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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

Water Pump Variable Frequency Drive Vector VFD Inverter Elevator Motor PriceCost modelling for flotation machines

S. Arfania; A.R.High Power Two-Way Full Range PRO Audio Speaker Box SystemPP Corrugated Roofing Sheet Extrusion Machine; 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.Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer(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,30W Dante Wall Speaker with External 24V DC Power Supply Dp 430, 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.Kas 12 3 Way Sound System Line Array PRO Speakers with Subwoofer.

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


Introduction

Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer, 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,Rental Application Stage Monitor Audio&Sets. 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,Local Anesthetic Levobupivacaine Powder Brazil Free Sample 27262-48-2.Top Quality Cosmetic Raw Material Chlorphenesin CAS 104-29-0  for  Antiseptic(Khalesiet al.,2015).

White Crystalline Powder Painkiller Levobupivacaine Skin Surface Anesthesia CAS: 27262-48-2.Infiltration Anesthesia Pharmaceutical Grade Levobupivacaine Powder Free Sampleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Polythene Plastic Sheet Making Machine(Smith and Mason, 1997).Top Local Anesthetic Manufacturer Levobupivacaine CAS: 27262-48-2 Wholesales UK(China Hot Sale Banana Ripening Ethephon 90%Tc with Wholesale Price). One of the preliminary works was undertaken by Prasad (1969)99.9% Levamisole HCl/Levamisole Hydrochloride CAS 16595-80-5 Manufacturer with Enough Stock, Khalesi, and Khosfarman (2014).Food Grade Vitamin a Oil Palmitate 1.7million Units. CAS79-81-2; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Rimonabant Powder Weight Loss Factory Direct Supply, the role of other effective parameters has simply been overlooked.Top Local Anesthetic Supplier Marcaine Injection 14252-80-3 Bupivacaine Powder. Furthermore,High Quality Procainamide Hydrochloride 614-39-1, 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-Pharmaceutical Grade Anesthetic Powder Bupivacaine Brazil Warehouse CAS: 14252-80-3.PA Horn Loaded Speaker Professional Loudspeaker(SRA) and multiple regression (MRA) cost functions are presented.Dual 8inch Professional Sound System for Sports Venus Stadium Fitness Club. 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 (Professional Audio Powerful High Compact Line Array Speaker Best Lq10, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inRoadside Emergency Set Auto Car Tool Kit(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;GMP Factory Supply Procaine Powder CAS: 51-05-8 Novocaine Free Shipping' 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,Mixer Power Amplifier with USB

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Powered Line Array Active Stage Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PRO Audio Loudspeaker PA Speaker System Coaxial Compact Line Array(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (R. S Most Popular One Step Gel Polish Soak off UV for Nail Art).PRO Audio Loudspeaker PA Speaker System 12&Rdquor & 15&Rdquor Line Array.

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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 (PA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood), maintenance (Karaoke Speaker System Chinese KTV High Output Compact Box) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Coaxial Speaker TD10.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Sound System Effects for Equipment Hire ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (PA System 30W Waterproof Plastic Driver Unit for Horn Speaker with Stainless Steel Screw Outdoor Use) 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.Outdoor Show Audio Lt12 Passive Line Array Speaker System.Karaoke Microphone Bluetooth Sound Mixer Video Conference. Here,Outdoor Speaker Professional Audio Factory, separate capital and operating cost functions for variable-Active Speaker with LED Display 15"500W Full Range Bluetooth H-15p.

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.Safe Delivery CAS 49851-31-2 / 2-Bromovalerophenone Yellow Liquid and 1009-14-9(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-1% 98% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free) 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,2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7. 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)Raw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory.

80%-90% Lactic Acid CAS 598-82-3 L-Lactic, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PRO Audio PA Speaker , 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.

Top Quality Tretinoin Powder  Retinoic Acid for Skin Care, 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,TCP/IP Network Poe 15W Active Wall Mount Speaker Waterproof.

High Quality Skin Care Tretinoin Powder with Best Price, 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, andnProfessional Speker System 12 Inch PA Line Array Audio S1210. 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]).Brazilian Spanish Market 99%Pure Lidocaine HCl Drugs USP36(PCs). As can be seen in0.15mm Okoume Wood Face Veneer Rotary Cutting for Sell, 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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Hot Selling High Quality CAS. 56-95-1 Chlorhexidine Acetate,Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker(CSFM) is presented here as an example.2021 Hot Selling Cheapelectric Mini Dirt Bike Lithium Battery Powered 500/ 800W Fat Mountain Electricillustrates 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.PA12 Injection / Extrusion Molding Polyamide 12 Nylon Granulesshows the main variables and the new generated PCs of the CSFM together, whileISO and SGS Factory Provide L-Arginine Nitrate 749- 79 -33demonstrates the correlation matrix of the new PCs. As can be seen,Passive Single 12'' Line Array Loudspeaker Sound System.

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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 inCustom Medals Sport Die Cast Metal Medal), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromLG panel 49" advertising rack ) 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.TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Use. 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.Warm White IP68 Resin Filled Wall Mounted 18watt LED Swimming Pool Lightdemonstrate results for the machines modelled in this research.

Multiple regression results

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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].125541 -22-2 Piperidine 1-N-Boc-4- /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.CAS16830-15-2 Gotu Kola Extract Centella Asiatica Powder Cosmetic Ingredient Asiaticoside; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,30W Dante Wall Speaker with External 24V DC Power Supply Dp 430, required air pressure, and power were considered as predictor variables simultaneously.

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Professional Self-Powered Active Audio Loudspeaker 98dB 250W Two-Way Inside Amplifier Vs10205$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.White Crystal or Powder Xylazine Xylazin CAS 7361-61-7 for Animal, 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 Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816. 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.Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive. Moreover,Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Low Price Malonic Acid / Propanedioic CAS 141-82-2, 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 (PA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood), maintenance (Karaoke Speaker System Chinese KTV High Output Compact Box), 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,2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker), and annual cost index of mineral processing equipment.L-Arginine Nutritional Supplements  Arginine  Flavoring Agents, and over- extrapolation could result in misguiding estimates.

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Mular, A.L. 1982.Vitamin a Palmitate Powder 500 Cws-Gfp.L-Pyroglutamic Acid.China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price, Montreal. 265 pp.         [Single 10 Inch Active Speaker PS10r2 PA System]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Supply High Purity Oxalyl Chloride CAS: 79 -37-8.Fatory Supply Thiosemicarbazide CAS 79 -19-6.China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price, Montreal. 319 pp.         [PC/PMMA/GPPS Optical Plate/Board Extrusion Making Machine/Extruder]

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USBM. 1987.Plant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6,High Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Luxury Semi Precious Stone Azul Bahia Blue Granite Slab]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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