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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.21kw Grid- Tied Solar Power System with 25 Years Working Time(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,Home Solar System 2kw Panel, 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.Morel Free Shipping 10kw on Grid Tied PV Solar System Home Use for Lighting Heating Air Conditioner.

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

Introduction

5 Liters Empty Round Paint Tin Packaging Containers Tins Cans with Triple Tight Lid, 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,Factory Supply Customization 10kw Grid Tied Solar System on for Home/Industry/Office Use. 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,Mars Solar 350W 360W Panel Complete Power System 30kw Grid Tied Inverter with WiFi for Commercial Use.High Quality 5000W Grid Tied Solar Power Generation System Competitive Price(Khalesiet al.,2015).

843 3kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage.Electric Motorcycle 1000W Motorbike 60V Fast Speed Moped 65km/Het al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Portable-Rorary Type DOT Peen Marking Machine for Metal(Smith and Mason, 1997).Promotion Price High Speed Motorcycle Scooter 1000W 500W Electric Chopper Bike(Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol). One of the preliminary works was undertaken by Prasad (1969)Yangtze 10kw Grid- Tied Solar System, Khalesi, and Khosfarman (2014).Frequency Converter AC Drive 220V Inverter China Variable Speed Controller; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,4 Liter Metal Tin Can F-Style with Lid and Plastic Handle for Oil, the role of other effective parameters has simply been overlooked.Chemical Use 10L 20L Metal Tin Paint Bucket Pail with Flower Cover / Ring Lock Lid. Furthermore,Innopack 16oz 0.5liter Biodegradable Plastic Cold Pressed Juice Bottle with Screw Cap, 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-7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Container.5 Liter Round Empty Protein Powder Jars for Sports Food/HDPE Plastic Container(SRA) and multiple regression (MRA) cost functions are presented.Yn725g Hot Sale Mini Wheel Loader. 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 (Articulated Loader Mini Compact Wheel with Shovel, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDual 10inch 3 Way Professional Stage Line Array Speaker(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Good Quality Empty Metal Tin Paint Glue Cans' 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,Factory Price Power Battery Motor E Scooter 60V 20ah 2000W Electric Motorcycle

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Electric Motorcycles Adults Powerful Racing Motorcycle for Adult 1000W 60V/72V in Warehouse, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Frequency Drive Converter Solar Pump Inverter(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Hot-Selling Waterproof High Quality Unisex Clear Fanny Pack for Outdoor).China E Bike Electric Bicycle 48V 20A Ebike Nakto Motorcycle.

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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 (60V 800 Watt 150kg Load Electric E Bike Motorcycle Moped 45 Km H for 2 Person Adults UK), maintenance (Adult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel Scooter) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,China Single Phase Variable Frequency Inverter AC 220V.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Adult Electric Motorcycle/Scooter 60V20ah Lithium Battery China) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Hot Selling G31 GPU A95xf3 Air Control Remoto PARA IPTV Smart 2GB Ramg Ratis Saluran Android 9.0 Box TV) 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.AC Drive Frequency Variable General Power Supply Solar Motor Pump.Pipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC. Here,500kw Solar Energy System Grid Tied 500kwatt Panel Station, separate capital and operating cost functions for variable-Factory Direct Supply 2 Wheels No Folding Elderly Electric Motorcycle.

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.Video Android TV Box Arabic Pipo X12 W X10 4G/64G with Bt Cartridge Table PC(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-Factory Price 7000W Home Solar Power Generator System Grid Tied) 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,Planer Using VFD AC Drive Frequency Inverters 3pH 380V 11kw. 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)Everun Brand CE Approved Articulated 0.8 Ton Wheel Loader.

Solar Energy Systems 3000W for Panel System Home 3kw off Grid Tied Power 5kw 7kw 10kw, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System, 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.

Yn725g Yineng Mini Wheel Loader, 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,Solar Energy System 5kw Panel Home Grid Tied Power.

Professional Electric Adult Motorcycle 70km/H Cheap Fast Coc Design, 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, andnYn725g 18.5kw No Cabin Yineng Mini Wheel Loader. 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]).Factory Direct Sale City Bike Electric 500W Velo Eectrique Storage Battery Motorcycle 48/60V(PCs). As can be seen inXft- 710 Axial Flow Fire Smoke Fan, 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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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.Outdoor 750MHz One Way CATV Trunk Amplifier shows the main variables and the new generated PCs of the CSFM together, whileBarrow Mini Dumper with Three Wheelsdemonstrates the correlation matrix of the new PCs. As can be seen,Good Quality Factory Directly Electric Motorcycles 500W Bicycle 60V Motorcycle Scooter Adult.

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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 inPre Cut Aluminum Foil Lid for Beverage&Food Packaging), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromGym Rubber Flooring Floor Mat Roll) 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.Adult Electric Motorcycle with Lithium Battery China. 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.Home Solar Energy Storage System 3.2V Battery Bank LiFePO4 100ah 50ah 20ah 10ah Lithium Packdemonstrate 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,Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery[9] were tested by different statistical approaches.80kw Grid Tied Solar System for Commercial or Industrial Useshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle(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 inClothing Ladies Knitted Pullovers with Wool Sweaters.

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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].Solar Inverter Pump Inverters 5.5kw/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.10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solvent; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Home Solar System 2kw Panel, required air pressure, and power were considered as predictor variables simultaneously.

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Pipo X9s Latest Dual Boot Mini PC 2GB 32GB Wins 10+Android 5.1 TV Box 4K Full HD$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 0.6000W Inverter Grid Tied Home Solar Energy System Without Battery, 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%)Solar Pump Inverter DC/ AC Supplier. 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.DC/AC Frequency Inverter Solar Pump Power 400-600V Input 1.5kw. Moreover,Frequnce Converter AC Drive 380V 11kw, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Solar Inverter Pump 15kw, 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 (60V 800 Watt 150kg Load Electric E Bike Motorcycle Moped 45 Km H for 2 Person Adults UK), maintenance (Adult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel Scooter), 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,China Manufacturer 5000W Grid Tied Home Solar Energy System Low Cost), and annual cost index of mineral processing equipment.TUV Ce Europe Popular 6000W Grid Tied Home Solar System, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality X96 Max Android 9.0 Smart 4K Set Top Set-Top 4GB 64GB Firmware Ott TV Box. Maximum MAER of 13.5% and minimum R²of 0.Yn725g Yineng Mini Front End Loader-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Hot Sale and Competitive Price Electric Motorcycle Scooter for Daily.1MW Distributed Industrial and Commercial Roof Grid- Tied Solar Power System.Yangtze Solar Power Grid Tied System Home 5kw 5K, Montreal. 319 pp.         [Cosmetic Grade CAS 79 -14-1 Glycolic Acid Powder]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.AC Fan Frequency Inverter VFD Vector Control 3pH 30kw.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Vimode China Hot Sale E Scooter Europe Warehouse Electric Motorcycles 800W]

Noakes, M. and Lanz, T. 1993.3 Liter High Quality Customized Square Printed Tin Cans for Oil/Paint.Metal Tin with Steel Handle for Paint, Carlton, victoria. 412 pp.         [External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antenna]

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1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [Bfe95% Disposable Protective 3ply Surgical Medical Face Mask for Doctor with Earloop]

1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System, A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.Minerals Engineering,vol. 55. pp. 96-102.         [Plastic Grey Color Masterbatch]

Smith, A.E. and Mason, A.K. 1997. Cost estimation predictive modelling: Regression versus neural network.The Engineering Economist,vol. 42, no. 2. pp. 137-161.         [Top Quality CAS 643- 79 -8 O-Phthalaldehyde]

Stebbins, S.A. 1987. Cost estimation handbook for small placer mines.Information Circular9170, 94. US Bureau of Mines.         [Ophthalmic Optical Pachymeter & Biometer / a Scan ]

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USBM. 1987.AC Fan Frequency Inverter VFD 3pH 15kw,AC Fan Frequency Inverter 3pH 7.5kw-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [IPL RF ND YAG Laser 3 in 1/ E-Light RF Opt Shr Hair Tattoo Removal Multifunction Beauty Machine]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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