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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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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

Carb /SGS Wood Fiber New Design 1220*2440mm Melamine MDFCost modelling for flotation machines

S. Arfania; A.R.Automatic Red Point Laser Marking Machine for Metal Aluminum Plastic5GHz 18dBi Dual Polarization Sector WiFi Antenna; 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.8mm Thickness 316ss IP68 RGB DC12V 18W External Control Mode LED Swimming Pool Light(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,IP68 8W-35W Surface Mounted Green Color LED Underwater Swimming Light, 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.IP68 8W-35W Surface Mounted Blue Color LED Underwater Swimming Light.

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


Introduction

150ah 3kwh Power Supply Deep Cycle Rechargeable Solar Battery, 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,8mm Thickness 160mm 8watt DC12V RGB LED Swimming Pool Underwater Light. 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,10W Tabletop Series Fiber Laser Marking Machine.Manufacturer 3kwh Long Life Solar Home System with LiFePO4 Battery(Khalesiet al.,2015).

Shrink Wrapping Machine for Water Packing .IP68 8W-42W Surface Mounted Multi-Color LED Underwater Swimming Lightet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Selling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price(Smith and Mason, 1997).3kwh Rechargeable Battery Solar Energy Power System(Lady's E-Scooter 800W Hot Sale Made in China). One of the preliminary works was undertaken by Prasad (1969)55% Rubber Content Tyre High Performance Diagonal Motorcycle Tires 200/55- 17, Khalesi, and Khosfarman (2014).DOT Certified Natural Rubber Motorcycle Tires 3.00- 17 with Golden Quality; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,55% Rubber Content Tyre China High Quality Motorcycle Tires 2.75- 17, the role of other effective parameters has simply been overlooked.Professional Factory Motorcycle Tyre and Motorbike . Furthermore,High Quality Motorcycle Parts Tyre , 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-Plastic Bottles Semi Automatic Film Shrink Wrapping Machine / Packing.High Speed Bottles Shrink Wrapping Machine/Group Packing Machine(SRA) and multiple regression (MRA) cost functions are presented.Can Beer Use Automatic PE Film Heat Shrink Wrapping Group Packaging Machine for Half Paper Box Juice Production Line. 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 (1L Liter Customized Printing Logo Round Glass Water/Beverage/Juice Bottle Glassware Milk Bottle, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Ce ISO SGS Certification Wd Series Full Automatic Linear Type PE Plastic Film Stretch Shrink Wrapping Machine Packaging' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Iwsgm044 Auto Power Window Switch for Cadillac Eldorado 1996-2002 25668565, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Mc4 Connector Combiner Box with 600V MCB for off Grid Solar System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Infrared 7 Color Mask Light Therapy Acne).Professional Manufacture Y Solar Mc4 Energy System Connector PV.

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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 (Electric Portable DOT Peen Vin Number Marking Machine for Flange Numbering), maintenance (Highly Quality 1500V Solar Mc4 Energy System Connector IP67 PV) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,24watt New RGB Cool White Warm LED Underwater Swimming Pool Light.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (1L High End Glass Vodka Wine Bottle with Matte Black Finish) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Mc4y Solar Connector) 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.1000V Solar Mc4 Energy System Connector IP67 PV.RF Wrinkle Removal Beauty Machine. Here,Thermal RF & Fractional Wrinkle Removal, separate capital and operating cost functions for variable-1L 2L 5L 10L 100ml 200ml 500ml Wine Glass Bottles.

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.Wrinkle Removal Super RF Beauty Machine(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-Glass Bottle 1L Empty 1000ml Milk) 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,Mc4y Tyco Solar Connector. 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)Mc4 Electronic Connector.

Empty Plastic Bottle 500ml / 1L /1000ml HDPE Trigger Pump Spray Bottles, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (1000ml 500ml 250ml Airtight Glass Water Juice Bottle with Clip Top 1L, 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.

1L 2L 5 L Plastic HDPE Powder Bottles, 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,Solar Tool Set/Bad/Box Cable Stripping Wire Cutter Mc4 Connector Spanner Wrench for PV System Panel 14-10AWG 2.5-6mm2.

30watt New RGB Cool White Warm LED Underwater Swimming Pool Light, 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, andnAll Terrain Vehicle Tyres ATV Wheel. 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]).1L Plastic Trigger Sprayer Bottle with Spray(PCs). As can be seen inCovered Tricycle Passenger Enclosed Cabin 3 Wheel Motorcycle, 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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20MHz RF Best Technology for Skin Tighten,Massage Lymphatic Drainage Body Shaping Slimming Beauty Apparatus(CSFM) is presented here as an example.VFD AC 380V 1.5kw Three Phase Inverter Frequency Converter Variable Driveillustrates 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.17.5-25 20.5-25 23.5-25 26.5-25 29.5-25 OTR Tire for Loadersshows the main variables and the new generated PCs of the CSFM together, whileSteel Wall Bracket for Speaker with Quick Release Pin demonstrates the correlation matrix of the new PCs. As can be seen,20MHz Thermal RF Wrinkle Removal Beauty Machine.

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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 in5 Way Universal Power Strip Overload Protection Socket), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from800W -1000W 60V/72V Electric Scooter with Lead-Acid Battery) 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.Color Changing Swimming Pool Lights. 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.Best Selling Electric Scooter Mini 800W demonstrate 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,Body Circumference Reduction RF Vacuum Fast Slimming System Beauty Apparatus[9] were tested by different statistical approaches.Jwell PLA Pet Plastic Biodegradable Sheet Recycling Cup Making Extrusion Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Underwater Pool Light with Niche (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 inSupply Small Sizes CE Approved Acrylic Bathtub for Adults.

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Cost model for variable-Skin Tightening

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].Globalipl RF Roller Vacuum Slimming Apparatus/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.portable Fiber Laser Marker Machine for Eyeglasses Case Accessories; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,IP68 8W-35W Surface Mounted Green Color LED Underwater Swimming Light, required air pressure, and power were considered as predictor variables simultaneously.

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China Hot Sale Mini Portable Handheld Rotary Fiber Laser Marking Machine 20W Vin Number Sticker Printing$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 0.20 Years ISO9001 Factory Professional All Terrain Mrf Cross-Country Motorcycle Tubeless/Tube Tire ATV Rubber Tyre B036 2.75-18 3.00-18, 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%)Motorcycle Spare Part Oil Switch for Gy6 150. 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.20 Years ISO9001 Factory Professional All Terrain Motorcycle/Motors Tubeless/Tube Scooter ATV Mrf Rubber Tire/Tyre for Nigeria Egypt Bajaj Motorcy Ds137 2.75- 17. Moreover,20 Years ISO9001 Factory Professional All Terrain Mrf Cross-Country Motorcycle Tubeless/Tube Tire ATV Rubber Tyre B036 2.75-18 3.00-18, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (DOT Peen Marking Machine Vin Touch Screen for Sale, 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 (Electric Portable DOT Peen Vin Number Marking Machine for Flange Numbering), maintenance (Highly Quality 1500V Solar Mc4 Energy System Connector IP67 PV), 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,Hand-Held Fiber Laser Marking Machine for Auto Parts/ Vin Numbers), and annual cost index of mineral processing equipment.Ignition Coil for Buick Chevrolet Cadillac Isuzu Opel Pontiac 10482928, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,ATV Scooter Motorcycle High Quality Parts. Maximum MAER of 13.5% and minimum R2of 0.New 110cc 125cc 150cc Mini Jeep Willys-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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