GENERAL PAPERS

Rifamycin S 96% CAS: 13553- 79 -2Cost modelling for flotation machines

S. Arfania; A.R.PE Geomembrane/Waterproof Sheet Extrusion LineGold Dust Collector Cement Filter Bag; 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.6speed 20inch Wheel Aluminum Alloy Folding Mountain Bike(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,Bike Hidden Folding Mountain Ebike Suspension Bicycle, 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.Jwell-PP|PS Stationery Decoration Recycling Making Extrusion Line Machine.

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

Introduction

Factory Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorber, 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,Hot Sale Am 20 "Mountain Bike with 21 Speeds. 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,Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect Paints.Adult Foldable Fold Road Bike MTB Mountain Bicycle Sdc -902(Khalesiet al.,2015).

Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect.Iron Oxide Yellow for Pet Feedset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Melamine Molding Powder for Making Tableware Dishware China(Smith and Mason, 1997).Cosmetic Ultramarine Violet Soap Pigment Matte Manufacturer(Fried Chicken Sweet Chili Sauce Food Packaging). One of the preliminary works was undertaken by Prasad (1969)Cosmetic Grade Ultramarine Violet Manufacturer, Khalesi, and Khosfarman (2014).Factory Supply Benzaldehyde CAS 100-52-7 99% with Best Price in Stock; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Dimer Acid Based Polyamide Resin for The Epoxy Material, the role of other effective parameters has simply been overlooked.Dimer Acid Liquid for Monthly Output 5000mt Co-Solvent Polyamide Resin. Furthermore,Weather Resistance Nylon Polyamide Resin, 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 Purity 2.Hot Sale China Best Price of Solvent Base Liquid Polyurethane Resin for Foam(SRA) and multiple regression (MRA) cost functions are presented.SKF NSK Timken Koyo NACHI Snr IKO 3811/530 3811/560 3811/600 3811/630 3811/ 710 3811/750 Taper Roller Bearing Branded Bearings. 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 (Single Row Cylindrical Roller Bearing , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDyed Skateboard Veneer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Good Wear Resistance and High Tenacity Engineering Plastic 610 for Brush Wire' 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,Dust Collector Machine Wood

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,CAS No: 67700-43-0 Esters Soluble Liquid PU Polyurethane Resin for Inks, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Adhesion Polyurethane PU Resin for Printing Ink(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Used Swamp Track Dozer Cat D5n).Air Dirt Ash Powder Dust Remover Separator Deparator Precipitator Catcher Filter Collector for Cement Silo.

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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 (Top Selling Polyurethane Adhesive Resin), maintenance (Jwell PLA Pet Sheet Cup Packing Making Extrusion Line Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PA Resin for Gravure Plastic and Paper Printing Ink.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Jwell-PLA Pet Sheet Recycling Cup Packing Making Extrusion Machine) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Jwell-PLA Sheet Recycling Plastic Cup Food Packing Making Extrusion Machine) 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.Good Performance Polyurethane PU Resin for Gravure Printing Ink.Jwell HDPE Waterproof Membrance Roll Extrusion Line. Here,Silo Top Pulse Jet Dust Collectors Collector Hopper for Cement, separate capital and operating cost functions for variable-CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film.

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.Dust Collector Woodworking Machinery Supplier(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-PLA Biodegradable Sheet Recycling Cup Making Extrusion 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,Excellent Gel Resistance Ability Polyamide Resin. 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)Jwell PP/PC Sheet Extrusion Equipment.

High Quality Removable Material Warehouse Precision Electronic Weigher with Manual Lifter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Toughness and Tensile Strength Resin 610, 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.

Toughness High Engineering Plastics 610 for Auto Parts, 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,Three Heads Woodworking Machine Atc CNC Router.

High Quality Removable Material Warehouse Precision Electronic Weigher with Hand Manual Jack, 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, andnHDPE Water/Gas Supply Pipe 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]).Automatic Tool Changing CNC Router with 9kw Hsd Spindle. Wood Door Carving Atc(PCs). As can be seen in954 Alicosolar 33kw on Grid Solar Home System with Power Inverter CE/TUV/ISO Cretificate, 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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Disc Atc Automatic Tools Changer Wood CNC Router Woodworking Machine,Tank Dust Removing Machine with Filter Cartridge(CSFM) is presented here as an example.Diesel Engine Parts Fuel Injection Nozzle 150s424n470illustrates 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.Professional Audio System Signal 15" Two-Way Full-Range Speakers PA with Tq15shows the main variables and the new generated PCs of the CSFM together, while150cc Quad 4WD ATV for Adultsdemonstrates the correlation matrix of the new PCs. As can be seen,Quadrant Stainless Steel Shower Room with 8mm Tempered Glass.

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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 inMesh Beach Bag with Cooler Insulated Picnic Waterproof Zipper Tote Bags for Travel), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Speaker with Hanging Hardware Parts Horizontal ) 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.Factory Price 1325 Atc CNC Router Automatic Tool Change Machinery. 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.Portable Fiber Laser Marking Machine for Vin Code/Numberdemonstrate 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,HDPE Water/Gas Supply Pipe Extrusion Equipment[9] were tested by different statistical approaches.Brazilian Spanish Market 99%Pure Lidocaine HCl Drugs USP36shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.45cm High Tray Toughened Glass Curved Quadrant Shower Cabin(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 inBirthday Party Sublimation Porcelain 400ml 600ml Ceramic Coffee Cup with Color Hand From China.

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Cost model for variable-Bathroom 8mm Glass Full Arc Quadrant Enclosed Shower Door

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].Plastic Pipe Production Extrusion Line/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.Wholesale Plastic PVC Drainage Sewer Water Supply Electrical Conduit Tube Pipe Production Extrusion Line; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Bike Hidden Folding Mountain Ebike Suspension Bicycle, required air pressure, and power were considered as predictor variables simultaneously.

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China Direct Supply CAS No.: 63428-84-2 Polyamide Resin for Untreated Film$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.Quadrant Framed Grey Glass Shower Enclosure Sliding Door Simple Room, 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%)HDPE PE PPR Pipe Making Machine. 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.NBR Nitril 80 Duro Rubber X Ring /Quad. Moreover,EPDM 50 Duro As568 Rubber O Ring, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Cheap Price Nice Mini Seal Viton/FKM X Rings, 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 (Top Selling Polyurethane Adhesive Resin), maintenance (Jwell PLA Pet Sheet Cup Packing Making Extrusion Line Machine), 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,Rectangle Sliding Strip Glass Door Quadrant Bathroom ), and annual cost index of mineral processing equipment.Shurong Made Insecticide Deltamethrin 2.5% Ec CAS No. 52918-63-5, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Shower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Enclosure AS3912T-90. Maximum MAER of 13.5% and minimum R²of 0.PVC CPVC UPVC Material Conduit Gas Water Supply and Drainage Pipe Extrusion Production 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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