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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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High Quality Plastic Zipper #5 #3 for Garments

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

Custom Printed Mylar Ziplock Bag Garrison Lane Food Packaging Biker Og WeedCost modelling for flotation machines

S. Arfania; A.R.High Quality Chemical Product Antioxidant Irganox 1076 CAS 2082- 79 -3High Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker; 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.Manufacturer Supply 1(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,Single 10 Inch Top Line Array Passive Audio Speaker PA System Suited to 500-1500 People, 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 0.99% Glycolic Acid Powder CAS 79 -14-1.

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


Introduction

5f-Pcn CAS No. 1445579- 79 -2 in Stock, 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,Ortho Phthalaldehyde CAS 643- 79 -8 O-Phthalaldehyde. 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,Supply 99% Purity 3-Amino-4-Pyrazolecarboxamide Hemisulfate .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(Khalesiet al.,2015).

Line Array 10'' Neodymiun PRO Audio Woofer.Diesel Engine Parts Fuel Injection Nozzle 160sn529et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for China Best Quality 1500cc Amphibious Jet Ski Hot Selling in Europe(Smith and Mason, 1997).CAS: 702- 79 -4; 1(10HP Three Phase Frequency Converter). One of the preliminary works was undertaken by Prasad (1969)Dual 10 " Battery Powered Portable PA Bluetooth Party Mobile Trolley Music Speaker with LED Disco Ball Karaoke Dance Sound Machine, Khalesi, and Khosfarman (2014).Professional Audio Speaker Dual 10 Inch 3 Way Line Array System; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Loudspeaker 10'' Midrange & Bass, the role of other effective parameters has simply been overlooked.Professional Speaker System Single 10 Inch 300W Mini Line Array Vr10. Furthermore,Dual 10 " Hot Sales Q1 Line Array Speaker, 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-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(SRA) and multiple regression (MRA) cost functions are presented.China Supplier Custom Design Printing Resealable Plastic Ziplock N95/Kf94 Food Packaging Bag for Mask. 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 (Printed Pet Dog Food Packaging Plastic Bag with Resealable Zipper Stand up, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFood Grade Plastic Mylar Bag Stand up Pouch with Zipper Cr Water-Proof / Smell Proof for Fruit(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;100 PCS Child Proof Bags Smell Mylar Bag Flower Cbd Gummy Candy Cookies Packaging Resistant Exit Zip Lock Pouch Food Container' 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,PRO Audio Speaker Dual 10 " Line Array

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

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PRO Audio 10'' Ferrite Woofer Speaker(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (UL Ce SMD1210).Multi-Function 10 " Passive Full Range DJ Stage Speaker System.

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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 (Custom Printing Food Packaging Plastic Bags with Resealable Zipper), maintenance (10 Inch HiFi Full Frequency PA Series Power Amplifier Professional Karaoke Stage Performance Trolley Battery Active Speaker with Multimedia Wireless Bluetooth) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Karaoke Speaker 10'' Ferrite KTV Loudspeaker Portable for System..076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (100 PCS High Quality Resealable Hair Top Wig Clear Transparent Ziplock Bag Plastic Food Packaging for Oil) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (8 Sides Sealed Aluminum Foil Bag Thickened Dog Food Packaging Tea Stand up Plastic Mylar Heat /Air/Water Resistant Container) 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.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.Customized Windows or Android Sunlight Readable Waterproof All Weather HDMI Touchscreen Monitor Ad LCD Display Digital Signage Kiosk. Here,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, separate capital and operating cost functions for variable-Custom Cat Food Bags.

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.Buy Sugammadex Sodium CAS 343306- 79 -6 From Manufacturer(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 Printed Aluminum Foil Laminated Pet Food Packing Bag Plastic Clothes Package Metallized Stand up Zipper Mylar Transparent Clear Pouch Heat Resistant) 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,Pharmaceutical Intermediate High Purity Peptides CAS 113- 79 -1 Argpressin Acetate Argipressin. 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)Factory Supply Tretinoin / Retinoic Acid Vitamin a CAS 302- 79 -4.

Anti-Aging and Anti-Wrinkle Cosmetic Grade PRO-Xylane CAS-439685- 79 -7, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (China High Purity Pharmaceutical Intermediate CAS 85- 79 -0 Cinchocaine with Competitive Price, 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.

High Quality 99% L-Pyroglutamic Acid , 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,Factory Supply 2-Phenylbenzimidazole CAS 716- 79 -0 with Best Price.

Pharmaceutical Grade Raw Powder 99% Purity Medrogestone 977- 79 -7, 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, andnSupply High Quality L-Lactic Acid with CAS 79 -33-4. 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]).Lanosterol 79 -63-0 (PCs). As can be seen inSpeaker System High Power H3, 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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99% Purity Local Cinchocaine Powder Dibucaine CAS 85- 79 -0 Price,High Purity Retinol Palmitate Powder(CSFM) is presented here as an example.Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Diseaseillustrates 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.2507 Uns S32750 Duplex Stainless Steel Sheet / Plateshows the main variables and the new generated PCs of the CSFM together, whileYangtze 100kw Grid Tied Portable Solar System Camping Componentdemonstrates the correlation matrix of the new PCs. As can be seen,Hot Sale Dual 10 " Speaker PRO Audio .

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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 inCouleur Blanche Savon Antiseptique Santex Pour Une Peau Douce Et Saine), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from1L Printed Round Metal Paint Tin Can with Lid) 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.Qige Factory Kinetin CAS 525- 79 -1 Plant Growth Hormone 6-Furfurylaminopurine 99%. 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.1 Gallon Metal Can Clear Car Paint Square Empty Engine Oil Tin Cans Latasdemonstrate 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,China Factory Price Chlorhexidine Diacetate CAS 206986- 79 -0[9] were tested by different statistical approaches.99% Purity 1shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.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(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 inProtective Face Mask KN95 with Valve.

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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].High Purity and Good Price Glycolic Acid /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.Heat Seal Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea Pouch; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Single 10 Inch Top Line Array Passive Audio Speaker PA System Suited to 500-1500 People, required air pressure, and power were considered as predictor variables simultaneously.

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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.Food Saver High Transparent Vacuum Plastic Bag. Moreover,Cvr 2021 New 10'' Line Array Professional, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (10'' Red Steel Woofer, 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 (Custom Printing Food Packaging Plastic Bags with Resealable Zipper), maintenance (10 Inch HiFi Full Frequency PA Series Power Amplifier Professional Karaoke Stage Performance Trolley Battery Active Speaker with Multimedia Wireless Bluetooth), 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,Single 10 Inch Two Way Professional Passive Coaxial Monitor Speaker), and annual cost index of mineral processing equipment.Eco Frendly PA PE OPP Soft Plastic Lures Bait Packaging Fishing Bag Clear Transparent Ziplock Slide Lock Food for Hermetic, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Waterproof Outdoor Dual 10 " Line Array. Maximum MAER of 13.5% and minimum R2of 0.Aluminum Foil Self Sealing Digital Plastic Packaging Bag Glossy Holographic Stand up Clear Front Laser Film Food with Zipper-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.LG LD490DUN-TJB2 LCD wall mount video with 2X2 panel.High Quality Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price Acid Glycolic.49" VGA high performance monitor LCD video wall panel with extention cable, Montreal. 319 pp.         [2.8X1.9 Large Size Rotary Cut Okoume Face Veneer]

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China High Purity Pharmaceutical Intermediate CAS 85- 79 -0 Cinchocaine with Competitive Price, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Prfessional Audio 10''karaoke Loudspeaker.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Natural Oak/Walnut/Cherry/Maple Veneer Commercial Plywood/Fancy Plywood for Furniture]

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USBM. 1987.10 Inch KTV System Woofer,Cheap Recycled Brown Kraft Paper Bag with Window 7&Slider Different Capacities Ziplock Manufacturer Heat Sealable Food Storage Doypack Packaging Container-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Athen Jade Marble Slabs for Interior Flooring Wall Decoration]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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