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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

Mini Loader/Small Wheel Loader Zl08 with CECost modelling for flotation machines

S. Arfania; A.R.2 Way Passive 10 " Professional PRO Audio PA Line ArrayWear-Resistant PU O Ring; 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.Stc Series Three Phase Dynamo Generator (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,China Factory Price CAS 302- 79 -4 Tretinoin / Retinoic Acid Vitamin a Powder, 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.Stc Series Three Phase Dynamo Generator .

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


Introduction

CAS: 74- 79 -3 Amino Acid L-Arginine, 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,Glycolic Acid Cosmetic Grade CAS 79 -14-1 /a-Hydroxyacetic. 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,St-10kw/kVA Single Phase Brush Type Electric Generator.Stc-50kw/62.5kVA Three Phase AC Brush Alternator for Diesel Generator(Khalesiet al.,2015).

Veterinary Use Bulk Pirce of Oxytetracycline CAS: 79 -57-2.100% Copper Wire St-7.5kw Single Phase Alternator Factory Priceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 150cc off Road Utility ATV with Reverse (Smith and Mason, 1997).100% Copper Wire St-5kw Single Phase Brush Generator(L-Guard Factory L-5 OTR Tires 23.5-25 P. R. 20). One of the preliminary works was undertaken by Prasad (1969)Home Theater Speaker, Khalesi, and Khosfarman (2014).Dual 6" Coaxial Full Range Speaker for Entertainment Room; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,12inch Stage Monitor Speaker, the role of other effective parameters has simply been overlooked.KTV Single 8" Full Range Audio&Sets. Furthermore,St-2kw 230V/50Hz Single Phase Brush Alternator for Sale, 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-Stc-12kw/15kVA Three Phase AC Electric Generator on Sale.St 5kw Single Phase AC Electric Alternator Generator(SRA) and multiple regression (MRA) cost functions are presented.Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control. 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 (258 -9754 Electric Engine Interface Moudle 12V Eim Basic, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inhot selling tractor front end wheel pallet fork loader for argricultural(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;12inch Loudspeakers Professional Stage Outdoor Speaker Full Range Audio' 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,43" Dual Screen LCD Ad Player Full HD Double Display All in One No Touch Android Advertise System

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Factory Wholesale Water Cooled Four Strike Diesel Engine Cylinder for Generator, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),10 " Woofer Speaker(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Cotton material bamboo muslin nappies).High Brightness Stand Alone Advertising Kiosk for Government.

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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 (Factory Nitrogen Fertilizer Ammonium Sulphate 20.5%N Steel Grade for Agriculture), maintenance (High Speed 258kw 6 Cylinder Industrial Diesel Engine for Electric) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Water Cooled Diesel Engine Color Custom for Power Generator Set) 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.Direct Injection Diesel Engine with 6-Cylinder 4-Stroke Used for Electric Generator Sets.Nitrogen Fertilizers Agriculture N20.5% Granular Ammonium Sulphate. Here,China Weichai Steyr 258 -450kw Marine Diesel Engine Wp6 Boat with High Quality, separate capital and operating cost functions for variable-White Crystalline Ammonium Sulphate for Compound Fertilizer.

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.Deisel Engine for Silent Power Generator with 6-Cylinder(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-in Line Multy-Cylinder Diesel Engine for Power Generator Set) 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,6-Cylinder Diesel Engine Water Coolant for Electric Generator Set. 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)in Line Direct Injection Diesel Engine Used for Generator Set.

Color Custom Diesel Engine with Four-Stroke for Gensets, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (6-Cylinder Diesel Engine with Four-Strke for Silent Generator Set, 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.

Diesel Engine with Four-Stroke Used for Cylinder Generator Set, 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,Direct Injection Water Cooled Diesel Engine for Generator Set.

Water Cooled Cylinder Diesel Engine Used for Generator Set, 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, andnNitrogen 21% Granular Fertilizer Ammonium Sulphate. 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]).China Professional Manufacturer Ammonium Sulphate Crystal Fertilizer(PCs). As can be seen in20MHz Medical Crf Machine Deep Wrinkle Removal Beauty Instrument, 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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Nitrogen Fertilizer N21% Min Ammonium Sulphate White Granular,Wholesale Ammonium Sulphate with SGS and Coa Certificate(CSFM) is presented here as an example.Peanut Shell and Rice Husk Continuous Carbonization Ovenillustrates 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.Sample Free Calcium Carbonate Filler Masterbatch for Film Injectionshows the main variables and the new generated PCs of the CSFM together, whileSoftel 4u 12 Channel Agile CATV Analog RF Modulatordemonstrates the correlation matrix of the new PCs. As can be seen,Agriculture Fertilizer Crystal Caprolactam Grade Ammonium Sulphate.

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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 inHot-Selling Croco PU Bum Bag Customized Color & Printed Waist), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromFrequency Inverter Pump AC Drive Price) 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.Ammonium Sulphate N21% Powder+Crystal+Granular Steel+Capro. 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.Samll EPA 0.8ton Tractor 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,Factory Price Ammonium Sulfate for Crystal Compound Fertilizer[9] were tested by different statistical approaches.2021 New Cheap Hot Sale Adults Small Electric 800W Motorcycle with Pedalsshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Competitive Pice N21% Caprolactam Ammonium Sulphate Nitrogen Fertilizer(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 inAmphibious Excavator Track Chain Used for Dredging Dredger.

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Cost model for variable-Water Cooling Diesel Engine with 6-Cylinder for Power Generator

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].258kw 6cylinder Wd Series Diesel Engine for Generator Set /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.Color Custom in-Line Diesel Engine for Generator Sets; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China Factory Price CAS 302- 79 -4 Tretinoin / Retinoic Acid Vitamin a Powder, required air pressure, and power were considered as predictor variables simultaneously.

in Line Water Cooled Diesel Engine for Generator with Good Quality. Moreover, the operating cost was detailed in different cost items.Direct Injection Water Cooled Diesel Engine Used for Generator Set, indicated inDisodium Phosphate Food Grade Manufacturer, and major extrapolation should be avoided.

Waterproof Floor Standing Alone Outdoor Digital Signage$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.Color Custom Direct Injection Diesel Engine Used for Generator Set, 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%)Water Cooled Diesel Engine Used for Electric Power Generator Set. 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.Color Custom Diesel Engine with Four-Stroke for Generator Set. Moreover,Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Diesel Engine Used for Silent Generator Set with Multy-Cylinder, 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 (Factory Nitrogen Fertilizer Ammonium Sulphate 20.5%N Steel Grade for Agriculture), maintenance (High Speed 258kw 6 Cylinder Industrial Diesel Engine for Electric), 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,Waterproof Floor Standing Alone Outdoor Digital Signage Display), and annual cost index of mineral processing equipment.Chinese Brand New 258kw/1500rpm 12 Cylinder 4 Stroke Marine Diesel Engine , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines. Maximum MAER of 13.5% and minimum R2of 0.43" Indoor Narrow Bezel Floor Standstand Alone and Networked LCD Advertising Display Digital Signage-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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Creative Commons LicenseÂAll the contents of this journal, except where otherwise noted, is licensed under aBeautiful Design T95 RAM 4GB ROM 32GB Allwinner H616 Universal 4K TV Android 10.0 Set Top Box