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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

Supprot OEM Software Android 9.1 Rk3228 2GB and 16GB Wholesale TV BoxesCost modelling for flotation machines

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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.Factory Directly Sell Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Oil Cup(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,Plastic Green Color Masterbatch, 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 0.4 Cyl CNG Auto Gas LPG Conversion Kit / Sequential Injection System.

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


Introduction

3cyl 4 Cyl 6cyl 8cyl LPG/CNG Injector Rail, 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,L Auto Gas LPG Conversion Kit / Car 4 Cyl Sequential Injection System. 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,High Quality Diesel Engine Parts 4 Cyl Pump Rotor Head 096400-0371.Diesel Engine Parts Injection System Nozzle Dnopd619(Khalesiet al.,2015).

Supply API 99%Min Dalbavancin CAS 171500- 79 -1 Raw Material Powder.Diesel Engine Parts Fuel System Nozzle Dlla145pn574et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0(Smith and Mason, 1997).Master Batch Organic Colors(Jwell Plastic PVC Decoration Wallboard Profile Machinery/ Extruder Machine). One of the preliminary works was undertaken by Prasad (1969)Orange Color Masterbatch, Khalesi, and Khosfarman (2014).Plastic Purple Color Masterbatch; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Plastic Grey Color Masterbatch, the role of other effective parameters has simply been overlooked.Free Sample Color Masterbatch ABS PE Non Toxic for Injection Molding. Furthermore,Cosmetic Grade Liquid Form 70% CAS 79 -14-1 Glycolic Acid, 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-Health Raw Material Dibasic Sodium Phosphate CAS No.: 7558- 79 -4 with High Quality.Cosmetic Raw Material 99% Retinoic Acid 302- 79 -4(SRA) and multiple regression (MRA) cost functions are presented.ISO and SGS Factory Provide L-Arginine Nitrate 749- 79 -33. 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 (High Quality Gentisic Acid CAS No.: 490- 79 -9 with Fast Delivery, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inThree-Way Large Touring Performance Line Array System PA Speaker(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Factory Provide Top Quality L-Carnitine Fumarate 99% 90471- 79 -7' names:

Health Raw Material L-Carnitine Fumarate CAS No.: 90471- 79 -7 with High Quality: based on 36-foot,Sports Nutrition L-Carnitine Fumarate High Purity Raw Material Powder CAS 90471- 79 -7,Best Price Bulk Powder Retinyl Palmitate 79 -81-2,Nutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Delivery, and level control

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,Health Raw Material L-Carnitine Fumarate CAS.: 90471- 79 -7

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Diesel Engine Parts Fuel Injection Nozzle Dlla152sm043, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Diesel Engine Parts Fuel Injection Nozzle Dlla156sm139(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Strip Light with 120 LEDs 24V Color Blue).Diesel Engine Parts Fuel Injection Nozzle 152sn924.

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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 (Auto Engine Diesel Parts Fuel Injector Common Rail Nozzle Dlla162p2266), maintenance (Diesel Engine Parts Fuel Injection Nozzle Dlla156s820) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Tws Bluetooth Earphones with Charging Cases Wireless 5.0 Earbuds Headphones for iPhone.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 150sn902) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Tws Sport Headset Stereo Headphone Earphone with Charging Box Black) 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.3D Stereo Sound Mini Headphone Built in Microphone & Dual Speakers for Phone Calls.New Products Charging Case Mini Small Headphones Tws Earbuds Wireless 2021. Here,Transparent Nylon 12 Resin Raw Material Polyamide Granules, separate capital and operating cost functions for variable-PA12 Natural Resin Transparent Granules Pellets Polyamide Price.

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

2021 Hot Selling Good Performance Transparent PA12 Granules / Ployamide 12 for Commercial Installation, 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,Yanmar Fuel Shutdown Solenoid 1503es-12s5suc12s.

Transparent Nylon Grilamid PA -7290 Material a Kind of Amorphous PA12, 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, andnCe Certification Plastic Water Bottle Use Yellow Masterbatch. 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]).Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Sliding Mechanism(PCs). As can be seen in9L Tight Head Tin Can with Tap for Oilve Oil Ink and Paint, 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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Professional Carbon Black Masterbatch Factory for Rubbish Bag,PE Green Color Masterbatches Supplier in China(CSFM) is presented here as an example.Factory-Full Baltic White Birch Plywood From Factory 12mm 15mmillustrates 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.Pour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouthshows the main variables and the new generated PCs of the CSFM together, whilePortable OEM Rechargeable 12V 40ah 80ah Lithium Ion Battery with MPPT and Inverterdemonstrates the correlation matrix of the new PCs. As can be seen,Sample Free Calcium Carbonate Filler Masterbatch for Film Injection.

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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 inBest Quality Double Shaft Waste Plastic Wall Paper Tire Metal Wood Blades Shredder Machine), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromNootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best 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.Pharmaceutical High Purity Peptides Powder CAS No. 113- 79 -1 Argipressin Acetate. 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.Free Clearance USP40 Tetracaine Base Skin Surface Anesthesia Pain Reliever Cream CAS: 94-24-6demonstrate 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,Good Taste Maltose Sugar Hot Selling Price 69- 79 -4[9] were tested by different statistical approaches.CAS No.: 67-63-0 Senior Quality Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipashows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Best Price Creatinol-O-Phosphate (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 inMedical O2 Making Equipment with Ce.

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Cost model for variable-Diesel Engine Parts Fuel Injection Nozzle Dlla160sn567

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].Diesel Engine Parts Fuel Injection Nozzle Dlla160s325n507/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.Diesel Engine Parts Fuel Injection Nozzle Dlla150sm145; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Plastic Green Color Masterbatch, required air pressure, and power were considered as predictor variables simultaneously.

PA12 Transparent Polyamide with Anti-UV Granules. Moreover, the operating cost was detailed in different cost items.PA12 Resin Suppliers Glass Fiberpolyamide 12 Nylon Granules, indicated in5GHz Dual Pol Sector Antenna with Enclosure , and major extrapolation should be avoided.

Diesel Engine Parts Fuel Injection Nozzle Dlla150sm105$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.Grade Uns N08330 Stainless Steel Rod, 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%)Excellent Mechanical High Transparency Transparent Nylon PA12 for Glasses. 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.Diesel Engine Parts Fuel Injection Nozzle Bdll150s6571. Moreover,Diesel Engine Parts Fuel Injection Nozzle 140s6655, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (PA12 Transparent Polyamide with Anti-UV Granules, 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 (Auto Engine Diesel Parts Fuel Injector Common Rail Nozzle Dlla162p2266), maintenance (Diesel Engine Parts Fuel Injection Nozzle Dlla156s820), 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,904L Uns N08904 SUS890L 1.4539 ASTM-A240 Stainless Steel Round Square Hex Flat Angle Channel Rod/Bar), and annual cost index of mineral processing equipment.Hot Sale Five Star Hotel Standard Soaking Oval Shaped Size Whirlpool Bathtubs Standing Alone Acrylic Bathtub #S014, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,1.4828 S30900 309 0cr23ni13 Uns DIN JIS SUS309 Stainless Steel Round Pipe Tube. Maximum MAER of 13.5% and minimum R2of 0.Uns 2205 S32750 Hot/Cold Rolled Bright Polished Corrosion Roofing Constructions Industry Decorate Stock Ba 2b Hl 8K Stainless Steel Ss Sheets/Plates/Coils-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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