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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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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

Cyclopropyl Acetylene/ Lide Pharma- Factory Supply / Best Price CAS 6746-94-7Cost modelling for flotation machines

S. Arfania; A.R.High-Performance Frequency Converter/AC Drive 380V 50/60HzProfessional Speaker Box F12+; 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.Three Phase 380V Small Frequency Converter(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,Hot Sale High Performance Vector Frequency Converter 380V 45/55kw, 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.Single/Three Phase 220V 380V Vector Control Frequency Converter.

Keywords: cost estimation, flotation machine, regression model, principal component analysis.


Introduction

Factory-Enginneered Veneer Ash in 0.30mm, 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,Small Frequency Inverter 380V 50/60Hz. 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 Single Phase Variable Frequency Inverter 1.5kw.1.2mm White Poplar Veneer From Factory for Exporting(Khalesiet al.,2015).

Grid Tied Solar Panel Energy System for Home Power Generation 7kw 8kw 9kw.Eucalyptus Core or Birch for Veneer with Grade AAet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Gt1544V 740611-5002s 28201-2A400 Turbo for Hyundai Verna(Smith and Mason, 1997).Wholesale 1.5 mm Natural Bamboo Skateboard Veneer with Best Price(Bintangor Okoume Pencil Ceder Commercial Plywood for Furniture and Decoration). One of the preliminary works was undertaken by Prasad (1969)Popular 800W Power Electric Scooter, Khalesi, and Khosfarman (2014).1250X2500mm Rotary Cut Okoume Veneer Cheap Prices; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Factory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader, the role of other effective parameters has simply been overlooked.2862 Easy Installation 5kw 6kw 8kw 10kw 12kw on Grid Solar System. Furthermore,Eougem CE 1.0 Ton Hydraulic Mini Radlader Zl08, 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-Wolf 0.8t 800kg Mini Loader with Euro 3 Engine.500- 800W 48V 20ah OEM manufacturers Electric Scooter(SRA) and multiple regression (MRA) cost functions are presented.800W Brushless Adult Electric Scooter. 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 (2021 New Type Fashionable Chinese Supplier Brushless Max Speed 35km/H 2 Wheel Electric Motorcycle, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in17 Inch 18 Aftermarket New Design Aluminum Car Alloy Rim(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Best Chinese Big Wheel Electric Motorcycle Racing Bike Adult Bicycle' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),2021 Fashionable High Quality with Lithium Battery Electric Scooters EEC Vespa Citycoco Newest Model Motorcycle(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wedding Dress).Pump Inverter Variable Frequency Drive Manufacturers AC Supplier.

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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 (Cheap Smart Electric Scooter for Lady 60V800W20ah with Customer Foot Pedal), maintenance (Wenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,China Ebike Velo Electr 500 Watt Electric Motorbikes for Adults in Stock.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Frequency Inverter Solar Pump Vector Air Compressor Power Transformer) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Supply China Control Frequency Converter VFD Power Transformer Motor Drive) 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.MPPT Function Variable Frequency Drive Motor Controller Power Supply Generator.0.75kw-11kw Three Phase 380V Frequency Inverter VFD. Here,2885 Factory 25 Years Warranty Solar Power Kits 5kw 8kw 10kw 12kw Grid Energy System, separate capital and operating cost functions for variable-2876 10kw Home Used Solar Power System on Grid Roof.

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.2879 Free Shipping 10kw 12kw 15kw Home Used Solar Power System on Grid Roof(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-AAA Grade 0.9mm Poplar Core/Veneer for Plywood/Furniture) 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,Radiate Pine Face Veneer. 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)Grade AA Veneer Furniture Building Material Plywood to Dubai.

1L Wholesale Round Tin Can for Paint/Engine Oil with Tight Lid, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Manufacturer of Enigine Oil Can, 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.

Small Wheel Loader Wl80 800kg Loaders for Farm Work, 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,1L Tin Can for Camellia Oil .

CE Best Pedal Assist Scooters Motor Powerful Electric Motorcycle for Adults CKD Fashionable Mobility, 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, andnMxq 4K PRO Allwinner H3 Quad 7.1 1GB RAM 8GB ROM H. 265 3D Android Media TV Box. 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]).2021 Best Sale Fashionable Cheaper High Quality 1000W Adults 2 Wheel Electric Motorcycle(PCs). As can be seen inHigh Quality Hot Sale PC Epoxy Resin Filled 12V AC 18W RGB Wall Mounted LED Swimming Pool Light with Edison Chips, 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.Mobile Digital High Frequency Mini Induction Brazing Welding Equipment for Saleshows the main variables and the new generated PCs of the CSFM together, whilePE Geomembrane/Waterproof Sheet Extrusion Linedemonstrates the correlation matrix of the new PCs. As can be seen,5 Litre Extra Olive Oil Tin Can .

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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 inCustomized 7PCS White Luxury Diamond Make up Brushes Set), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromYn725g Yineng Mini Wheel Loader) 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.Frequency Converterlow Industrial Power Inverter. 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.Diesel Central Drive Three Wheel Dumper for Saledemonstrate results for the machines modelled in this research.

Multiple regression results

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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].DC/AC Frequency Inverter Solar Pump Power 400-600V Input 4kw/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

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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.Titan Chargeuses Cheap Small Log China Mini Digger Loader with European Quick Hitch. Moreover,Chinese Factory Direct Supply Lithium Battery Electric Scooter LCD Display Motorcycle E-Scooter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Cheap Chinese Moped Scooter with Lithium Battery Rechargeable Electric Motos Motorcycle, 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 (Cheap Smart Electric Scooter for Lady 60V800W20ah with Customer Foot Pedal), maintenance (Wenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados), 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 Wuxi Best Selling New Type Racing Mobility Adults 2 Wheels Electric Motorcycles E Motos CKD Scooters), and annual cost index of mineral processing equipment.Grid Tied Solar Energy System 5kw 10kw 20kw 50kw 100kw 200kw 300kw 500kw, and over- extrapolation could result in misguiding estimates.

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Manufacturer of Enigine Oil Can, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-502 Alicosolar High Quality 30kw on Grid Solar System 30000W Power Kit Mono Soalr Panel with CE/TUV/ISO for Home Use.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Innopack 5L Paint Engine Oil Tin Can with Plastic Handle]

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USBM. 1987.2382 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use,HK1 Smart TV Box Amlogic S905W Android 7.1 Quad Core 2GB 16GB-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Custom Logo PVC Bag Aluminium Foil Thermal Insulation Cooler]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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