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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

ISO Certified 100% Natural L-Arginine PowderCost modelling for flotation machines

S. Arfania; A.R.Factory Supply High Quality Ademetionine 1Llantas High Quality L5 OTR Tyre 26.5-25; 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.China Supplier 1(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,Cosmetic Grade CAS 79 -14-1 Glycolic Acid Powder, 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.CAS: 79 -44-7 Dimethylcarbamoyl Chloride .

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


Introduction

Diesel Engine Eim630-465 12V Eim630-466 24V 258 -9755 PCB650-091 650-092 Generator PCB Controller Panel Circuit Board Interface Module Speed, 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,Kinetin; CAS No: 525- 79 -1; 6-Furfurylaminopurine; 6-Kt. 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,Good Quality CAS: 97240- 79 -4 Topiramate Powder Price.High Purity 99% Intermediate 1(Khalesiet al.,2015).

Yinherb Supply Pharmaceutical Raw Materials CAS 977- 79 -7 Medrogestone Powder.High Quality Tretinoin with Good Price et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for HDPE PE PPR Pipe Making Machine(Smith and Mason, 1997).Cosmetic Raw Material CAS 20449- 79 -0 Extract Powder Bee Venom Melittin(Multi Birch Veneer Plywood Manufacturer). One of the preliminary works was undertaken by Prasad (1969)Fg Controller Generator Engine Interface Module Eim Basic MK3 258 -9755, Khalesi, and Khosfarman (2014).High Purity Organic Intermediate  1; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Generator Interface Module Eim Basic 258 -9753 for Fg Wilson Engine, the role of other effective parameters has simply been overlooked.Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control. Furthermore,Engine Interface Model Eim 630-465 630-466 630-088 Olympian Massey Module Replace Fg Wilson Speed Controller 258 -9753 -9755 12V 24V, 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-Diesel Engine Set Wilson Parts Eim Module Interface C3.3 C4.4 Motorcycle Generator Auto Spare 258 -9753 -9755 12V 24V.5kw 10kw Stc Three Phase AC Synchronous 15kw Brush Alternator(SRA) and multiple regression (MRA) cost functions are presented.Replace Fg Wilson Engine Interface Module Eim Plus Basic 258 -9755 -9753. 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 (Engine Controller Model Eim Basic 258 -9756, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in5150-5850MHz Sector Panel Antenna 2*17dBi(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Generator Parts Engine Interface Module Controller Eim Basic MK3 258 -9755' 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,Stc-3 3kw Stc-5 5kw Stc-10 10kw Three Phase Alternator

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,24kVA St Series Single Phase Generator , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),20 Days Delivery! 100% Copper Wire Stc-3kw Three Phase Alternator(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Four Wheel Alignment A10/Tire Changer/Garage Equipment/Automotive Equipment/Wheel Balancer/Auto Maintenance/Wheel Machine Price/Wheel).20kVA 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 (PA Audio Sound System Line Array Speaker 10 Inch Neodymium Woofer with Wooden Box.), maintenance (7.5kVA 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,Wholesale 8inch 10inch 12 Inch 15inch DJ Speakers Professional Stage Audio.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2 Way Passive 10 " Professional PRO Audio PA Line Array) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Stc Series Three Phase Dynamo Generator ) 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 Factory Price CAS 302- 79 -4 Tretinoin / Retinoic Acid Vitamin a Powder.Stc Series Three Phase Dynamo Generator . Here,CAS: 74- 79 -3 Amino Acid L-Arginine, separate capital and operating cost functions for variable-Glycolic Acid Cosmetic Grade CAS 79 -14-1 /a-Hydroxyacetic.

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.St-10kw/kVA Single Phase Brush Type Electric Generator(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-Stc-50kw/62.5kVA Three Phase AC Brush Alternator for Diesel Generator) 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,Veterinary Use Bulk Pirce of Oxytetracycline CAS: 79 -57-2. 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)100% Copper Wire St-7.5kw Single Phase Alternator Factory Price.

100% Copper Wire St-5kw Single Phase Brush Generator, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Home Theater Speaker, 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.

Dual 6" Coaxial Full Range Speaker for Entertainment Room, 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,12inch Stage Monitor Speaker.

KTV Single 8" Full Range Audio&Sets, 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, andnSt-2kw 230V/50Hz Single Phase Brush Alternator for Sale. 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]).Stc-12kw/15kVA Three Phase AC Electric Generator on Sale(PCs). As can be seen inHot selling compact 800kgs wheel loader for garden, 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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Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control,258 -9754 Electric Engine Interface Moudle 12V Eim Basic(CSFM) is presented here as an example.Fast Delivery 1-Bromo-3 5-Dimethyladamantane CAS 941-37-7/941 37 7/941377/702- 79 -4/702 4/702794illustrates 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.New Products Factory Price Supply CAS 71277- 79 -7 Disodium Glycyrrhizate in Hot Saleshows the main variables and the new generated PCs of the CSFM together, whileHDPE PE PPR Pipe Making Machinedemonstrates the correlation matrix of the new PCs. As can be seen,12inch Loudspeakers Professional Stage Outdoor Speaker Full Range Audio.

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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 inGradient Color Essential Oil Roller Bottles Rainbow Glass with Stainless Steel Balls 10ml), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromPlywood Mdo / Hdo for Concrete Formwork Slab Form) 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 0.55 Inch Outdoor Double-Side LCD Display Self Service Airport Kiosk Touch Screen Multimedia Information. 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.Amlogic S905X3 X96 Air 2g 16g Android 9.0 Media Playerdemonstrate 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,New Brand Diesel Engine with Four Stroke Multy-Cylinder Used for Generator Set[9] were tested by different statistical approaches.2879 Free Shipping 10kw 12kw 15kw Home Used Solar Power System on Grid Roofshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.LCD Digital Signage 21.5 Inch Automatic Induction Hand Sanitizer Billboards(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 in1500mm Hydraulic Heavy Duty Wood Debarking Machine Made in China.

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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].Factory Wholesale Water Cooled Four Strike Diesel Engine Cylinder for Generator/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.10 " Woofer Speaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Cosmetic Grade CAS 79 -14-1 Glycolic Acid Powder, required air pressure, and power were considered as predictor variables simultaneously.

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High Speed 258kw 6 Cylinder Industrial Diesel Engine for Electric$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 0.21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline, 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%)Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%. 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.Water Cooled Diesel Engine Color Custom for Power Generator Set. Moreover,Direct Injection Diesel Engine with 6-Cylinder 4-Stroke Used for Electric Generator Sets, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Nitrogen Fertilizers Agriculture N20.5% Granular Ammonium Sulphate, 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 (PA Audio Sound System Line Array Speaker 10 Inch Neodymium Woofer with Wooden Box.), maintenance (7.5kVA 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,China Weichai Steyr 258 -450kw Marine Diesel Engine Wp6 Boat with High Quality), and annual cost index of mineral processing equipment.White Crystalline Ammonium Sulphate for Compound Fertilizer, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Deisel Engine for Silent Power Generator with 6-Cylinder. Maximum MAER of 13.5% and minimum R2of 0.in Line Multy-Cylinder Diesel Engine for Power Generator Set-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

8 Ohm PRO Audio DJ Mixer Live Sound SystemHigh-Purity Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol China Factory Direct SalesCorresponding author

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