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10oz Glossy Black Sublimation Mugs with Bottom
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 Liter Tin Packing Chemical Can with SpoutCost modelling for flotation machines
S. Arfania; A.R.Frequency Converter for Small Power Motors 3pH 380V 50/60Hz4 Liter Metal Tin Can F-Style with Lid and Plastic Handle for Oil; 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.Manufacturer of Rectangular Brake Oil Motor Engine Tin Can(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,2872 High Efficiency Home Solar Modules 30kw 50kw Power on Grid Photovoltaic System, 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.Automobile Paint Can 5L Square Tin with Metal Cap for Ink Oil.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
866 5kw on Grid Solar System with Power Inverter for Home, 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,Food Grade Metal Tin Can with Printing Logo for Cooking Oil. 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,Good-Tightness Square Tin Can Metal Engine Oil with Sscrew Lid.800W Electric Scooter (Khalesiet al.,2015).
Good-Sealing Square Tin Can Engine Oil with Metal Lid.0.15mm-1.0mm Okume/ Bintangor/ Sapelli Natural Veneer From Linyi Orikey Woodet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2021 Best Selling 500W Electric Moped E Bike Bicycle with Pedals(Smith and Mason, 1997).Special Design Braided Veneer with Red Walnut(2021 Wuxi Best Selling New Type Racing Mobility Adults 2 Wheels Electric Motorcycles E Motos CKD Scooters). One of the preliminary works was undertaken by Prasad (1969)Natural Wood Bintangor Face Veneer for Door and Furniture, Khalesi, and Khosfarman (2014).Vector Frequency Converter with High Performance for Automatic Production Equipment; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Natural Horizontal Bamboo Veneer for Panel Board, the role of other effective parameters has simply been overlooked.Frequency Converter with SVC and Vf Control 380V 50/60Hz. Furthermore,Electric Motorcycle , 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-High-Performance Frequency Converter Three Phase 380V 50/60Hz.China Hot Selling 2021 Mini Electric Scooter Mobility Motorbike Wholesale(SRA) and multiple regression (MRA) cost functions are presented.Electric Motorcycle . 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 (Electric Motorcycle , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAdult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel Scooter(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Electric Motorcycle' 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,2L Galvanized Tin Cans for Cooking Oil with Plastic Lids
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Electric Motorcycles , blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Made in China Solar System 10kw 20kw 30kw 40kw 50kw Energy for Industry(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Anti-Theft Travel Backpack Promotional Men Business Laptop Bag for Outdoor).Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader.
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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 (800W Aluminium Alloy Wheel Hubs Sport Electric Motorcycle), maintenance (Zl08 Chargeuse Wheel Loader) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Professional Manufacturer Everun Er08 CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (500W EEC Electric scooter) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Electric 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.Solar Electric Motorcycle.Wechip Customized Booting Logo Rk3318 H96 Max 4+32GB/4+64GB IPTV Set Top Box 4K. Here,OEM 1500W EEC Electric Scooter , separate capital and operating cost functions for variable-New Arrival 4K Smart S905X2 TV Box 4+64GB X96 Mini.
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.0.25mm Natural Wood Face Veneer(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-2L Empty Tin Container for Engine Oil Lubricant) 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,High-Performance Three Phase Frequency Converter 380V 50/60Hz. 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)Electric Motorcycle .
EEC Electric Scooter , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (800w /1100w EEC Electric Scooter , 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.
Factory Produce Natural Face Veneer Size 1220X1830X0.25mm, 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,Electric Motorcycle/Scooter/Bike .
800W EEC Electric Motorcycle, 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, andnNo Foldable 40-60km Range Per Charge EEC Electric Scooter. 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]).1 Wheel Electric Motorcycle/One Scooter(PCs). As can be seen inWholesale 947 Ml/32oz Metal Round Glue Can Tin with Brush Cap, 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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Three Phase 380V Small Frequency Converter,Hot Sale High Performance Vector Frequency Converter 380V 45/55kw(CSFM) is presented here as an example.Chlorhexidine Diacetate CAS No 206986- 79 -0illustrates the high correlation between predictor variables for the CSFM.
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.2.4- 5GHz Omni Antenna shows the main variables and the new generated PCs of the CSFM together, whileLAN/Wan LED Wsb419 Qualcomm Atheros Ipq4019 Dual Band 802.11AC Mu-MIMO AMD Embedded Motherboard Onboard WiFi System on Moduledemonstrates the correlation matrix of the new PCs. As can be seen,Single/Three Phase 220V 380V Vector Control Frequency Converter.
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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 Selling High Quality Fashion Nail Polish), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromGlycine Methyl Ester Hydrochloride ) 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.Small Frequency Inverter 380V 50/60Hz. 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.White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmkdemonstrate 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 Single Phase Variable Frequency Inverter 1.5kw[9] were tested by different statistical approaches.Nitrogen Fertilizer Caprolactam Grade Ammonium Sulphateshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.1.2mm White Poplar Veneer From Factory for Exporting(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 inHexagonal Aluminum Pop up Folding Tent for Car Trade Show.
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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].Eucalyptus Core or Birch for Veneer with Grade AA/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.Wholesale 1.5 mm Natural Bamboo Skateboard Veneer with Best Price; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,2872 High Efficiency Home Solar Modules 30kw 50kw Power on Grid Photovoltaic System, required air pressure, and power were considered as predictor variables simultaneously.
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Factory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader$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 0.2862 Easy Installation 5kw 6kw 8kw 10kw 12kw on Grid Solar System, 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 CE 1.0 Ton Hydraulic Mini Radlader Zl08. 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.Wolf 0.8t 800kg Mini Loader with Euro 3 Engine. Moreover,500- 800W 48V 20ah OEM manufacturers Electric Scooter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (800W Brushless Adult Electric Scooter, 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 (800W Aluminium Alloy Wheel Hubs Sport Electric Motorcycle), maintenance (Zl08 Chargeuse Wheel Loader), 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,2021 New Type Fashionable Chinese Supplier Brushless Max Speed 35km/H 2 Wheel Electric Motorcycle), and annual cost index of mineral processing equipment.Best Chinese Big Wheel Electric Motorcycle Racing Bike Adult Bicycle, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Bd600 AC Frequency Inverter/Converter/220 V to 380 Inverter. Maximum MAER of 13.5% and minimum R2of 0.1L Beer Can-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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