GENERAL PAPERS

T-Electric Pipe Bevelling Machine Cost modelling for flotation machines

S. Arfania; A.R.Resealable Matte Black Polyethylene Doypack Food Packaging Zipper Stand up BagsL18 /8693 Falante Professional 18inch Subwoofer 1200W New Product China Supplier; 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.Doypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp Bag(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,2-Way Speaker PS10 for High Quality Stage Monitor, 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.Professional Line Array Speaker Single 10 Inch Full Range System.

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

Introduction

Aluminium Foil Zip Lock Food Packaging Bag Manufacturer Plastic, 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,Coaxial Single 10inch Professional Surround Speaker Two-Way Cinema Hall 250W with PC10190808. 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,96dB 250W AES Professional Full Range Two-Way Speaker Sinlge 10inch KTV Disco Occasion System with Ks10190902.Professional Line Array System Single 10 Inch Neodymium Vr10(Khalesiet al.,2015).

Samsung LTI550HN16 1920X1080P monitor LCD video wall.Maunfacturing Price Sealed Food Packaging Vacuum Baget al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Changhong Cj-Series Semi-Automatic High Speed 8 Color Flexographic Printing Machines(Smith and Mason, 1997).Custom Printed Heat Seal Aluminum Plastic Cat Food Packaging Bag Child Resistant Mylar(Professional Manufacturer Everun Er08 CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader). One of the preliminary works was undertaken by Prasad (1969)Silver Zip Lock Aluminium Foil Bag for Gel/ Cosmetic / Three Side Seal Pouch Small Aluminum Bags Plastic Food Packaging Mylar Container Nut, Khalesi, and Khosfarman (2014).Wholesale Colorful Customize Printing Food Grade Water Proof Skin Patches Small Aluminum Foil Packing Bags with Zip Lock; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,10'' Ferrite Woofer Best Price Loudspeaker, the role of other effective parameters has simply been overlooked.Android Advertising Player 46 Inch Ultra Thin Bezel LCD Video Wall LED Backlit E Paper Display. Furthermore,Amazon Best Sell Custom Clears Silver Aluminum Foil Mylar Ziplock Stand up Pouch Bag, 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-Vr36 Dual 10 Inch 3 Way Passive Compact Line Array.Factory Supply Chlorhexidine Acetate/ Mpb Diacetate /CAS 206986- 79 -0(SRA) and multiple regression (MRA) cost functions are presented.Heat Sealing Embossed Plastic Vacuum Packaging Bag for Delicatessen. 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 (Ceftriaxone Sodium 99% API CAS 104376- 79 -6 for Injection Grade, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inIP68 8W-35W Surface Mounted Multi-Color LED Underwater Swimming Light(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Pharmaceutical Powder Vitamin a Acid /Retinoic Acid/ Tretinoin for Skin CAS 302- 79 -4' 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,Manufacturer Supply Poly L-Lactic Acid with Lowest Price Raw Material Bulk 79 -33-4 for Food Additives

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Crovell Factory Supply High Quality CAS 79 -57-2 Oxytetracycline, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Fast Delivery CAS 525- 79 -1 6-Furfurylaminopurine 99%(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (P5.95 Indoor Outdoor Video Screen Panel Stage Rental LED Display).Peptide Cosmetics CAS 155149- 79 -4 Capixyl.

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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 (China O-Phthalaldehyde Opa CAS 643- 79 -8 Raw Crystal 643798 Supplier), maintenance (100% Copper Wire St-1kw Single Phase Dynamo Factory Price) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,China Supplier Antioxidants Powder of Propyl Gallate CAS: 121- 79 -9.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Display) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (49" 450nits LG panel advertising LCD screen ) 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.aluminium LCD wall panel surveillance flat display.3X3 LCD wall panel surveillance digital display screen. Here,AV input LCD wall panel 49inch surveillance monitors, separate capital and operating cost functions for variable-LG panel 49" advertising rack .

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.55inch wall mount LCD panel surveillance LED video(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-Two-Way 10inch Karaoke Full Range Speaker F10+ PA Horn) 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,55 Inch LCD Video Wall Display with Controller. 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)10inch Speaker for Music Bar PRO Audio Sound System.

10inch Professional Karaoke Speaker for Luxury Room, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Samsung 55inch 3X3 Digital Signage Display Screen 3.5mm Narrow Bezel, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

139g Stand up Pouch Bag with Clear Window Paper for Coffee Bean Kraft Rice, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Local Anesthetic Cinchocaine CAS85- 79 -0 for Pain Killer.

Professional Sound System 10'' PRO Neodymium Line Array PA Audio 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).

whereC_eis the estimated cost,C_athe actual cost, andn10inch Loudspeaker PA Speaker PRO Audio. 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]).10 " Professional Home Theater Stage Performance Audio Video PA Trolley IR Bluetooth Active Speaker with Multimedia Heavy Bass and Big Power(PCs). As can be seen inHigh Quality CAS 16595-80-5 Levamisole Hydrochloride/ HCl, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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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Single 10 Inch Active Speaker PS10r2 PA System,Professional Audio Speaker Dual 10 Inch Neodymium Line Array(CSFM) is presented here as an example.Professional Column Speaker Line Array Full Range Loudspeaker Multi-Function L3illustrates 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.2.4- 5GHz MIMO Omni Antenna with 11dBishows the main variables and the new generated PCs of the CSFM together, whileWeifang Cp Cloud Pillar Ce Approved 800kg Multi-Function Mini Loader with Quick Hitch/Electric Joystick/Floating Function for Germany/Norway/Finlanddemonstrates the correlation matrix of the new PCs. As can be seen,Stand up Plastic Bag with Zipper Aluminum Laminated Container Food Packaging.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated in0.75t-9t Vl Type Lever Hoist for Lifting), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from2021 Best Sale 150cc Adults 4 Wheeler Petrol Power Racing Quad) 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.Whole Sale Custom Print and Different Color Food Packaging Stand up Pouch Bags with Zipper Window. 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.High Quality Benzaldehyde with Fast Deliverydemonstrate 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,Food Packaging Grade Customize Plasitc Print Bag with Zipper Stand up Pouch Water Proof Child Resistant Plastic for Candy Ca Weed[9] were tested by different statistical approaches.Portable in-Ear Invisible Headphones with Charging Caseshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Food Packaging Bag(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 inBaby diapers of different size.

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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].Water Proof Child Coffee /Candy/Weed Plastic Container/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.10 Inch Coaxial Speaker Professional Driver " Line Array Subwoofer; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,2-Way Speaker PS10 for High Quality Stage Monitor, required air pressure, and power were considered as predictor variables simultaneously.

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Professional Speaker Double 10'' Neodymium Line Array$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 0.10'' Neodymium Coaxial Speaker. 250W & 60W Power Rating PA Audio., 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%)4-Chloro-4'-Methylbenzophenone High Quality Products CAS 5395- 79 -9. 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.55" HD 1080P Commercial LED Screen Video Wall LCD Display. Moreover,A+ grade LCD wall panel surveillance high brightness screen, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Seamless 1920*1080 Pixel High Resolution LCD Monitor 49", 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 (China O-Phthalaldehyde Opa CAS 643- 79 -8 Raw Crystal 643798 Supplier), maintenance (100% Copper Wire St-1kw Single Phase Dynamo Factory Price), 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,PA 10 -35W 5.25'' Sound Ceiling Speaker), and annual cost index of mineral processing equipment.Samsung LTI550HN16 1920X1080P screen monitor LCD video wall, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Player. Maximum MAER of 13.5% and minimum R²of 0.High Purity Amino Acid L-Arginine Powder-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Water Treatment Softener Dibasic Sodium Phosphate 97% Powder CAS No.: 7558- 79 -4Custom Plastic Vacuum Bag for Rice Packaging Bricks BagsCorresponding author