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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

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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.Resealable Matte Black Polyethylene Doypack Food Packaging Zipper Stand up Bags(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,Doypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp Bag, 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 0.2-Way Speaker PS10 for High Quality Stage Monitor.

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


Introduction

Professional Line Array Speaker Single 10 Inch Full Range System, 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,Aluminium Foil Zip Lock Food Packaging Bag Manufacturer Plastic. 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,Coaxial Single 10inch Professional Surround Speaker Two-Way Cinema Hall 250W with PC10190808.96dB 250W AES Professional Full Range Two-Way Speaker Sinlge 10inch KTV Disco Occasion System with Ks10190902(Khalesiet al.,2015).

Professional Line Array System Single 10 Inch Neodymium Vr10.Samsung LTI550HN16 1920X1080P monitor LCD video wallet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Quality Rasagiline Mesylate API Powder CAS 161735- 79 -1 with Purity! !(Smith and Mason, 1997).Maunfacturing Price Sealed Food Packaging Vacuum Bag(3 Phase 11kw Speed Low Cost AC Variable Frequency Drive Inverter VFD Manufacturers for Electric Motor). One of the preliminary works was undertaken by Prasad (1969)Custom Printed Heat Seal Aluminum Plastic Cat Food Packaging Bag Child Resistant Mylar, Khalesi, and Khosfarman (2014).Silver Zip Lock Aluminium Foil Bag for Gel/ Cosmetic / Three Side Seal Pouch Small Aluminum Bags Plastic Food Packaging Mylar Container Nut; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Wholesale Colorful Customize Printing Food Grade Water Proof Skin Patches Small Aluminum Foil Packing Bags with Zip Lock, the role of other effective parameters has simply been overlooked.10'' Ferrite Woofer Best Price Loudspeaker. Furthermore,Android Advertising Player 46 Inch Ultra Thin Bezel LCD Video Wall LED Backlit E Paper Display, 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-Amazon Best Sell Custom Clears Silver Aluminum Foil Mylar Ziplock Stand up Pouch Bag.Vr36 Dual 10 Inch 3 Way Passive Compact Line Array(SRA) and multiple regression (MRA) cost functions are presented.Factory Supply Chlorhexidine Acetate/ Mpb Diacetate /CAS 206986- 79 -0. 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 (Heat Sealing Embossed Plastic Vacuum Packaging Bag for Delicatessen, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inLaswim Endless Pool/Counter Flow Pool(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Ceftriaxone Sodium 99% API CAS 104376- 79 -6 for Injection Grade' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Crovell Factory Supply High Quality CAS 79 -57-2 Oxytetracycline(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wholesale Washable Medical Equipment Face Mask Disposable Shield 3 Ply Soft Cotton Doctor Polypropylene Civil).Fast Delivery CAS 525- 79 -1 6-Furfurylaminopurine 99%.

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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 (Peptide Cosmetics CAS 155149- 79 -4 Capixyl), maintenance (China O-Phthalaldehyde Opa CAS 643- 79 -8 Raw Crystal 643798 Supplier) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,100% Copper Wire St-1kw Single Phase Dynamo Factory Price.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (China Supplier Antioxidants Powder of Propyl Gallate CAS: 121- 79 -9) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Display) 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.49" 450nits LG panel advertising LCD screen .aluminium LCD wall panel surveillance flat display. Here,3X3 LCD wall panel surveillance digital display screen, separate capital and operating cost functions for variable-AV input LCD wall panel 49inch surveillance monitors.

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.LG panel 49" advertising rack (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-55inch wall mount LCD panel surveillance LED video) 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,Two-Way 10inch Karaoke Full Range Speaker F10+ PA Horn. 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)55 Inch LCD Video Wall Display with Controller.

10inch Speaker for Music Bar PRO Audio Sound System, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (10inch Professional Karaoke Speaker for Luxury Room, 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.

Samsung 55inch 3X3 Digital Signage Display Screen 3.5mm Narrow Bezel, 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,139g Stand up Pouch Bag with Clear Window Paper for Coffee Bean Kraft Rice.

Local Anesthetic Cinchocaine CAS85- 79 -0 for Pain Killer, 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, andnProfessional Sound System 10'' PRO Neodymium Line Array PA Audio 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]).10inch Loudspeaker PA Speaker PRO Audio(PCs). As can be seen inCustom Plastic Coffee Flat Bottom Food Packaging with Ziplock Container, 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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10 Inch Powerful PRO Wood PA Bluetooth Audio Mixer Speaker,Single 10 Inch Active Speaker PS10r2 PA System(CSFM) is presented here as an example.China Energy Saving AC Water Pump Inverter 3pH Cabinet VFD with High Qualityillustrates 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.350-1500W 48-72V Smart Cheap Motorcycle for Adults Heavy Duty Electricshows the main variables and the new generated PCs of the CSFM together, whileYn725 Yineng Mini Wheel Loader 18.5kw Cabindemonstrates the correlation matrix of the new PCs. As can be seen,Professional Audio Speaker Dual 10 Inch Neodymium Line Array.

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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 in10m Length 1.4315 1.4948 1.4567 Mirror 8K 2b Polished Brushed Building Steel Materials Stainless Sheet for Kitchen Products Price), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Audio Speaker Double 10 Inch Line Array ) 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.Food Grade Packaging Custom Print Laminated Stand up Bag. 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.PC Epoxy Resin Filled Wall Mounted 12V AC 18W RGB Pool Light IP68 with Two Years Warrantydemonstrate 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,Whole Sale Custom Print and Different Color Food Packaging Stand up Pouch Bags with Zipper Window[9] were tested by different statistical approaches.Softel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHzshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Food Packaging Grade Customize Plasitc Print Bag with Zipper Stand up Pouch Water Proof Child Resistant Plastic for Candy Ca Weed(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 inCAS: 1326 -83-6 Dyestuff Sulphur Black Dye for Tie.

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Cost model for variable-Food Packaging Bag

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].High Quality Coffee /Candy/Weed /Hemp Plastic Container/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.Water Proof Child Coffee /Candy/Weed Plastic Container; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Doypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp Bag, required air pressure, and power were considered as predictor variables simultaneously.

10 Inch Coaxial Speaker Professional Driver " Line Array Subwoofer. Moreover, the operating cost was detailed in different cost items.Electronics ESD Moisture Barrier Aluminum Foil Bag Shielding Anti-Static Plastic for Electronic Parts, indicated in18mm Brown Film Faced Finger Jointed Plywood for Concrete Formwork, and major extrapolation should be avoided.

Donbn Dz- 10 Two Way Full Range Professional KTV Speaker$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.Professional Speaker Double 10'' Neodymium Line Array, 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%)10'' Neodymium Coaxial Speaker. 250W & 60W Power Rating PA Audio.. 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.4-Chloro-4'-Methylbenzophenone High Quality Products CAS 5395- 79 -9. Moreover,55" HD 1080P Commercial LED Screen Video Wall LCD Display, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (A+ grade LCD wall panel surveillance high brightness screen, 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 (Peptide Cosmetics CAS 155149- 79 -4 Capixyl), maintenance (China O-Phthalaldehyde Opa CAS 643- 79 -8 Raw Crystal 643798 Supplier), 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,Seamless 1920*1080 Pixel High Resolution LCD Monitor 49"), and annual cost index of mineral processing equipment.PA 10 -35W 5.25'' Sound Ceiling Speaker, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Samsung LTI550HN16 1920X1080P screen monitor LCD video wall. Maximum MAER of 13.5% and minimum R2of 0.46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Player-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Srx715 Single 15" Speaker Cabinet PRO Audio SystemLight Duty Hand Held Boiler Pipe Tube Cutter BevellerCorresponding author

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