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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
Buy Real Pharmaceutical Intermediates Pmk Glycidate Powder 13605-48-6Cost modelling for flotation machines
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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.China Jiaxing Jarol Frequency Inverter 0.75kw/220V New(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,Portable Laptop Digital Automatic Ultrasound Bone Densitometer, 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.Haiqin Brand 0.8ton Mini Loader .
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Jarol Solar Inverter 5.5kw 3 Phase, 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,Hardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certification. 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,Textile Crane Centrifugal 380V Variable Frequency Drive VFD.2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports(Khalesiet al.,2015).
AL908 Wood Gripper Wheel Loader with Euro III Engine for Sale.Inverter Cabinet VFD Frequency AC Drives 15kw Motoret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker(Smith and Mason, 1997).2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip(3HP 1 Phase Frequency Converter). One of the preliminary works was undertaken by Prasad (1969)12V RGB Resin Filled Underwater Pool Lights with 2 Years Warranty, Khalesi, and Khosfarman (2014).loader with excavator grapple wheel mini for sale good quality; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah, the role of other effective parameters has simply been overlooked.2ND Generation Ultrasound Bone Densitometer. Furthermore,Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series, 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-Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System.High Effective Automatic Ultrasound Bone Densitometer(SRA) and multiple regression (MRA) cost functions are presented.Low Price Ophthalmic a-Scan Ultrasound with Pachymeter Ho-100. 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 (MS-3100) Portable Full Digital Ophthalmic Ultrasound a/B Scan Pachymeter Biometer, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inElectric Portable DOT Peen Vin Number Marking Machine for Flange Numbering(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;4.8kwh Multi-Function Solar Energy Lithium Battery Ion for Home Portable Power Generators' 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,150cc Motorcycle
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,5L Vegetable Cooking Oil Custom Tinplate Square Can, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Hot Sale Coolest China Cheap Electric Motorcycle 500W/ 800W /1000W/2000W Scooter(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Italian Venata Carrara White Marble Slab for Kitchen Countertop/Table Top/Bathroom Floor/Wall).Wholesale Plastic Square 1 Liter Fertilizer Bottle.
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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 (Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithium), maintenance (50cc Motorcycle) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Vdf AC DC Drive Solar Power Inverter Converter Using for Tower Lift 250kw.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Zhenhua Classic Motorcycle Dax 125cc Euro4) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Super Cooling Smart Electric Scooter 500W 800W Motorcycle) 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.Wholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Caps.Scooter / Motorcycle Electric Motor Power 800W 1kw 2kw 3kw. Here,5GHz Dual Pol Sector Antenna with Enclosure, separate capital and operating cost functions for variable-5GHz 18dBi Dual Polarized Enclosure Antenna .
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.2.4/ 5GHz 10dBi Rubber WiFi Antenna(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-Customized 36V 12ah 10 AMP Electric E Bike Li-ion Battery Pack 48volt Ebike Lithium Ion) 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,5GHz 18dBi Sector WiFi Antenna. 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)125cc Retro Scooter Motorcycle.
Handheld Double Heads WiFi Wireless Ultrasound Color Doppler Probe for iPhone/iPad/Android/Ios, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Hot Selling 800W Brushless Motor Electric Scooter Motorcycle, 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.
Lady's E-Scooter 800W Hot Sale Made in China, 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,High Quality Electric Motorbike with 800W Motor.
800W 72V China Electric Tricycle for Handicapped, 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, andnTwo Wheel Adult Automatic 800W 48V Lithium Battery Electric Motorcycle with Pedals. 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]).5GHz Antenna High Gain 16dBi Panel(PCs). As can be seen inElectric Motorcycle, 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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5GHz 29.5dBi Die Cast Grid Antenna,No Flicker Glare 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with CE RoHS IP68 Reports(CSFM) is presented here as an example.1L Custom Metal Round Tin Cans Box Packaging for Glue Coating Sloventillustrates 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.Chinese Heavy Truck Diesel Engine Pump Cylinder 161500137712shows the main variables and the new generated PCs of the CSFM together, whileManufacturer Supply Cosmetic Raw Material 98%-102% Tretinoin demonstrates the correlation matrix of the new PCs. As can be seen,12volt Input 18watt IP68 Waterproof Underwater Application Swimming Pool LED Lights.
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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 in16%-17% Iron Free Non-Ferric Aluminium Sulphate Price), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromDecorative Pine Groove Plywood Veneer Fancy) 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 0.5GHz 27dBi Enclosure WiFi Antenna. 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.High Efficiency 6kw Grid Tied Solar Power System for Homedemonstrate 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,TUV Certificate Gried Tied on Grid 20kw Solar PV System[9] were tested by different statistical approaches.Zl08 0.8ton China Articulated Tractor Front End Wheel Loader Yardshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Quality 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with Edison Chip(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 inFashion Leaf Design Brooch.
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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].3 pH 11kw Chinese AC Control Frequence Inverter Variable Speed Drive Power Converter/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.Water Proof Vet Ultrasound Scanner; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Portable Laptop Digital Automatic Ultrasound Bone Densitometer, required air pressure, and power were considered as predictor variables simultaneously.
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16"X6.0" 16'x7.0' 16X8.0 16X10 Trailer Steel Rim Wheel$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.AC Drive Frequnce Converter Frequence Inverter Manufacturer Supplier, 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%)14"X5.0"J 14'x5.5'j 14X6.0j 14X7.0j Inch Steel Wheel for Sport Trailer. 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.Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service. Moreover,Eougem Zl08 0.8 Ton Mini/Small Articulated Hydraulic Mini Front End Loader, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Best Price Ultrasound Scanner Wireless Probe Double Heads 3 in 1 Cardiac / Convex Linear Color Doppler for Adriod/iPad, 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 (Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithium), maintenance (50cc Motorcycle), 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,Ultrasonic a B Scan Ophthalmic Eye Ultrasound Scanner with Low Price), and annual cost index of mineral processing equipment.Ce Approved Medical Portable Bone Densitometer Ultrasound Machine , and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Vitreous Hemorrhage . Maximum MAER of 13.5% and minimum R2of 0.500kw on Grid Tied Hybrid Solar Power Plant Station System-feasibility and even feasibility study level of projects.
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Hot Selling 800W Brushless Motor Electric Scooter Motorcycle, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Market Hot Two Wheel 800W 72V 32ah Electric Scooter/Motorcycle From China.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [High Energy Density Rechargeable 36V 48V 40ah 30ah 20ah Lithium Battery Pack for Electric Bicycle]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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