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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
3 Phase AC Drive for Water Pump and FanCost modelling for flotation machines
S. Arfania; A.R.China Factory Pricing Empty Round Food Grade Nut Tin Cans20MHz RF Wrinkle Removal; 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.High Performance 6kw Grid Tied Home Solar Energy System(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,Oil Treatment Packaging Tin Container Can, 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.Rosen 8kw Grid Tied on Solar System to Global Market.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Factory-Slicer Natural American Red Oak Veneer in 0.50mm, 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,Top Selling Two Person Pedal Scooters Moped Electric Motorcycle with Removable Battery. 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,Custom Waterproof and Oil Sealing Round Metal Tin Can.CE Er08 Mini Wheel Loader with One-Year Warranty for Sale(Khalesiet al.,2015).
Innopack Tin Can with Brush Round Oil Cans.Alcohol/ Refrigerating Fulid Screw Top Can with Brush Wholesaleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2 X HDMI(Smith and Mason, 1997).2021 New Removable Battery 350W Motor Scooter Electric Motorcycle for Adult(Tycorun Solar DC to AC Inverter 3kw/4kw/5kw/6kw on Grid Tied Single Phase for Home). One of the preliminary works was undertaken by Prasad (1969)3 Liter Tin Packing Chemical Can with Spout, Khalesi, and Khosfarman (2014).Food Grade Round Tin Can for Welded Milk Powder Packaging; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,1gallon Round Metallic Tin Can with Metal Handle for Paint, the role of other effective parameters has simply been overlooked.Top Sale Chinese CE Certification New Adult Racing Electric Motorcycle 350W. Furthermore,Custom Resealable Round Metal Tin Can with Lid Packing Manufacturer for Oil Paint Industrial Use, 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-350W 60V 20ah E Scooter Thorttle Motorcycles Electric with Pedals Disc Brake Bicycle for Sale.Fluid Storage Containers Lubricants for Use(SRA) and multiple regression (MRA) cost functions are presented.0.8t 800kg Small Loader. 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 (Factory Direct High Quality Glue Round Tin Cans with Brush, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWolf Mini Loader Wl80 with Grass Cutter(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;350-1500W 48-72V Smart Cheap Motorcycle for Adults Heavy Duty Electric' 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,Roof Mounting 20kw Grid Tied Solar Power System Home
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Wolf 0.8t Mini Loader with Grass Fork(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wholesale Factory OEM ODM Nail Gel Polish Private Label Available UV LED Soak off).Everun Brand 0.8ton Compact Wheel Loader with 4in1 Bucket.
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 (Zl08f Wheel Loader with Rops Cab), maintenance (2HP 1 Phase Frequency Converter) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,7.5HP Three Phase Frequency Converter.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (3HP 1 Phase Frequency Converter) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (3HP 1 Phase Frequency Converter) 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.10HP Three Phase Frequency Converter.3HP Frequency Converter Vector Three Phase. Here,15HP Three Phase Frequency Converter, separate capital and operating cost functions for variable-Power Smart Electric Scooter with LED Light 60V800W20ah.
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.3HP Three Phase Frequency Converter(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-1HP Frequency Converter Vector Three Phase) 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,15HP Frequency Converter Vector Three Phase. 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)2HP Frequency Converter Vector Single Phase.
Solar Energy System 5kw Panel Home Grid Tied Power 6kw 8kw 10kw, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Home Use 6kw Grid Tied Solar Power System with High Performance, 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.
Hot Sale 10kw 10000W off Grid Solar Power System Home Use, 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,4kw 3phase Frequency Converter 50Hz to 60Hz.
1.5kw 3phase Frequency Converter 50Hz to 60Hz, 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, andnAutomaticall Switch 5kw 6kw Hybrid Solar System with Lithium Battery Backup and Tier 1 Panels. 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]).Round Tin Can for Food Packaging Empty Tinplate(PCs). As can be seen inAuto Feeding Inner Mounted Pipe Tube Beveling Engine, 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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Pencil Cedar Veneer Medium Denstiy Fiberboards for Stairs,Technical Wood Veneer MDF Boards for Cupboard(CSFM) is presented here as an example.Electric Motorcycle illustrates 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.High Quality Underwater Swimming Pool Light Decoration LED Lampshows the main variables and the new generated PCs of the CSFM together, whileCheap Price Electric Four Wheels Environment Protection Car for Adultsdemonstrates the correlation matrix of the new PCs. As can be seen,High Quality Small Metal Tin Can with Open Top Lid for Lubricant.
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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 inStamping Die Standard Mold with Longer Life), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromGMP Standard Pharmaceutical Intermediates Raw Powder CAS 102518- 79 -6 Huperzine a with Best Price) 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.Huihuang Bamboo Fence Timbers. 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.Single 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5cdemonstrate 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,Solar Power System Home 5kw off Grid Tied Solution[9] were tested by different statistical approaches.High Power Speaker Dual 10 " PRO/Professional Audio Line Array shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.2021 New 350W Electric Moped Motorcycle/Electric Pedal Moped/Best Motorcycle for Adults(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 inHigh Resolution P3 LED Video Wall Indoor Display Advertising Screen.
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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].Dah Complete on Grid Solar System Easy Install 30kw 50kw Tied Power/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.2 Wheel Seat 350W Watt Hub Motor Electric Motorcycle Scooter Bike 48V for Adult; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Oil Treatment Packaging Tin Container Can, required air pressure, and power were considered as predictor variables simultaneously.
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0.75kw Power Frequency Converter 60Hz 50Hz$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.Variable Frequency Inverter Solar Pump DC/AC, 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%)Tx6s H616 Allwinner 4K Smart Aluminum Ott IPTV 10.0 Android TV Box. 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.2.5L-25L Square Metal Tin Can with Lid for Paint Glue Adhesives Packing. Moreover,1 Liter Metal Square Tin Can with Screw Lid for Oil Paint Chemical, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Wholesale 947 Ml/32oz Metal Round Glue Can Tin with Brush Cap, 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 (Zl08f Wheel Loader with Rops Cab), maintenance (2HP 1 Phase Frequency Converter), 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,500ml 16oz Round Metal Glue Tin Can with Screw Top Brush for Chemical), and annual cost index of mineral processing equipment.Alcohol/ Refrigerating Fulid Screw Top Can with Brush Wholesale, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Customized B/C/D/E Grade Wood/Natural Birch Veneer. Maximum MAER of 13.5% and minimum R2of 0.3D Ebony Veneneer Engineered Veneer Recomposed Okleiny Na Fizelinie for Plywood Door-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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