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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.Electric Pipe End Bevelling Machine(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,T-Electric Pipe Bevelling Machine , 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.Pneumatic Pipe Beveling Machine High Performence.

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


Introduction

Act CNG LPG Fuel System 2568cyl ECU Kits, 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,Factory Directly Sell Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Oil Cup. 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,Plastic Green Color Masterbatch.4 Cyl CNG Auto Gas LPG Conversion Kit / Sequential Injection System(Khalesiet al.,2015).

3cyl 4 Cyl 6cyl 8cyl LPG/CNG Injector Rail.L Auto Gas LPG Conversion Kit / Car 4 Cyl Sequential Injection Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 150cc 200cc Gy6 4 Wheel Chain/Shaft Drive Gas Powered Sport Quad Bike ATV(Smith and Mason, 1997).High Quality Diesel Engine Parts 4 Cyl Pump Rotor Head 096400-0371(Supprot OEM Software Android 9.1 Rk3228 2GB and 16GB Wholesale TV Boxes). One of the preliminary works was undertaken by Prasad (1969)Diesel Engine Parts Injection System Nozzle Dnopd619, Khalesi, and Khosfarman (2014).Supply API 99%Min Dalbavancin CAS 171500- 79 -1 Raw Material Powder; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Diesel Engine Parts Fuel System Nozzle Dlla145pn574, the role of other effective parameters has simply been overlooked.Master Batch Organic Colors. Furthermore,Orange Color Masterbatch, 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-Plastic Purple Color Masterbatch.Plastic Grey Color Masterbatch(SRA) and multiple regression (MRA) cost functions are presented.Free Sample Color Masterbatch ABS PE Non Toxic for Injection Molding. 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 (Cosmetic Grade Liquid Form 70% CAS 79 -14-1 Glycolic Acid, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inProfessional Line Array PA System S1210 Sound(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Health Raw Material Dibasic Sodium Phosphate CAS No.: 7558- 79 -4 with High Quality' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Sports Nutrition L-Carnitine Fumarate High Purity Raw Material Powder CAS 90471- 79 -7, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Best Price Bulk Powder Retinyl Palmitate 79 -81-2(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Private Label Gel Jelly Polish Bulk Long Lasting Top Coat Foundation Base).Nutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Delivery.

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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 (Health Raw Material L-Carnitine Fumarate CAS.: 90471- 79 -7), maintenance (Diesel Engine Parts Fuel Injection Nozzle Dlla152sm043) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Diesel Engine Parts Fuel Injection Nozzle Dlla156sm139.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Diesel Engine Parts Fuel Injection Nozzle 152sn924) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Auto Engine Diesel Parts Fuel Injector Common Rail Nozzle Dlla162p2266) 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.Diesel Engine Parts Fuel Injection Nozzle Dlla156s820.Tws Bluetooth Earphones with Charging Cases Wireless 5.0 Earbuds Headphones for iPhone. Here,Diesel Engine Parts Fuel Injection Nozzle 150sn902, separate capital and operating cost functions for variable-Tws Sport Headset Stereo Headphone Earphone with Charging Box Black.

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.3D Stereo Sound Mini Headphone Built in Microphone & Dual Speakers for Phone Calls(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-New Products Charging Case Mini Small Headphones Tws Earbuds Wireless 2021) 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,Transparent Nylon 12 Resin Raw Material Polyamide Granules. 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)PA12 Natural Resin Transparent Granules Pellets Polyamide Price.

PA12 Plastic Granule for Injection Molding Polyamide 12 Resin Nylon, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PA12 Injection / Extrusion Molding Polyamide 12 Nylon Granules, 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.

Nylon 12/Nylon Granules/Polyamid 12/Transparent Glasses Frame, 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,Good Performance Virgin Transparent PA12 Granules/Pellets/Resin Equivalent with Tr90 for Glasses Frame.

Raw Material Plastic Resin Pellets Polyamide PA12 Medical Grade Transparent Nylon Granules, 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, andnHot Sales! ! Polyamide Nylon PA12 PA Plastic Granules for Injection Grade. 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 Hot Selling Good Performance Transparent PA12 Granules / Ployamide 12 for Commercial Installation(PCs). As can be seen inThree-Way Large Touring Performance Line Array System PA Speaker, 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.Apr125-2 White Motorcycleshows the main variables and the new generated PCs of the CSFM together, whileFactory-Full Baltic White Birch Plywood From Factory 12mm 15mmdemonstrates the correlation matrix of the new PCs. As can be seen,Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Sliding Mechanism.

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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 inMulti Plug Extension USB Socket Power Outlet 10A 260W), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHigh Adhesion Polyurethane PU Resin for Printing Ink) 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.Professional Carbon Black Masterbatch Factory for Rubbish Bag. 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.Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Pricedemonstrate 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,PE Green Color Masterbatches Supplier in China[9] were tested by different statistical approaches.Variable Frequency Drive Inverter Manufacturer 3 pH Power Saver AC Synchronous Motorshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Sample Free Calcium Carbonate Filler Masterbatch for Film Injection(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 inAgricultural LED Work Lamps for Farm Machinery.

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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].Pharmaceutical High Purity Peptides Powder CAS No. 113- 79 -1 Argipressin Acetate/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.Good Taste Maltose Sugar Hot Selling Price 69- 79 -4; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,T-Electric Pipe Bevelling Machine , required air pressure, and power were considered as predictor variables simultaneously.

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Diesel Engine Parts Fuel Injection Nozzle Dlla160s325n507$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.Diesel Engine Parts Fuel Injection Nozzle Dlla150sm145, 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%)PA12 Transparent Polyamide with Anti-UV Granules. 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.PA12 Resin Suppliers Glass Fiberpolyamide 12 Nylon Granules. Moreover,Diesel Engine Parts Fuel Injection Nozzle Dlla150sm105, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Grade Uns N08330 Stainless Steel Rod, 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 (Health Raw Material L-Carnitine Fumarate CAS.: 90471- 79 -7), maintenance (Diesel Engine Parts Fuel Injection Nozzle Dlla152sm043), 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,Excellent Mechanical High Transparency Transparent Nylon PA12 for Glasses), and annual cost index of mineral processing equipment.Diesel Engine Parts Fuel Injection Nozzle Bdll150s6571, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Diesel Engine Parts Fuel Injection Nozzle 140s6655. Maximum MAER of 13.5% and minimum R2of 0.PA12 Transparent Polyamide with Anti-UV Granules-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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