GENERAL PAPERS

Food Grade Lactic Acid 79 -33-4Cost modelling for flotation machines

S. Arfania; A.R.Engine Interface Model Eim 630-465 630-466 630-088 Olympian Massey Module Replace Fg Wilson Speed Controller 258 -9753 -9755 12V 24VFruit and Vegetables Packaging Materials Vacuum Nylon 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.Diesel Engine Set Wilson Parts Eim Module Interface C3.3 C4.4 Motorcycle Generator Auto Spare 258 -9753 -9755 12V 24V(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,5kw 10kw Stc Three Phase AC Synchronous 15kw Brush Alternator, 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.Replace Fg Wilson Engine Interface Module Eim Plus Basic 258 -9755 -9753.

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

Introduction

Engine Controller Model Eim Basic 258 -9756, 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,Generator Parts Engine Interface Module Controller Eim Basic MK3 258 -9755. 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,Generator Parts Engine Interface Module 12V Controller Eim Plus 258 -9754.100% Copper Wire St Series Single Phase Generator / Alternator (Khalesiet al.,2015).

China Supplier 1.100% Copper Wire Stc Series Three Phase AC Dynamo/Generator /  Alternator et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 150cc ATV for Adults Lmatv-150hm(Smith and Mason, 1997).Stc-3 3kw Stc-5 5kw Stc-10 10kw Three Phase Alternator(Face Veneer Nature Bamboo for Fancy Plywood). One of the preliminary works was undertaken by Prasad (1969)24kVA St Series Single Phase Generator , Khalesi, and Khosfarman (2014).20 Days Delivery! 100% Copper Wire Stc-3kw Three Phase Alternator; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,20kVA St Series Single Phase Generator , the role of other effective parameters has simply been overlooked.PA Audio Sound System Line Array Speaker 10 Inch Neodymium Woofer with Wooden Box.. Furthermore,7.5kVA St Series Single Phase Generator , 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-Wholesale 8inch 10inch 12 Inch 15inch DJ Speakers Professional Stage Audio.2 Way Passive 10 " Professional PRO Audio PA Line Array(SRA) and multiple regression (MRA) cost functions are presented.Stc Series Three Phase Dynamo Generator . 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 (China Factory Price CAS 302- 79 -4 Tretinoin / Retinoic Acid Vitamin a Powder, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina Ophthalmic Equipment(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Stc Series Three Phase Dynamo Generator ' 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,Veterinary Use Bulk Pirce of Oxytetracycline CAS: 79 -57-2

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,100% Copper Wire St-7.5kw Single Phase Alternator Factory Price, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),100% Copper Wire St-5kw Single Phase Brush Generator(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Customized UPVC Single Casement Door/Exterior Door/Plastic Patio Door).Home Theater Speaker.

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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 (Dual 6" Coaxial Full Range Speaker for Entertainment Room), maintenance (12inch Stage Monitor Speaker) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,KTV Single 8" Full Range Audio&Sets.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (St-2kw 230V/50Hz Single Phase Brush Alternator for Sale) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Stc-12kw/15kVA Three Phase AC Electric Generator on Sale) 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.St 5kw Single Phase AC Electric Alternator Generator.Wilson Parts Eim Module Engine Interface 258 -9753 2589755 Control. Here,258 -9754 Electric Engine Interface Moudle 12V Eim Basic, separate capital and operating cost functions for variable-12inch Loudspeakers Professional Stage Outdoor Speaker Full Range Audio.

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.Android Digital Signage Intelligent Hand Sanitizer Display(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-55 Inch Outdoor Double-Side LCD Display Self Service Airport Kiosk Touch Screen Multimedia Information) 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,New Brand Diesel Engine with Four Stroke Multy-Cylinder Used for Generator Set. 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)LCD Digital Signage 21.5 Inch Automatic Induction Hand Sanitizer Billboards.

43" Dual Screen LCD Ad Player Full HD Double Display All in One No Touch Android Advertise System, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Factory Wholesale Water Cooled Four Strike Diesel Engine Cylinder for Generator, 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.

10 " Woofer Speaker, 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,High Brightness Stand Alone Advertising Kiosk for Government.

Factory Nitrogen Fertilizer Ammonium Sulphate 20.5%N Steel Grade for Agriculture, 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 Speed 258kw 6 Cylinder Industrial Diesel Engine for Electric. 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]).21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline(PCs). As can be seen in5 Liter Round Empty Protein Powder Jars for Sports Food/HDPE Plastic Container, 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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Water Cooled Diesel Engine Color Custom for Power Generator Set,Direct Injection Diesel Engine with 6-Cylinder 4-Stroke Used for Electric Generator Sets(CSFM) is presented here as an example.Hot Sale Factory Direct Cheap New Model Electric Bicycle Convenient Motorcycle Best Price in CKD forillustrates 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.Co-Solvent Polyamide Resin for Untreated Film Printing Inkshows the main variables and the new generated PCs of the CSFM together, whileNew Products Lift Recliner Chair Sofa demonstrates the correlation matrix of the new PCs. As can be seen,Nitrogen Fertilizers Agriculture N20.5% Granular Ammonium Sulphate.

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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 inCar Badge 2021 Chrome Emblem Eagle Custom Label Badges), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from2021 Selling The Best Quality Cost-Effective Products LED Swimming Pool Light with Two Years Warranty) 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.White Crystalline Ammonium Sulphate for Compound Fertilizer. 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.43''46''55''65''75'' Commercial LCD Screen Display Full Color Waterproof Sunglight Readable Android Touch Monitor Kioskdemonstrate 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,Deisel Engine for Silent Power Generator with 6-Cylinder[9] were tested by different statistical approaches.Professional Powered Line Array Selfpowered Speakers Active Systemshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.in Line Multy-Cylinder Diesel Engine for Power Generator Set(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 inCold Shrink Splice with Inside Mastic for Insulation Protection.

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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].in Line Direct Injection Diesel Engine Used for Generator Set/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.Color Custom Diesel Engine with Four-Stroke for Gensets; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,5kw 10kw Stc Three Phase AC Synchronous 15kw Brush Alternator, required air pressure, and power were considered as predictor variables simultaneously.

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Direct Injection Water Cooled Diesel Engine for Generator Set$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.Water Cooled Cylinder Diesel Engine Used for Generator Set, 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%)Nitrogen 21% Granular Fertilizer Ammonium Sulphate. 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.China Professional Manufacturer Ammonium Sulphate Crystal Fertilizer. Moreover,Best Price Fertilizer Ammonium Sulphate N21% Min, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Nitrogen Fertilizer N21% Min Ammonium Sulphate White Granular, 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 (Dual 6" Coaxial Full Range Speaker for Entertainment Room), maintenance (12inch Stage Monitor Speaker), 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,Wholesale Ammonium Sulphate with SGS and Coa Certificate), and annual cost index of mineral processing equipment.Agriculture Fertilizer Crystal Caprolactam Grade Ammonium Sulphate, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Color Custom Diesel Engine Used for Generator Set with Four-Stroke. Maximum MAER of 13.5% and minimum R²of 0.Ammonium Sulphate N21% Powder+Crystal+Granular Steel+Capro-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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