GENERAL PAPERS

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S. Arfania; A.R.Additive PE Green Color Masterbatches ManufacturerOil Treatment Packaging Tin Container Can; 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.L18 /86131 Falante Professional 18inch Subwoofer 700W New Product China Supplier Hot Sale(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,L18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium Subwoofer, 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.L18 / 6620- 18 Polegadas PRO Audio Subwoofer Alto Falante 650W.

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

Introduction

OEM Custom Square Rectangle Round Rubber Cover, 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,N21% White Granular Ammonium Sulphate. 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,Vegetable and Fruit Fertilizer Ammonium Sulfate Nitrogen 21%.Agriculture Fertilizer N 21% Ammonium Sulfate(Khalesiet al.,2015).

21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline.Agriculture Fertilizer Nitrogen 21% Ammonium Sulfate China Factoryet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell(Smith and Mason, 1997).Power Steel Grade Nitrogen 20.5% Industrial Ammonium Sulphate Chemical Fertilizer(37'' Ultra Wide Stretched Shelf LCD Screen Monitor Advertisement Display). One of the preliminary works was undertaken by Prasad (1969)White Extrusion Granular Ammonium Sulphate China Factory, Khalesi, and Khosfarman (2014).Granular Grade Ammonium Sulphate N20.5% Nitrogen Fertilizer; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Nitrogen Fertilizer Color Granular Ammonium Sulphate 20.5+24s, the role of other effective parameters has simply been overlooked.China Suppliers Alone Type Wraped Beam Disc Machenism Padlock. Furthermore,Dust Proof Steel Shackle Padlocks with Master Key, 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-Padlock-G38PDP.Breaker Lock(SRA) and multiple regression (MRA) cost functions are presented.Padlock. 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 (Alone Type Wraped Beam Leaves Iron Padlock , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFractional RF Vacuum Slimming Machine for Lose Weight(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Fuso Truck & Bus Turbo Td04 49377-03041 Me201258 for 4m40 Engine Mitsubishi Pajero' 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,Truck Parts Turbocharger for Mercedes-Benz/Chrysler/Dodge Om647 Gt2256 6470900280 736088-0003

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,FPM FKM Viton EPDM SBR Cr Silicone NBR Rubber Parts, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Gt1541V 704765-0003/708450-0018 Turbine Wheel Shaft for 700960-0011(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wooden Pattern Waterproof High Quality Cheap Price Linoleum Flooring).Gt1544sm 733783-5007s Turbo for Volkswagen Fox 1.4L Tdi Engine Bnm.

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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 (Cosmetic Grade 99% Purity All Trans Retinoic Acid 302- 79 -4 Tretinoin/Vitamin a), maintenance (Customized Rubber Spacer Black Silicone Bushing) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Gym Rubber Flooring Floor Mat Roll.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Ihi Turbocharger 2001-04 Peugeot) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Gt1749V ) 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.2004-10 for Volkswagen.Borg Warner BV45 Turbo 5303-988-0337 Core Chra for Nissan. Here,T250-04 452055-5004s Turbocharger for Gemini III Engine, separate capital and operating cost functions for variable-Gtb1749vk Turbo Cartridge 798128-0004 for 2011- Peugeot Boxer.

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.Gt3776D 466819-5004s 1823560c92 Turbo for Ford F650 Navistar(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-Gt1749vk 798015-0002 A6710900380 Turbo for Ssang-Yong Korando C200 2.0 D20dtf Engine) 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,Gt1544V 740611-5002s 28201-2A400 Turbo for Hyundai Verna. 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)Aftermarket BV45 53039880337 Turbocharger for 2010-12 Nissan Pathfinder Navara Engine.

Factory Supply Glycyl-L-Tyrosine, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Dl-Isoleucine Powder CAS 443- 79 -8, 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.

Glycyl- L-Tyrosine; 658- 79 -7, 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,L-Pyroglutamic Acid.

Dl-Isoleucine Powder CAS Number 443- 79 -8, 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, andn98% Uvarigranol B\C\D\E Standard Reference Materials Plant Extracts. 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]).Longyu Produce Nano Copper Oxide Nanoparticles 1317-38-0(PCs). As can be seen inQuadrant Framed Shower Enclosure/ Cabin / Cubicle , 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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Centella Asiatica Extract 99% Asiaticoside 16830-15-2,Crovell Supply Raw Material CAS 104-29-0 Chlorphenesin for Cosmetic(CSFM) is presented here as an example.Solar Panel System 20kw Grid Tied Home Power 20 Kw Energyillustrates 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.Velvet Office Sofa Chair Modern 0302shows the main variables and the new generated PCs of the CSFM together, whileProfessional Audio Speaker System Dual 10 Inch 3 Way Big Line Array Vr36demonstrates the correlation matrix of the new PCs. As can be seen,Food Additive L-Threonic Acid Magnesium Salt/Magnesium L-Threonate CAS No.: 778571-57-6.

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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 inLight Duty Capacity Weight 25kg-45kg Excellent Quality Aluminum Alloy Wooden Door Fire Rated Closer HD-158), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from1% 98% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free) 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.Pipe Bevelling Machine . 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.Dimer Acid Liquid for Monthly Output 5000mt Co-Solvent Polyamide Resindemonstrate 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,ISO Certificated Company Supply Skin Whitening Retinoic Acid Powder[9] were tested by different statistical approaches.New Products Charging Case Mini Small Headphones Tws Earbuds Wireless 2021shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Green Plastic Masterbatch Blowing Film Grade(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 inNew Design Home Application Solar Energy System with FM Radio.

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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].Blue Masterbatch for Film/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.Yellow Color Plastic Masterbatch; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,L18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium Subwoofer, required air pressure, and power were considered as predictor variables simultaneously.

Yellow HDPE Masterbatch. Moreover, the operating cost was detailed in different cost items.Universal LPG Gas Completed ECU Conversion Kit, indicated in2370 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use, and major extrapolation should be avoided.

Act Best Seller CNG LPG Gas Car Emulator$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.CNG/LPG Rail Injector Type Gas 4 Cylinders, 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%)Act MP 48 ECU Switch/Act 2568d Switch. 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.Fuel Gas Cylinder ECU 2568d Map Sensors. Moreover,Motorcycle Act 2568d 6cyl 8cyl ECU Conversion Kit, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Auto Vehicle Gas Conversion Kit CNG Seqential Injection Kits, 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 (Cosmetic Grade 99% Purity All Trans Retinoic Acid 302- 79 -4 Tretinoin/Vitamin a), maintenance (Customized Rubber Spacer Black Silicone Bushing), 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,Electric Pipe End Bevelling Machine), and annual cost index of mineral processing equipment.T-Electric Pipe Bevelling Machine , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Pneumatic Pipe Beveling Machine High Performence. Maximum MAER of 13.5% and minimum R²of 0.Act CNG LPG Fuel System 2568cyl ECU Kits-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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