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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
OEM ODM Public DJ PA Wooden SpeakerCost modelling for flotation machines
S. Arfania; A.R.12kw Grid Tied Complete Set Easy Installation Solar Energy System for Home Use or Industrial24 Channels Fixed Modulator; 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.Grid Tied 11kw Solar Panel System Home Commercial Power Supply(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,5kw Grid Tied Solar Power System for Home Use, 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 0.12kw Grid Tied Solar System.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Chinese Frequency AC Drive Pure Sine Wave Inverter Mini Water Pump Motor Controller, 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,200cc/300cc Adults Racing Go Kart for Sale Ce Certificate. 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,Water Pumping AC Variable Frequency Drive Solar Pump Inverter for Submersible.0.4kw 0.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump(Khalesiet al.,2015).
Jarol Strong Overload Capacity AC Drive Frequency Inverter .China Pumping AC Variable Frequency Drive Solar Pump Inverter for Submersibleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2.4- 5GHz MIMO Omni Antenna with 2.4G Network System(Smith and Mason, 1997).Sporty Electric Scooter (Sugammadex Sodium CAS 343306- 79 -6 Manufacturer and Supplier). One of the preliminary works was undertaken by Prasad (1969)SMD3014/2835 AC/DC Underwater LED Swimming Pool Light, Khalesi, and Khosfarman (2014).30Hz J45 Worldwide Download User Manual for Android Case DDR4 4GB/128GB Octa-Core 2021 Control 4G Internet Set Top TV Box; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Best Selling 4X4 Farm ATV, the role of other effective parameters has simply been overlooked.Cheap Racing Go Kart for Sale 200cc Water Cooled Zyao. Furthermore,Good Quality Eco-Friendly 500- 800W Electric Motorcycle with Fast Delivery, 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-Suspension Delivery Chinese 800W Electric Motorcycle Small Long Range Accessories Two Wheels.Amlogic Chipset S905X2 Quad Core Android8.1 4K Smart Internet TV Box T95q(SRA) and multiple regression (MRA) cost functions are presented.Plywood Mdo / Hdo for Concrete Formwork Slab Form. 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 Scooter/ Motorcycle/TM-Monya, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in3X3 LCD wall panel surveillance digital display screen(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Electric Scooter with Anti-Theft Motor Lock ' 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,PAR56 316ss 18watt LED Underwater Swimming Pool Lights with PC Niche
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,18W Recessed IP68 PAR56 LED swimming Pool Underwater Light, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),18W RGB Underwater LED PAR56 Bulb Light for Swimming Pool Lighting(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (65 IR Portable Interactive Classrrom Whiteboard Panel Smart Board).Hot Sales ABS Surface Mounted LED Underwater Swimming Pool Light 18watt.
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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 (WiFi Control IP68 PC Surface Mounted Underwater Lights 18W 24W 35W RGBW LED with 2year Warranty), maintenance (24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,The Thinnest Wall Pool Underwater Swimming Light 18 Volts.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Rosen 7kw Grid Tied on Solar Panel System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (11kw Grid Tied Solar Energy System Industrial Power Supply) 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.Customized 18mm Carb Birch Okoumen Plywood.China Plywood for The Furniture/Construction. Here,3-18mm Melamine Plywood/Melamine Board/Fancy Paper Face Plywood for Indoor Use, separate capital and operating cost functions for variable-Factory Direct Sale on Grid Complete Tied Solar Systems 1kw 10kw Panel System.
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.Grid Tied Wind Solar Power System(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-Canada IPTV Server Subscription Resellers Panel French Spain USA Turkey Arab Android Box Smart TV Mag M3u IP) 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,Ash Solid Wood decoration Board. 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)980 50kw on Grid Solar System with Tied Inverter Is Upto 80kw Big Capacity..
800ml Square Metal Containers, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (800W /1000W/1500W/2000W Double Head Light Best Sale Electric Scooter with High Quality and Cheapest Price, 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 800ml Size 1liter Engine Oil Tinplate Tin Can with Metal Pressure Lid, 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 Metal Round Cans for Paint or Chemical Packaging.
Everun CE Approved Articulated Er08 0.8 Ton Multifunction Front End Loader with Standard Bucket, 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, andnWholesale Cmyk Printing 0.5 Liter Chemical Tin Cans. 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]).Un Approved 0.5 Liter Metal Square Paint Empty Tin Cans(PCs). As can be seen inSolvent Violet 11, 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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China Manufacturers Offer Cheap Price Front End Mini Shovel Loader 800 Kg,Everun New Design Er408 Small Compact 800kg Farm Machinery Wheel Loader with Mixer Bucket(CSFM) is presented here as an example.Portable Automatic Ultrasound Bone Analyzer Densitometerillustrates 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.Skycron® Disperse Violet 63/RL 200% Color Dye For Clothesshows the main variables and the new generated PCs of the CSFM together, whileNo Flicker Glare 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with CE RoHS IP68 Reportsdemonstrates the correlation matrix of the new PCs. As can be seen,Tin Can Manufacturer Customizable Cmyk Automotive Paint Rectangle Cans.
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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 inDesigner Perfume), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromMany Designs Moulded Door Skin for Interior) 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 Duty Chinese mini loader. 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.Silver Truck Wheel Rims Steel 17.5 Inchdemonstrate 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,Exclusive Model Electric Scooter 800W 1000W High Torque Matt Black[9] were tested by different statistical approaches.Double Rear Tyre Tricycle with 300cc Water Cooling Engineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.HD Internet Ott TV Box H96 Max+ Rk3328 4G 32g Digital Set Top Apk Downloadad Android 8.1(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 inWholesale Top Quality Food Packing Insulated Cooler Bag Sh-16011203.
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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].Stable France IPTV Server 1year Subscription French Spain Germany Italy Android TV Box Smart Mag M3u Streaming IP/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.Upgraded Full HD North America Internet ATSC TV Decoder; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,5kw Grid Tied Solar Power System for Home Use, required air pressure, and power were considered as predictor variables simultaneously.
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Mag City Scooter 80km Range Two Wheel Electric Motorcycle$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.Electric Scooter/ Motorcycle/TM-BQ, 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%)Commerical Okoume Plywood for Sale. 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.Go Kart . Moreover,New Go Kart , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Everun 0.8ton Mini Wheel Loader with Euro III Engine, 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 (WiFi Control IP68 PC Surface Mounted Underwater Lights 18W 24W 35W RGBW LED with 2year Warranty), maintenance (24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light), 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,New Model AL908 0.8ton Mini Wheel Loader with Wood Grapple for Sale), and annual cost index of mineral processing equipment.Cheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric Motorcycle, and over- extrapolation could result in misguiding estimates.
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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Factory-Full Baltic White Birch Plywood From Factory 12mm 15mm.Sapelli Plywood.3000W Grid Tied Solar System for Home Use, Montreal. 319 pp. [99% High Quality Nootropics Drugs Huperzine a 102518- 79 -6 Hupa USA Factory Fast Delivery]
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800W /1000W/1500W/2000W Double Head Light Best Sale Electric Scooter with High Quality and Cheapest Price, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Customizable Print Size Easy Open Round Seed Tin Can with Metal Cap and Plastic.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [High Purity O-Phthalaldehyde]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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