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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

Plastic PVC CPVC UPVC Sewage/ Pressure Pipe& Electrical Conduit Cable Pipe/Tube /Single Corrguated Pipe Cost modelling for flotation machines

S. Arfania; A.R.Single 15 Inch PA Full Sound Systems Professional PRO SpeakerOutdoor Dual 10 " Three Way Line Array Professional Audio Speaker System; 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.Cheap Price PA Speaker of Line Array Rigging 8 Inch (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,Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729, 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.PA Speaker Horn for Stage 180L*180W*106h 1" .

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


Introduction

6inch Bar PA Full Sound Speaker System Audio Muslims, 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,China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8. 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,99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8.Aluminium Back Plate for PA Speaker (Khalesiet al.,2015).

Full Range Portable Multi-Fuction Speaker Box .Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearanceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Macassar Ebony Veneer Decorative Reconstituted Wood Veneers for Furniture Plywood HPL Door Skin(Smith and Mason, 1997).Lidocaine Hydrochloride CAS 73-78-9 HCl(5f-Pcn CAS No. 1445579- 79 -2 in Stock). One of the preliminary works was undertaken by Prasad (1969)PA Speaker Parts , Khalesi, and Khosfarman (2014).Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801, the role of other effective parameters has simply been overlooked.Line Array PA Speaker System Stage 12inch Monitor PRO Audio. Furthermore,Wholesale Price Professional PA PRO Audio Sound System Loudspeaker, 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-Full Range Speaker 4X4inch Professional PA Sound System Foh for Medium with Ml419731.Music PA Speaker Double 12 Inch Full Range(SRA) and multiple regression (MRA) cost functions are presented.PA Column Speaker Empty Alu. Cabinet 4.5" . 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 (PRO Audio Speaker 12 Inch Sub PA Passive Speakers, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in4 Stringed Wrapped Electric Bass Guitar Strings(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PA Speaker Steel Back Plate ' 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,PA System LED Light Trolley Tws Woofer Speaker Party Audio

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Crown Bear Fashion Jewelry Brooch).High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers.

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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 (K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets ), maintenance (12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Proxima Entertainment S-320 Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Karaoke Voice Reduction Professional Audio Converter Proaudio ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Sp215 Sound Prince Style Speaker Acoustic) 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.China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6.Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker . Here,Best Sale Bulk Price1, separate capital and operating cost functions for variable-Passive Full Range 2-Way Speaker Line Array for Outdoor.

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.Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse(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-High Power Horn Speaker H3) 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,Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box. 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)Levamisole Hydrochloride CAS 16595-80-5 in Stock.

Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606, 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.

2.4GHz Wireless Ceiling Speaker PA System, 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,OEM ODM Public DJ PA Wooden Speaker.

Double 12" Line Array 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, andnFeiyang 2X6" Private Battery Bluetooth Speaker Fg206-01. 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]).PA Speaker with Single-Point Angles Regulator (PCs). As can be seen inWf7021A 2.4G 600Mbps 5g 1.2gbps Dual Band 4 Antennas WiFi 6 Router, 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.Newest 250cc Farm UTV 200cc Go Kart Buggy with Ceshows the main variables and the new generated PCs of the CSFM together, whileCosmetic Grade L-Arginine with High Qualitydemonstrates the correlation matrix of the new PCs. As can be seen,CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%.

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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 in100-2000mm Sewer Inspection Camera Pipe Periscope Made in China), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromJwell HDPE Waterproof Membrance Roll Extrusion Line) 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.Pharmaceutical Intermediate Bulk Price N- . 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.Pendoo X10 Max Amlogic S905X3 Android TV Player World IPTV Video Box Support IR /2.4GHz Wireless Mobile Remote Controldemonstrate 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,Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supply[9] were tested by different statistical approaches.China Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand(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 inOriginal LED TV 4A 50 Inch Smart Large Memory Full HD Television.

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Cost model for variable-Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl

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].Speaker System High Power H3/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.CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729, required air pressure, and power were considered as predictor variables simultaneously.

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Proxima Entertainment Z-450 Digtal 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.Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500, 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%)Lat210A Srx700 Series PA Sound System Professional Speakers. 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 Public Address Mini Onwall Line Array Speaker . Moreover,Q1--Dual10 Inch Line Array Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (12inches PA Speaker Audio Component, 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 (K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets ), maintenance (12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage), 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,Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth), and annual cost index of mineral processing equipment.Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Power Amplifiers PA Speaker System Amplifier 1000 Watt. Maximum MAER of 13.5% and minimum R2of 0.Wholesales Organic Intermediate 1-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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