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High Quality Personalized Custom Metal Zinc Alloy Logo Soft Enamel Sports Competition Championships Gold Lacrosse Medal for Winner
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
0.6mm----2mm AAA Grade White Poplar Wood Veneer for Plywood UsageCost modelling for flotation machines
S. Arfania; A.R.Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea Plastic Pouch150cc Gy6 Engine Gasoline Scooter; 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.Line Array 10'' Neodymiun PRO Audio Woofer(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,Diesel Engine Parts Fuel Injection Nozzle 160sn529, 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: 702- 79 -4; 1.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Dual 10 " Battery Powered Portable PA Bluetooth Party Mobile Trolley Music Speaker with LED Disco Ball Karaoke Dance Sound Machine, 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,Professional Audio Speaker Dual 10 Inch 3 Way Line Array System. 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,Loudspeaker 10'' Midrange & Bass.Professional Speaker System Single 10 Inch 300W Mini Line Array Vr10(Khalesiet al.,2015).
Dual 10 " Hot Sales Q1 Line Array Speaker.Custom Printed Clear Aligners Mylar Matte Food Packaging Bags with One Side Transparent Reusable Zipper Retainers Flat Three Sealing Containeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Proxima Entertainment S-320 Speaker(Smith and Mason, 1997).Customized Private Label Dropshipping Heat Sealing Stand up Pouch Zipper Plastic Food Packing Tea Bag Fashion Fine Aluminum Foil Matt Black for Coffee Clear(Three Wheel Motor Tricycle Rickshaw Rear Axle). One of the preliminary works was undertaken by Prasad (1969)China Supplier Custom Design Printing Resealable Plastic Ziplock N95/Kf94 Food Packaging Bag for Mask, Khalesi, and Khosfarman (2014).Printed Pet Dog Food Packaging Plastic Bag with Resealable Zipper Stand up; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,100 PCS Child Proof Bags Smell Mylar Bag Flower Cbd Gummy Candy Cookies Packaging Resistant Exit Zip Lock Pouch Food Container, the role of other effective parameters has simply been overlooked.Custom 1g 3.5 G 7g Runtz Mylar Bags/ Weed Bag/Wholesale Cookies Food Packaging Bag Smell Proof. Furthermore,Professional Stage Line Array System Dual 10'' 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 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(SRA) and multiple regression (MRA) cost functions are presented.PRO Audio Speaker Dual 10 " Line Array. 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 (10 " PRO Audio Line Array Speaker System, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inExperienced Supplier with Safe Clearance Fast Delivery BMK Glycidate Pmk(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PRO Audio 10'' Ferrite Woofer Speaker' 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,100 PCS High Quality Resealable Hair Top Wig Clear Transparent Ziplock Bag Plastic Food Packaging for Oil
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,8 Sides Sealed Aluminum Foil Bag Thickened Dog Food Packaging Tea Stand up Plastic Mylar Heat /Air/Water Resistant Container, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),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(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (24W AC DC Power Adapter with CE Certificate Supply).Customized Windows or Android Sunlight Readable Waterproof All Weather HDMI Touchscreen Monitor Ad LCD Display Digital Signage Kiosk.
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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 (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), maintenance (Custom Cat Food Bags) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Buy Sugammadex Sodium CAS 343306- 79 -6 From Manufacturer.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Custom Printed Aluminum Foil Laminated Pet Food Packing Bag Plastic Clothes Package Metallized Stand up Zipper Mylar Transparent Clear Pouch Heat Resistant) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Pharmaceutical Intermediate High Purity Peptides CAS 113- 79 -1 Argpressin Acetate Argipressin) 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.Factory Supply Tretinoin / Retinoic Acid Vitamin a CAS 302- 79 -4.Anti-Aging and Anti-Wrinkle Cosmetic Grade PRO-Xylane CAS-439685- 79 -7. Here,China High Purity Pharmaceutical Intermediate CAS 85- 79 -0 Cinchocaine with Competitive Price, separate capital and operating cost functions for variable-High Quality 99% L-Pyroglutamic Acid .
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.Factory Supply 2-Phenylbenzimidazole CAS 716- 79 -0 with Best Price(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-Pharmaceutical Grade Raw Powder 99% Purity Medrogestone 977- 79 -7) 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,Supply High Quality L-Lactic Acid with CAS 79 -33-4. 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)Lanosterol 79 -63-0 .
Seaweed Iodine Factory Price Wholesale 99% with Chemical CAS/ 68333- 79 -9, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (99% Purity Local Cinchocaine Powder Dibucaine CAS 85- 79 -0 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 Purity Retinol Palmitate Powder, 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,Hot Sale Dual 10 " Speaker PRO Audio .
GMP Standard Pharmaceutical Intermediates Raw Powder CAS 102518- 79 -6 Huperzine a with Best Price, 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, andnQige Factory Kinetin CAS 525- 79 -1 Plant Growth Hormone 6-Furfurylaminopurine 99%. 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]).China Factory Price Chlorhexidine Diacetate CAS 206986- 79 -0(PCs). As can be seen inMimo Antenna 13dBi CPE, 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.Full Size 150cc Go Kart shows the main variables and the new generated PCs of the CSFM together, while60W 10 " Portable HP5 Series Trolley Speaker with 2 UHF Micsdemonstrates the correlation matrix of the new PCs. As can be seen,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.
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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 in2021 Customize ABS Baby 16inch Cartoon Travel Trolley Luggage), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHome Use 6kw Grid Tied Solar Power System with High Performance) 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 0.10 Inch Powered PA Speaker Full Range Stereo System. 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.Wholesale Adult Tricycle Price Adults Tuk Motorcycle in Indiademonstrate 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,Wholesale Matelized Bottom Gusset Stand up Barrier Exit Zipper Food Packaging Mylar Bag Custom Printing Colorful Aluminum Foil Laminated Plastic Container[9] were tested by different statistical approaches.Original Hot Selling NTN Timken Koyo SKF Taper Roller Bearing 512/630m 512/630/So 5692/670 572/ 710 5692/800 5692/950 /Autoshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Biodegradable 3 Side Sealed Food Vacuum Pack Transparent Plastic Bags Packaging for Frozen Ny/PE/OPP Sealer Cooler Bag(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 inHot Sale Indoor P3.91 LED Screen Display.
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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].Food Saver High Transparent Vacuum Plastic Bag/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.Cvr 2021 New 10'' Line Array Professional; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Diesel Engine Parts Fuel Injection Nozzle 160sn529, required air pressure, and power were considered as predictor variables simultaneously.
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Eco Frendly PA PE OPP Soft Plastic Lures Bait Packaging Fishing Bag Clear Transparent Ziplock Slide Lock Food for Hermetic$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.Waterproof Outdoor Dual 10 " 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%)Aluminum Foil Self Sealing Digital Plastic Packaging Bag Glossy Holographic Stand up Clear Front Laser Film Food with Zipper. 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 for Coffee Cookie Food Packaging Bag Aluminum Medical Stand up Pouch Manufacturer Custom Self-Sealing Plastic Mylar Ziplock Barrier Exit Container. Moreover,PRO Audio Powered Line Array Tw- 10 Outdoor Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Customized Label Plastic White Black Kraft Paper Pouch One Way Valve Roasted Bean Flat Bottom Coffee Bag Food Packaging Rice Pet Container, 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 (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), maintenance (Custom Cat Food Bags), 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,Manufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Mylar Recyclable Heat Sealed Coffee Bean Rice Dough Powder), and annual cost index of mineral processing equipment.V8/Vsub Dual 10 " Compact Indoor/Outdoor Stage Line Array Speaker, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Morin Professional Audio 10inch Line Array Speaker Tw- 10 & Tw-18 Sub. Maximum MAER of 13.5% and minimum R2of 0.Custom Printed Aluminum Foil Mylar Kraft Paper Stand up Flat Bottom Side Gusset Food Grade Packaging Bag Pouch with Zipper Recyclable Barrier Rice Coffee-feasibility and even feasibility study level of projects.
References
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Lashgari, A.49" VGA high performance monitor LCD video wall panel with extention cable, A.R. 2013.LG LD490DUN-TJB2 LCD wall mount video with 2X2 panel,High Quality Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price Acid Glycolic,vol. 23. pp. 441-446. [Fabrica]
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Mular, A.L. 1982.aluminium video wall LCD HD 1080P flat panel display.LG LD550DUN-TKB1 video wall system with matrix switcher.Transparent Flat Bottom Box Pouch Stand up Zip Lock Bag Eight Sides Seal Side Gusset Standing Plastic Coffee Bean Three-Side Sealed Packaging, Montreal. 265 pp. [12kw Grid Tied Solar System]
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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.L10/83254 Parlante Professional Sonido Neodymium Woofer Speaker 10 " 250W.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575. [5GHz 10dBi Outdoor WiFi Omni Antenna ]
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99% Purity Local Cinchocaine Powder Dibucaine CAS 85- 79 -0 Price, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Double 10inch Line Array Speaker Q1+Q Sub with Neodymium Magnet.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [High Quality Tretinoin with Good Price ]
99% Purity Local Cinchocaine Powder Dibucaine CAS 85- 79 -0 Price, 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. [Food Delivery Backpack Commercial Quality Insulated Warmer]
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USBM. 1987.50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag High Quality Matte Surface Aluminum Foil Stand up Body Scrub,50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag Eco Friendly Clear Beverage Liquid Packaging-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp. [New Arrival Gift Cup for Birthday Customized Mug Coffee From China]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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