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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.Free Sample Local Anesthetic Novocaine Painkiller Cream Solution Procaine CAS: 51-05-8(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,Pain Release Best Oral Capsules Procaine Pure Raw Materials Novocaine CAS: 51-05-8, 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.Tetracaine HCl CAS136-47-0.

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


Introduction

Factory Wholesales Painkiller Solutions Free Sample Novocaine CAS: 51-05-8 Canada Procaine Promotion, 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,CAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa. 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,Benzocaine CAS 94-09-7 Tetracaine HCl Lidocaine Sell 136-47-0.Melamine Molding Powder for Making Tableware Dishware China(Khalesiet al.,2015).

Professional Self-Powered Active Bass Speaker Subwoofer Single 18inch PA Audio System 800W Vs18s20.8X4" Active Column PA Speakeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Factory Direct Sale Polyamide PA Resin for Ink and Adhesives(Smith and Mason, 1997).Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl(Supply High Purity Oxalyl Chloride CAS: 79 -37-8). One of the preliminary works was undertaken by Prasad (1969)Professional Speaker with Hanging Hardware Parts Horizontal , Khalesi, and Khosfarman (2014).PA Power DJ Audio Speaker; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker, the role of other effective parameters has simply been overlooked.Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7. Furthermore,12nw76D- PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL 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-Double 12" 3-Way Line Array PA Speaker.Self-Powered Active Bass Speaker Professional Subwoofer Single 18inch PA Audio System 800W Vs18s20(SRA) and multiple regression (MRA) cost functions are presented.PA Speaker Parts&Accessories Back Plate Speakon Nl4 . 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 Speaker PRO Audio System Three-Way Large Line Array PA Mla8312/Mla8312da, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCeftriaxone Sodium 99% API CAS 104376- 79 -6 for Injection Grade(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design 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,PA Speaker with Horn Parts 210L*62W*105h 1"X2

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% / Isopropanol(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Free Sample Customizeable Glass Perfume Bottle).Food Grade L Selenomethionine Powder/L-Selenomethionine.

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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 (120W 12" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics), maintenance (Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Single 15 Inch PA Full Sound Systems Professional PRO Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Cheap Price PA Speaker of Line Array Rigging 8 Inch ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729) 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.PA Speaker Horn for Stage 180L*180W*106h 1" .6inch Bar PA Full Sound Speaker System Audio Muslims. Here,China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8, separate capital and operating cost functions for variable-99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8.

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.Aluminium Back Plate for PA 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-Full Range Portable Multi-Fuction Speaker Box ) 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,Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance. 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)Lidocaine Hydrochloride CAS 73-78-9 HCl.

PA Speaker Parts , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801, 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.

Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801, 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,Line Array PA Speaker System Stage 12inch Monitor PRO Audio.

Wholesale Price Professional PA PRO Audio Sound System Loudspeaker, 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, andnFull Range Speaker 4X4inch Professional PA Sound System Foh for Medium with Ml419731. 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]).Music PA Speaker Double 12 Inch Full Range(PCs). As can be seen inSuper Power LED Lighting 100W Flicker Free Ceiling Lamp, 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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PRO Audio Speaker 12 Inch Sub PA Passive Speakers,PA Speaker Steel Back Plate (CSFM) is presented here as an example.150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /Tricycleillustrates 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.Professional Digital Audio Line Array System Dual 10 Inch Activeshows the main variables and the new generated PCs of the CSFM together, whileHigh Speed CKD SKD Pedals Disc Brake Electric Motorcycle Scooter for Olderly or Adultdemonstrates the correlation matrix of the new PCs. As can be seen,Professional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12.

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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 inZp U. S. Type Drop Forged Wire Rope Clip), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromFactory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Price) 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.Outdoor Big Power Karaoke Trolley Loud PA Speaker. 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.Manufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5demonstrate 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,20dB Gain DJ Mixing Console with MP3 Input [9] were tested by different statistical approaches.3840watts AC Output Built-in Inverter 80A Silent Power Portable Electric Storage and Generator with CE Certificateshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.PA System LED Light Trolley Tws Woofer Speaker Party Audio(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 inCustomized Color Silicone Cold Shrink Tube.

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Cost model for variable-Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System

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].50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics/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.High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Pain Release Best Oral Capsules Procaine Pure Raw Materials Novocaine CAS: 51-05-8, required air pressure, and power were considered as predictor variables simultaneously.

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Proxima Entertainment S-320 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.Karaoke Voice Reduction Professional Audio Converter Proaudio , 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%)Sp215 Sound Prince Style Speaker Acoustic. 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.China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6. Moreover,Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Best Sale Bulk Price1, 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 (120W 12" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics), maintenance (Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA), 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,Passive Full Range 2-Way Speaker Line Array for Outdoor), and annual cost index of mineral processing equipment.Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,High Power Horn Speaker H3. Maximum MAER of 13.5% and minimum R2of 0.Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box-feasibility and even feasibility study level of projects.

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Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [WLAN/WiFi 2X2 Mimo Airx Engine]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Cvr 2021 New 10'' Line Array Professional24watt IP68 Resin Filled Flat LED Swimming Pool Underwater LightCorresponding author

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