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



2-Aminoanthraquinone CAS No 117- 79 -3Cost modelling for flotation machines

S. Arfania; A.R.WiFi Probe Type 2 in 1 Double Head Wireless Mini Color Doppler UltrasoundElectric Industrial Induction Heater Manufacture in China for Sale ; 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.Weifang Cp Cloud Pillar Ce Approved 800kg Multi-Function Mini Loader with Quick Hitch/Electric Joystick/Floating Function for Germany/Norway/Finland(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,Aj-Bmd500 New Generation Ultrasound Bone Densitometer, 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 0.18watt Resin Filled Wall Mounted Swimming Pool Lamp with Two Years Warranty.

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


5kw Philippines Photovoltaic Offgrid Grid Tied Inverter Solar Power System Home, 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,Solar Power System 8kw Grid Tied Solution. 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,CE China manufacturers mini wheel loader for sale at cheap price.Wolf Agricultural Machinery Construction Small Front End Wheel Loader with Euro5 and Tier4 Engine(Khalesiet al.,2015).

China Portable Medical Ophthalmic a/B Ultrasound Scanner Pachymeter with B Probe for Eyes.6000W 200V-240V AC Single Phase on Gird/ Grid- Tied Solar Power Energy Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Samsung 55inch 3X3 Digital Signage Display Screen 3.5mm Narrow Bezel(Smith and Mason, 1997).Ce Approved 10 Inch Automatic High Effective Ultrasound Bone Densitometer (China Jiaxing Jarol Frequency Inverter 0.75kw/220V New). One of the preliminary works was undertaken by Prasad (1969)5GHz 10dBi Wideband Omni WLAN Antenna, Khalesi, and Khosfarman (2014).Jy125t-36c 125cc Scooter with Cdi and Efi; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,5GHz 18dBi Dual Polarized Panel Antenna , the role of other effective parameters has simply been overlooked.2021 New Arrival China Supplying Internet TV Set Top Box Smart 4K HD 4GB Android 9 Amlogic S922X. Furthermore,5GHz 23dBi Enclosure WLAN Antenna, 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-16" Inch Steel Wheel for Toyota Prado Land Cruiser.off Road 200cc Motorcycle for Hot Sale(SRA) and multiple regression (MRA) cost functions are presented.off Load 150cc Motorcycle with High Speed. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (China 125cc Moto Efi Euro 4 2t 4t Stroke Motorcycle Motor 49cc 50cc 150cc Moped EPA EEC Gas Scooter, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCPP High Temperature Vacuum Retort Pouch(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Al-Gw6 800W Electric Motorbike with 60V/20ah Battery' 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,Replica Aluminum Alloy Wheels for Volkswagen VW Tiguan Atlas Touareg

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Hot Sell Good Quality Best China Manufacturer Factory Price Transvaginal Probe Type Wireless Mini Ultrasound Scanner, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Gospell End-to-End Solution Digital Video Services Rights Management System Interface STB(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (P1.25mm Indoor Full Color LED Digital Display Screen).Medical Automatic Ultrasound Bone Densitometer in Low Price.

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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 (Yj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China), maintenance (Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,IN-A4CPL Portable Wireless WiFi ultrasound color doppler scanner machine.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Automatic High Effective Ultrasound Bone Densitometer Made in China) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Diesel Central Drive Three Wheel Dumper for Sale) 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.Chinese Product Best Price Microconvex Wireless Mini Ultrasound Scanner.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital. Here,Apr125 White Motorcycle, separate capital and operating cost functions for variable-Apr125 Red Motorcycle.

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.Apr125-2 White Motorcycle(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-Underwater Swimming Pool Light Decoration LED Lamp) 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,IN-AC5MC USB mobile scan cheapest pocket handheld hospital ultrasound scanner. 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)Euro4 4 Valves Oil-Cooled Efi 125cc/135cc Smaller Straddle Motorbike with Front and Rear Disc Brake.

350cc Motorcycle with Double-Cylinder & Water-Cooled Engine , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Popular Medical Device Automatic Bone Densitometer, 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.

Diesel Cargo Three Wheel Tricycle for Sale From China, 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,Diesel Dump Central Steering Drive Three Wheeler From China for Sale.

Chinese Diesel Three Wheel Tricycle with Sunshade, 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, andnOne and Half Rows Three Wheeler for Sale. 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]).Chinese Wholesale Gas Powered EPA Ce Trike Scooter 300cc(PCs). As can be seen inloader with excavator grapple wheel mini for sale good quality, 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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800W Electric Motorbike with Front Disc Brake,Hot Selling 60V 800W /72V 1200W New Electric Scooter/E-Scooter Motorcycle(CSFM) is presented here as an example.0.6m 5GHz Parabolic Antenna with Gain 28dBiillustrates 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.Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect Paintsshows the main variables and the new generated PCs of the CSFM together, whileHigh Power Two-Way Full Range PRO Audio Speaker Box Systemdemonstrates the correlation matrix of the new PCs. As can be seen,dB002e Hot Sell Electric Motorcycle 800W and Kids 500W with Ce for.

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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 inBest Selling RAM Module Desktop DDR3 4GB 8GB 1333 1600MHz Memoria for), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromNitrogen Chemical Fertilizer Ammonium Sulfate 21%Min) 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 0.800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycle. 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 Quality with Good Price Oxytetracycline HCl Powderdemonstrate 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,New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power[9] were tested by different statistical approaches.Gas Ski Adult PRO Electric Start Snow Scootershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.5GHz 30dBi Grid Parabolic Antenna (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 inCheap Price LED Backlight Smart TV 55 Inch 1920*1080P Full HD Super Slim Widescreen Television Support WiFi for Shopping.

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Cost model for variable-5GHz Dish Parabolic Antenna 29dBi

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].2.4/ 5GHz Dual Band H-Pol Sector Antenna/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.Electric Dirt Bike Zm-Es18 with 500W- 800W Motor; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Aj-Bmd500 New Generation Ultrasound Bone Densitometer, required air pressure, and power were considered as predictor variables simultaneously.

5GHz 20dBi Enclosure WLAN Antenna. Moreover, the operating cost was detailed in different cost items.5GHz 45deg Dual Pol Sector Antenna, indicated in3HP Frequency Converter Vector Three Phase, and major extrapolation should be avoided.

5GHz 23dBi Enclosure WiFi Antenna$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 0.5GHz Dual Pol Sector Antenna with Enclosure , 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%)5GHz 34dBi Dish WLAN Antenna. 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.5GHz 18dBi Dual Polarization Sector WiFi Antenna. Moreover,18W RGB Resin Filled LED Surface Mounted Underwater Pool Light, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Poplar Film Faced Plywood Board with Carb Certificate, 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 (Yj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China), maintenance (Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner), 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,18W 12V IP68 Waterproof LED Swimming Pool Lamps), and annual cost index of mineral processing equipment.Hot Sale on-Grid 20kw Grid Tied Solar Power Home System, and over- extrapolation could result in misguiding estimates.

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Camm, T.W. 1994.Quality 18mm Carb Birch Okoumen Plywood.Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale,vol. 46, no.6. pp. 559-562.         [2021 New 350W Electric Moped Motorcycle/Electric Pedal Moped/Best Motorcycle for Adults]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Chinese Cheap 1000W 2 Wheel Mobility Scooter Electrical Moped Motorcycle for AdultBuy Real Pharmaceutical Intermediates Pmk Glycidate Powder 13605-48-6Corresponding author

Creative Commons LicenseÂAll the contents of this journal, except where otherwise noted, is licensed under aModern Design Rk3318 Android 4GB RAM 32GB ROM HK1 Cool Free Internet Octa Core 9.0 Set Top TV Box