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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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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

Crystal Caprolactam Grade Ammonium Sulphate Vegetables and Fruits FertilizerCost modelling for flotation machines

S. Arfania; A.R.Erbium-Doped Fiber Amplifier Optical Power Adjustable Good Quality Empty 1 Litre Metal Tin Paint Cans with Handle 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.Dirt Bike for 199 Cc Displacement(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,Sab-500 Ophthalmic a/B Scanner, 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.[Softel]Agile Modulator Full Range CATV Agile Tunable Ah-802h.

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


Introduction

200cc Reverse Wholesale Motor Light Three Wheel Motorcycle , 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,Industrial Energy Saving Device Made in China. 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,150cc Enclosed Gasoline Motorized Cargo Trike with Box .Xprobe Series Built-in Screen Wireless Probe Type Ultrasound Scanner(Khalesiet al.,2015).

Power Saver Box Energy.Power Saver Energy Saving Deviceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Professional Audio Signal 8" Two-Way Full-Range Speakers PA System with Tq8(Smith and Mason, 1997).Power Saver for Industrial (Karaoke Voice Reduction Professional Audio Converter Proaudio ). One of the preliminary works was undertaken by Prasad (1969)Industry Saveing Box , Khalesi, and Khosfarman (2014).Industry Saveing Box ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Motorcyle with Bore * Stroke 66*58.2 mm, the role of other effective parameters has simply been overlooked.Electricity Saving Device 600amp . Furthermore,250cc Motor Cabin Tricycle Cargo with Canopy, 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-Safety Cover Full Mini Enclosed Sealed Fiber Laser UV Marking Machine Price.Flexible Label Laser Marking Machine(SRA) and multiple regression (MRA) cost functions are presented.Flying Laser Marking System Marker. 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 (800W Color Fashion Electric Motorcycle, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHot Melt Adhesive Film & TPU Making Machine(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;20W 30W 50W 150X150mm 200X200mm Lens Metal Steel Fiber Laser Machine' 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,150cc Cheap Open Gas Reverse Trike

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Sport Using Motor Vehicle with Sealed Chain Final Drive, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),GS-a 12mm CATV Fixed RF Attenuator(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High Quality Manual Handle Tirfor Winch).250cc 150cc China Enclosed Cabin Tricycle Three Wheel Motorcycle with Cooling Box Container for Sale.

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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 (Automatic High Effective Medical Ultrasound Bone Densitometer ), maintenance (New 50cc Monkey Bike Gasoline Motorcycle Euro 4) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,China 250cc New 3 Wheel Motorcycle Motor Tricycle.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (3ru 24 in 1 CATV Fixed Channel Modulator ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (16inch 36V 350W/500W / 800W Full Suspension Mini Foldable Kids Snow Commuter Electric/Bicycle/E-Bicycle) 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.Satellite Ts Encryption HD Receiver with Multiplexing Function.Motor Tricycle Three Wheel Cargo Trike for Sale. Here,Motorbicycle for Well Done Accessories, separate capital and operating cost functions for variable-16 in 1 CATV Modulator Fixed Frequency.

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.8 Channels HDMI to DVB-T Modulator(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-Medical Equipment Ho-200 Ophthalmic a/B Ultrasound Scanner) 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,Motor Vehicle for High Speed and Stable Function. 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)Outdoor 750MHz One Way CATV Trunk Amplifier .

China Enclosed Ice Cream Tricycle Three Wheel Cargo with Cooling Box, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (New Racing Motorcycle, 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.

Cheap 3 Wheel Cargo Tricycle with Box , 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,Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital.

Motorcycle for 1405mm of Wheel Base, 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, andnIN-BA1 Excellent Ultrasound Bone Densitometer for Adults and Children from China. 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]).5150-5850MHz Sector Panel Antenna with 2*16dBi Gain for Best Design(PCs). As can be seen inCarb E0 Cabinet Grade 18mm Plywood in High Quality, 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.Laminated for Coffee Cookie Food Packaging Bag Aluminum Medical Stand up Pouch Manufacturer Custom Self-Sealing Plastic Mylar Ziplock Barrier Exit Containershows the main variables and the new generated PCs of the CSFM together, whileHot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Enginesdemonstrates the correlation matrix of the new PCs. As can be seen,Best Selling Ophthalmic Ultrasound a/B Scanner Full Digital Touch Screen.

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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 inPampering disposable diapers baby wholesale for single use), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromMars Solar 30kw Power System on Grid Tied Micro Sine Wave Inverter) 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.Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler. 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.Yn725g Yineng Mini Wheel Loaderdemonstrate 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,Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer[9] were tested by different statistical approaches.20 mm 20mm PVC Pipe Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint 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 inAdorable Mini Kangaroo Embroidery Big Eyes Plush Animal Toy.

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Cost model for variable-5GHz Antenna High Gain 29dBi

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].2.4- 5GHz MIMO Omni Antenna with 2.4G Network System/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.Sector Antenna 5GHz; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Sab-500 Ophthalmic a/B Scanner, required air pressure, and power were considered as predictor variables simultaneously.

Mini Wheel Loader Small Dumper Hoflader Wolf Zl08. Moreover, the operating cost was detailed in different cost items.2.4G- 5GHz Fiberglass Omni Antenna with 8dBi Gain WLAN/WiFi, indicated inHF-LPD100 2.4/5G Dual Band SMT Package IOT Module WiFi, and major extrapolation should be avoided.

2.4- 5GHz MIMO Omni Antenna with 11dBi$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 0.2.4- 5GHz Omni Antenna , 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%)E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25. 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.1L Tin Can for Oil. Moreover,Trade Peak Lowest Price for 150cc ATV, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (L-Guard Factory L-5 OTR Tires 23.5-25 P. R. 20, 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 (Automatic High Effective Medical Ultrasound Bone Densitometer ), maintenance (New 50cc Monkey Bike Gasoline Motorcycle Euro 4), 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 New China Adult Tricycle Motor Cargo for Sale), and annual cost index of mineral processing equipment.Wholesale China High Quality OTR Tyre 17.5-25 G2 Pattern., and over- extrapolation could result in misguiding estimates.

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Mular, A.L. 1982.Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood.Lithium Polymer Battery Mica 3.7V Mc602540 550mAh Li Pack for Electronic Device.New Model High Quality 4 Stroke LED Efi 50cc 100cc 110cc Gasoline Scooter Gas Moped Super Soco Bike Mini, Montreal. 265 pp.         [Yn725 Yineng Mini Wheel Loader 18.5kw Cabin]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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