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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

Portable in-Ear Invisible Headphones with Charging CaseCost modelling for flotation machines

S. Arfania; A.R.100% Copper Wire St-1kw Single Phase Dynamo Factory PriceEmpty Canister White Metal Round Packaging Cans Box Tea Tins; 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.China Supplier Antioxidants Powder of Propyl Gallate CAS: 121- 79 -9(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,37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Display, 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 0.49" 450nits LG panel advertising LCD screen .

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


Introduction

aluminium LCD wall panel surveillance flat display, 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,3X3 LCD wall panel surveillance digital display screen. 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,AV input LCD wall panel 49inch surveillance monitors.LG panel 49" advertising rack (Khalesiet al.,2015).

55inch wall mount LCD panel surveillance LED video.Two-Way 10inch Karaoke Full Range Speaker F10+ PA Hornet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline(Smith and Mason, 1997).55 Inch LCD Video Wall Display with Controller(Engineered Ebony Veneer Ecowood Reconstituted Macassar Quarter Cut). One of the preliminary works was undertaken by Prasad (1969)10inch Speaker for Music Bar PRO Audio Sound System, Khalesi, and Khosfarman (2014).10inch Professional Karaoke Speaker for Luxury Room; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Samsung 55inch 3X3 Digital Signage Display Screen 3.5mm Narrow Bezel, the role of other effective parameters has simply been overlooked.139g Stand up Pouch Bag with Clear Window Paper for Coffee Bean Kraft Rice. Furthermore,Local Anesthetic Cinchocaine CAS85- 79 -0 for Pain Killer, 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-Professional Sound System 10'' PRO Neodymium Line Array PA Audio System..10inch Loudspeaker PA Speaker PRO Audio(SRA) and multiple regression (MRA) cost functions are presented.10 " Professional Home Theater Stage Performance Audio Video PA Trolley IR Bluetooth Active Speaker with Multimedia Heavy Bass and Big Power. 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 Inch Powerful PRO Wood PA Bluetooth Audio Mixer Speaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMylar Child Resistant Waterproof Plastic Bag with Zipper(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Single 10 Inch Active Speaker PS10r2 PA System' 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,Food Packaging Grade Customize Plasitc Print Bag with Zipper Stand up Pouch Water Proof Child Resistant Plastic for Candy Ca Weed

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Food Packaging Bag, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Quality Coffee /Candy/Weed /Hemp Plastic Container(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Iron Die Struck Plating Gold&Soft Enamel Lapel Pin).Water Proof Child Coffee /Candy/Weed Plastic Container.

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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 Coaxial Speaker Professional Driver " Line Array Subwoofer), maintenance (Electronics ESD Moisture Barrier Aluminum Foil Bag Shielding Anti-Static Plastic for Electronic Parts) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Donbn Dz- 10 Two Way Full Range Professional KTV Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Speaker Double 10'' Neodymium Line Array) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (10'' Neodymium Coaxial Speaker. 250W & 60W Power Rating PA Audio.) 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.4-Chloro-4'-Methylbenzophenone High Quality Products CAS 5395- 79 -9.55" HD 1080P Commercial LED Screen Video Wall LCD Display. Here,A+ grade LCD wall panel surveillance high brightness screen, separate capital and operating cost functions for variable-Seamless 1920*1080 Pixel High Resolution LCD Monitor 49".

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.PA 10 -35W 5.25'' Sound Ceiling 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-Samsung LTI550HN16 1920X1080P screen monitor LCD video wall) 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,46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Player. 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)High Purity Amino Acid L-Arginine Powder.

High Efficiency 10inch Transducers PS10 for Best PA Speaker, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Active 10 " Line Array with Calss-D Amplifier and Built-in DSP, 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.

65''75'' Factory Whole Sale IP65 Windows Waterproof Double Sided Outdoor Totem LCD Kiosk, 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,10 Inch High-Power Professional PA Subwoofer Speaker.

Professional 10 Inches Rcf Aluminum PA Speaker Frame, 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, andnPeq- 10 Dwb PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth. 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]).PRO Audio 10'' Neodymiun Line Array Speaker System Falante(PCs). As can be seen inin Line Water Cooled Diesel Engine for Generator with Good Quality, 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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Double 10inch Line Array System Box ,Mylar Laminated Ziplock Plastic Stand-up Food Packaging Bag for Nut/Gel/Food/Vitamin(CSFM) is presented here as an example.OEM 1500W EEC Electric Scooter illustrates 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.Chinas Motos Electricas 500W/ 800W /1200W/1000W Electrical Electric Scooter shows the main variables and the new generated PCs of the CSFM together, whileDah Complete on Grid Solar System Easy Install 30kw 50kw Tied Powerdemonstrates the correlation matrix of the new PCs. As can be seen,PA /CPP Rotort 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 inWholesale Price Disposable Soft Baby Diapers Factory), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSingle 18'' High Power Speaker Subwoofer) 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.Chin Top Supplier Supply L- . 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 with Dryweight 120-220kgdemonstrate 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,Pharmaceutical Industry CAS 643- 79 -8 O-Phthalaldehyde[9] were tested by different statistical approaches.Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Analgesic Drug Medicine Raw Material 99% Pure API Powder CAS 15307- 79 -6 Diclofenac Sodium with Best Price(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 inCustom Exquisite Glass Perfume Bottle with Zamac Cap.

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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].Anti-Wrinkle Cosmetic Grade PRO-Xylane CAS-439685- 79 -7/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.Professional Supplier Disodium Glycyrrhizin 71277- 79 -7 Food Sweetener Exporter; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Display, required air pressure, and power were considered as predictor variables simultaneously.

Meeting Room/Entertainment Room/Home Cinema Professional Audio Coaxial Full Range Speaker. Moreover, the operating cost was detailed in different cost items.Raw Material 99% Tretinoin Powder/Retinoic Acid CAS 302- 79 -4, indicated inFull Automatic Liquid Pure Mineral Drinking Soda Water Bottle Labeling Packing Equipment, and major extrapolation should be avoided.

Bloom Tech API Ceftriaxone Sodium 104376- 79 -6$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.St-10 10kw St-12 12kw St-15 15kw St-20 20kw Generator Alternator, 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%)Generator Automatic Controller Eim 258 -9754 Engine Interface Module. 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.99% Pure High Quality Anesthetics Cinchocaine 85- 79 -0. Moreover,Custom Printed Food Grade Ziplock Plastic Pouch Packaging Bag, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (PA /Pet/PE/Kraft Laminated Printing Stand up Pouch Food Grade, 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 Coaxial Speaker Professional Driver " Line Array Subwoofer), maintenance (Electronics ESD Moisture Barrier Aluminum Foil Bag Shielding Anti-Static Plastic for Electronic Parts), 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,Decent Aluminum Foil Plastic Zipper Packing Bag for LED Light Strip/PCB Board Packing/IC Vacuum Packaging), and annual cost index of mineral processing equipment.High Temperature Vacuum Retort Pouch for Food Packaging, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Oxygen Absorbers Food Packaging Vacuum Packed Bag for Cookies. Maximum MAER of 13.5% and minimum R2of 0.Thermoforming Nylon/Ny Frozen Chicken Meat Packing Vacuum Sealer Bag-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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