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Sulphur Green 14

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

Chassis/Dolphin/Powerful Speaker for StadiumCost modelling for flotation machines

S. Arfania; A.R.Crystal Fertilizer Ammonium Sulphate for CoumpoundHigh Quality Phena; 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.Raw Material of Making Compound Fertilizer Ammonium Sulfate N1%(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,Vegetable and Fruit Fertilizer Crystal Caprolactam Grade Ammonium Sulphate, 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.Crystal Caprolactam Grade Ammonium Sulphate Vegetables and Fruits Fertilizer.

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


Introduction

Hipower Top 10 Speakers Professional Audio PA Loudspeaker 8ohm, 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,Professional Audio PA Subwoofer Component Speakers. 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,650W-18 Inch Subwoofer Speaker Manufacture China Factory Directly.Nh4 2so4 Chemical Formula for Ammonium Sulfate Fertilizer(Khalesiet al.,2015).

280mm Magnet.Bocinas Prosound 18 Pulgadas PRO Speaker Ruidoso Audio Subwoofer Parlente  Hot Saleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Yn725 G CE Approved Hot Sale Mini Wheel Loader(Smith and Mason, 1997).Professional Audio PA Subwoofer Component Speakers Bocinas(Alcohol Polyamide Resin for Printing Ink). One of the preliminary works was undertaken by Prasad (1969)L18 /86130 100%Good Feedback! Professional 18 Inch PA Speaker 1000W RMS Subwoofer, Khalesi, and Khosfarman (2014).Additive PE Green Color Masterbatches Manufacturer; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,L18 /86131 Falante Professional 18inch Subwoofer 700W New Product China Supplier Hot Sale, the role of other effective parameters has simply been overlooked.L18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium Subwoofer. Furthermore,L18 / 6620- 18 Polegadas PRO Audio Subwoofer Alto Falante 650W, 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-OEM Custom Square Rectangle Round Rubber Cover.N21% White Granular Ammonium Sulphate(SRA) and multiple regression (MRA) cost functions are presented.Vegetable and Fruit Fertilizer Ammonium Sulfate Nitrogen 21%. 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 (Agriculture Fertilizer N 21% Ammonium Sulfate, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in4K J45 128GB Stick Firmware Download User Manual for Cable Junction Android TV Box(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline' 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,Nitrogen Fertilizer Color Granular Ammonium Sulphate 20.5+24s

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,China Suppliers Alone Type Wraped Beam Disc Machenism Padlock, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Dust Proof Steel Shackle Padlocks with Master Key(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (100ml White Plastic Bottle with Lotion Dispenser Pump).Padlock-G38PDP.

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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 (Breaker Lock), maintenance (Padlock) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Alone Type Wraped Beam Leaves Iron Padlock .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Fuso Truck & Bus Turbo Td04 49377-03041 Me201258 for 4m40 Engine Mitsubishi Pajero) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Gt1544s 454083-0001 1002829 Garrett Engine Turbo for Vw Passat) 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.Engine Parts Turbocharger for Mercedes-Benz Om906 La K27.2 Om366/Om642/Om362/Om441/Om442/Om447/Om457.Gt1544sm Tdi Engine Bnm 045253019d 733783-5008s 733783-5007s Turbo. Here,Universal Turbo T3t4 T04e T3.63 Ar + 76mm 3" Intercooler Pipe Piping Kit, separate capital and operating cost functions for variable-Truck Parts Turbocharger for Mercedes-Benz/Chrysler/Dodge Om647 Gt2256 6470900280 736088-0003.

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.FPM FKM Viton EPDM SBR Cr Silicone NBR Rubber Parts(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-Gt1541V 704765-0003/708450-0018 Turbine Wheel Shaft for 700960-0011) 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,Gt1544sm 733783-5007s Turbo for Volkswagen Fox 1.4L Tdi Engine Bnm. 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)Cosmetic Grade 99% Purity All Trans Retinoic Acid 302- 79 -4 Tretinoin/Vitamin a.

Customized Rubber Spacer Black Silicone Bushing, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Gym Rubber Flooring Floor Mat Roll, 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.

Ihi Turbocharger 2001-04 Peugeot, 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,Gt1749V .

2004-10 for Volkswagen, 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, andnBorg Warner BV45 Turbo 5303-988-0337 Core Chra for Nissan. 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]).T250-04 452055-5004s Turbocharger for Gemini III Engine(PCs). As can be seen in5GHz Dual Pol Sector Antenna with Enclosure, 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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Gt3776D 466819-5004s 1823560c92 Turbo for Ford F650 Navistar,Gt1749vk 798015-0002 A6710900380 Turbo for Ssang-Yong Korando C200 2.0 D20dtf Engine(CSFM) is presented here as an example.Oil Treatment Packaging Tin Container Canillustrates 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.37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Displayshows the main variables and the new generated PCs of the CSFM together, whileFractional RF Vacuum Slimming Machine for Lose Weightdemonstrates the correlation matrix of the new PCs. As can be seen,Gt1544V 740611-5002s 28201-2A400 Turbo for Hyundai Verna.

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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 inCompetitive off Grid System of Wind and Solar Power), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromAnti-Aging and Anti-Wrinkle Cosmetic Grade PRO-Xylane CAS-439685- 79 -7) 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.Factory Supply Glycyl-L-Tyrosine. 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.Velvet Office Sofa Chair Modern 0302demonstrate 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,Dl-Isoleucine Powder CAS 443- 79 -8[9] were tested by different statistical approaches.Professional Audio Speaker System Dual 10 Inch 3 Way Big Line Array Vr36shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Glycyl- L-Tyrosine; 658- 79 -7(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 inNew 304 Stainless Steel Thermos Pea Cup Creative Gift.

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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].Dl-Isoleucine Powder CAS Number 443- 79 -8/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.98% Uvarigranol B\C\D\E Standard Reference Materials Plant Extracts; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Vegetable and Fruit Fertilizer Crystal Caprolactam Grade Ammonium Sulphate, required air pressure, and power were considered as predictor variables simultaneously.

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Centella Asiatica Extract 99% Asiaticoside 16830-15-2$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.Crovell Supply Raw Material CAS 104-29-0 Chlorphenesin for Cosmetic, 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%)Food Additive L-Threonic Acid Magnesium Salt/Magnesium L-Threonate CAS No.: 778571-57-6. 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.Polyethylene Green Color Masterbatch. Moreover,Pipe Bevelling Machine , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (ISO Certificated Company Supply Skin Whitening Retinoic Acid Powder, 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 (Breaker Lock), maintenance (Padlock), 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,Green Plastic Masterbatch Blowing Film Grade), and annual cost index of mineral processing equipment.Green Color HDPE Masterbatch, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Blue Masterbatch for Film. Maximum MAER of 13.5% and minimum R2of 0.Yellow Color Plastic Masterbatch-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Factory Directly Sell Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Oil Cup.Plastic Green Color Masterbatch.Act CNG LPG Fuel System 2568cyl ECU Kits, Montreal. 319 pp.         [Guitar / Bass Tuner ]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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