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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
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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

Cheap Commercial Plywood for Construction Decoration and Furniture UseCost modelling for flotation machines

S. Arfania; A.R.Pharmaceutical Raw Powder Diclofenac Sodium CAS 15307- 79 -6 for Anti-InflammatoryHot Sale 301 401 Easy Opening Seal Can Round Empty Tin with Metal Caps; 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.Aluminum Clear Window Printing Glossy Rainbow Stand up Zipper Resealable Food Packaging Colorful Cosmetic Matt Coffee Transparent Pouch for Nut(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,High Quality Oxytetracycline Powder 100% CAS 79 -57-2, 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.CAS: 79 -44-7; Dimethylcarbamoyl Chloride;.

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


Introduction

Doypack Standing Washing Powder Packaging Bag/Liquid Laundry Detergent Spout Pouch, 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,200X5000mm Vacuum Sealer Bag Roll for Food Packaging. 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,Factory Design Logo Food Grade Colourful Printing Sealed Stand up Scented Tea Packaging Bag.Waterproof Plastic Cookies Biscuit Zip Packaging Bag with Window Upright Ziplock Laminated Mylar Food Material Underwear Air Hole(Khalesiet al.,2015).

Pet/PE/CPP Ziplock Plastic Clear Nut Package Dry Food Grade Bags.Hot Sales 2/3 Sides Seal Food Vacuum Pouches 70micronet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Apr125-2 White Motorcycle(Smith and Mason, 1997).Heat Seal Moisture Proof Cbd Gummies Plastic Food Packaging Candy Bag(Dual 10 Inch Line Array for Concert Live Service ). One of the preliminary works was undertaken by Prasad (1969)Professional Speaker System Single 10 Inch 300W Mini Stage Monitor PS10r2, Khalesi, and Khosfarman (2014).Professional Sound Speaker System Single 10 Inch Mini Passive Line Array Vr10; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Professional Audio Speaker Single 10 Inch 300W Portable Stage Monitor PS10r2, the role of other effective parameters has simply been overlooked.D&B Q1 Style Dual 10 Inch Professional Speaker . Furthermore,Professional Audio Speaker System Single 10 Inch Portable Mini Line Array Vr10, 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-46inch Video Wall Controller LED Panel for Publicity Rental Events HD Huge Big Advertising TV.10'' Neodymium Woofer Professional Loudspeaker with Brown Cone.(SRA) and multiple regression (MRA) cost functions are presented.PA 10 -25W 4 Inch Sound Ceiling Speaker. 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 (Runtz Packaging Mylar Ziplock Food Grade Plastic Zip Lock Bags Stand up Pouch Pet Custom Logo Bag, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCommercial Solar System 100kw Grid Tied /on 100kVA 60kw(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Aluminum Foil Plastic Papacking Vacuum Puffed Food Bag' 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,Kraft Paper &Plastic Foil Laminated Mylar Food Packaging Container

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 Inch Active Stage Monitor PA Audio Speaker System for Line Array Subwoofer Live Show , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Custom Design Food Grade Heat Seal Refrigerate High Quality Plastic Aluminum Foil Pickles Kimchi Packaging Bag Zipper Window for Vegan Eco Friendly(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Metal Restaurant Decorative Crystal Luxury Chandeliers Pendant Lights).Bloom Tech Chemical Reagent .

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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 (BPA Free Customize Printing Plastic Laminated Mylar Bio Bag with Ziplock), maintenance (Active Pharmaceutical Ingredient CAS 15307- 79 -6 Diclofenac Sodium) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hair and Eyelash Growth Acetyl Tetrapeptide-3/Capixyl CAS 155149- 79 -4.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Quality Printed Food Packaging Doypack Aluminium Zipper Bags) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Quality Argipressine CAS 113- 79 -1 with Best Price) 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.1-Bromo-3.Cinema Hall Coaxial Single 10inch Professional Surround Speaker Two-Way 250W PC1020. Here,Sourcing O-Phthalaldehyde Opa CAS 643- 79 -8 in Stock Supplier From China, separate capital and operating cost functions for variable-55 Inch Stand Alone Digital Free Standing LCD Advertising Display.

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.Top Selling 1(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-Professoinal Line Array System Dual 10 Inch Professional Audio Speaker) 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,Dual 10 " Compact Speaker Line Array . 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 High Quality N-Cbz-D-Leucine Powder CAS. 28862- 79 -5 99% Purity.

Factory Supply Tretinoin / Retinoic Acid Vitamin a 302- 79 -4, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Economic Mulifunctional Line Array System Speaker Dual 10 Inch, 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.

Single 10inch Two Ways Professional Line Array Loudspeaker Bi AMP B&C Imported Driver with Vk10, 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,Professional Loudspeaker 10'' Neodymium Magnet.

Kas PRO Top 10inch Line Array Audio Speaker, 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, andnRetionoic Acid API USP Tretinoin Good Quality Competitive Price CAS No 302- 79 -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]).Dexketoprofen Trometamol Manufacturer CAS 156604- 79 -4 with Purity 99%(PCs). As can be seen in800W 60V20ah Lead-Acid Battery Electric Scooter 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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LG 46" 49" 55" DVI LED video panel for monitoring,Retinoic Acid CAS No. 302- 79 -4(CSFM) is presented here as an example.HK1 S905W 2g 16g 7.1 Android TV Box of New Product Set Top with Low Price Kd Player 17.0illustrates 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.Pigmentshows the main variables and the new generated PCs of the CSFM together, while2021 Hot Sale Light Source Be Glued IP68 LED Underwater for Swimming Pooldemonstrates the correlation matrix of the new PCs. As can be seen,Customized Printed 3.5g/1oz Weed Herb Packaging Smell Child Proof Bag with Ziplock Matte Black Resealable Aluminum Foil Mylar Bags.

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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 inEU Fr It Standard Wireless WiFi Smart Socket with APP/Voice Control for Home), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromWspvcc Solar PV Connector Mc4 High Effiency IP 67) 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.Doypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp 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.Motorcycle Tires/Motorcycle Tyre/Tire 2.50- 17 2.50-18 2.75- 2.75-18demonstrate 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,2-Way Speaker PS10 for High Quality Stage Monitor[9] were tested by different statistical approaches.Replica Aluminum Alloy Wheels for BMW 1/2/3/4/5/6/7 Seriesshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Professional Line Array Speaker Single 10 Inch Full Range System(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 inFashion Hip Hop Jewelry Sterling Silver 14K Gold Plated Cubic Zirconia Iced out Ring for Wholesale.

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Cost model for variable-Aluminium Foil Zip Lock Food Packaging Bag Manufacturer Plastic

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].Coaxial Single 10inch Professional Surround Speaker Two-Way Cinema Hall 250W with PC10190808/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.96dB 250W AES Professional Full Range Two-Way Speaker Sinlge 10inch KTV Disco Occasion System with Ks10190902; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality Oxytetracycline Powder 100% CAS 79 -57-2, required air pressure, and power were considered as predictor variables simultaneously.

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Maunfacturing Price Sealed Food Packaging Vacuum Bag$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.Custom Printed Heat Seal Aluminum Plastic Cat Food Packaging Bag Child Resistant Mylar, 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%)Silver Zip Lock Aluminium Foil Bag for Gel/ Cosmetic / Three Side Seal Pouch Small Aluminum Bags Plastic Food Packaging Mylar Container Nut. 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.Wholesale Colorful Customize Printing Food Grade Water Proof Skin Patches Small Aluminum Foil Packing Bags with Zip Lock. Moreover,10'' Ferrite Woofer Best Price Loudspeaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Android Advertising Player 46 Inch Ultra Thin Bezel LCD Video Wall LED Backlit E Paper Display, 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 (BPA Free Customize Printing Plastic Laminated Mylar Bio Bag with Ziplock), maintenance (Active Pharmaceutical Ingredient CAS 15307- 79 -6 Diclofenac Sodium), 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,Amazon Best Sell Custom Clears Silver Aluminum Foil Mylar Ziplock Stand up Pouch Bag), and annual cost index of mineral processing equipment.Vr36 Dual 10 Inch 3 Way Passive Compact Line Array, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Factory Supply Chlorhexidine Acetate/ Mpb Diacetate /CAS 206986- 79 -0. Maximum MAER of 13.5% and minimum R2of 0.Heat Sealing Embossed Plastic Vacuum Packaging Bag for Delicatessen-feasibility and even feasibility study level of projects.

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Kim, G.H., An, S.H., and Kang, K.I. 2004.Pharmaceutical Chemicals Cefodizime Sodium CAS 86329- 79 -5, neural networks, and case-based reasoning.Building and Environment,vol. 39, no. 10. pp. 1235-1242.         [Sanyou 125cc Efi System with Delivery Box Gas Scooter]

Lashgari, A.Hot Selling Ceftriaxone Sodium CAS 104376- 79 -6 Top Quality, A.R. 2013.99% High Quality Nootropics Drugs Huperzine a 102518- 79 -6 Hupa USA Factory Fast Delivery,Manufacturer Supply Poly L-Lactic Acid with Lowest Price Raw Material Bulk 79 -33-4 for Food Additives,vol. 23. pp. 441-446.         [PSE Power Cords& Electrical Outlets]

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Mular, A.L. 1982.Peptide Cosmetics CAS 155149- 79 -4 Capixyl.China O-Phthalaldehyde Opa CAS 643- 79 -8 Raw Crystal 643798 Supplier.100% Copper Wire St-1kw Single Phase Dynamo Factory Price, Montreal. 265 pp.         [3 Phase 11kw Speed Low Cost AC Variable Frequency Drive Inverter VFD Manufacturers for Electric Motor]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.China Supplier Antioxidants Powder of Propyl Gallate CAS: 121- 79 -9.37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Display.100% Copper Wire St-1kw Single Phase Dynamo Factory Price, Montreal. 319 pp.         [Laswim Endless Pool/Counter Flow Pool]

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Economic Mulifunctional Line Array System Speaker Dual 10 Inch, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-10inch Speaker for Music Bar PRO Audio Sound System.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Yn725 Yineng Mini Wheel Loader 18.5kw Cabin]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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