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Stainless Steel
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
1liter Empty Paint Tin Can with Lids FactoryCost modelling for flotation machines
S. Arfania; A.R.Yn725 Yineng Mini Wheel Loader 18.5kw CabinAl-Gw6 China Best Adult Electric Motorcycle Scooter for Sale; 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.Natural Wood Veneer Oak /Cherry/Walnut MDF Board(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,Zl08 0.8ton Mini Tractor Backhoe Front End Farm Wheel Loader Price List, 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.Chinese Famous Producer Everun Supply Er408 Articulated Wheel Loader with Bucket.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
0.3mm Rotary Cut Red Wood Veneer, 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,Factory-Quater Cut Okoume Veneer /Mahogany in 0.50mm. 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,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin.Gurjan Veneer Keruing(Khalesiet al.,2015).
Everun CE Approved 0.8 Ton Front End Loader.Empty Lubricant Oil Tin Can Packaging for Motoret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Linear Type Fully Automatic Paper Box Pack Flavor Milk PE Film Heat Shrink Packaging Machine(Smith and Mason, 1997).974 Solar 30kw 40kw 50kw on Grid Tie Power System for House/Factory Roof(5L Engine Motor Oil Can Screw Top Rectangular Metal Tin). One of the preliminary works was undertaken by Prasad (1969)2-30mm Hot Sale Double Sided E0/E1 Glue Melamine/Fancy Plywood for Furniture, Khalesi, and Khosfarman (2014).New Products Customized Support 1080P Decoder Box H. 265 TV with Internet Port; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,2393 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use, the role of other effective parameters has simply been overlooked.Factory Product 4K Android TV Box Mxq PRO Rk3229 7.1 1GB 8GB. Furthermore,970 Solar 30kw 40kw on Grid Tie Power System for Factory Roof, 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-Best Price Food Tin Metal Box Clip Lid Candy Can.3L/5 Liter Metal Can Packing Empty Cans for Ink and Coating From China Manufacturer(SRA) and multiple regression (MRA) cost functions are presented.High Quality Mxq PRO 4K Rk3229 1GB 8GB Android7.1 Quad Core Android TV Box. 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 (High Efficicency Roof Mounting Grid Tied Home Solar Energy System, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inElectric Three Wheel Motorcycle Transaxle Cargo Tricycle Rear Axle 800W 1500W 1800W 2000W Full Floating 0.5ton~1.2ton Accessories(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;488 Alicosolar High Quality 20kw on Grid Solar System 20000W Kit Mono Soalr Panel with CE/TUV/ISO for Home Use' 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 Factory Direct Cheap New Model Electric Bicycle Convenient Motorcycle Best Price in CKD for
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,OEM 6kw Home Grid Tied Solar Power System Without Battery, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Al-Gw6 China Best Adult Electric Motorcycle Scooter for Sale(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (China High Performance Veking Chromium Blow Bar Casting).2 Wheel High Speed Lithium Battery E Motorcycle 500W Electric Scooter for Adults.
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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 (800kg Wolf Zl08 Wheel Hoflader Loader Mini Bagger with Attachments), maintenance (High Quality Cheap Custom Logo Printing Round Metal Cans with Lids) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Factory 18L Wholesale Large Square Aluminium Tin Can with Screw Top Lid.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Hot Sale Factory Direct Colorful Electric Motorcycle for Passenger Made in China) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Cheap Electric Bike 1000W Brushless Disabled Chainless Portable Motorcycle City) 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.Square Engine Oil Tin Can with Screw Cap Manufacturer Lid.Frequency Converter 60Hz 50Hz 150HP. Here,Frequency Converter 60Hz 50Hz 125HP, separate capital and operating cost functions for variable-Frequency Converter 60Hz 50Hz 160HP.
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.Frequency Converter 60Hz 50Hz 60HP(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-Frequency Converter 60Hz 50Hz 75HP) 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,Frequency Converter 75HP Three Phases. 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 Sell for European Countries 48V 20ah Lithium Battery Fast Food Delivery Electric Motorcycle.
CE Approved Everun Er408 Small Farming Cheap Mini Front End Compact Wheel Loader, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, 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.
Frequency Converter 50HP Three Phases, 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,Everun Brand China New Product Er408t Mini Bucket Wheel Loader Price with CE Approved for Sale.
3HP Three Phase Frequency Converter, 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, andnYn725 Yineng Mini Wheel Loader 18.5kw Cabin. 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]).10HP Three Phase Frequency Converter(PCs). As can be seen inGood Price CE 500W Bicicletas Electricas 48V Electric Motorcycle 800W for Adult, 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]:
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 E-Bike Manufacturer Dropship Electro Motorcycle Electric Beach Cruiser Bicycle Chopper for Girls,Zl08 0.8t Hot Sale Small Yard Loader Mini Tractor Front End(CSFM) is presented here as an example.Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouseillustrates 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.Seal Kits Komatsu PC200-5/6 Boom Cyl Kitshows the main variables and the new generated PCs of the CSFM together, whileLf Driver 10 Inches 63.5mm Kapton Coil Professional Speaker demonstrates the correlation matrix of the new PCs. As can be seen,Wl80 Mini Loader with Yanmar Engine.
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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 inPillow Block Ball Bearing with / Without Housing), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from12inch Stage Monitor Speaker) 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.Solar Energy System 10kw 15kw Grid Tied Hybrid PV. 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.200cc Reverse Wholesale Motor Light Three Wheel Motorcycle demonstrate 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,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin[9] were tested by different statistical approaches.Mini Variable-Frequency Drive/ VFD /Adjustable-Frequency Drive /Afd/ Variable-Voltage/Variable-Frequency /Vvvf/Drive/ Variable Speed /VSD/ACshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.2385 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use(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 in800kVA/640kw Power Generator Set Yuchai Diesel Engine Genset.
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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].Zl08 0.8ton China Articulated Tractor Front End Wheel Loader Yard/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.Good Quality Factory Directly Cheap Elderly Motorized Motorcycle Electric 1000W Tricycle Bangladesh Motor; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Zl08 0.8ton Mini Tractor Backhoe Front End Farm Wheel Loader Price List, required air pressure, and power were considered as predictor variables simultaneously.
Everun Brand Mini Front End Loader 0.8 Ton Wheel. Moreover, the operating cost was detailed in different cost items.Zl08 800kg China Small Garden Tractor with Front Loader Yard, indicated inHot Selling to Nigeria Market Manufacture Motorbike Tyre 3.50-18, and major extrapolation should be avoided.
Hot Sale 48V 20ah Powerful Chinese Chopper Electric Motorcycle 350W for Adults$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.Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, 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%)Bulk Fashion Smart Electric Scooter 60V800W20ah. 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.962 Complete Solar System 40kw on Grid Home with High Quality. Moreover,off Grid 20kw Solar System 20 Kw Panel Kit, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Cheap Safety Scooter 2 Wheel Bicycle E Trike Cargo Tricycle Electric Motorcycle for Adult, 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 (800kg Wolf Zl08 Wheel Hoflader Loader Mini Bagger with Attachments), maintenance (High Quality Cheap Custom Logo Printing Round Metal Cans with Lids), 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,Rosen 1kw Grid Tied on Solar System to Global Market), and annual cost index of mineral processing equipment.475 Alicosolar Good Quality 15kw on Grid Solar System 15000W Kit Mono Soalr Panel with CE/TUV/ISO for House Use, and over- extrapolation could result in misguiding estimates.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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