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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

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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.New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power(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,5GHz 30dBi Grid Parabolic Antenna , 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 0.5GHz Dish Parabolic Antenna 29dBi.

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


Introduction

2.4/ 5GHz Dual Band H-Pol Sector Antenna, 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,Electric Dirt Bike Zm-Es18 with 500W- 800W Motor. 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,5GHz 20dBi Enclosure WLAN Antenna.5GHz 45deg Dual Pol Sector Antenna(Khalesiet al.,2015).

5GHz 23dBi Enclosure WiFi Antenna.5GHz Dual Pol Sector Antenna with Enclosure et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Doypack Standing Washing Powder Packaging Bag/Liquid Laundry Detergent Spout Pouch(Smith and Mason, 1997).5GHz 34dBi Dish WLAN Antenna(N21% Nitrogen Fertilizer Ammonium Sulphate Factory Price). One of the preliminary works was undertaken by Prasad (1969)5GHz 18dBi Dual Polarization Sector WiFi Antenna, Khalesi, and Khosfarman (2014).18W RGB Resin Filled LED Surface Mounted Underwater Pool Light; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Poplar Film Faced Plywood Board with Carb Certificate, the role of other effective parameters has simply been overlooked.18W 12V IP68 Waterproof LED Swimming Pool Lamps. Furthermore,Hot Sale on-Grid 20kw Grid Tied Solar Power Home System, 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-E1 Glue Malamine Mositure-Proof MDF with Carb Certification.High Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports(SRA) and multiple regression (MRA) cost functions are presented.Quality 18mm Carb Birch Okoumen Plywood. 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 (Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inJwell- PP PS Plastic Environmental Protection Sheet Recycling Making Extrusion Cup Machine Production for Green Food Container and Packaging Good Price(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;30kw Grid Tied Solar Power System Home Popular in Philippines' 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,150ml Plastic Clear White Bullet Liquid Bottle for Cosmetic Industry

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,14" to 22' Inch Replica Aluminum Alloy Wheel for KIA Rims, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Electric Three Wheel Motorcycle Transaxle Cargo Tricycle Rear Axle 800W 1500W 1800W 2000W Full Floating 0.5ton~1.2ton Accessories(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (4K Analysis Starlight IP PTZ Face Detection CCTV Camera).300cc Cargo Tricycle of Asia Market.

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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 (Building Material Commercial Plywood with Carb to Europe), maintenance (AL908 800kg Rated Load Wheel Loader with CE Approved for Sale) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,China Jiaxing Jarol Frequency Inverter 0.75kw/220V New.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Portable Laptop Digital Automatic Ultrasound Bone Densitometer) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Haiqin Brand 0.8ton Mini Loader ) 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.Jarol Solar Inverter 5.5kw 3 Phase.Hardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certification. Here,Textile Crane Centrifugal 380V Variable Frequency Drive VFD, separate capital and operating cost functions for variable-2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports.

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.AL908 Wood Gripper Wheel Loader with Euro III Engine for Sale(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-Inverter Cabinet VFD Frequency AC Drives 15kw Motor) 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,2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip. 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)12V RGB Resin Filled Underwater Pool Lights with 2 Years Warranty.

loader with excavator grapple wheel mini for sale good quality, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah, 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.

2ND Generation Ultrasound Bone Densitometer, 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,Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series.

Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System, 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, andnHigh Effective Automatic Ultrasound Bone Densitometer. 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]).Low Price Ophthalmic a-Scan Ultrasound with Pachymeter Ho-100(PCs). As can be seen inFrequency Drive Converter Solar Pump Inverter, 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.Rimonabant Powder Weight Loss Factory Direct Supplyshows the main variables and the new generated PCs of the CSFM together, while1051 China Manufacturer Big on Grid Solar System Government Projects 1 MW 5wm 10demonstrates the correlation matrix of the new PCs. As can be seen,Lithium Ion Battery Pack 48V 60V 72V 20ah Batteries for Electric Scooter and Club Car.

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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 inMetallic Foil Mailer Poly Bubble Bags Colorful Air Padded Envelopes Shipping Express for E-Commerce Products), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Suppllier Ammonium Sulphate 21% Nitrogen Fertilizer) 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 0.5L Metal Round Cans for Paint or Chemical Packaging. 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.Chinese Cheap 1000W 2 Wheel Mobility Scooter Electrical Moped Motorcycle for Adultdemonstrate 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,150cc Motorcycle[9] were tested by different statistical approaches.Buy Real Pharmaceutical Intermediates Pmk Glycidate Powder 13605-48-6shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.5L Vegetable Cooking Oil Custom Tinplate Square Can(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 inAbnormity Glazed Porcelain Mug of Syb031.

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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].Wholesale Plastic Square 1 Liter Fertilizer Bottle/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.Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithium; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,5GHz 30dBi Grid Parabolic Antenna , required air pressure, and power were considered as predictor variables simultaneously.

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Zhenhua Classic Motorcycle Dax 125cc Euro4$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.Super Cooling Smart Electric Scooter 500W 800W Motorcycle, 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%)Wholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Caps. 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.Scooter / Motorcycle Electric Motor Power 800W 1kw 2kw 3kw. Moreover,5GHz Dual Pol Sector Antenna with Enclosure, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (5GHz 18dBi Dual Polarized Enclosure Antenna , 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 (Building Material Commercial Plywood with Carb to Europe), maintenance (AL908 800kg Rated Load Wheel Loader with CE Approved for Sale), 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,2.4/ 5GHz 10dBi Rubber WiFi Antenna), and annual cost index of mineral processing equipment.Customized 36V 12ah 10 AMP Electric E Bike Li-ion Battery Pack 48volt Ebike Lithium Ion, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,5GHz 18dBi Sector WiFi Antenna. Maximum MAER of 13.5% and minimum R2of 0.125cc Retro Scooter Motorcycle-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.No Flicker Glare 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with CE RoHS IP68 Reports.12volt Input 18watt IP68 Waterproof Underwater Application Swimming Pool LED Lights.5GHz 23dBi Dual Polarized Panel Antenna , Montreal. 265 pp.         [Zl08f Wheel Loaders with Ce Farm 0.8 Ton Tractor Mini/Small Compact]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.5GHz 27dBi Enclosure WiFi Antenna.TUV Certificate Gried Tied on Grid 20kw Solar PV System.5GHz 23dBi Dual Polarized Panel Antenna , Montreal. 319 pp.         [High Efficiency 6kw Grid Tied Solar Power System for Home]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.High Quality 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with Edison Chip.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Zl08 0.8ton China Articulated Tractor Front End Wheel Loader Yard]

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24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [Custom Printed Cooler Bag]

24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah, A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.Minerals Engineering,vol. 55. pp. 96-102.         [Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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