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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.8 Sides Sealed Aluminum Foil Bag Thickened Dog Food Packaging Tea Stand up Plastic Mylar Heat /Air/Water Resistant Container(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,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, 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.Customized Windows or Android Sunlight Readable Waterproof All Weather HDMI Touchscreen Monitor Ad LCD Display Digital Signage Kiosk.

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


Introduction

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, 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,Custom Cat Food 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,Buy Sugammadex Sodium CAS 343306- 79 -6 From Manufacturer.Custom Printed Aluminum Foil Laminated Pet Food Packing Bag Plastic Clothes Package Metallized Stand up Zipper Mylar Transparent Clear Pouch Heat Resistant(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (High Purity Retinol Palmitate Powder, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSolar Energy System 5kw Panel Home Grid Tied Power(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Hot Sale Dual 10 " Speaker PRO Audio ' 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,Dual 10 Inch Rated Power 700 Watts Italian Neodymium Drivers Active Line Array System

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,High Purity and Good Price Glycolic Acid , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),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(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Home Monitoring Security System Wireless Mini IP Cameras).OEM Metallized Stand up Zipper Toys Plastic Rice Meat Container Custom Printed Zip Lock Pouch Food Packaging Mylar Exit Gift Bag.

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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 (10 Inch Powered PA Speaker Full Range Stereo System), maintenance (Wholesale Matelized Bottom Gusset Stand up Barrier Exit Zipper Food Packaging Mylar Bag Custom Printing Colorful Aluminum Foil Laminated Plastic Container) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Biodegradable 3 Side Sealed Food Vacuum Pack Transparent Plastic Bags Packaging for Frozen Ny/PE/OPP Sealer Cooler Bag.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (3X3 video wall LCD HD 1080P digital display screen) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Food Saver High Transparent Vacuum Plastic Bag) 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.Cvr 2021 New 10'' Line Array Professional.10'' Red Steel Woofer. Here,Single 10 Inch Two Way Professional Passive Coaxial Monitor Speaker, separate capital and operating cost functions for variable-Eco Frendly PA PE OPP Soft Plastic Lures Bait Packaging Fishing Bag Clear Transparent Ziplock Slide Lock Food for Hermetic.

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.Waterproof Outdoor Dual 10 " Line Array(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-Aluminum Foil Self Sealing Digital Plastic Packaging Bag Glossy Holographic Stand up Clear Front Laser Film Food with Zipper) 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,Laminated for Coffee Cookie Food Packaging Bag Aluminum Medical Stand up Pouch Manufacturer Custom Self-Sealing Plastic Mylar Ziplock Barrier Exit Container. 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)PRO Audio Powered Line Array Tw- 10 Outdoor Speaker.

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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.

V8/Vsub Dual 10 " Compact Indoor/Outdoor Stage Line Array Speaker, 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,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, 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, andnManufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Coffee Bean Three-Side Sealed Mylar Chocolate. 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]).Professional Speaker System Dual 10 Inch Three Way Line Array Audio V310(PCs). As can be seen in50W LED Bulb Marking, 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.2021 Hot Sale Switch Control 12V 18W RGB Wall Mounted LED Swimming Pool Light Underwatershows the main variables and the new generated PCs of the CSFM together, whileModern City Leisure Electric Scooter Motorcycle with Lithium Battery demonstrates the correlation matrix of the new PCs. As can be seen,LG LD490DUN-TJB2 LCD wall mount video with 2X2 panel.

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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 inCustom Make Kids Novelty Cute Chicken Sheep Penguin Fox Cartoon Toys Plastic Animal), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromGlossy & Matte Plastic Flat Bag Three Side Sealing Aluminum Foil with Tear Notch &Ziplock Silver Food Packaging Pouch for Food&Hemp&Tea Smell Resistant) 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 0.1.8mm ultra narrow bezel 16: 9 LED TV video wall for home. 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.Portable Wireless Professional Rechargeable DJ Karaoke Sound Box Bluetooth PA Speaker with Wire Microphone 1PCSdemonstrate 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,wall mount 16: 9 LCD screen video for big project[9] were tested by different statistical approaches.Australia Modern Home Furniture Living Room Leather Sofa Couch Fp-Fs450shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.aluminium video wall LCD HD 1080P flat panel display(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 in3 Round Pin Combo Switch and Socket 56CV332 for Australia Standard.

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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].Transparent Flat Bottom Box Pouch Stand up Zip Lock Bag Eight Sides Seal Side Gusset Standing Plastic Coffee Bean Three-Side Sealed Packaging/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.Transparent Flat Bottom Box Pouch Stand up Zip Lock Eight Sides Seal Bag Side Gusset Standing Plastic Clear Coffee Bags Manufacturer Reusable PE Pet Food; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,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, required air pressure, and power were considered as predictor variables simultaneously.

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Prfessional Audio 10''karaoke Loudspeaker$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 0.10 Inch KTV System Woofer, 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%)Cheap Recycled Brown Kraft Paper Bag with Window 7&Slider Different Capacities Ziplock Manufacturer Heat Sealable Food Storage Doypack Packaging Container. 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.Laminated Food Packaging Bag Aluminum Coffee Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Barrier Bean Container. Moreover,10 Inch Compact Line Array PRO Audio, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (10 Inch Indoor Outdoor Professional Loudspeaker, 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 (10 Inch Powered PA Speaker Full Range Stereo System), maintenance (Wholesale Matelized Bottom Gusset Stand up Barrier Exit Zipper Food Packaging Mylar Bag Custom Printing Colorful Aluminum Foil Laminated Plastic Container), 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% Assay High Purity Miriplatin Pharmaceutical Chemical Powder with 141977- 79 -9), and annual cost index of mineral processing equipment.Double 10inch Line Array Speaker Q1+Q Sub with Neodymium Magnet, and over- extrapolation could result in misguiding estimates.

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Khalesi, M. R., Zarei, M. J.,100 PCS High Quality Resealable Hair Top Wig Clear Transparent Ziplock Bag Plastic Food Packaging for Oil, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-Thiosemicarbazide CAS 79 -19-6.Minerals Engineering,vol. 81. pp. 103-108.         [Hot Good Bulk Quality 60V800W20ah Electric Motor Scooter for Ladies]

Kim, G.H., An, S.H., and Kang, K.I. 2004.O-Phthalaldehyde CAS 643- 79 -8, neural networks, and case-based reasoning.Building and Environment,vol. 39, no. 10. pp. 1235-1242.         [12 Inch Audio Wireless Professional Portable Rechargeable DJ Bluetooth PA Trolley Speaker with LED Light ED-1201 Wire Microphone 1PCS]

Lashgari, A.High Purity CAS 71277- 79 -7 Licorice Extract Disodium Glycyrrhizinate with Nice Price, A.R. 2013.PRO Audio 2-Way Dual 10inch Line Array System Q1+Q Sub,Pharmaceutical Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory Painkillers,vol. 23. pp. 441-446.         [Factory OEM Low Consumption impact crusher PF1010 with cheap price]

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Mular, A.L. 1982.High Purity CAS 64318- 79 -2 Gemeprost.Ziplock Dog Food Bag with Bottom Gusset.High Quality Glycolic Acid/ Hydroxyacetic Acid CAS 79 -14-1, Montreal. 265 pp.         [Whole Sale Home Antique Style Large Acrylic Freestanding Bathtub]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Custom Printed Food Grade Ziplock Packing Bag.Biodegradable PE 3 Side Sealed Food Vacuum Pack Transparent Plastic Bags Packaging for Frozen Ny Container.High Quality Glycolic Acid/ Hydroxyacetic Acid CAS 79 -14-1, Montreal. 319 pp.         [Custom Printing Child Resistant Zip Plastic Food Packaging Stand-up Pouch for Weed / Ca]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Laminated for Coffee Foil Cookie Food Packaging Bag Aluminum Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Container.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5]

Noakes, M. and Lanz, T. 1993.Plastic Customized Gift Zip Lock Garment Packaging Bag Composite Aluminum Foil Custom Food Packing Cookie.Self Sealing Bags Heat Aluminum Foil Food Packaging Zipper Custom Printed Mylar Bag, Carlton, victoria. 412 pp.         [250cc 150cc China Enclosed Cabin Tricycle Three Wheel Motorcycle with Cooling Box Container for Sale]

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Pascoe, R.D. 1992. Capital and operating costs of minerals engineering plants:Two Way 10 " Mini Portable PRO Audio Active Loudspeaker PS10.Minerals Engineering,vol. 5, no. 8. pp. 883-893.         [Pneumtic Forklift Tyre/Industrial Tyre/NHS Tyre ]

Prasad, L. 1969.Outdoors Professional/PRO Audio Speaker .Dual 10 " Two Way PA Power Line Array Speaker, Metallurgy and Petroleum, Montreal. pp. 3-15.         [Manufacturer of Rectangular Brake Oil Motor Engine Tin Can]

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Manufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Mylar Recyclable Heat Sealed Coffee Bean Rice Dough Powder, A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.Minerals Engineering,vol. 55. pp. 96-102.         [2021 New Machine Grade CO2 Laser Marking with a Discount]

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Timm, N.H. 2002. Applied Multivariate Analysis. Springer-Verlag, New York.         [High Quality Footbath Sofa / Foot Massage]

USBM. 1987.Single 10'' Two Way Line Array PRO Audio,Double 10 Inch Line Array PRO Audio -metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Manual diaphragm hygienary valve]

Wills, B.A. and Napier-Munn, T. 2011. Wills' Mineral Processing Technology: An Introduction to the Practical Aspects of Ore Treatment and Mineral Recovery. 7th edn. Elsevier/Butterworth Heinemann, Amsterdam.         [Deltamethrin 2.5% Wp of Insecticide Pesticide]

Paper received Apr. 2015
Revised paper Received Jul. 2016

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