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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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Best Selling Modern Design Living Room Classic Leather Recliner Massage Chinese Home FurnitureCost modelling for flotation machines

S. Arfania; A.R.Kas 12 Inch Line Array Audio Professional DJ Speakers 18 SubwooferNo Flicker Glare Pool LED Light Wnderwater Waterproof RGB Wall Mounted Swimming Lamp with Edison Chip; 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.Qg-12-12 Inch Professional Full Range PRO Audio Speaker Box(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,Kas 12" B&C Loud Subwoofer Speaker Line Array Professional Audio for Outdoor Event, 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.High Power Two-Way Full Range PRO Audio Speaker Box System.

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,30W Dante Wall Speaker with External 24V DC Power Supply Dp 430. 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,Kas 12 3 Way Sound System Line Array PRO Speakers with Subwoofer.Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer(Khalesiet al.,2015).

Rental Application Stage Monitor Audio&Sets.Local Anesthetic Levobupivacaine Powder Brazil Free Sample 27262-48-2et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Eougem Zl-08 0.8 Ton Chinese Mini Radlader Manufacturer 0.45m3 Bucket Loader(Smith and Mason, 1997).Top Quality Cosmetic Raw Material Chlorphenesin CAS 104-29-0  for  Antiseptic(Alcohol Solvent Polyamide Resin for Gravure Plastic Ink). One of the preliminary works was undertaken by Prasad (1969)White Crystalline Powder Painkiller Levobupivacaine Skin Surface Anesthesia CAS: 27262-48-2, Khalesi, and Khosfarman (2014).Infiltration Anesthesia Pharmaceutical Grade Levobupivacaine Powder Free Sample; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Top Local Anesthetic Manufacturer Levobupivacaine CAS: 27262-48-2 Wholesales UK, the role of other effective parameters has simply been overlooked.99.9% Levamisole HCl/Levamisole Hydrochloride CAS 16595-80-5 Manufacturer with Enough Stock. Furthermore,Food Grade Vitamin a Oil Palmitate 1.7million Units. CAS79-81-2, 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-Rimonabant Powder Weight Loss Factory Direct Supply.Top Local Anesthetic Supplier Marcaine Injection 14252-80-3 Bupivacaine Powder(SRA) and multiple regression (MRA) cost functions are presented.High Quality Procainamide Hydrochloride 614-39-1. 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 (Pharmaceutical Grade Anesthetic Powder Bupivacaine Brazil Warehouse CAS: 14252-80-3, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFood Grade L Selenomethionine Powder/L-Selenomethionine(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PA Horn Loaded Speaker Professional Loudspeaker' 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,Big Discount 99% Glycocyamine Supply Guanidineacetic Acid 352-97-6

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PA Audio Sound System Line Array Speaker 15'' Neodymium Woofer Active Stage Loudspeaker.(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Electric Hoist 110V).Mixer Power Amplifier with USB.

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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 (Powered Line Array Active Stage Speaker), maintenance (PRO Audio Loudspeaker PA Speaker System Coaxial Compact Line Array) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PRO Audio Loudspeaker PA Speaker System 12&Rdquor & 15&Rdquor Line Array.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (PA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Karaoke Speaker System Chinese KTV High Output Compact Box) 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.Coaxial Speaker TD10.Professional Sound System Effects for Equipment Hire . Here,PA System 30W Waterproof Plastic Driver Unit for Horn Speaker with Stainless Steel Screw Outdoor Use, separate capital and operating cost functions for variable-Outdoor Show Audio Lt12 Passive Line Array Speaker System.

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.Karaoke Microphone Bluetooth Sound Mixer Video Conference(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-Outdoor Speaker Professional Audio Factory) 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,Active Speaker with LED Display 15"500W Full Range Bluetooth H-15p. 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)Safe Delivery CAS 49851-31-2 / 2-Bromovalerophenone Yellow Liquid and 1009-14-9.

1% 98% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7, 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.

Raw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory, 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,80%-90% Lactic Acid CAS 598-82-3 L-Lactic.

PRO Audio PA Speaker , 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, andnTop Quality Tretinoin Powder  Retinoic Acid for Skin Care. 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]).TCP/IP Network Poe 15W Active Wall Mount Speaker Waterproof(PCs). As can be seen inHigh Quality Karaoke Loudspeaker with B&C Compression Driver, 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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Professional Speker System 12 Inch PA Line Array Audio S1210,Brazilian Spanish Market 99%Pure Lidocaine HCl Drugs USP36(CSFM) is presented here as an example.10MHz Linear Vascular/Anesthesia Portable Wireless Ultrasound Scannerillustrates 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.China Hot Sale Single Phase Variable Frequency Inverter 1.5kw 220Vshows the main variables and the new generated PCs of the CSFM together, whilePortable-Rorary Type DOT Peen Marking Machine for Metaldemonstrates the correlation matrix of the new PCs. As can be seen,Eco SIP System 30W Waterproof PA Wall Speaker with Digital Power Amplifier Connect to Poe Switch.

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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 inProfessional Sea Shipping LCL Service), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from43" Dual Screen LCD Ad Player Full HD Double Display All in One No Touch Android Advertise System) 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.Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker. 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.High Quality Ammonium Dibutyl Dithiophosphate 95%demonstrate 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,Passive Single 12'' Line Array Loudspeaker Sound System[9] were tested by different statistical approaches.Hot Selling Headset Bluetooth Wireless Headphone with Charger Caseshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.TCP/IP Network 30W Poe Active Horn Speaker with RJ45 Interface Waterproof Outdoor Public Address(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 in305mm Titanium Ultrasonic Cutting Equipment.

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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].99% Proparacaine Hydrochloride / HCl CAS 5875-06-9/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 Speaker PRO Audio System Compact Line Array PA Lq10; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Kas 12" B&C Loud Subwoofer Speaker Line Array Professional Audio for Outdoor Event, required air pressure, and power were considered as predictor variables simultaneously.

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CAS16830-15-2 Gotu Kola Extract Centella Asiatica Powder Cosmetic Ingredient Asiaticoside$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.Blended Powder Oil Liquid Ripex 225 for Muscle Growth, 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%)Good Effect for Treating Infertility in Women Clom CAS: 911-45-5. 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.Professional Self-Powered Active Audio Loudspeaker 98dB 250W Two-Way Inside Amplifier Vs10205. Moreover,White Crystal or Powder Xylazine Xylazin CAS 7361-61-7 for Animal, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (professional Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816, 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 (Powered Line Array Active Stage Speaker), maintenance (PRO Audio Loudspeaker PA Speaker System Coaxial Compact Line Array), 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,Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive), and annual cost index of mineral processing equipment.Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Low Price Malonic Acid / Propanedioic CAS 141-82-2. Maximum MAER of 13.5% and minimum R2of 0.2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker-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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