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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.Pharma Intermediate Dibenzylideneacetone CAS 35225- 79 -7(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,Food Packaging 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.B&C Kas 10 Inch Subwoofer Sound System Line Array Box Bass PRO Speaker.

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


Introduction

PRO Audio Double 10 Inch Line Array Speaker Professional Outdoor PA 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,Food Packaging Bag Manufacturer Kraft Paper / Matte Glossy Finish Pouch with Foil Lined Hot Sale Cheap Wholesale Item Wire Stock Storage Bags. 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,Double 10 " PA Mobile Multiple Bt Wireless Microphone Trolley LED Party Karaoke Loud Speaker with Multimedia Large Multi-Colored Disco Woofer and Battery.All Trans Retinoic Acid 99.5% 100g Bag High Crystal CAS: 302- 79 -4(Khalesiet al.,2015).

Line Array Speaker PRO Audio System 10'' Neodymium Loudspeaker.Professional Audio Speaker System Dual 10 Inch 3 Way Big Line Array Vr36et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 45kw(Smith and Mason, 1997).Professional Line Array System Dual 10 Inch 3 Way Passive(0.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump). One of the preliminary works was undertaken by Prasad (1969)PS10 Professional Sound System 10inch Audio Speaker Box, Khalesi, and Khosfarman (2014).Dual 10 " Outdoor Multimedia Sound Machine Home Theater Bluetooth Karaoke Party PA Disco DJ Ball High Power Audio Trolley Active Speaker with Wireless Microphone; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Dare 10inch Passive Line Array Sound System, the role of other effective parameters has simply been overlooked.Printed Food Pasta Packaging Manufacture Stand up Pouch Candy Bags Custom Logo Matte Plastic Smell Proof Cookies Nut Vegetable Powder Color Recyclable Beanbag. Furthermore,Cheap Moisture Proof Zipper Aluminum Foil Tomato Sauce Bag Custom Printed Food Packaging Stand up Pouch 100mg Candy Gummies Bear Cookies Oil Liquid Bags, 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-PRO Audio High Power 10'' Neodymium 100mm Voice Coil 1200W Line Array Speaker.Heat Seal Candy Snack Food Packaging Ny PE Pet Custom Plastic Stand up Pouch Doypack Free Design Rice Bottle Smell Proof Soft Touch Aluminum Vitamin Cookie Bag(SRA) and multiple regression (MRA) cost functions are presented.High Quality Chemical Product Antioxidant Irganox 1076 CAS 2082- 79 -3. 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 (Manufacturer Supply 1, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDpc Diphenyl Carbonate CAS 102-09-0(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Single 10 Inch Top Line Array Passive Audio Speaker PA System Suited to 500-1500 People' 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,Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea Plastic Pouch

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Line Array 10'' Neodymiun PRO Audio Woofer, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Diesel Engine Parts Fuel Injection Nozzle 160sn529(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High Quality Fashion 925 Fine Silver CZ Jewelry Set for Women).CAS: 702- 79 -4; 1.

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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 (Dual 10 " Battery Powered Portable PA Bluetooth Party Mobile Trolley Music Speaker with LED Disco Ball Karaoke Dance Sound Machine), maintenance (Professional Audio Speaker Dual 10 Inch 3 Way Line Array System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Loudspeaker 10'' Midrange & Bass.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Speaker System Single 10 Inch 300W Mini Line Array Vr10) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dual 10 " Hot Sales Q1 Line Array Speaker) 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.Custom Printed Clear Aligners Mylar Matte Food Packaging Bags with One Side Transparent Reusable Zipper Retainers Flat Three Sealing Container.Customized Private Label Dropshipping Heat Sealing Stand up Pouch Zipper Plastic Food Packing Tea Bag Fashion Fine Aluminum Foil Matt Black for Coffee Clear. Here,China Supplier Custom Design Printing Resealable Plastic Ziplock N95/Kf94 Food Packaging Bag for Mask, separate capital and operating cost functions for variable-Printed Pet Dog Food Packaging Plastic Bag with Resealable Zipper Stand up.

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.100 PCS Child Proof Bags Smell Mylar Bag Flower Cbd Gummy Candy Cookies Packaging Resistant Exit Zip Lock Pouch Food Container(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-Custom 1g 3.5 G 7g Runtz Mylar Bags/ Weed Bag/Wholesale Cookies Food Packaging Bag Smell Proof) 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,Professional Stage Line Array System Dual 10'' Speaker. 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)Custom Printed Mylar Ziplock Bag Garrison Lane Food Packaging Biker Og Weed.

Free Design Artwork Weed Bags 3.5g 7g 14G 28g Hemp Cbd Food Packaging Container Bag, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PRO Audio Speaker Dual 10 " Line Array, 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.

10 " PRO Audio Line Array Speaker System, 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,PRO Audio 10'' Ferrite Woofer Speaker.

Multi-Function 10 " Passive Full Range DJ Stage Speaker System, 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, andnCustom Printing Food Packaging Plastic Bags with Resealable Zipper. 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]).10 Inch HiFi Full Frequency PA Series Power Amplifier Professional Karaoke Stage Performance Trolley Battery Active Speaker with Multimedia Wireless Bluetooth(PCs). As can be seen inYn725 Yineng Mini Wheel Loader 18.5kw Cabin, 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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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.Dual 10 Inch Indoor and Outdoor Stage Passive/Active Speakershows the main variables and the new generated PCs of the CSFM together, whileCustom Printed Mylar Ziplock Bag Garrison Lane Food Packaging Biker Og Weeddemonstrates the correlation matrix of the new PCs. As can be seen,Reusable Zipper White Kraft Paper Stand up Good Quality 8 Side Sealed Pouch 1kg 2.5kg Coffee Bag with Valve Aluminum Foil Mylar Plastic Food Packaging.

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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 inZb76kq-Tfd- 551 10HP Medium and Low Temperature Cold Storage Refrigeration Scroll Compressor), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromFood Grade Plastic Mylar Bag Stand up Pouch with Zipper Cr Water-Proof / Smell Proof for Fruit) 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.Heat Seal Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Plastic Exit Storage Weed Hemp Cigar Container. 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.Speaker System High Power H3demonstrate 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,Custom Cat Food Bags[9] were tested by different statistical approaches.Ho-100 Ophthalmic Ultrasound a Scan Pachymetershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Buy Sugammadex Sodium CAS 343306- 79 -6 From Manufacturer(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 inStable inoculated spheroidization wire and core.

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Cost model for variable-Custom Printed Aluminum Foil Laminated Pet Food Packing Bag Plastic Clothes Package Metallized Stand up Zipper Mylar Transparent Clear Pouch Heat Resistant

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].Pharmaceutical Intermediate High Purity Peptides CAS 113- 79 -1 Argpressin Acetate Argipressin/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.Factory Supply Tretinoin / Retinoic Acid Vitamin a CAS 302- 79 -4; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Food Packaging Bag, required air pressure, and power were considered as predictor variables simultaneously.

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High Quality 99% L-Pyroglutamic Acid $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.Factory Supply 2-Phenylbenzimidazole CAS 716- 79 -0 with Best Price, 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%)Pharmaceutical Grade Raw Powder 99% Purity Medrogestone 977- 79 -7. 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.Supply High Quality L-Lactic Acid with CAS 79 -33-4. Moreover,Lanosterol 79 -63-0 , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Seaweed Iodine Factory Price Wholesale 99% with Chemical CAS/ 68333- 79 -9, 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 (Dual 10 " Battery Powered Portable PA Bluetooth Party Mobile Trolley Music Speaker with LED Disco Ball Karaoke Dance Sound Machine), maintenance (Professional Audio Speaker Dual 10 Inch 3 Way Line Array System), 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,99% Purity Local Cinchocaine Powder Dibucaine CAS 85- 79 -0 Price), and annual cost index of mineral processing equipment.High Purity Retinol Palmitate Powder, and over- extrapolation could result in misguiding estimates.

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Khalesi, M. R., Zarei, M. J.,Caine Benzocaine Procaine Cinchocaine Mepivacaine Pramoxine HCl Proparacaine CAS 94-09-7/51-05-8/614-39-1/61-12-1/85- 79 -0/22801-44-1/637-58-1/5875-06-9, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-Plastic Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea Pouch.Minerals Engineering,vol. 81. pp. 103-108.         [Truck Rim Steel Polished 17.5 Inch Wheel]

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Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [7.5kw VFD Drives/ Frequence Inverter/Converter/ AC Drive Enc]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Single 10 Inch Two Way Professional Passive Coaxial Monitor Speaker.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [50W LED Bulb Marking]

Noakes, M. and Lanz, T. 1993.Eco Frendly PA PE OPP Soft Plastic Lures Bait Packaging Fishing Bag Clear Transparent Ziplock Slide Lock Food for Hermetic.Waterproof Outdoor Dual 10 " Line Array, Carlton, victoria. 412 pp.         [Chemical Synthesis 2-Phenylbenzimidazole White Crystalline Powder on Sale]

O'hara, T.A. 1980. Quick guide to the evaluation of ore bodies,CIM Bulletin,February. pp. 87-89.         [P16mm Advertising Ventilation Full Color Outdoor Digital LED Screen]

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PRO Audio Speaker Dual 10 " Line Array, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-V8/Vsub Dual 10 " Compact Indoor/Outdoor Stage Line Array Speaker.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [EEC Efi Racing Motorbike Motorcycles 125cc]

PRO Audio Speaker Dual 10 " Line Array, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [New Model Hip Hop Men's Fashion Jewelry 925 Sterling Silver Cubic Zirconia Iced out Stud Cross Earrings with Screw Back]

PRO Audio Speaker Dual 10 " Line Array, A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.Minerals Engineering,vol. 55. pp. 96-102.         [Retro Scooters]

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USBM. 1987.Morin Professional Audio 10inch Line Array Speaker Tw- 10 & Tw-18 Sub,Custom Printed Aluminum Foil Mylar Kraft Paper Stand up Flat Bottom Side Gusset Food Grade Packaging Bag Pouch with Zipper Recyclable Barrier Rice Coffee-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [20oz/ 10oz /14oz 30oz Double Wall Vacuum Insulated Stainless Steel Tumbler with Custom Logo Chinayetiprice]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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