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Manual Chain Block with Hook Hoist
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
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S. Arfania; A.R.Hot Sale 800ml Size 1liter Engine Oil Tinplate Tin Can with Metal Pressure LidPadlock; 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.Hot Sale Metal Round Cans for Paint or Chemical Packaging(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,Everun CE Approved Articulated Er08 0.8 Ton Multifunction Front End Loader with Standard Bucket, 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.Wholesale Cmyk Printing 0.5 Liter Chemical Tin Cans.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Un Approved 0.5 Liter Metal Square Paint Empty Tin Cans, 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,5 Liter Tinplate Metal Packing Car Paint Container Engine Oil Tin Can. 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,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(Khalesiet al.,2015).
Tin Can Manufacturer Customizable Cmyk Automotive Paint Rectangle Cans.Titan Brand 0.8 Ton High Quality Mini Wheel Loader with and Performance.et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for New Model High Technology Efi CBS LED 250cc 4 Valves Oil Cooled Retro Gasoline Motorcycles Race Motorcycle(Smith and Mason, 1997).High Duty Chinese mini loader(Frequency Converter 50Hz to 60Hz Fan Speed Controller Solar Power Inverter China). One of the preliminary works was undertaken by Prasad (1969)Exclusive Model Electric Scooter 800W 1000W High Torque Matt Black, Khalesi, and Khosfarman (2014).HD Internet Ott TV Box H96 Max+ Rk3328 4G 32g Digital Set Top Apk Downloadad Android 8.1; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, the role of other effective parameters has simply been overlooked.Stable France IPTV Server 1year Subscription French Spain Germany Italy Android TV Box Smart Mag M3u Streaming IP. Furthermore,Upgraded Full HD North America Internet ATSC TV Decoder, 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 Quality Cost-Effective Products12V 18W LED Swimming Pool Light with Edison Chip.High Quality Switch Control Multi Color Big Commercial Project Concrete LED Swimming Pool Light with Two Years Warranty(SRA) and multiple regression (MRA) cost functions are presented.Mag City Scooter 80km Range Two Wheel 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 Scooter/ Motorcycle/TM-BQ, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAll Sizes Good White Recon Veneer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Commerical Okoume Plywood for Sale' 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,Cheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric 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,5HP 50Hz 60Hz 3.7kw 3 Phase VFD Variable Frequency Drive for Motor, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Quality 18W 12V IP68 Waterproof LED Swimming Pool Lamps with Edison Chip(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Commercial H-beam multi-storey prefabricated steel structure for warehouse buildings).50Hz 60Hz 220V/380V Vector Control AC Variable Frequency Drive.
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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 (3 Phase 11kw Speed Low Cost AC Variable Frequency Drive Inverter VFD Manufacturers for Electric Motor), maintenance (Triple Phase 380V 50Hz 60Hz 7kw AC Variable Frequency Converter) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Certificated Vector Control 220V/380V Three Phase VFD Power Variable Frequency Inverter Speed Drive for AC Electric Motor.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Growatt Solar Inverter 17kw 20kw 25kw Grid Tied Three Phase on Power System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (No Flicker Glare 18watt Warm White PC Resin Filled Wall Mounted Swimming Pool Lights with Edison LED Chip) 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.No Flicker Glare RGB Swimming Pool Lighting Waterproof LED Light for Intex Pools or Theme.TUV Certificate Gried Tied on Grid 30kw Solar Power System. Here,2021 New Design RGB Swimming Pool Lighting Waterproof LED Light for Intex Pools or Theme, separate capital and operating cost functions for variable-China Frequency Inverter Drive AC Motor Speed Controller with Great Price.
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.China Heavy Load Inverter 220V 380V Three Phase Converter DC to AC(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-3000W Grid Tied Solar System for Home Use) 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,Factory-Full Baltic White Birch Plywood From Factory 12mm 15mm. 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)Sapelli Plywood.
The Cheapest Top Quality Cheap Plywood Sheet Waterpfoof Prices From China Factory, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Pour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouth, 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.
Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kart, 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 Scooter 800W 60V20ah Lead Acid.
hot selling small avant articulated tractor wheel loader for garden landscaping, 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, andnUV White Birch Plywood 18mm Carb E0 Cabinet. 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]).18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood(PCs). As can be seen inPedal E-Bike / Scooter Electric Bicycle 500W/ 800W, 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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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.Ophthalmic Ultrasonic Pachymeter and Biometershows the main variables and the new generated PCs of the CSFM together, whileHigh Quality Chloramphenicol CAS 56-75-7 China Factory Supplierdemonstrates the correlation matrix of the new PCs. As can be seen,French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can.
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 inStrapless Wedding Gown Backless Beach Bridal Dresses), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromIsopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0) 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.
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.SGS Food Grade Certification 500ml Tin Containers Olive Oil Can. 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.Wholesale 8inch 10inch 12 Inch 15inch DJ Speakers Professional Stage Audiodemonstrate 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,Wholesale Round Food Packaging Empty Tin Metal Cooking Oil Cans[9] were tested by different statistical approaches.24W Bluetooth Soundbox & WiFi Mobile APP Voice Control Customized Smart RGB Tunable Children Room Kids LED Ceiling Lampshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.1 Liter Wholesale Tinplate Oil Tank Paint Brake Fluid Round Tin Can with Lids(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 inBlack Changing Color Heat Reveal Travel Magic Cup.
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Cost model for variable-2021 Everun New Design Er408 Small Front End Loader 0.8ton Mini Wheel
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].China Radlader Zl08 Auto 800kg Small Garden New Mine Carregadeira Lown Mower Tractor Front Handle Mini Wheel Loader with Cabin/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.Chinese Eougem Zl08 Wheel Loader with Torque Converter; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Everun CE Approved Articulated Er08 0.8 Ton Multifunction Front End Loader with Standard Bucket, required air pressure, and power were considered as predictor variables simultaneously.
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Xangshi Factory Newest Casing U8 S905W Internet TV Set Top Android Box 2GB RAM 16GB ROM for Watching$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.New Design Go Kart 150cc , 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%)External Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router. 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.48V/60V 800W Electric Scooter with Lead-Acid Battery. Moreover,800W 60V Lead-Acid Battery Electric Bicycle with Back Rest, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Electric Motorcycle 800W for Adult Motor, 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 (3 Phase 11kw Speed Low Cost AC Variable Frequency Drive Inverter VFD Manufacturers for Electric Motor), maintenance (Triple Phase 380V 50Hz 60Hz 7kw AC Variable Frequency Converter), 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,Hot Sale Lady Style 60V 800W 20ah Electric Scooter with USB), and annual cost index of mineral processing equipment.800W -1000W 60V/72V Electric Scooter with Lead-Acid Battery, and over- extrapolation could result in misguiding estimates.
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USBM. 1987.Emtpy 250L Round Clutch Brake Fluid Small Can with Plastic Lid,Wolf Wl80 Mini Dumper Euro 5 Loader for Sale-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp. [Motorcycle Carburetor Intake Manifold Pipe Joint for Honda Cg125]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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