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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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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.High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers(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,K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets , 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 0.12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage.

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


Introduction

Proxima Entertainment S-320 Speaker, 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,Karaoke Voice Reduction Professional Audio Converter Proaudio . 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,Sp215 Sound Prince Style Speaker Acoustic.China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6(Khalesiet al.,2015).

Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker .Best Sale Bulk Price1et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Everun Brand 0.8ton Compact Wheel Loader with 4in1 Bucket(Smith and Mason, 1997).Passive Full Range 2-Way Speaker Line Array for Outdoor(PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker). One of the preliminary works was undertaken by Prasad (1969)Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse, Khalesi, and Khosfarman (2014).High Power Horn Speaker H3; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box, the role of other effective parameters has simply been overlooked.Levamisole Hydrochloride CAS 16595-80-5 in Stock. Furthermore,Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4, 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-Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606.2.4GHz Wireless Ceiling Speaker PA System(SRA) and multiple regression (MRA) cost functions are presented.OEM ODM Public DJ PA Wooden Speaker. 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 (Double 12" Line Array Speaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in18L Square Metal Tin Cans with Handle and Lid for Oil(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01' 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,CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Pharmaceutical Intermediate Bulk Price N- (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Quartz Sheets for Countertop and Decoration).Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supply.

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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 (Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand), maintenance (Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Speaker System High Power H3.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4) 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.500W Powered Speaker Professional Sound Line Array System .Proxima Entertainment Z-450 Digtal Speaker. Here,Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500, separate capital and operating cost functions for variable-Lat210A Srx700 Series PA Sound System Professional Speakers.

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.Professional Public Address Mini Onwall 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-Q1--Dual10 Inch Line Array Speaker) 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,12inches PA Speaker Audio Component. 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)Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth.

Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Power Amplifiers PA Speaker System Amplifier 1000 Watt, 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.

Wholesales Organic Intermediate 1, 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,Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell.

Live/Installed Sound System PRO Speaker Box , 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, andnOutdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PA. 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]).Professional Speaker with Laser Light (PCs). As can be seen inPassive Full Range 2-Way Speaker Line Array for Outdoor, 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.5GHz 18dBi Dual Polarized Enclosure Antenna shows the main variables and the new generated PCs of the CSFM together, whilePlastic Products Pellets Raw Granulesanti-Static Material Yellow Antistatic Masterbatch Customized Home Appliancedemonstrates the correlation matrix of the new PCs. As can be seen,100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4.

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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 in500ml Hand Liquid Soap Mint), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromCvr 2021 New 10'' Line Array Professional) 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.Free Sample Organic Chemicals 1. 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.Doypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp Bagdemonstrate 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,High Quality Phena[9] were tested by different statistical approaches.Analgesic Anti-Inflammatory Powder Indometacin Anti-Rheumatism CAS: 53-86-1shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4(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 inWholesale White DC Constant Voltage 12V 5A Power Adapter for Massager.

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Cost model for variable-18" Fane Style Aluminum Speaker Frame

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].18" Die Cast P-Auido Style Aluminum Frame/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 Stage Active Line Array Speaker with DSP; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets , required air pressure, and power were considered as predictor variables simultaneously.

Single 18" Subwoofer Speaker Box. Moreover, the operating cost was detailed in different cost items.Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse, indicated inFactory Price Agricultrue Fertilizer with Caprolactam Grade, and major extrapolation should be avoided.

12" Professional Rcf Style Speaker Frame$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.Horn Professional Speaker H3, 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%)Coaxial Loudspeaker TD12. 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.18'' Subwoofer Speaker Box Ls1200. Moreover,Dual 12" Subwoofer Speaker Box, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional, 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 (Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand), maintenance (Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl), 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,Fast Delivery 1), and annual cost index of mineral processing equipment.Professional Speaker Box F12+, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Df B&C Trees Speaker Subwoofer Audio Professional. Maximum MAER of 13.5% and minimum R2of 0.15'' Coaxial Speaker -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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