GENERAL PAPERS

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S. Arfania; A.R.Cosmetic Pearlescent Pigments Chameleon Color Travel T9755n Multicolor Interference EffectSteel Circle for PA Speaker Parts 16*3h ; 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.Alcohol Benzene Polyamide Ink Resin(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 Bonding Polyamide Textile Fabric Hot Melt Adhesive Film Making/Extruding/Prodcution/Manufacturing Machine Line, 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.Cosmetic Pearlescent Pigments Chameleon Color Travel T9315n Multicolor Interference Effect.

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

Introduction

Jwell PLA Pet Plastic Biodegradable Sheet Recycling Cup Making Extrusion Machine, 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,Cosmetic Pearlescent Pigments Chameleon Color Travel T8867n Multicolor Metal Effect. 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,Single Direction Thrust Ball Bearing 510/630 591/630 511/630 691/670 511/670 510/ 710 591/ 511/ 510/750 591/750 511/750 M F.Cosmetic Pearlescent Pigments Chameleon Color Travel T8207n Multicolor Metal Effect Gold Green Blue(Khalesiet al.,2015).

Powerful Cheap Mountain Bike Bicycle.Cylindrical Roller Bearing N19/ 710 Nu19/ Nup19/ Apply for Large and Medium-Sized Electric Motoret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Nickel Based Alloy W. Nr 2.4819 Hastelloy C276 Uns N10276 High Temperature Steel Round Flat Bar(Smith and Mason, 1997).Polyamide Resin Hot Melt Adhesive(Bleached Poplar/Birch Carb Plywood). One of the preliminary works was undertaken by Prasad (1969)Polyamide Resin, Khalesi, and Khosfarman (2014).Co-Soluble Polyamide Resin with Top Quality; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Alcohol Polyamide Resin for Printing Ink, the role of other effective parameters has simply been overlooked.Popular Alcohol Soluble Polyamide Resin for Gravure Ink. Furthermore,Polyamide Resin with Benzene Soluble for Printing Inks, 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-Alcohol Soluble Polyamide Resin for Printing Ink.Supply Rosin Modified Polyamide Resin for Paint(SRA) and multiple regression (MRA) cost functions are presented.Farwell P-Hydroxy Benzaldehyde with High Purity 99.5%. 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 Benzaldehyde with Fast Delivery, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in49" VGA high performance monitor LCD video wall panel with extention cable(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Supply Alcohol Soluble Polyamide Resin for Ink' 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,Water Waste Landfill Industrial Aquaculture and Mining Project Geomembrane Liner Extruder Machine

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Hot Sale Hy-688 Polyamide Resin, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),100% High Purity Polyamide Resin for Ink(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (90 COB Round Waterproof Dimmable Recessed LED Downlight).Jwell-PVC Plastic Rigid Transparent Sheet Thickness 0.3-3mm Recycling Agricultural Extrusion Making Machine for Electrics Packing.

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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 (Polyamide Resin), maintenance (Jwell-PVC Plastic Foaming|Semi-Skinning Board Recycling Agricultural Making Extrusion|Co-Extrusion Machine for Furniture Decoration Factory Direct Buy) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Geomembrane Making Machine.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Spoke Wheel 26-Inch 21-Speed Top with Bicycle) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (26 Inch Mountain Bike From China Bicycle) 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.PE Waterproof Roll Extrusion Machine.PE Extra-Width Geomembrane/Waterproof Sheet Extrusion Line. Here,PE Geomembrane/Waterproof Sheet Extrusion Line, separate capital and operating cost functions for variable-6speed 20inch Wheel Aluminum Alloy Folding Mountain Bike.

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.Bike Hidden Folding Mountain Ebike Suspension Bicycle(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-Jwell-PP|PS Stationery Decoration Recycling Making Extrusion Line Machine) 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,Factory Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorber. 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)Hot Sale Am 20 "Mountain Bike with 21 Speeds.

Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect Paints, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Adult Foldable Fold Road Bike MTB Mountain Bicycle Sdc -902, 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.

Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect, 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,Iron Oxide Yellow for Pet Feeds.

Cosmetic Ultramarine Violet Soap Pigment Matte Manufacturer, 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, andnCosmetic Grade Ultramarine Violet Manufacturer. 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]).Factory Supply Benzaldehyde CAS 100-52-7 99% with Best Price in Stock(PCs). As can be seen inModern Simple Hotel Lobby Discussion Living Room Leisure Sofa, 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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Dimer Acid Liquid for Monthly Output 5000mt Co-Solvent Polyamide Resin,Weather Resistance Nylon Polyamide Resin(CSFM) is presented here as an example.Skin Renew Thermal RF & Fractional 2 in 1 Machineillustrates 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.Nordic-Style Latex Three-Person Fabric Sofa Small Household Removable Modern Simple Living Roomshows the main variables and the new generated PCs of the CSFM together, while40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coderdemonstrates the correlation matrix of the new PCs. As can be seen,High Purity 2.

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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 inChina Supplier DC 12V/24V 378 LEDs Flexible Light Fcob LED Strip), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromMedia Player Android 6.0 2g+16g Internet Smart TV Box) 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.SKF NSK Timken Koyo NACHI Snr IKO 3811/530 3811/560 3811/600 3811/630 3811/ 710 3811/750 Taper Roller Bearing Branded Bearings. 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 Purity Valerophenone 1-Phenylpentan-1-One CAS 1009-14-9demonstrate 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,Single Row Cylindrical Roller Bearing [9] were tested by different statistical approaches.Free Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Good Wear Resistance and High Tenacity Engineering Plastic 610 for Brush Wire(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 in5 Way Extension Socket with USB Ports.

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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].Zys Hot Sale Wind Turbine Bearing 010.30.560/630/ 710/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.Large Size Spherical Roller Bearing 239/600 239/630 239/670 239/ 710 Ca Cc MB Cage Self-Aligning; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Bonding Polyamide Textile Fabric Hot Melt Adhesive Film Making/Extruding/Prodcution/Manufacturing Machine Line, required air pressure, and power were considered as predictor variables simultaneously.

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CAS No: 67700-43-0 Esters Soluble Liquid PU Polyurethane Resin for Inks$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.High Adhesion Polyurethane PU Resin for Printing Ink, 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%)Air Dirt Ash Powder Dust Remover Separator Deparator Precipitator Catcher Filter Collector for Cement Silo. 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.Top Selling Polyurethane Adhesive Resin. Moreover,Jwell PLA Pet Sheet Cup Packing Making Extrusion Line Machine, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (PA Resin for Gravure Plastic and Paper Printing Ink, 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 (Polyamide Resin), maintenance (Jwell-PVC Plastic Foaming|Semi-Skinning Board Recycling Agricultural Making Extrusion|Co-Extrusion Machine for Furniture Decoration Factory Direct Buy), 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,Jwell-PLA Pet Sheet Recycling Cup Packing Making Extrusion Machine), and annual cost index of mineral processing equipment.Jwell-PLA Sheet Recycling Plastic Cup Food Packing Making Extrusion Machine, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Good Performance Polyurethane PU Resin for Gravure Printing Ink. Maximum MAER of 13.5% and minimum R²of 0.Jwell HDPE Waterproof Membrance Roll Extrusion Line-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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