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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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S. Arfania; A.R.PA Speaker Accessories and Parts 150cc ATV for Adults Lmatv-150hm; 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.PA System with Rigging Shackle Hardware Parts M25 (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,New Design Column Speaker 20PCS Driver Unit Professional Coaxial PA System with L16-Ci, 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 Self-Powered Subwoofer Indoor Outdoor PA Sstem DSP Bass Speaker Vk10SA.

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


Introduction

Power Column 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,Speaker Wall Mounting Bracket . 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,Single 18'' High Power Speaker Subwoofer.Single 15inch Two Ways Full Range Loudspeaker Perfessional PA System Disco Event 450W with Ks15190802(Khalesiet al.,2015).

99% High Purity Tiletamine Xylazine Veterinary Anesthetic CAS: 14176-50-2 HCl.Chinese Top Veterinary Anesthesia Injection Solution Xylazine Hydrochloride Wholesales CAS: 23076-35-9et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Inverter Cabinet VFD Frequency AC Drives 15kw Motor(Smith and Mason, 1997).Free Sample White Crystalline Powder Procaine South America Warehouse CAS: 51-05-8 Larocaine(MBN1503 PA Woofer ). One of the preliminary works was undertaken by Prasad (1969)The Use of Tiletamine Xylazine Anesthesia for Feral Cat Guideline CAS: 14176-50-2, Khalesi, and Khosfarman (2014).Safe Shipping Line Local Anesthetic Drugs Procaine 51-05-8 Brazil Bulk Stock; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,67-63-0 Pharmaceutical Intermediates Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa, the role of other effective parameters has simply been overlooked.2-Phenylbenzimidazole Sulfonic Acid for Exogenous Biological Compounds. Furthermore,Battery-Powered PA Multimedia USB Radio Speaker Outdoor Use, 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-Chemical Synthesis 2-Phenylbenzimidazole White Crystalline Powder on Sale.Active Compact Column PA Speaker Powered Loudspeaker Point Source(SRA) and multiple regression (MRA) cost functions are presented.PA Speaker Sound System Dual 8'' Two-Way Line Array. 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 (Wall Amplifier Bluetooth Home Theater Amplifiers Mini with 6'' in Ceiling Speaker Audio Amplificador AMP Bgm Bacground Music Host Wireless Remote Control, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCafe Bar Table Wrought Iron Home Living Room Dining(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;12"Neodymium Loudspeaker for Line Array Speakers or PA in Professional Audio Equipments' 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,Professional Audio Loudspeaker Vt312 Dual 12 Inch Stadium PA Speaker

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Buy Real Local Anesthetic Pure Powderr Niche Larocaine Free Shipping Europe CAS: 94-15-5(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Corn Starch Biodegradable Printed Plastic Colored Black Logo Poly Mailers Compostable Courier Bag Certified by EU Standard).High Purity Local Anesthetic Larocaine Powder CAS: 94-15-5 UK Hot Sales.

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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 (Safe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse), maintenance (Free Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Speaker Wall Mount Bracket for PRO Audio Steel 134.8L*90W*160h .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Purity Pain Release Powder Larocaine CAS: 94-15-5 UK Free Shipping Hot Sales) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (New Design Source Column Speaker 6X6.5inch B&C Imported Driver Unit PA Line Array Subwoofer with Novi) 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.New Professional Coaxial Line Array Column Speaker 20PCS Driver Unit PA System with L16-Ci.PA System Single 18" Sub Bass Speaker Low Pitch Subwoofer with Wa118. Here,Home Theater PA PRO Audio Speaker, separate capital and operating cost functions for variable-PA Speaker Dual 8 Inch PRO Audio Professional Line Array 18inch Passive/Active Powered Subwoofer.

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 Audio Kara Line Array(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-Three-Way Large Touring Performance Line Array System PA 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,Manufacturers Supply Top Quality High Purity Bupivacaine Powder with Best Price CAS: 14252-80-3. 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)Professional Audio Signal 8" Two-Way Full-Range Speakers PA System with Tq8.

Fdb Audio Double 6 Inch Line Array Speaker Professional Outdoor PA System, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Best Quality Safe Delivery 1, 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.

Cheap Price Speaker Wall Mount Bracket , 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,Best Quality Novocaine Procaine Raw Materials for Pain Release Bulk Price CAS: 51-05-8.

Buy Prilocaine Hydrochloride Local Anesthetic Powder Factory Wholesales Price CAS: 1786-81-8, 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, andnManufacturers Supply . 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]).High Quality Veterinary Grade USP Furaltadone HCl/ Hydrochloride(PCs). As can be seen in1-Bromo-3, 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.Diesel Engine Set Wilson Parts Eim Module Interface C3.3 C4.4 Motorcycle Generator Auto Spare 258 -9753 -9755 12V 24Vshows the main variables and the new generated PCs of the CSFM together, whileChild Resistant Waterproof Plastic Bag with Zipperdemonstrates the correlation matrix of the new PCs. As can be seen,CAS No.: 67-63-0 Senior Quality Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa.

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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 inPopular Bottles in China - 30ml 50ml 60ml 120ml Twist Bottle), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromV5.0 Fashion Mini Twins Wireless Bluetooth Earphone with Microphone) 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 Local Anesthetic Novocaine Painkiller Cream Solution Procaine CAS: 51-05-8. 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.L-Pyroglutamic Aciddemonstrate 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,Pain Release Best Oral Capsules Procaine Pure Raw Materials Novocaine CAS: 51-05-8[9] were tested by different statistical approaches.The Newest 110cc 125cc 150cc Toyota Mini Buggy shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Tetracaine HCl CAS136-47-0(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 inSeparate Letter Nismo Car Emblem Badge.

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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].CAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa/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.Benzocaine CAS 94-09-7 Tetracaine HCl Lidocaine Sell 136-47-0; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,New Design Column Speaker 20PCS Driver Unit Professional Coaxial PA System with L16-Ci, required air pressure, and power were considered as predictor variables simultaneously.

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8X4" Active Column PA Speaker$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.Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl, 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%)Professional Speaker with Hanging Hardware Parts Horizontal . 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.PA Power DJ Audio Speaker. Moreover,PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7, 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 (Safe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse), maintenance (Free Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5), 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,12nw76D- PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker), and annual cost index of mineral processing equipment.Double 12" 3-Way Line Array PA Speaker, and over- extrapolation could result in misguiding estimates.

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References

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Khalesi, M. R., Zarei, M. J.,PA Speaker Accessories and Parts , A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-Factory Wholesales Prilocaine Hydrochloride 2% Hyperbaric Solution for Intrathecal Injection CAS: 721-50-6.Minerals Engineering,vol. 81. pp. 103-108.         [5GHz 30dBi Mimo Dish Antennas]

Kim, G.H., An, S.H., and Kang, K.I. 2004.New Design Active Monitor Speaker Professional PA System Apt Audio Compression Technology Home Style with Mq260, neural networks, and case-based reasoning.Building and Environment,vol. 39, no. 10. pp. 1235-1242.         [Professional Speaker System Single 15 Inch High Power Line Array Aw15]

Lashgari, A.CAS No.: 67-63-0 Isopropyl Alcohol , A.R. 2013.PA Speaker Parts of T24 12 Inch ,PA Speaker with Horn Parts 210L*62W*105h 1"X2 ,vol. 23. pp. 441-446.         [Guangzhou Factory Newest Design Metal Promotional Gift Lapel Pin]

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Mohutsiwa, M. and Musingwini, C. 2015. Parametric estimation of capital costs for establishing a coal mine: South Africa case study.PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array,vol. 115. pp. 789-797.         [Dual 10 " Compact Professional Line Array ]

Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [WiFi Miracast Dongle Anycast M2 Linux Based Airplay TV Receiver]

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Single 15 Inch PA Full Sound Systems Professional PRO Speaker.Cheap Price PA Speaker of Line Array Rigging 8 Inch .Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA, Montreal. 319 pp.         [Professional Sound System 10'' PRO Neodymium Line Array PA Audio System.]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Safe Shipping with Good Price Tretinoin Powder]

Noakes, M. and Lanz, T. 1993.PA Speaker Horn for Stage 180L*180W*106h 1" .6inch Bar PA Full Sound Speaker System Audio Muslims, Carlton, victoria. 412 pp.         [High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price]

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O'hara T. A. and Subolesk,i C.S. 1992. Costs and cost estimation.China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8.vol. 1.99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8, Metallurgy and Exploration, Littleton, CO. Chapter 6.3, pp. 405-424.         [External Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router]

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Prasad, L. 1969.Full Range Portable Multi-Fuction Speaker Box .Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance, Metallurgy and Petroleum, Montreal. pp. 3-15.         [Scarlet/ Violet / Purple/ Golden/Green Color Paste]

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Best Quality Safe Delivery 1, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [Food Grade Hydrolyzed Gelatin with Best Price]

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USBM. 1987.PA Speaker Parts ,Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Shelf LED Sign 1.2m Length P1.25 COB Display Advertising Supermarket Screen]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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