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Core Face Veneer Cutter
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
Laswim Swim SPA Endless Swimming Pool Whirlpool BathtubCost modelling for flotation machines
S. Arfania; A.R.Ultra Low Nosie 10 Channles Mixer Mixing Console China O-Phthalaldehyde Opa CAS 643- 79 -8 Raw Crystal 643798 Supplier; 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.10''stage professional Audio Speaker H- 10 for Stage(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,42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk, 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 0.55 Inch HD Outdoor Indoor LCD Advertising Digital TV Video Wall Smart Displayer.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Horn Speaker M-776, 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,55 Inch Stand Alone Digital Photo Booth LCD Advertising Display. 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,Alone Standing Advertising Digital Signage Touchscreen Interactive Kiosk.USP Raw Diclofenac Sodium White Powder for Antipyretic Analgesics CAS 15307- 79 -6(Khalesiet al.,2015).
Wilson Parts Eim Module Engine Interface Control 258 -9753.Generator Engine Interface Module Controller Eim Plus 24V 258 -9756 for Fg Wilsonet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Water Proof Closed Box Delivery Tricycle(Smith and Mason, 1997).24V Engine Interface Controller Module Eim Plus 258 -9756 for Fg Wilson Generator(Top Selling Polyurethane Adhesive Resin). One of the preliminary works was undertaken by Prasad (1969)Medrogestone Top Quality Low Price 977- 79 -7, Khalesi, and Khosfarman (2014).Factory Supply High Quality Ademetionine 1; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,China Supplier 1, the role of other effective parameters has simply been overlooked.Cosmetic Grade CAS 79 -14-1 Glycolic Acid Powder. Furthermore,CAS: 79 -44-7 Dimethylcarbamoyl Chloride , 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 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(SRA) and multiple regression (MRA) cost functions are presented.Good Quality CAS: 97240- 79 -4 Topiramate Powder Price. 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 (High Purity 99% Intermediate 1, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inBirch Plywood 2-Way Crossover Passive Loudspeaker (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Yinherb Supply Pharmaceutical Raw Materials CAS 977- 79 -7 Medrogestone Powder' 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,Generator Interface Module Eim Basic 258 -9753 for Fg Wilson Engine
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Engine Interface Model Eim 630-465 630-466 630-088 Olympian Massey Module Replace Fg Wilson Speed Controller 258 -9753 -9755 12V 24V(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (12oz Stainless Steel Double Wall Vacuum Insulated Wine Water Cup Wholesale).Diesel Engine Set Wilson Parts Eim Module Interface C3.3 C4.4 Motorcycle Generator Auto Spare 258 -9753 -9755 12V 24V.
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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 (5kw 10kw Stc Three Phase AC Synchronous 15kw Brush Alternator), maintenance (Replace Fg Wilson Engine Interface Module Eim Plus Basic 258 -9755 -9753) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Engine Controller Model Eim Basic 258 -9756.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Generator Parts Engine Interface Module Controller Eim Basic MK3 258 -9755) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Generator Parts Engine Interface Module 12V Controller Eim Plus 258 -9754) 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.100% Copper Wire St Series Single Phase Generator / Alternator .China Supplier 1. Here,100% Copper Wire Stc Series Three Phase AC Dynamo/Generator / Alternator , separate capital and operating cost functions for variable-Stc-3 3kw Stc-5 5kw Stc-10 10kw Three Phase Alternator.
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.24kVA St Series Single Phase 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-20 Days Delivery! 100% Copper Wire Stc-3kw Three Phase Alternator) 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,20kVA St Series Single Phase 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)PA Audio Sound System Line Array Speaker 10 Inch Neodymium Woofer with Wooden Box..
7.5kVA St Series Single Phase Generator , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Wholesale 8inch 10inch 12 Inch 15inch DJ Speakers Professional Stage Audio, 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.
2 Way Passive 10 " Professional PRO Audio PA Line Array, 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,Stc Series Three Phase Dynamo Generator .
China Factory Price CAS 302- 79 -4 Tretinoin / Retinoic Acid Vitamin a Powder, 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, andnStc Series Three Phase Dynamo Generator . 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]).CAS: 74- 79 -3 Amino Acid L-Arginine(PCs). As can be seen inChina Factory Supply Ethylmagnesium Bromide CAS 925-90-6, 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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St-10kw/kVA Single Phase Brush Type Electric Generator,Stc-50kw/62.5kVA Three Phase AC Brush Alternator for Diesel Generator(CSFM) is presented here as an example.Llantas High Quality L5 OTR Tyre 26.5-25illustrates 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.Multi Birch Veneer Plywood Manufacturershows the main variables and the new generated PCs of the CSFM together, while5150-5850MHz Sector Panel Antenna 2*17dBidemonstrates the correlation matrix of the new PCs. As can be seen,Veterinary Use Bulk Pirce of Oxytetracycline CAS: 79 -57-2.
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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 inDirect Dyes Yellow 10), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from800W VERA 12 Line Array DJ Speaker Cabinet PRO Audio) 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 0.100% Copper Wire St-5kw Single Phase Brush Generator. 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.New Products Factory Price Supply CAS 71277- 79 -7 Disodium Glycyrrhizate in Hot Saledemonstrate 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,Home Theater Speaker[9] were tested by different statistical approaches.HDPE PE PPR Pipe Making Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Dual 6" Coaxial Full Range Speaker for Entertainment Room(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 inDie Cut Lid for Beverage.
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Cost model for variable-12inch Stage Monitor Speaker
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].KTV Single 8" Full Range Audio&Sets/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.St-2kw 230V/50Hz Single Phase Brush Alternator for Sale; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk, required air pressure, and power were considered as predictor variables simultaneously.
Stc-12kw/15kVA Three Phase AC Electric Generator on Sale. Moreover, the operating cost was detailed in different cost items.St 5kw Single Phase AC Electric Alternator Generator, indicated inPlywood Mdo / Hdo for Concrete Formwork Slab Form, and major extrapolation should be avoided.
Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control$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 0.258 -9754 Electric Engine Interface Moudle 12V Eim Basic, 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%)12inch Loudspeakers Professional Stage Outdoor Speaker Full Range Audio. 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.Android Digital Signage Intelligent Hand Sanitizer Display. Moreover,55 Inch Outdoor Double-Side LCD Display Self Service Airport Kiosk Touch Screen Multimedia Information, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (New Brand Diesel Engine with Four Stroke Multy-Cylinder Used for 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 (5kw 10kw Stc Three Phase AC Synchronous 15kw Brush Alternator), maintenance (Replace Fg Wilson Engine Interface Module Eim Plus Basic 258 -9755 -9753), 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,LCD Digital Signage 21.5 Inch Automatic Induction Hand Sanitizer Billboards), and annual cost index of mineral processing equipment.43" Dual Screen LCD Ad Player Full HD Double Display All in One No Touch Android Advertise System, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Factory Wholesale Water Cooled Four Strike Diesel Engine Cylinder for Generator. Maximum MAER of 13.5% and minimum R2of 0.10 " Woofer Speaker-feasibility and even feasibility study level of projects.
References
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Wholesale 8inch 10inch 12 Inch 15inch DJ Speakers Professional Stage Audio, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Nitrogen Fertilizer N21% Min Ammonium Sulphate White Granular.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [20dB Gain DJ Mixing Console with MP3 Input ]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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