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.Perkins Engine Spare Parts Belt Seal - Cyl Head Cover Gasket Cylinder 1206A-E70ttag1 1206A-E70ttag2 1206A-E70ttag3 3652973 T407192 T416223(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,Swimming SPA Pool Hot Tub Combo, 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.Zhejiang Province Acrylic Standing Alone Bathtubs.

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

Introduction

Rofessional 21 Speed Mountain Bicycle 26 Inch New MTB, 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,Perkins Genuine Cyl Head Assy . 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,Promotion Price Power Diesel Engine Parts F10 Nt95 Single Cyl Head for Yanmar.Chinese Heavy Truck Diesel Engine Pump Cylinder 161500137712(Khalesiet al.,2015).

Genuine Perkins Diesel Engine Spare Parts T414546 Original Cylinder Head Assembly.Jwell  PP Corrugated Roof Sheet Extrusion Machineet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Everun Brand 2021 Ce Approved Er08 Small Compact Wheel Loader with Snow Bucket(Smith and Mason, 1997).Jwell PE 8000mm Width Geomembrane/Waterproof Membrance Roll  Sheet Extrusion Line Making Machine(Jwell PP/PC Sheet Extrusion Equipment). One of the preliminary works was undertaken by Prasad (1969)Perkins Genuine Cyl Cylinder Head Cover Assy 4142X402 for Industrial Diesel Engines, Khalesi, and Khosfarman (2014).Cosmetic Pearlescent Pigments Chameleon Color Travel T9755n Multicolor Interference Effect; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Alcohol Benzene Polyamide Ink Resin, the role of other effective parameters has simply been overlooked.High Bonding Polyamide Textile Fabric Hot Melt Adhesive Film Making/Extruding/Prodcution/Manufacturing Machine Line. Furthermore,Cosmetic Pearlescent Pigments Chameleon Color Travel T9315n Multicolor Interference Effect, 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-Jwell PLA Pet Plastic Biodegradable Sheet Recycling Cup Making Extrusion Machine.Cosmetic Pearlescent Pigments Chameleon Color Travel T8867n Multicolor Metal Effect(SRA) and multiple regression (MRA) cost functions are presented.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. 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 Pearlescent Pigments Chameleon Color Travel T8207n Multicolor Metal Effect Gold Green Blue, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Powerful Cheap Mountain Bike Bicycle' 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,Alcohol Polyamide Resin for Printing Ink

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Popular Alcohol Soluble Polyamide Resin for Gravure Ink, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Polyamide Resin with Benzene Soluble for Printing Inks(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Factory Direct Sale Custom Metal Aluminum Musical Instrument Accessories Guitar Pick Keychain).Alcohol Soluble Polyamide Resin for Printing Ink.

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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 (Supply Rosin Modified Polyamide Resin for Paint), maintenance (Farwell P-Hydroxy Benzaldehyde with High Purity 99.5%) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality Benzaldehyde with Fast Delivery.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Supply Alcohol Soluble Polyamide Resin for Ink) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (CAS No. 151103-09-2 4- ) 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.Sophisticated Price of Polyamide Resin for Whosale.100% Purity Phenol Polyamide Resin. Here,High Polyamide Resin, separate capital and operating cost functions for variable-Water Waste Landfill Industrial Aquaculture and Mining Project Geomembrane Liner Extruder Machine.

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.Hot Sale Hy-688 Polyamide Resin(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-100% High Purity Polyamide Resin for Ink) 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,Jwell-PVC Plastic Rigid Transparent Sheet Thickness 0.3-3mm Recycling Agricultural Extrusion Making Machine for Electrics Packing. 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)Polyamide Resin.

Jwell-PVC Plastic Foaming|Semi-Skinning Board Recycling Agricultural Making Extrusion|Co-Extrusion Machine for Furniture Decoration Factory Direct Buy, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Geomembrane Making Machine, 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.

Spoke Wheel 26-Inch 21-Speed Top with Bicycle, 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,26 Inch Mountain Bike From China Bicycle.

PE Waterproof Roll Extrusion Machine, 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, andnPE Extra-Width Geomembrane/Waterproof Sheet Extrusion Line. 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]).PE Geomembrane/Waterproof Sheet Extrusion Line(PCs). As can be seen inYihe Brand 300-600m Face/Core Veneer Door Furniture Paper Tape Reeling and Gummed for Joining Repairing, 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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Bike Hidden Folding Mountain Ebike Suspension Bicycle,Jwell-PP|PS Stationery Decoration Recycling Making Extrusion Line Machine(CSFM) is presented here as an example.Steel Circle for PA Speaker Parts 16*3h illustrates 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.Bleached Poplar/Birch Carb Plywoodshows the main variables and the new generated PCs of the CSFM together, while49" VGA high performance monitor LCD video wall panel with extention cabledemonstrates the correlation matrix of the new PCs. As can be seen,Factory Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorber.

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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 inEmbossed topsheet disposable breathable dry surface baby pull pants up diapers), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Frequency Converter Variable Speed Drive) 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.Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect Paints. 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.Nordic-Style Latex Three-Person Fabric Sofa Small Household Removable Modern Simple Living Roomdemonstrate 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,Adult Foldable Fold Road Bike MTB Mountain Bicycle Sdc -902[9] were tested by different statistical approaches.40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Codershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect(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 inUnderfloor Heating Mat Floor Systems.

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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].Cosmetic Ultramarine Violet Soap Pigment Matte Manufacturer/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.Cosmetic Grade Ultramarine Violet Manufacturer; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Swimming SPA Pool Hot Tub Combo, required air pressure, and power were considered as predictor variables simultaneously.

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Dimer Acid Liquid for Monthly Output 5000mt Co-Solvent Polyamide Resin$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.Weather Resistance Nylon Polyamide Resin, 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%)High Purity 2. 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.Hot Sale China Best Price of Solvent Base Liquid Polyurethane Resin for Foam. Moreover,SKF NSK Timken Koyo NACHI Snr IKO 3811/530 3811/560 3811/600 3811/630 3811/ 710 3811/750 Taper Roller Bearing Branded Bearings, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Single Row Cylindrical Roller Bearing , 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 (Supply Rosin Modified Polyamide Resin for Paint), maintenance (Farwell P-Hydroxy Benzaldehyde with High Purity 99.5%), 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,Good Wear Resistance and High Tenacity Engineering Plastic 610 for Brush Wire), and annual cost index of mineral processing equipment.OLED Intermediates 2-, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Zys Hot Sale Wind Turbine Bearing 010.30.560/630/ 710. Maximum MAER of 13.5% and minimum R²of 0.Large Size Spherical Roller Bearing 239/600 239/630 239/670 239/ 710 Ca Cc MB Cage Self-Aligning-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Jwell PP EVA|EVOH|PS|PE Plastic Multi-Layer Sheet Recycling Agricultural Co-Extrusion Making Machine for Jelly Packing Factory Price and High EfficientTin Can Manufacturer Customizable Cmyk Automotive Paint Rectangle CansCorresponding author