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Hongli Wood Workbench for Sale / Foldable Work Bench
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
Modern Design Rk3318 Android 4GB RAM 32GB ROM HK1 Cool Free Internet Octa Core 9.0 Set Top TV BoxCost modelling for flotation machines
S. Arfania; A.R.Portable Laptop Digital Automatic Ultrasound Bone Densitometer3HP 1 Phase Frequency Converter; 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.Haiqin Brand 0.8ton Mini Loader (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,Jarol Solar Inverter 5.5kw 3 Phase, 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.Hardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certification.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Textile Crane Centrifugal 380V Variable Frequency Drive VFD, 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,2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports. 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,AL908 Wood Gripper Wheel Loader with Euro III Engine for Sale.Inverter Cabinet VFD Frequency AC Drives 15kw Motor(Khalesiet al.,2015).
2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip.12V RGB Resin Filled Underwater Pool Lights with 2 Years Warrantyet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can(Smith and Mason, 1997).loader with excavator grapple wheel mini for sale good quality(Electric Portable DOT Peen Vin Number Marking Machine for Flange Numbering). One of the preliminary works was undertaken by Prasad (1969)24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah, Khalesi, and Khosfarman (2014).2ND Generation Ultrasound Bone Densitometer; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series, the role of other effective parameters has simply been overlooked.Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System. Furthermore,High Effective Automatic Ultrasound Bone Densitometer, 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-Low Price Ophthalmic a-Scan Ultrasound with Pachymeter Ho-100.MS-3100) Portable Full Digital Ophthalmic Ultrasound a/B Scan Pachymeter Biometer(SRA) and multiple regression (MRA) cost functions are presented.4.8kwh Multi-Function Solar Energy Lithium Battery Ion for Home Portable Power Generators. 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 (Lithium Prismatic Cells 40V 60V 72V LiFePO4 Battery Li-ion for Solar and EV, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPump Inverter Variable Frequency Drive Manufacturers AC Supplier(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Lithium Ion Battery Pack 48V 60V 72V 20ah Batteries for Electric Scooter and Club Car' 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,Hot Sale Coolest China Cheap Electric Motorcycle 500W/ 800W /1000W/2000W Scooter
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Wholesale Plastic Square 1 Liter Fertilizer Bottle, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithium(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Yzjinsd Quick Adjust System Thick Turret Punching Die).50cc Motorcycle.
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 (Vdf AC DC Drive Solar Power Inverter Converter Using for Tower Lift 250kw), maintenance (Zhenhua Classic Motorcycle Dax 125cc Euro4) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Super Cooling Smart Electric Scooter 500W 800W Motorcycle.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Wholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Caps) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Scooter / Motorcycle Electric Motor Power 800W 1kw 2kw 3kw) 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.5GHz Dual Pol Sector Antenna with Enclosure.5GHz 18dBi Dual Polarized Enclosure Antenna . Here,2.4/ 5GHz 10dBi Rubber WiFi Antenna, separate capital and operating cost functions for variable-Customized 36V 12ah 10 AMP Electric E Bike Li-ion Battery Pack 48volt Ebike Lithium Ion.
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.5GHz 18dBi Sector 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-125cc Retro Scooter Motorcycle) 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,Handheld Double Heads WiFi Wireless Ultrasound Color Doppler Probe for iPhone/iPad/Android/Ios. 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)Hot Selling 800W Brushless Motor Electric Scooter Motorcycle.
Lady's E-Scooter 800W Hot Sale Made in China, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Quality Electric Motorbike with 800W Motor, 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.
800W 72V China Electric Tricycle for Handicapped, 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,Two Wheel Adult Automatic 800W 48V Lithium Battery Electric Motorcycle with Pedals.
5GHz Antenna High Gain 16dBi Panel, 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, andn2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports. 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 29.5dBi Die Cast Grid Antenna(PCs). As can be seen in5kw Single Phase Home Grid Tied Solar Power System, 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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12volt Input 18watt IP68 Waterproof Underwater Application Swimming Pool LED Lights,5GHz 23dBi Dual Polarized Panel Antenna (CSFM) is presented here as an example.Chinese Heavy Truck Diesel Engine Pump Cylinder 161500137712illustrates 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.Manufacturer Supply Cosmetic Raw Material 98%-102% Tretinoin shows the main variables and the new generated PCs of the CSFM together, whileMule Deer Tranquilizer First Choice Tiletamine HCl Injection Free Sample 14176-50-2demonstrates the correlation matrix of the new PCs. As can be seen,5GHz 27dBi Enclosure WiFi Antenna.
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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 inArtificial Pepper Leaf Grass Hedge Panel 50X50cm Plastic Green Wall Outdoor Plants for Garden Decoration), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromZl08f Wheel Loaders with Ce Farm 0.8 Ton Tractor Mini/Small Compact) 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.High Quality 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with Edison Chip. 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.Zl08 0.8ton China Articulated Tractor Front End Wheel Loader Yarddemonstrate 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,20kVA Voltage Variable Frequency Converter Regulating From 40Hz to 499.9Hz 0-520V[9] were tested by different statistical approaches.Zl08 0.8ton Articulated Hydraulic Farm Wheel Loader Tractorshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.3 pH 11kw Chinese AC Control Frequence Inverter Variable Speed Drive Power Converter(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 inLovely Little Girl Children Shaped Jewelry Silver Necklace with Zircon.
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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].Three Phase Vector Frequence Converter with High Performance/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.Replica Aluminum Alloy Wheels for BMW 1/2/3/4/5/6/7 Series; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Jarol Solar Inverter 5.5kw 3 Phase, required air pressure, and power were considered as predictor variables simultaneously.
16"X6.0" 16'x7.0' 16X8.0 16X10 Trailer Steel Rim Wheel. Moreover, the operating cost was detailed in different cost items.AC Drive Frequnce Converter Frequence Inverter Manufacturer Supplier, indicated in20kVA St Series Single Phase Generator , and major extrapolation should be avoided.
14"X5.0"J 14'x5.5'j 14X6.0j 14X7.0j Inch Steel Wheel for Sport Trailer$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.Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service, 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%)Eougem Zl08 0.8 Ton Mini/Small Articulated Hydraulic Mini Front End Loader. 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.Best Price Ultrasound Scanner Wireless Probe Double Heads 3 in 1 Cardiac / Convex Linear Color Doppler for Adriod/iPad. Moreover,Ultrasonic a B Scan Ophthalmic Eye Ultrasound Scanner with Low Price, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Ce Approved Medical Portable Bone Densitometer Ultrasound Machine , 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 (Vdf AC DC Drive Solar Power Inverter Converter Using for Tower Lift 250kw), maintenance (Zhenhua Classic Motorcycle Dax 125cc Euro4), 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,Vitreous Hemorrhage ), and annual cost index of mineral processing equipment.500kw on Grid Tied Hybrid Solar Power Plant Station System, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,High Quality Classic China Motor Cargo Three Wheel Motorcycle . Maximum MAER of 13.5% and minimum R2of 0.Motorcycle with Dryweight 120-220kg-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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