GENERAL PAPERS

in Line Direct Injection Diesel Engine Used for Generator SetCost modelling for flotation machines

S. Arfania; A.R.10 Inch 2 Ways Self-Powered Active Column Speaker Box Line Array SystemInverter Cabinet VFD Frequency; 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.Two-Way Passive Line Array (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,High Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker, 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.Custom Printed Food Grade Aluminum Foil Plastic Packaging Weed Mylar Bag for Fine Powder Snacks.

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

Introduction

Foil Liquid Packaging Stand up Spout Pouch Food Bag, 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,Smell Proof Waterproof Weed Bag Plastic Food Packaging Child Resistant. 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,Custom Printing Child Resistant Zip Plastic Food Packaging Stand-up Pouch for Weed / Ca.Mylar Child Resistant Waterproof Plastic Bag with Zipper(Khalesiet al.,2015).

Plastic Pouch Custom Water Proof Weed Packaging Food Pack Stand up Bag.Mylar Custom Printed Plastic Weed Bag Stand up Pouch with Zipperet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Custom Liquid Stand up Pouch Spout for Food Packaging(Smith and Mason, 1997).Globally Popular Glycolic Acid CAS Nmber 79 -14-1 with a High Exposure Rate and Favorable Price(99% Pure Powder Novocaine Procaine Factory Bulk Stock CAS: 51-05-8 Europe Free Sample). One of the preliminary works was undertaken by Prasad (1969)Mylar Composite Aluminum Foil Laminated Custom Logo Bag with Ziplock, Khalesi, and Khosfarman (2014).Custom Aluminum Foil Laminated Bag with Zipper; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Purity O-Phthalaldehyde, the role of other effective parameters has simply been overlooked.PRO Audio Dual 10 " 900W Sound System Perfect Line Array Active Speaker. Furthermore,Quality Assurance O-Phthalaldehyde, 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-High Power Speaker Dual 10 " PRO/Professional Audio Line Array .10 Inch Coaxial Speaker Professional Driver 250wrms " Line Array(SRA) and multiple regression (MRA) cost functions are presented.Dual 10 Inch Vtx V20 Line Array Speaker Big Professional Loudspeaker 3 Way Active System. 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 (Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inTx6s H616 4GB 32GB VGA IPTV Brasil Android RAM ROM 6GB 8K 2GB 16GB 10.0 2021 Box TV(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Hrk Provide Topiramate Powder Price CAS 97240- 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,10 " Plywood Professional DSP Active Speaker

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Top Quality CAS 643- 79 -8 O-Phthalaldehyde, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Quality Chemical Product 4- (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Women's Fashion Gold for Dresses).Bluetooth Speaker Indoor Outdoor Party Sound 10 Inch Active Arrray System.

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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 (Public Address System 10 Inch 100V 8ohm High Power 120W Wide Frequency in Ceiling Mount Speaker with Fire Back Dome), maintenance (Pharmaceutical Raw Material CAS 104376- 79 -6 Ceftriaxone Sodium Sterile White Powder) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dual 10inch Powerful Line Array Speaker Ds210.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Hot Sale Free Sample CAS 302- 79 -4 Retinoic Acid with Best Quality) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dual 10 Inch Top and Double 15 Bass Portable Multi-Functional Line Array Speaker System) 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.Cheap Price PRO Sound Professional Audio 10 Inch Speakers 200W.Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease with Fast Delivery. Here,Cold&Heat Seal Plastic Film Roll Chocolate Bar Food Cookies Packaging Bag Frosted Zipper Container Made Craft Drawstring Low MOQ Printing, separate capital and operating cost functions for variable-New Design Beyma Driver Imported Spanish Professional Curve Line Array Speaker Two-Way Bi-AMP Dual 10 Inch110W 500W Ease Technology with Vk210.

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.10 Inch Coaxial Speaker Professional Driver 250wrms " Subwoofer(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-Aicrowe L- ) 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,Diase PRO Audio Dual 10inch Professional Line Array 700W. 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)PS10 High Power 10 Inch Monitor PA Speaker for Live Performance.

Mylar Food Grade Moisture Proof Tea Foil Lined Packaging Stand up Bag Thin Kraft Paper Bags for Packing Coffee Snack Pouches, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Food Grade Vitamin a Palmitate Powder CAS 79 -81-2, 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.

Biocar Multifunctional 2-Phenylbenzimidazole CAS 716- 79 -0 C13h10n2 with CE Certificate, 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 Anesthetics Dibucaine Pharma Raw Powder CAS 85- 79 -0.

10AA50-1 RMS 200 Watts 10 Inch Full Range Woofer with, 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, andnHigh Quality 98% Acrylamid Powder CAS 79 -06 1. 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]).Plastic Laminated Bio Black White Craft Zipper Yemek Paketleme Paper Kraft Packaging Ziplock Bags for Coffee Food(PCs). As can be seen inJwell Plastic PVC Foamed Frame Profile Extrusion Machine, 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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Wholesale Top Quality Retinoic Acid/Retinoic Acid Powder/Tretinoin Powder/Vitamin a CAS 302- 79 -4,10 " Inch Speaker System PRO Audio Entertainment Speakers (CSFM) is presented here as an example.Frequency Inverter Solar Pump Vector Air Compressor Power Transformerillustrates 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.Yn725g 18.5kw No Cabin Yineng Mini Wheel Loadershows the main variables and the new generated PCs of the CSFM together, whileAntique Design Rustic Style Furniture Wax Brown Oak Leg Cream White Linen Fabric Cushions Four Seats Sofademonstrates the correlation matrix of the new PCs. As can be seen,10 -50W 6.5 Inch PA Sound Ceiling Speaker.

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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 inCustom Fashion Smell Proof Transparent Bum Bags Waterproof Beach Kids Purse Jelly PVC Clear Fanny Pack Waist Bag with Adjustable Belt), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHealth Raw Material Dibasic Sodium Phosphate CAS No.: 7558- 79 -4 with High Quality) 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.Dual 10 Inch Indoor and Outdoor Stage Passive/Active Speaker. 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.968 Solar 30kw 40kw on Grid Tie Power System for Factory Roofdemonstrate 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,Custom Plastic Food Contact Packaging Bags[9] were tested by different statistical approaches.Olive Oil Metal Container Edible Tin Can with Plastic Lidshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Dual 10 Inch 600W High-End Stage Line Array PRO Audio(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 inOEM Super Absorbent Cotton Herbal Sanitary Napkins.

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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].Child Resistant Stand up Exit Bag/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.Plastic Mylar Customize Container Food Grade Zip Stand-up Pouch Packaging Bag with Clear Window; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker, required air pressure, and power were considered as predictor variables simultaneously.

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Combo Speaker Professional Loudspeaker /Doule 10'' Line Array System$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.PRO Audio Speaker Dual 10 Inch Professional DSP Active Line Array, 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%)10 " Professional Stage Performance Audio PA Trolley Wireless Bluetooth Active Speaker. 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.Single 10 Inch 2 Way Mini Portable Line Array Speaker. Moreover,China Factory Supply CAS 79 -03-8 Propionyl Chloride with Best Quality, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Pharmaceutical Chemical 1-Hydroxypyrene CAS 5315- 79 -7, 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 (Public Address System 10 Inch 100V 8ohm High Power 120W Wide Frequency in Ceiling Mount Speaker with Fire Back Dome), maintenance (Pharmaceutical Raw Material CAS 104376- 79 -6 Ceftriaxone Sodium Sterile White Powder), 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,Factory Supply Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery), and annual cost index of mineral processing equipment.Polymer Science 2-Phenylbenzimidazole CAS 16- 79 -0, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality Custom Printed Pet Food Packaging Bags. Maximum MAER of 13.5% and minimum R²of 0.Clothes /Cosmetics Plastic Packaging PP Bags PEVA/OPP/ CPE/ Pvf Shoes Shirt Storage Stock Self Heat Sealing-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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