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Cold Storage Room Walk in
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
Shower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Cabin AS-2800Cost modelling for flotation machines
S. Arfania; A.R.Custom Design Food Grade Heat Seal Refrigerate High Quality Plastic Aluminum Foil Pickles Kimchi Packaging Bag Zipper Window for Vegan Eco FriendlyMining Cement Stainless Steel 316L Protective Pressure Sensor; 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.Bloom Tech Chemical Reagent (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,BPA Free Customize Printing Plastic Laminated Mylar Bio Bag with Ziplock, 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.Active Pharmaceutical Ingredient CAS 15307- 79 -6 Diclofenac Sodium.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Hair and Eyelash Growth Acetyl Tetrapeptide-3/Capixyl CAS 155149- 79 -4, 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,High Quality Printed Food Packaging Doypack Aluminium Zipper Bags. 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,High Quality Argipressine CAS 113- 79 -1 with Best Price.1-Bromo-3(Khalesiet al.,2015).
Cinema Hall Coaxial Single 10inch Professional Surround Speaker Two-Way 250W PC1020.Sourcing O-Phthalaldehyde Opa CAS 643- 79 -8 in Stock Supplier From Chinaet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for IN-A7 handheld color doppler linear probe hip bone ultrasound scanner(Smith and Mason, 1997).55 Inch Stand Alone Digital Free Standing LCD Advertising Display(Plastic Customized Gift Zip Lock Garment Packaging Bag Composite Aluminum Foil Custom Food Packing Cookie). One of the preliminary works was undertaken by Prasad (1969)Top Selling 1, Khalesi, and Khosfarman (2014).Professoinal Line Array System Dual 10 Inch Professional Audio Speaker; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Dual 10 " Compact Speaker Line Array , the role of other effective parameters has simply been overlooked.Factory Supply High Quality N-Cbz-D-Leucine Powder CAS. 28862- 79 -5 99% Purity. Furthermore,Factory Supply Tretinoin / Retinoic Acid Vitamin a 302- 79 -4, 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-Economic Mulifunctional Line Array System Speaker Dual 10 Inch.Single 10inch Two Ways Professional Line Array Loudspeaker Bi AMP B&C Imported Driver with Vk10(SRA) and multiple regression (MRA) cost functions are presented.Professional Loudspeaker 10'' Neodymium Magnet. 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 (Kas PRO Top 10inch Line Array Audio Speaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inOrtho Phthalaldehyde CAS 643- 79 -8 O-Phthalaldehyde(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Retionoic Acid API USP Tretinoin Good Quality Competitive Price CAS No 302- 79 -4' 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,Customized Printed 3.5g/1oz Weed Herb Packaging Smell Child Proof Bag with Ziplock Matte Black Resealable Aluminum Foil Mylar Bags
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Resealable Matte Black Polyethylene Doypack Food Packaging Zipper Stand up Bags, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Doypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp Bag(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Surgical Anti-Pollution Non-Woven Fabric Safety Blue Green Black White Pink Earloop Pleated 3 Ply Disposable Face Mask for Doctors Ce Certified).2-Way Speaker PS10 for High Quality Stage Monitor.
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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 (Professional Line Array Speaker Single 10 Inch Full Range System), maintenance (Aluminium Foil Zip Lock Food Packaging Bag Manufacturer Plastic) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Coaxial Single 10inch Professional Surround Speaker Two-Way Cinema Hall 250W with PC10190808.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (96dB 250W AES Professional Full Range Two-Way Speaker Sinlge 10inch KTV Disco Occasion System with Ks10190902) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Professional Line Array System Single 10 Inch Neodymium Vr10) 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.Samsung LTI550HN16 1920X1080P monitor LCD video wall.Maunfacturing Price Sealed Food Packaging Vacuum Bag. Here,Custom Printed Heat Seal Aluminum Plastic Cat Food Packaging Bag Child Resistant Mylar, separate capital and operating cost functions for variable-Silver Zip Lock Aluminium Foil Bag for Gel/ Cosmetic / Three Side Seal Pouch Small Aluminum Bags Plastic Food Packaging Mylar Container Nut.
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.Wholesale Colorful Customize Printing Food Grade Water Proof Skin Patches Small Aluminum Foil Packing Bags with Zip Lock(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-10'' Ferrite Woofer Best Price Loudspeaker) 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,Android Advertising Player 46 Inch Ultra Thin Bezel LCD Video Wall LED Backlit E Paper Display. 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)Amazon Best Sell Custom Clears Silver Aluminum Foil Mylar Ziplock Stand up Pouch Bag.
Vr36 Dual 10 Inch 3 Way Passive Compact Line Array, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Factory Supply Chlorhexidine Acetate/ Mpb Diacetate /CAS 206986- 79 -0, 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.
Heat Sealing Embossed Plastic Vacuum Packaging Bag for Delicatessen, 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,Ceftriaxone Sodium 99% API CAS 104376- 79 -6 for Injection Grade.
Pharmaceutical Powder Vitamin a Acid /Retinoic Acid/ Tretinoin for Skin CAS 302- 79 -4, 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, andnCosmetic Raw Material Powder CAS 20449- 79 -0 Pure Bee Venom/Melittin/Melitten. 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]).Pharmaceutical Chemicals Cefodizime Sodium CAS 86329- 79 -5(PCs). As can be seen in4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio, 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]:
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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99% High Quality Nootropics Drugs Huperzine a 102518- 79 -6 Hupa USA Factory Fast Delivery,Manufacturer Supply Poly L-Lactic Acid with Lowest Price Raw Material Bulk 79 -33-4 for Food Additives(CSFM) is presented here as an example.30W CO2 Touch Screen Laser Marking Coding Engraving Machineillustrates 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.Globally Popular Glycolic Acid CAS Nmber 79 -14-1 with a High Exposure Rate and Favorable Priceshows the main variables and the new generated PCs of the CSFM together, whileMc4t-Branch Connector for Parallel Solar Panel Pair Male and Femaledemonstrates the correlation matrix of the new PCs. As can be seen,Crovell Factory Supply High Quality CAS 79 -57-2 Oxytetracycline.
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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 inFactory Price Sinotruk HOWO Truck Parts Cab), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Everun Er408t 800kg Earth-Moving Mini Front Wheel Loader for Sale) 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.Peptide Cosmetics CAS 155149- 79 -4 Capixyl. 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.L18 /8693 Falante Professional 18inch Subwoofer 1200W New Product China Supplierdemonstrate 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,China O-Phthalaldehyde Opa CAS 643- 79 -8 Raw Crystal 643798 Supplier[9] were tested by different statistical approaches.Professional Manufacturer Everun Er08 CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loadershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.100% Copper Wire St-1kw Single Phase Dynamo Factory Price(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 inCheap Air Freight to Mexico From China.
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Cost model for variable-China Supplier Antioxidants Powder of Propyl Gallate CAS: 121- 79 -9
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].37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Display/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.49" 450nits LG panel advertising LCD screen ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,BPA Free Customize Printing Plastic Laminated Mylar Bio Bag with Ziplock, required air pressure, and power were considered as predictor variables simultaneously.
aluminium LCD wall panel surveillance flat display. Moreover, the operating cost was detailed in different cost items.3X3 LCD wall panel surveillance digital display screen, indicated inHigh Quality CAS 16595-80-5 Levamisole Hydrochloride/ HCl, and major extrapolation should be avoided.
AV input LCD wall panel 49inch surveillance monitors$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.LG panel 49" advertising rack , 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%)55inch wall mount LCD panel surveillance LED video. 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.Two-Way 10inch Karaoke Full Range Speaker F10+ PA Horn. Moreover,55 Inch LCD Video Wall Display with Controller, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (10inch Speaker for Music Bar PRO Audio Sound System, 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 (Professional Line Array Speaker Single 10 Inch Full Range System), maintenance (Aluminium Foil Zip Lock Food Packaging Bag Manufacturer Plastic), 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,10inch Professional Karaoke Speaker for Luxury Room), and annual cost index of mineral processing equipment.Samsung 55inch 3X3 Digital Signage Display Screen 3.5mm Narrow Bezel, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,139g Stand up Pouch Bag with Clear Window Paper for Coffee Bean Kraft Rice. Maximum MAER of 13.5% and minimum R2of 0.Local Anesthetic Cinchocaine CAS85- 79 -0 for Pain Killer-feasibility and even feasibility study level of projects.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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