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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.Act MP 48 ECU Switch/Act 2568d Switch(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,Fuel Gas Cylinder ECU 2568d Map Sensors, 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.Motorcycle Act 2568d 6cyl 8cyl ECU Conversion Kit.

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


Introduction

Auto Vehicle Gas Conversion Kit CNG Seqential Injection Kits, 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,Electric Pipe End Bevelling Machine. 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,T-Electric Pipe Bevelling Machine .Pneumatic Pipe Beveling Machine High Performence(Khalesiet al.,2015).

Act CNG LPG Fuel System 2568cyl ECU Kits.Factory Directly Sell Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Oil Cupet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 200kw Grid Tied Solar System for Factory Use(Smith and Mason, 1997).Plastic Green Color Masterbatch(Professional DJ Line Array Sound Speakers DSP Powered Loudspeaker Amplifier). One of the preliminary works was undertaken by Prasad (1969)4 Cyl CNG Auto Gas LPG Conversion Kit / Sequential Injection System, Khalesi, and Khosfarman (2014).3cyl 4 Cyl 6cyl 8cyl LPG/CNG Injector Rail; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,L Auto Gas LPG Conversion Kit / Car 4 Cyl Sequential Injection System, the role of other effective parameters has simply been overlooked.High Quality Diesel Engine Parts 4 Cyl Pump Rotor Head 096400-0371. Furthermore,Diesel Engine Parts Injection System Nozzle Dnopd619, 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-Supply API 99%Min Dalbavancin CAS 171500- 79 -1 Raw Material Powder.Diesel Engine Parts Fuel System Nozzle Dlla145pn574(SRA) and multiple regression (MRA) cost functions are presented.Master Batch Organic Colors. 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 (Orange Color Masterbatch, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory Price Ammonium Sulfate for Crystal Compound Fertilizer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Plastic Purple Color Masterbatch' 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,Cosmetic Raw Material 99% Retinoic Acid 302- 79 -4

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,ISO and SGS Factory Provide L-Arginine Nitrate 749- 79 -33, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Quality Gentisic Acid CAS No.: 490- 79 -9 with Fast Delivery(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (New Design Bluetooth Speaker Remote Control Night Projector).Factory Provide Top Quality L-Carnitine Fumarate 99% 90471- 79 -7.

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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 (Health Raw Material L-Carnitine Fumarate CAS No.: 90471- 79 -7 with High Quality), maintenance (Sports Nutrition L-Carnitine Fumarate High Purity Raw Material Powder CAS 90471- 79 -7) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Best Price Bulk Powder Retinyl Palmitate 79 -81-2.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Nutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Delivery) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Health Raw Material L-Carnitine Fumarate CAS.: 90471- 79 -7) 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.Diesel Engine Parts Fuel Injection Nozzle Dlla152sm043.Diesel Engine Parts Fuel Injection Nozzle Dlla156sm139. Here,Diesel Engine Parts Fuel Injection Nozzle 152sn924, separate capital and operating cost functions for variable-Auto Engine Diesel Parts Fuel Injector Common Rail Nozzle Dlla162p2266.

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.Diesel Engine Parts Fuel Injection Nozzle Dlla156s820(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-Tws Bluetooth Earphones with Charging Cases Wireless 5.0 Earbuds Headphones for iPhone) 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,Diesel Engine Parts Fuel Injection Nozzle 150sn902. 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)Tws Sport Headset Stereo Headphone Earphone with Charging Box Black.

3D Stereo Sound Mini Headphone Built in Microphone & Dual Speakers for Phone Calls, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (New Products Charging Case Mini Small Headphones Tws Earbuds Wireless 2021, 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.

Transparent Nylon 12 Resin Raw Material Polyamide Granules, 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,PA12 Natural Resin Transparent Granules Pellets Polyamide Price.

PA12 Plastic Granule for Injection Molding Polyamide 12 Resin Nylon, 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, andnPA12 Injection / Extrusion Molding Polyamide 12 Nylon Granules. 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]).Nylon 12/Nylon Granules/Polyamid 12/Transparent Glasses Frame(PCs). As can be seen inProfessional Line Array PA System S1210 Sound, 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.150cc Motorcycleshows the main variables and the new generated PCs of the CSFM together, while9L Tight Head Tin Can with Tap for Oilve Oil Ink and Paintdemonstrates the correlation matrix of the new PCs. As can be seen,2021 Hot Selling Good Performance Transparent PA12 Granules / Ployamide 12 for Commercial Installation.

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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 in4 Feet Chipper Debarker/Wood Log Debarking and Rounding Machine for Plywood), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromPour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouth) 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.Transparent Nylon Grilamid PA -7290 Material a Kind of Amorphous PA12. 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 Adhesion Polyurethane PU Resin for Printing Inkdemonstrate 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,Ce Certification Plastic Water Bottle Use Yellow Masterbatch[9] were tested by different statistical approaches.Sector Antenna 5GHzshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Sliding Mechanism(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 inHigh Quality Round Bamboo Sticks for Making Incense.

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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].Professional Carbon Black Masterbatch Factory for Rubbish Bag/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.PE Green Color Masterbatches Supplier in China; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Fuel Gas Cylinder ECU 2568d Map Sensors, required air pressure, and power were considered as predictor variables simultaneously.

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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.Diesel Engine Parts Fuel Injection Nozzle Dlla160sn567. Moreover,Diesel Engine Parts Fuel Injection Nozzle Dlla160s325n507, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Diesel Engine Parts Fuel Injection Nozzle Dlla150sm145, 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 (Health Raw Material L-Carnitine Fumarate CAS No.: 90471- 79 -7 with High Quality), maintenance (Sports Nutrition L-Carnitine Fumarate High Purity Raw Material Powder CAS 90471- 79 -7), 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,PA12 Transparent Polyamide with Anti-UV Granules), and annual cost index of mineral processing equipment.PA12 Resin Suppliers Glass Fiberpolyamide 12 Nylon Granules, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Diesel Engine Parts Fuel Injection Nozzle Dlla150sm105. Maximum MAER of 13.5% and minimum R2of 0.Grade Uns N08330 Stainless Steel Rod-feasibility and even feasibility study level of projects.

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Lashgari, A.904L Uns N08904 SUS890L 1.4539 ASTM-A240 Stainless Steel Round Square Hex Flat Angle Channel Rod/Bar, A.R. 2013.Hot Sale Five Star Hotel Standard Soaking Oval Shaped Size Whirlpool Bathtubs Standing Alone Acrylic Bathtub #S014,1.4828 S30900 309 0cr23ni13 Uns DIN JIS SUS309 Stainless Steel Round Pipe Tube,vol. 23. pp. 441-446.         [3D Wheel Alignment with Large Screen Wld-Ae306 for Sale]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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