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.Cosmetic Grade 99% Purity All Trans Retinoic Acid 302- 79 -4 Tretinoin/Vitamin a(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,Customized Rubber Spacer Black Silicone Bushing, 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.Gym Rubber Flooring Floor Mat Roll.

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

Introduction

Ihi Turbocharger 2001-04 Peugeot, 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,Gt1749V . 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,2004-10 for Volkswagen.Borg Warner BV45 Turbo 5303-988-0337 Core Chra for Nissan(Khalesiet al.,2015).

T250-04 452055-5004s Turbocharger for Gemini III Engine.Gtb1749vk Turbo Cartridge 798128-0004 for 2011- Peugeot Boxeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Ammonium Polyphosphate (Smith and Mason, 1997).Gt3776D 466819-5004s 1823560c92 Turbo for Ford F650 Navistar(LED Outdoor Lighting Compatible to Amercian and European Niches Swimming Pool Light). One of the preliminary works was undertaken by Prasad (1969)Gt1749vk 798015-0002 A6710900380 Turbo for Ssang-Yong Korando C200 2.0 D20dtf Engine, Khalesi, and Khosfarman (2014).Gt1544V 740611-5002s 28201-2A400 Turbo for Hyundai Verna; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Aftermarket BV45 53039880337 Turbocharger for 2010-12 Nissan Pathfinder Navara Engine, the role of other effective parameters has simply been overlooked.Factory Supply Glycyl-L-Tyrosine. Furthermore,Dl-Isoleucine Powder CAS 443- 79 -8, 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-Glycyl- L-Tyrosine; 658- 79 -7.L-Pyroglutamic Acid(SRA) and multiple regression (MRA) cost functions are presented.Dl-Isoleucine Powder CAS Number 443- 79 -8. 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 (98% Uvarigranol B\C\D\E Standard Reference Materials Plant Extracts, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Longyu Produce Nano Copper Oxide Nanoparticles 1317-38-0' 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,Polyethylene Green Color Masterbatch

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Pipe Bevelling Machine , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),ISO Certificated Company Supply Skin Whitening Retinoic Acid Powder(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (150ml Clear Plastic Bottle with Pump).Green Plastic Masterbatch Blowing Film Grade.

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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 (Green Color HDPE Masterbatch), maintenance (Blue Masterbatch for Film) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Yellow Color Plastic Masterbatch.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Yellow HDPE Masterbatch) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Universal LPG Gas Completed ECU Conversion Kit) 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.Act Best Seller CNG LPG Gas Car Emulator.CNG/LPG Rail Injector Type Gas 4 Cylinders. Here,Act MP 48 ECU Switch/Act 2568d Switch, separate capital and operating cost functions for variable-Fuel Gas Cylinder ECU 2568d Map Sensors.

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.Motorcycle Act 2568d 6cyl 8cyl ECU Conversion Kit(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-Auto Vehicle Gas Conversion Kit CNG Seqential Injection Kits) 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,Electric Pipe End Bevelling Machine. 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)T-Electric Pipe Bevelling Machine .

Pneumatic Pipe Beveling Machine High Performence, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Act CNG LPG Fuel System 2568cyl ECU Kits, 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.

Factory Directly Sell Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Oil Cup, 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,Plastic Green Color Masterbatch.

4 Cyl CNG Auto Gas LPG Conversion Kit / Sequential Injection System, 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, andn3cyl 4 Cyl 6cyl 8cyl LPG/CNG Injector Rail. 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]).L Auto Gas LPG Conversion Kit / Car 4 Cyl Sequential Injection System(PCs). As can be seen inGood Quality Eco-Friendly 500- 800W Electric Motorcycle with Fast Delivery, 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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Diesel Engine Parts Injection System Nozzle Dnopd619,Supply API 99%Min Dalbavancin CAS 171500- 79 -1 Raw Material Powder(CSFM) is presented here as an example.Motorbike for 320cc with Police Cruiser Using Dry Weight 180kgillustrates 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.125541 -22-2 Piperidine 1-N-Boc-4- shows the main variables and the new generated PCs of the CSFM together, whileGuitar / Bass Tuner demonstrates the correlation matrix of the new PCs. As can be seen,Diesel Engine Parts Fuel System Nozzle Dlla145pn574.

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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 inNail Rhombohedral Sequins Set with Laser Flash Varnish), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromCan Beer Use Automatic PE Film Heat Shrink Wrapping Group Packaging Machine for Half Paper Box Juice Production Line) 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.Orange Color Masterbatch. 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.Jwell High Quality Pet Sheet Extrusion Machine for Protective Maskdemonstrate 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,Plastic Purple Color Masterbatch[9] were tested by different statistical approaches.Crystal Nitrogen 21% Agricultural Fertilizershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Plastic Grey Color Masterbatch(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 in300ml Gourd Shape Transparent Green Packer for Moisturizing.

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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 Grade Liquid Form 70% CAS 79 -14-1 Glycolic Acid/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.Health Raw Material Dibasic Sodium Phosphate CAS No.: 7558- 79 -4 with High Quality; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Customized Rubber Spacer Black Silicone Bushing, required air pressure, and power were considered as predictor variables simultaneously.

Cosmetic Raw Material 99% Retinoic Acid 302- 79 -4. Moreover, the operating cost was detailed in different cost items.ISO and SGS Factory Provide L-Arginine Nitrate 749- 79 -33, indicated inMaterial Handling Equipment Manual Hand Pallet Jack, and major extrapolation should be avoided.

High Quality Gentisic Acid CAS No.: 490- 79 -9 with Fast Delivery$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.Factory Provide Top Quality L-Carnitine Fumarate 99% 90471- 79 -7, 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%)Health Raw Material L-Carnitine Fumarate CAS No.: 90471- 79 -7 with High Quality. 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.Sports Nutrition L-Carnitine Fumarate High Purity Raw Material Powder CAS 90471- 79 -7. Moreover,Best Price Bulk Powder Retinyl Palmitate 79 -81-2, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Nutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Delivery, 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 (Green Color HDPE Masterbatch), maintenance (Blue Masterbatch for Film), 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,Health Raw Material L-Carnitine Fumarate CAS.: 90471- 79 -7), and annual cost index of mineral processing equipment.Diesel Engine Parts Fuel Injection Nozzle Dlla152sm043, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Diesel Engine Parts Fuel Injection Nozzle Dlla156sm139. Maximum MAER of 13.5% and minimum R²of 0.Diesel Engine Parts Fuel Injection Nozzle 152sn924-feasibility and even feasibility study level of projects.

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Khalesi, M. R., Zarei, M. J.,Gt1544sm 733783-5007s Turbo for Volkswagen Fox 1.4L Tdi Engine Bnm, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-Tws Bluetooth Earphones with Charging Cases Wireless 5.0 Earbuds Headphones for iPhone.Minerals Engineering,vol. 81. pp. 103-108.         [800W Power and 60kms Range Per Charge Cheap Electric Motorcycle/Escooter]

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Lashgari, A.Tws Sport Headset Stereo Headphone Earphone with Charging Box Black, A.R. 2013.3D Stereo Sound Mini Headphone Built in Microphone & Dual Speakers for Phone Calls,New Products Charging Case Mini Small Headphones Tws Earbuds Wireless 2021,vol. 23. pp. 441-446.         [Tactical Hydration Backpack with 2.5L Water Bladder Thermal Insulation Pack Keeps Liquid Cool up to 4 Hours for Hiking]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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