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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

China Factory Supply Ethylmagnesium Bromide CAS 925-90-6Cost modelling for flotation machines

S. Arfania; A.R.24V Engine Interface Controller Module Eim Plus 258 -9756 for Fg Wilson GeneratorISO Certified 100% Natural L-Arginine Powder; 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.Medrogestone Top Quality Low Price 977- 79 -7(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,Factory Supply High Quality Ademetionine 1, 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.China Supplier 1.

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


Introduction

Cosmetic Grade CAS 79 -14-1 Glycolic Acid Powder, 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: 79 -44-7 Dimethylcarbamoyl Chloride . 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,Diesel Engine Eim630-465 12V Eim630-466 24V 258 -9755 PCB650-091 650-092 Generator PCB Controller Panel Circuit Board Interface Module Speed.Kinetin; CAS No: 525- 79 -1; 6-Furfurylaminopurine; 6-Kt(Khalesiet al.,2015).

Good Quality CAS: 97240- 79 -4 Topiramate Powder Price.High Purity 99% Intermediate 1et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for China 250cc New 3 Wheel Motorcycle Motor Tricycle(Smith and Mason, 1997).Yinherb Supply Pharmaceutical Raw Materials CAS 977- 79 -7 Medrogestone Powder(Llantas High Quality L5 OTR Tyre 26.5-25). One of the preliminary works was undertaken by Prasad (1969)High Quality Tretinoin with Good Price , Khalesi, and Khosfarman (2014).Cosmetic Raw Material CAS 20449- 79 -0 Extract Powder Bee Venom Melittin; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Fg Controller Generator Engine Interface Module Eim Basic MK3 258 -9755, the role of other effective parameters has simply been overlooked.High Purity Organic Intermediate  1. Furthermore,Generator Interface Module Eim Basic 258 -9753 for Fg Wilson Engine, 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-Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control.Engine Interface Model Eim 630-465 630-466 630-088 Olympian Massey Module Replace Fg Wilson Speed Controller 258 -9753 -9755 12V 24V(SRA) and multiple regression (MRA) cost functions are presented.Diesel Engine Set Wilson Parts Eim Module Interface C3.3 C4.4 Motorcycle Generator Auto Spare 258 -9753 -9755 12V 24V. 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 (5kw 10kw Stc Three Phase AC Synchronous 15kw Brush Alternator, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMulti Birch Veneer Plywood Manufacturer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Replace Fg Wilson Engine Interface Module Eim Plus Basic 258 -9755 -9753' 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,China Supplier 1

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,100% Copper Wire Stc Series Three Phase AC Dynamo/Generator /  Alternator , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Stc-3 3kw Stc-5 5kw Stc-10 10kw Three Phase Alternator(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Hot-Selling Conch 80 Series PVC/UPVC Sliding Door PVC Profile with Domestic Hardware).24kVA St Series Single Phase Generator .

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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 (20 Days Delivery! 100% Copper Wire Stc-3kw Three Phase Alternator), maintenance (20kVA St Series Single Phase Generator ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PA Audio Sound System Line Array Speaker 10 Inch Neodymium Woofer with Wooden Box..076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (7.5kVA St Series Single Phase Generator ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Wholesale 8inch 10inch 12 Inch 15inch DJ Speakers Professional Stage Audio) 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.2 Way Passive 10 " Professional PRO Audio PA Line Array.Stc Series Three Phase Dynamo Generator . Here,China Factory Price CAS 302- 79 -4 Tretinoin / Retinoic Acid Vitamin a Powder, separate capital and operating cost functions for variable-Stc Series Three Phase Dynamo Generator .

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.CAS: 74- 79 -3 Amino Acid L-Arginine(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-Glycolic Acid Cosmetic Grade CAS 79 -14-1 /a-Hydroxyacetic) 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,St-10kw/kVA Single Phase Brush Type Electric Generator. 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)Stc-50kw/62.5kVA Three Phase AC Brush Alternator for Diesel Generator.

Veterinary Use Bulk Pirce of Oxytetracycline CAS: 79 -57-2, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (100% Copper Wire St-7.5kw Single Phase Alternator Factory Price, 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.

100% Copper Wire St-5kw Single Phase Brush Generator, 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,Home Theater Speaker.

Dual 6" Coaxial Full Range Speaker for Entertainment Room, 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, andn12inch Stage Monitor Speaker. 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]).KTV Single 8" Full Range Audio&Sets(PCs). As can be seen inWeight Loss Raw Powder Rimonabant with Good Effects 168273-06-1, 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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Stc-12kw/15kVA Three Phase AC Electric Generator on Sale,St 5kw Single Phase AC Electric Alternator Generator(CSFM) is presented here as an example.800W VERA 12 Line Array DJ Speaker Cabinet PRO Audioillustrates 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.Fast Delivery 1-Bromo-3 5-Dimethyladamantane CAS 941-37-7/941 37 7/941377/702- 79 -4/702 4/702794shows the main variables and the new generated PCs of the CSFM together, whileNew Products Factory Price Supply CAS 71277- 79 -7 Disodium Glycyrrhizate in Hot Saledemonstrates the correlation matrix of the new PCs. As can be seen,Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control.

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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 inFanshaped Plastic Appliques), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSingle 15'' Sub Bass to U Series Full Range Speaker) 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 0.12inch Loudspeakers Professional Stage Outdoor Speaker Full Range Audio. 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.Snsck Food Bag Fried Flat Bottom Box Pouch with Zipperdemonstrate 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,Android Digital Signage Intelligent Hand Sanitizer Display[9] were tested by different statistical approaches.Amlogic S905X3 X96 Air 2g 16g Android 9.0 Media Playershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.55 Inch Outdoor Double-Side LCD Display Self Service Airport Kiosk Touch Screen Multimedia Information(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 inLogistics Service FedEx Express From China to Guatemala.

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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].LCD Digital Signage 21.5 Inch Automatic Induction Hand Sanitizer Billboards/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.43" Dual Screen LCD Ad Player Full HD Double Display All in One No Touch Android Advertise System; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Factory Supply High Quality Ademetionine 1, required air pressure, and power were considered as predictor variables simultaneously.

Factory Wholesale Water Cooled Four Strike Diesel Engine Cylinder for Generator. Moreover, the operating cost was detailed in different cost items.10 " Woofer Speaker, indicated inWear-Resistant PU O Ring, and major extrapolation should be avoided.

High Brightness Stand Alone Advertising Kiosk for Government$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.Factory Nitrogen Fertilizer Ammonium Sulphate 20.5%N Steel Grade for Agriculture, 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%)High Speed 258kw 6 Cylinder Industrial Diesel Engine for Electric. 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.21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline. Moreover,Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Water Cooled Diesel Engine Color Custom for Power Generator Set, 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 (20 Days Delivery! 100% Copper Wire Stc-3kw Three Phase Alternator), maintenance (20kVA St Series Single Phase Generator ), 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,Direct Injection Diesel Engine with 6-Cylinder 4-Stroke Used for Electric Generator Sets), and annual cost index of mineral processing equipment.Nitrogen Fertilizers Agriculture N20.5% Granular Ammonium Sulphate, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,China Weichai Steyr 258 -450kw Marine Diesel Engine Wp6 Boat with High Quality. Maximum MAER of 13.5% and minimum R2of 0.White Crystalline Ammonium Sulphate for Compound Fertilizer-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Nitrogen Fertilizer N21% Min Ammonium Sulphate White Granular.Wholesale Ammonium Sulphate with SGS and Coa Certificate.Best Price Fertilizer Ammonium Sulphate N21% Min, Montreal. 319 pp.         [Frequency Inverter Pump AC Drive Price]

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100% Copper Wire St-7.5kw Single Phase Alternator Factory Price, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-in Line Water Cooled Diesel Engine for Generator with Good Quality.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Disodium Phosphate Food Grade Manufacturer]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Sab-500 Ophthalmic a/B Scanner8 Ohm PRO Audio DJ Mixer Live Sound SystemCorresponding author

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