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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

GENERAL PAPERS

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S. Arfania; A.R.Pharmaceutical Chemical 1-Hydroxypyrene CAS 5315- 79 -7Safety Cover Full Mini Enclosed Sealed Fiber Laser UV Marking Machine Price; 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.Factory Supply Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery(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,Polymer Science 2-Phenylbenzimidazole CAS 16- 79 -0, 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.High Quality Custom Printed Pet Food Packaging Bags.

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


Introduction

Clothes /Cosmetics Plastic Packaging PP Bags PEVA/OPP/ CPE/ Pvf Shoes Shirt Storage Stock Self Heat Sealing, 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,Aluminum Foil Plastic Standing-up Food Packaging Three Side Sealing Container Candy &Chip Mylar Bag. 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,Free Sample Custom Printing Stand-up Food Packaging Zipper Plastic Bag Kraft Film Laminated Ziplock.Amino Acid L-Arginine 99% CAS 74- 79 -3(Khalesiet al.,2015).

Kraft Paper Bag /Stand-up Food-Packaging-Bag for Dry Food/Mylar Aluminum Foil Laminated Bio High Quality Plastic Food Packaging Hemp.Matt Food Packaging Child Proof Zipper Plastic Stand up Pouch Water &Air & Smelly Kraft Film Laminated Food&Tea&Coffee&Candy Baget al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Doule 8'' Mini Line Arry Loudspeaker(Smith and Mason, 1997).Glossy & Matte Plastic Flat Bag Three Side Sealing Aluminum Foil with Tear Notch &Ziplock Silver Food Packaging Pouch for Food&Hemp&Tea Smell Resistant(Variable Speed Inverter China Frequency Converter AC). One of the preliminary works was undertaken by Prasad (1969)Hot Sale 10'' Ferrite Karaoke Professional Loudspeaker Whith 500 Watt Loudspeaker., Khalesi, and Khosfarman (2014).Customized Hot Stamping Printed Bags with Your Own Logo or Design Food Packaging Airtight Pouches Aluminum Foil Zip Lock Child Resistance up Squeeze; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Customizable Food Vacuum Smelly Proof Kraft Paper Stand up Mylar Packaging Bag with Zipper& Tear Notch, the role of other effective parameters has simply been overlooked.Custom Liquid Stand up Pouch Spout for Food Packaging. Furthermore,ESD Shielding Anti Static Aluminum Foil Laminated LLDPE Bag for Electronic Parts /LED Lighting Packing, 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-Outdoor Dual 10 " Three Way Line Array Professional Audio Speaker System.2021 New Compact 10 " Active Line Array Speaker Sound System(SRA) and multiple regression (MRA) cost functions are presented.Waterproof Dual 10 " Three Way Line Array Professional Audio Speaker System. 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 (PE Dog Food Pouch with Hole, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPharmaceutical Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory Painkillers(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Dual 10 Inch Line Array for Concert Live Service ' 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,Fast Delivery CAS 525- 79 -1 6-Furfurylaminopurine 99% with Best Price

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Factory Supply Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),99% Purity 1-Bromo-3(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Aluminum Pop up Star Tent Cheap Flight).Pharmaceutical Intermediate 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 (CAS 643- 79 -8 O-Phthalaldehyde / Phthalaldehyde with Best Price), maintenance (Factory Supply  2-Phenylbenzimidazole  CAS 716- 79 -0 with Best Price) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,O-Phthalaldehyde CAS 643- 79 -8.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (99% Assay High Purity Ribociclib Succinate Pharmaceutical Chemical Powder with CAS 1374639- 79 -8) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Pharmaceutical Intermediate CAS 702- 79 -4 99% Pure 1) 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.Dimethylthiotoluene Diamine.Professional Digital Audio Line Array System Dual 10 Inch Active. Here,10 Inch Sound System Speaker Box China Line Array Audio Systems, separate capital and operating cost functions for variable-Sulfasalazine CAS No. 599- 79 -1.

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.Double 10'' Compact 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-Karaoke System 10 Inch Sound Speaker Cvr Professional Audio) 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,2 X HDMI. 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)L10/83267-Professional Audio 10 Inch Coaxial Speaker.

Single 10 " Waterproof Polyurea Active Line Array Speaker Systems, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Airtight Child Pop up Squeeze Plastic Stand Flat Bottom Pet Cat Food Packaging Bag, 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.

Two-Way Single 10 " Professional Waterproof 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,Professional 8 Mono+2 Stereo 10 Channel DSP Audio Mixer with 48V Phamton Power Supply.

Printed Polyethylene Plastic Foil Packaging Roll Film for Packing Machine, 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, andnQ1 Dual 10'' Line Array System for Indoor Outdoor Stage Performance. 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]).Recycle Stand up Pouch Zip Lock Dried Biodegradable Kraft Paper Bag Food Packaging Manufacturers(PCs). As can be seen inSteel Wheel Hub Buggy 150cc ATV, 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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Kas Professional Dual 15 Inch Subwoofer 10 Line Array Speaker,Custom Printing Laminated Plastic Stand up Pouch Zip Lock Dried Biodegradable Kraft Paper Bag Food Packaging Mylar Manufacturers(CSFM) is presented here as an example.15mm Pine Wood Core Block Board for Constructionillustrates 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.Hench Hot Sales Raw Material Powder Oxytetracyclineshows the main variables and the new generated PCs of the CSFM together, whileProfessional Speaker Double 10'' Neodymium Line Arraydemonstrates the correlation matrix of the new PCs. As can be seen,Cheap Stage Speaker Design for PA System 200W.

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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 inChildren Outdoor Plastic Small Playground Equipment), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromDouble 12'' Passive/Active 2.5-Way Line Array Loudspeaker with Neodymium Components) 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.Line Arrays Speaker Dual 10 Inch Powered Sound 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.KTV 10 Inch Speaker Box with Good Sounddemonstrate 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,8 Side Seal Rice Bag/Flat Bottom Pouch/Flat Plastic Bag for Pet Dog Cat Food Packaging[9] were tested by different statistical approaches.Universal Turbo T3t4 T04e T3.63 Ar + 76mm 3" Intercooler Pipe Piping Kitshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Dual 10inch 3 Way Professional Stage Line Array Speaker(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 inLED G24 Bulb High Lumens.

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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].Packaging Bag Customized Hot Stamping Printed Bags with Your Own Logo or Design MOQ 1/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.Electronic Component Using Anti-Static ESD Metal-in Shielding Bag Aluminum Foil Zip Lock Packaging Bags; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Polymer Science 2-Phenylbenzimidazole CAS 16- 79 -0, required air pressure, and power were considered as predictor variables simultaneously.

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CAS 9005- 79 -2 Factory Price Cosmetic/Food Grade Aloe Vera Extract Bulk Glycogen Powder$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.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, 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%)Pharma Intermediate Dibenzylideneacetone CAS 35225- 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.Food Packaging Bag. Moreover,B&C Kas 10 Inch Subwoofer Sound System Line Array Box Bass PRO Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (PRO Audio Double 10 Inch Line Array Speaker Professional Outdoor PA System, 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 (CAS 643- 79 -8 O-Phthalaldehyde / Phthalaldehyde with Best Price), maintenance (Factory Supply  2-Phenylbenzimidazole  CAS 716- 79 -0 with Best Price), 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,Food Packaging Bag Manufacturer Kraft Paper / Matte Glossy Finish Pouch with Foil Lined Hot Sale Cheap Wholesale Item Wire Stock Storage Bags), and annual cost index of mineral processing equipment.Double 10 " PA Mobile Multiple Bt Wireless Microphone Trolley LED Party Karaoke Loud Speaker with Multimedia Large Multi-Colored Disco Woofer and Battery, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,All Trans Retinoic Acid 99.5% 100g Bag High Crystal CAS: 302- 79 -4. Maximum MAER of 13.5% and minimum R2of 0.Line Array Speaker PRO Audio System 10'' Neodymium Loudspeaker-feasibility and even feasibility study level of projects.

References

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Lashgari, A.Dare 10inch Passive Line Array Sound System, A.R. 2013.Printed Food Pasta Packaging Manufacture Stand up Pouch Candy Bags Custom Logo Matte Plastic Smell Proof Cookies Nut Vegetable Powder Color Recyclable Beanbag,Cheap Moisture Proof Zipper Aluminum Foil Tomato Sauce Bag Custom Printed Food Packaging Stand up Pouch 100mg Candy Gummies Bear Cookies Oil Liquid Bags,vol. 23. pp. 441-446.         [2014 Brand New A-Line White Lace Jewel Organza Wedding Dresses Bridal Gowns]

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Mohutsiwa, M. and Musingwini, C. 2015. Parametric estimation of capital costs for establishing a coal mine: South Africa case study.PRO Audio High Power 10'' Neodymium 100mm Voice Coil 1200W Line Array Speaker,vol. 115. pp. 789-797.         [1380 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System]

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Mular, A.L. 1982.High Quality Chemical Product Antioxidant Irganox 1076 CAS 2082- 79 -3.Manufacturer Supply 1.Single 10 Inch Top Line Array Passive Audio Speaker PA System Suited to 500-1500 People, Montreal. 265 pp.         [2021 Set Top Box Global Version S922X TV Smart HD Android 9.0 Internet 8K]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.99% Glycolic Acid Powder CAS 79 -14-1.5f-Pcn CAS No. 1445579- 79 -2 in Stock.Single 10 Inch Top Line Array Passive Audio Speaker PA System Suited to 500-1500 People, Montreal. 319 pp.         [Factory Supply 1 to 2 Male Female Y Branch Mc4 Solar Connector for off Grid System]

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O'hara T. A. and Subolesk,i C.S. 1992. Costs and cost estimation.Line Array 10'' Neodymiun PRO Audio Woofer.vol. 1.Diesel Engine Parts Fuel Injection Nozzle 160sn529, Metallurgy and Exploration, Littleton, CO. Chapter 6.3, pp. 405-424.         [Best Sale Bulk Price1]

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Prasad, L. 1969.Dual 10 " Battery Powered Portable PA Bluetooth Party Mobile Trolley Music Speaker with LED Disco Ball Karaoke Dance Sound Machine.Professional Audio Speaker Dual 10 Inch 3 Way Line Array System, Metallurgy and Petroleum, Montreal. pp. 3-15.         [20MHz Thermal RF Wrinkle Removal Beauty Machine]

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USBM. 1987.Professional Speaker System Single 10 Inch 300W Mini Line Array Vr10,Dual 10 " Hot Sales Q1 Line Array Speaker-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Children Outdoor Travel Student 15.6" Notebook Tablet Sleeve Business Computer School Bag Laptop Backpack]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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