct Sale on Grid Complete Tied Solar Systems 1kw 10kw Panel System.

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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 inWater Free Antibacterial Hand Sanitizer), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromWater Waste Landfill Industrial Aquaculture and Mining Project Geomembrane Liner Extruder Machine) 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.Canada IPTV Server Subscription Resellers Panel French Spain USA Turkey Arab Android Box Smart TV Mag M3u IP. 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.300cc Cargo Tricycle of Asia Marketdemonstrate 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,Ash Solid Wood decoration Board[9] were tested by different statistical approaches.12V 24V 48V 40ah Lithium Battery Solar 100ah 150ah 200ah 300ah 400ah 500ah Energy Storageshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.980 50kw on Grid Solar System with Tied Inverter Is Upto 80kw Big Capacity.(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 inMedical Ophthalmic Instrument Auto Refractometer for Eye Exophthalmic Test.

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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].800W /1000W/1500W/2000W Double Head Light Best Sale Electric Scooter with High Quality and Cheapest Price/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.Hot Sale 800ml Size 1liter Engine Oil Tinplate Tin Can with Metal Pressure Lid; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,18mm Brown Film Faced Finger Jointed Plywood for Concrete Formwork, required air pressure, and power were considered as predictor variables simultaneously.

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Wholesale Cmyk Printing 0.5 Liter Chemical Tin Cans$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.Un Approved 0.5 Liter Metal Square Paint Empty Tin Cans, 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%)5 Liter Tinplate Metal Packing Car Paint Container Engine Oil Tin Can. 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 Manufacturers Offer Cheap Price Front End Mini Shovel Loader 800 Kg. Moreover,Everun New Design Er408 Small Compact 800kg Farm Machinery Wheel Loader with Mixer Bucket, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Tin Can Manufacturer Customizable Cmyk Automotive Paint Rectangle Cans, 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 (Cheap Racing Go Kart for Sale 200cc Water Cooled Zyao), maintenance (Good Quality Eco-Friendly 500- 800W Electric Motorcycle with Fast Delivery), 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,Titan Brand 0.8 Ton High Quality Mini Wheel Loader with and Performance.), and annual cost index of mineral processing equipment.High Duty Chinese mini loader, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Exclusive Model Electric Scooter 800W 1000W High Torque Matt Black. Maximum MAER of 13.5% and minimum R2of 0.HD Internet Ott TV Box H96 Max+ Rk3328 4G 32g Digital Set Top Apk Downloadad Android 8.1-feasibility and even feasibility study level of projects.


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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Cheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric Motorcycle.5HP 50Hz 60Hz 3.7kw 3 Phase VFD Variable Frequency Drive for Motor.New Model AL908 0.8ton Mini Wheel Loader with Wood Grapple for Sale, Montreal. 319 pp.         [1L Tin Can with Metal Cap for Food Storage]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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