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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
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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.Phthalaldehyde CAS 643- 79 -8(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,Chlorhexidine Diacetate CAS No 206986- 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.CAS 79 -14-1 Glycolic Acid 70%.

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


Introduction

Compact Neodymium Line Array 12inch 400W Passive Speaker PA System, 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 10 " Aluminum Speaker Basket. 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,New Arrival Mr Series Audio Mixer with DSP Mr-10fx.Factory Price Powder Mannitol with High Quality(Khalesiet al.,2015).

Outdoor Line Array PA System Loudspeaker.Karaoke Wireless Portable Wooden Bluetooth PA Speakeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Jwell Raincoat TPU Film Extrusion Machine(Smith and Mason, 1997).12" Line Array Loud Speaker Sound System Professional PA(Industrial Vacuum Atmosphere Hot Pressing Sintering Furnace). One of the preliminary works was undertaken by Prasad (1969)15inch Professional Stereo Sound PA PRO Audio DJ Loud Speaker, Khalesi, and Khosfarman (2014).Professional Line Array PA System S1210 Sound; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Cosmetic Material 99% Purity Tretinoin Powder, the role of other effective parameters has simply been overlooked.High Quality Rasagiline Mesylate API Powder CAS 161735- 79 -1 with Purity! !. Furthermore,Spts, 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-High Power DJ Sound Equipment System Line Array PA Speaker.2X12 Outdoor Compact Neodymium PRO Audio PA Event Line Array(SRA) and multiple regression (MRA) cost functions are presented.Best Price Medicine Grade Lanosterol Powder. 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 (Outdoor Professional Audio Loudspeaker PA Stage Active Line Array, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDisperse Red/Blue/Orange/ Violet /Black(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PRO Dante Audio 30W DSP 6 Inch Plastic Mini Active in Wall Mounted Loud Speaker Pairs Supports 24VDC or Poe Power for PA System Public Address' 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,Waterproof Childproof Ziplock Valve Bag

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Children's Short- Sleeved Sportswear Suit Boys' Baseball Jacket Girls' Breathable Gym Wear Shorts Two-Piece).Factory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Price.

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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 (L-Arginine Powder Amino Acid Pure Manufacturer), maintenance (White Powder Vitamin a for Food and Feed Grade) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Line Array Speaker Neodymium Af15) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic Grade) 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.Q210 Passive PA Speaker System.Retinol Palmitate/Vitamin a Palmitate Oil as Food Ingredient. Here,Professional 24 Channels Digital Audio Mixer Console, separate capital and operating cost functions for variable-100% Natural Huperzia Serrata Extract 1% 5% 99% Huperzine a Brown Powder Supplements.

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.Skin Care Raw Material Vitamin a Palmitate Powder(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-Lf Drivers 10 Inches Professional Speaker Pw1032-64) 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,12" Loudspeaker as Monitor Speaker System 12 Inch Powerful Coaxial. 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)Made in China PA Speaker System Three Way Loudspeakers.

Line Array Speaker Professional PA System Two Way Full Rang Passive , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Pyridinecas Number 110//86//1 Used as Chemical Reagent, 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.

Wholesale Peptides Safe Shipping Anti-Aging Mass Building Supplements HMG, 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,P-Toluenesulfinic Acid Sodium Salt Hydrate .

Bloom Tech Chemical Reagent Bis , 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, andnCyclopropyl Acetylene/ Lide Pharma- Factory Supply / Best Price CAS 6746-94-7. 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]).CAS: 13463-67-7 Titanium Dioxide Powder(PCs). As can be seen inSKF NSK Timken Koyo NACHI Snr IKO 3811/530 3811/560 3811/600 3811/630 3811/ 710 3811/750 Taper Roller Bearing Branded Bearings, 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.2 Wheel High Speed Lithium Battery E Motorcycle 500W Electric Scooter for Adultsshows the main variables and the new generated PCs of the CSFM together, whileFood Grade Round Tin Can for Welded Milk Powder Packagingdemonstrates the correlation matrix of the new PCs. As can be seen,Karaoke Wireless Portable Bluetooth PA Trolley Speaker Box.

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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 inHot Plain Glass Perfume Bottles 30ml Bottle Parfum with Gold Cap), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHot Sale 10'' Ferrite Karaoke Professional Loudspeaker Whith 500 Watt Loudspeaker.) 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.V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater. 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.Additive PE Green Color Masterbatches Manufacturerdemonstrate 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,PRO Audio PA System Digital Mixer[9] were tested by different statistical approaches.CE China manufacturers mini wheel loader for sale at cheap priceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Food Grade L-Arginine 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 inPopular Bottles in China - 30ml 50ml 60ml 120ml Twist Bottle.

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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].10 " 12"15"18" PA Speakers Loudspeaker Cabinet/Enclosure/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.Wild Bee Venom Extract Melittin 99% Powder for Skin Care; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Chlorhexidine Diacetate CAS No 206986- 79 -0, 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.Chemical Reagent Bloom Tech 2. Moreover,High Quality Opa O-Phthalaldehyde with Best Price, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Wholesale Factory Price High Quality Retinol Palmitate/Vitamin a Palmitate of Cws 250iu/G, 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 (L-Arginine Powder Amino Acid Pure Manufacturer), maintenance (White Powder Vitamin a for Food and Feed Grade), 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,KTV 10 Inch Speaker Box with Good Sound), and annual cost index of mineral processing equipment.10 Inch Powered Line Array Speaker Active, and over- extrapolation could result in misguiding estimates.

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Lashgari, A.10 " Dia Cast Aluminum Professional Subwoofer Basket, A.R. 2013.Food Packaging Vacuum Pouch,Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Delivery,vol. 23. pp. 441-446.         [OEM Custom Fashion 925 Silver Jewelry Necklace with Cross CZ Charm]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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