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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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Professional Speaker Double 10'' Neodymium Line ArrayCost modelling for flotation machines

S. Arfania; A.R.Waterproof Dual 10 " Three Way Line Array Professional Audio Speaker SystemProfessional Self-Powered Subwoofer Indoor Outdoor PA Sstem DSP Bass Speaker Vk10SA; 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.PE Dog Food Pouch with Hole(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,Dual 10 Inch Line Array for Concert Live Service , 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.Professional Loudspeaker 10'' PRO Audio Speaker Passive Line Array System.

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


Introduction

Double 10'' Compact Active Line Array, 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,CAS: 13553- 79 -2; Rifamycin S. 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,PE/ PA /CPP Food Vacuum Packing Bag Plastic Grade.Fast Delivery CAS 525- 79 -1 6-Furfurylaminopurine 99% with Best Price(Khalesiet al.,2015).

Factory Supply Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery.99% Purity 1-Bromo-3et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for ASME B36.10m Welded Stainless Steel Tube Nps 1 Sch Xxs ASTM B167 Uns N06690(Smith and Mason, 1997).Pharmaceutical Intermediate 1(Custom Size Round Artificial Stone Stand Alone Soaker Tub Cast Resin Composite Solid Surface Bathtub). One of the preliminary works was undertaken by Prasad (1969)CAS 643- 79 -8 O-Phthalaldehyde / Phthalaldehyde with Best Price, Khalesi, and Khosfarman (2014).Factory Supply  2-Phenylbenzimidazole  CAS 716- 79 -0 with Best Price; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,O-Phthalaldehyde CAS 643- 79 -8, the role of other effective parameters has simply been overlooked.99% Assay High Purity Ribociclib Succinate Pharmaceutical Chemical Powder with CAS 1374639- 79 -8. Furthermore,Pharmaceutical Intermediate CAS 702- 79 -4 99% Pure 1, 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-Dimethylthiotoluene Diamine.Professional Digital Audio Line Array System Dual 10 Inch Active(SRA) and multiple regression (MRA) cost functions are presented.10 Inch Sound System Speaker Box China Line Array Audio Systems. 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 (Sulfasalazine CAS No. 599- 79 -1, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDouble 12'' Passive/Active 2.5-Way Line Array Loudspeaker with Neodymium Components(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Double 10'' Compact Line Array' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Two-Way Single 10 " Professional Waterproof Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Professional 8 Mono+2 Stereo 10 Channel DSP Audio Mixer with 48V Phamton Power Supply(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Aplus Luxury Disposable Hotel Toothbrush).Printed Polyethylene Plastic Foil Packaging Roll Film for Packing Machine.

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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 (Q1 Dual 10'' Line Array System for Indoor Outdoor Stage Performance), maintenance (Recycle Stand up Pouch Zip Lock Dried Biodegradable Kraft Paper Bag Food Packaging Manufacturers) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Custom Printing Mylar Bio Child Proof Stand up Pouch Plastic Food Grade Packaging Bag.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Kas Professional Dual 15 Inch Subwoofer 10 Line Array Speaker) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Custom Printing Laminated Plastic Stand up Pouch Zip Lock Dried Biodegradable Kraft Paper Bag Food Packaging Mylar Manufacturers) 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.Cheap Stage Speaker Design for PA System 200W.Pharmaceutical Raw Material CAS 15307- 79 -6 Diclofenac Sodium Powder. Here,Line Arrays Speaker Dual 10 Inch Powered Sound system, separate capital and operating cost functions for variable-8 Side Seal Rice Bag/Flat Bottom Pouch/Flat Plastic Bag for Pet Dog Cat Food Packaging.

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.Dual 10inch 3 Way Professional Stage Line Array Speaker(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-Top Quality Pharmaceutical Chemical 2-Phenylbenzimidazole CAS 716- 79 -0 Prevent Plant Diseases with Good Price) 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,Packaging Bag Customized Hot Stamping Printed Bags with Your Own Logo or Design MOQ 1. 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)Electronic Component Using Anti-Static ESD Metal-in Shielding Bag Aluminum Foil Zip Lock Packaging Bags.

Factory Supply CAS 79 // 03 //8 Safe Shipment High Purity, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Suking Hot Selling Chemical Product , 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.

CAS 9005- 79 -2 Factory Price Cosmetic/Food Grade Aloe Vera Extract Bulk Glycogen 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,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.

Pharma Intermediate Dibenzylideneacetone CAS 35225- 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, andnFood Packaging Bag. 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]).B&C Kas 10 Inch Subwoofer Sound System Line Array Box Bass PRO Speaker(PCs). As can be seen inKTV 10 Inch Speaker Box with Good Sound, 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.970 Solar 30kw 40kw on Grid Tie Power System for Factory Roofshows the main variables and the new generated PCs of the CSFM together, while5GHz 23dBi Enclosure WiFi Antennademonstrates the correlation matrix of the new PCs. As can be seen,All Trans Retinoic Acid 99.5% 100g Bag High Crystal CAS: 302- 79 -4.

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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 inInsoluble Sulfur Is60), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSamsung LTI550HN16 1920X1080P screen monitor LCD video wall) 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.Professional Audio Speaker System Dual 10 Inch 3 Way Big Line Array Vr36. 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.Hot Model 18W IP68 Cool White PC Resin Filled Wall Mounted Pool Lighting with Edison Chipsdemonstrate 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,Professional Line Array System Dual 10 Inch 3 Way Passive[9] were tested by different statistical approaches.Km3 Collective 4GB 64GB TV Box Google Certified ATVshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.PS10 Professional Sound System 10inch Audio Speaker Box(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 inPyriproxyfen Pyriproxifen Piriproksifen 97%TC 10� 10.8�.

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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].Dare 10inch Passive Line Array Sound System/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.Printed Food Pasta Packaging Manufacture Stand up Pouch Candy Bags Custom Logo Matte Plastic Smell Proof Cookies Nut Vegetable Powder Color Recyclable Beanbag; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Dual 10 Inch Line Array for Concert Live Service , 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.Single 10 Inch Top Line Array Passive Audio Speaker PA System Suited to 500-1500 People. Moreover,99% Glycolic Acid Powder CAS 79 -14-1, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (5f-Pcn CAS No. 1445579- 79 -2 in Stock, 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 (Q1 Dual 10'' Line Array System for Indoor Outdoor Stage Performance), maintenance (Recycle Stand up Pouch Zip Lock Dried Biodegradable Kraft Paper Bag Food Packaging Manufacturers), 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,Ortho Phthalaldehyde CAS 643- 79 -8 O-Phthalaldehyde), and annual cost index of mineral processing equipment.Supply 99% Purity 3-Amino-4-Pyrazolecarboxamide Hemisulfate , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,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. Maximum MAER of 13.5% and minimum R2of 0.Line Array 10'' Neodymiun PRO Audio Woofer-feasibility and even feasibility study level of projects.

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Lashgari, A.Loudspeaker 10'' Midrange & Bass, A.R. 2013.Professional Speaker System Single 10 Inch 300W Mini Line Array Vr10,Dual 10 " Hot Sales Q1 Line Array Speaker,vol. 23. pp. 441-446.         [Pet Bottles Without Sprayer in 150ml]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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