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Lapel Pin Badge Manufacturer Metal Shiny Gold Plated Hard Enamel Pins
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
Overseas Warehouse Fast Delivery Organic Chemicals Cost modelling for flotation machines
S. Arfania; A.R.Waterproof Childproof Ziplock Valve BagDisperse Violet 26 Dyes; 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.Professional Sound Speaker Single 8 Inch Portable Stage Monitor PS8r2(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,Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate, 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.Factory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Price.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
L-Arginine Powder Amino Acid Pure Manufacturer, 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,White Powder Vitamin a for Food and Feed Grade. 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,Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol.Professional Line Array Speaker Neodymium Af15(Khalesiet al.,2015).
Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic Grade.Q210 Passive PA Speaker Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Jarol Solar Inverter 5.5kw 3 Phase(Smith and Mason, 1997).Retinol Palmitate/Vitamin a Palmitate Oil as Food Ingredient(750ml Metal Tin Can Container for Chili Oil Canning). One of the preliminary works was undertaken by Prasad (1969)Professional 24 Channels Digital Audio Mixer Console, Khalesi, and Khosfarman (2014).100% Natural Huperzia Serrata Extract 1% 5% 99% Huperzine a Brown Powder Supplements; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Skin Care Raw Material Vitamin a Palmitate Powder, the role of other effective parameters has simply been overlooked.Lf Drivers 10 Inches Professional Speaker Pw1032-64. Furthermore,12" Loudspeaker as Monitor Speaker System 12 Inch Powerful Coaxial, 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-Made in China PA Speaker System Three Way Loudspeakers.Line Array Speaker Professional PA System Two Way Full Rang Passive (SRA) and multiple regression (MRA) cost functions are presented.Pyridinecas Number 110//86//1 Used as Chemical Reagent. 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 (Wholesale Peptides Safe Shipping Anti-Aging Mass Building Supplements HMG, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMini Small Hot Sale in Europe Wheel Loader for(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;P-Toluenesulfinic Acid Sodium Salt Hydrate ' 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,Factory Supply 99% Dexketoprofen Trometamol Powder
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,10W Wall Mount Speaker with Transformer 8 Ohm 100V Bluetooth , blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Karaoke Wireless Portable Bluetooth PA Trolley Speaker Box(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Germany PC Dyed Abstract Fabric for Curtains Can Be Customized).Feiyang New Hot Selling Trolley Speaker Fg210-06.
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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 (V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater), maintenance (PRO Audio PA System Digital Mixer) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Food Grade L-Arginine with Best Price.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (J8 Dual 12'' Line Array PA Speaker Professional Stage Audio System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (10 " 12"15"18" PA Speakers Loudspeaker Cabinet/Enclosure) 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.Wild Bee Venom Extract Melittin 99% Powder for Skin Care.Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1. Here,Retinoic Acid CAS 302- 79 -4 in Stock, separate capital and operating cost functions for variable-Plastic Clear White Stand-up Drinking Liquid Spout Food Packaging Bag.
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.ISO Certified 100% Natural L-Arginine Powder(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-High Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1) 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,Chemical Reagent Bloom Tech 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)High Quality Opa O-Phthalaldehyde with Best Price.
Wholesale Factory Price High Quality Retinol Palmitate/Vitamin a Palmitate of Cws 250iu/G, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (KTV 10 Inch Speaker Box with Good Sound, 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.
10 Inch Powered Line Array Speaker Active, 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,Hot Sale Model V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker.
Dual 10 Inch Line Aray Powered Active Sound System, 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, andn60W 10 " Portable HP5 Series Trolley Speaker with 2 UHF Mics. 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]).Manufacturer Supply 1(PCs). As can be seen inOLED Intermediates 2-, 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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Dual 10 " 600W Line Array PA Professional Speaker ,10 " Dia Cast Aluminum Professional Subwoofer Basket(CSFM) is presented here as an example.Manufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Mylar Recyclable Heat Sealed Coffee Bean Rice Dough Powderillustrates 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.Wireless Earbuds Headphones with Bluetooth 5.0 Earphones True Stereo Tws Charging Case for Sports Drive or Workshows the main variables and the new generated PCs of the CSFM together, whileWolf Agricultural Machinery Construction Small Front End Wheel Loader with Euro5 and Tier4 Enginedemonstrates the correlation matrix of the new PCs. As can be seen,Food Packaging Vacuum Pouch.
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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 inHot sale china baby diaper maker), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from300cc Triciclo Con Cabina) 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.L-Arginine 99%. 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.Yn725g Yineng Mini Front End Loaderdemonstrate 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 Factory Price CAS 702- 79 -4 1[9] were tested by different statistical approaches.China Manufacturer Latest European Modern Furniture Genuine Leather Sofashows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.CPP High Temperature Vacuum Retort Pouch(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 inFedEx From China to Monaco and Othereuropean Countries.
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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].High Temperature 3 Side Seal Retort Pouch for Corn/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.R-3-Amino-1-N-Boc-Piperidine; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate, required air pressure, and power were considered as predictor variables simultaneously.
ISO Certified 100% Natural L-Arginine Powder. Moreover, the operating cost was detailed in different cost items.Mylar Barrier Exit Waterproof Cr Bag, indicated inDehydrating Agent / CAS No.: 67-63-0 Isopropyl Alcohol Ipa, and major extrapolation should be avoided.
Stand-up Ziplock Dried Food Packaging Vacuum Plastic Container$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.High Quality Laminated Food Grade Roll Film, 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%)D&B Style Dual 10 Inch Compact Line Array . 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.Safety Shape Bag /Food Packaging Contact Plastic Container for Resealable. Moreover,Custom Plastic Coffee Flat Bottom Food Packaging with Ziplock Container, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Family Usage Embossed Vacuum Bags for Food, 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 (V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater), maintenance (PRO Audio PA System Digital Mixer), 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,Matte Black Food Packaging Stand-up Pouch Aluminum Foil Bag), and annual cost index of mineral processing equipment.Snsck Food Bag Fried Flat Bottom Box Pouch with Zipper, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Dual 10 " Compact Speaker Line Array . Maximum MAER of 13.5% and minimum R2of 0.10 " Woofer with 3" Voice Coil-feasibility and even feasibility study level of projects.
References
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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Custom Kraft Paper Flexible Food Packaging Flat Bottom Bag-100gr.Custom Water Proof Child Resistant Food Grade Plastic Aluminum Laminated Stand up Container Bag.Dual 10 " Compact Professional Line Array , Montreal. 319 pp. [Kas PRO Top 10inch Line Array Audio Speaker]
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KTV 10 Inch Speaker Box with Good Sound, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-New Model V8 D&Bstyle Dual 10 Inch Three Way Line Array Speaker.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [Ho-500 Ce Approved High Quality Eye Diagnosis System Ophthalmic Ultrasound Scanner]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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