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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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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.120W 12" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics(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,Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA, 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.Single 15 Inch PA Full Sound Systems Professional PRO Speaker.

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


Introduction

Cheap Price PA Speaker of Line Array Rigging 8 Inch , 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 Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729. 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,PA Speaker Horn for Stage 180L*180W*106h 1" .6inch Bar PA Full Sound Speaker System Audio Muslims(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Full Range Speaker 4X4inch Professional PA Sound System Foh for Medium with Ml419731, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inGy6 -125 Spark Plug Cap OEM Quality Motorcycle Parts(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Music PA Speaker Double 12 Inch Full Range' 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,Outdoor Big Power Karaoke Trolley Loud PA Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),20dB Gain DJ Mixing Console with MP3 Input (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Top Quality Big and Red Flower Disperse Textile Fabric for America).PA System LED Light Trolley Tws Woofer Speaker Party Audio.

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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 (Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System), maintenance (50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage) 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.Proxima Entertainment S-320 Speaker.Karaoke Voice Reduction Professional Audio Converter Proaudio . Here,Sp215 Sound Prince Style Speaker Acoustic, separate capital and operating cost functions for variable-China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6.

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.Cheap 500W Professional Audio Speakers Dual 15 Inch 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-Best Sale Bulk Price1) 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,Passive Full Range 2-Way Speaker Line Array for Outdoor. 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)Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse.

High Power Horn Speaker H3, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box, 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.

Levamisole Hydrochloride CAS 16595-80-5 in Stock, 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,Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4.

Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606, 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, andn2.4GHz Wireless Ceiling Speaker PA System. 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]).OEM ODM Public DJ PA Wooden Speaker(PCs). As can be seen inSolar Pump Inverter 1.5kw AC Drive Frequency Welding Machine, 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.2ND Generation Ultrasound Bone Densitometershows the main variables and the new generated PCs of the CSFM together, whileMetal Packing Chemical Round Tin Candemonstrates the correlation matrix of the new PCs. As can be seen,12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio.

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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 inPlain Metal Pin Belt Buckle), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Audio PA Subwoofer Component Speakers Bocinas) 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.Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2. 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.Adult Electric Motorcycle with Lithium Battery Chinademonstrate results for the machines modelled in this research.

Multiple regression results

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Cost model for variable-Pharmaceutical Intermediate Bulk Price N-

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].Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supply/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

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CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical$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.Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4, 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%)500W Powered Speaker Professional Sound Line Array System . 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.Proxima Entertainment Z-450 Digtal Speaker. Moreover,Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Lat210A Srx700 Series PA Sound System Professional Speakers, 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 (Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System), maintenance (50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics), 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,Professional Public Address Mini Onwall Line Array Speaker ), and annual cost index of mineral processing equipment.Q1--Dual10 Inch Line Array Speaker, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,12inches PA Speaker Audio Component. Maximum MAER of 13.5% and minimum R2of 0.Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Loudspeaker 10'' Midrange & BassHigh Toughness and Tensile Strength Resin 610Corresponding author

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