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.Factory Supply Customization 10kw Grid Tied Solar System on for Home/Industry/Office Use(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,Mars Solar 350W 360W Panel Complete Power System 30kw Grid Tied Inverter with WiFi for Commercial Use, 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.High Quality 5000W Grid Tied Solar Power Generation System Competitive Price.

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

Introduction

843 3kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage, 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,Electric Motorcycle 1000W Motorbike 60V Fast Speed Moped 65km/H. 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,Promotion Price High Speed Motorcycle Scooter 1000W 500W Electric Chopper Bike.Yangtze 10kw Grid- Tied Solar System(Khalesiet al.,2015).

Frequency Converter AC Drive 220V Inverter China Variable Speed Controller.4 Liter Metal Tin Can F-Style with Lid and Plastic Handle for Oilet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Cosmetic Grade L-Arginine with High Quality(Smith and Mason, 1997).Chemical Use 10L 20L Metal Tin Paint Bucket Pail with Flower Cover / Ring Lock Lid(Professional Active Line Array Loudspeaker Low Frequency Coaxial 12-Inch Neodymium Speaker). One of the preliminary works was undertaken by Prasad (1969)Innopack 16oz 0.5liter Biodegradable Plastic Cold Pressed Juice Bottle with Screw Cap, Khalesi, and Khosfarman (2014).7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Container; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,5 Liter Round Empty Protein Powder Jars for Sports Food/HDPE Plastic Container, the role of other effective parameters has simply been overlooked.Yn725g Hot Sale Mini Wheel Loader. Furthermore,Articulated Loader Mini Compact Wheel with Shovel, 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-Good Quality Empty Metal Tin Paint Glue Cans.Everun 0.8ton Chinese Articulated Mini Wheel Loader(SRA) and multiple regression (MRA) cost functions are presented.Yn725 Yineng Mini Wheel Loader 1t 0.5cbm Capacity. 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 (500ml Round Resealable Tin Can with Easy Open Screw Top Lid, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inXft- 710 Axial Flow Fire Smoke Fan(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Compact wheel loader snow pusher landscaping' 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,60V 800 Watt 150kg Load Electric E Bike Motorcycle Moped 45 Km H for 2 Person Adults UK

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Adult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel Scooter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),China Single Phase Variable Frequency Inverter AC 220V(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Hot Forged Round Bar SKD11 D2 1.2379 Alloy Tool Steel).Adult Electric Motorcycle/Scooter 60V20ah Lithium Battery China.

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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 (Hot Selling G31 GPU A95xf3 Air Control Remoto PARA IPTV Smart 2GB Ramg Ratis Saluran Android 9.0 Box TV), maintenance (AC Drive Frequency Variable General Power Supply Solar Motor Pump) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Pipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (500kw Solar Energy System Grid Tied 500kwatt Panel Station) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Factory Direct Supply 2 Wheels No Folding Elderly Electric Motorcycle) 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.Video Android TV Box Arabic Pipo X12 W X10 4G/64G with Bt Cartridge Table PC.Factory Price 7000W Home Solar Power Generator System Grid Tied. Here,Planer Using VFD AC Drive Frequency Inverters 3pH 380V 11kw, separate capital and operating cost functions for variable-Everun Brand CE Approved Articulated 0.8 Ton Wheel Loader.

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.Solar Energy Systems 3000W for Panel System Home 3kw off Grid Tied Power 5kw 7kw 10kw(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-1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System) 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,Yn725g Yineng Mini Wheel Loader. 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)Solar Energy System 5kw Panel Home Grid Tied Power.

Professional Electric Adult Motorcycle 70km/H Cheap Fast Coc Design, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader, 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 Direct Sale City Bike Electric 500W Velo Eectrique Storage Battery Motorcycle 48/60V, 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,Haolin Lithium Battery 60V/20ah.

Super Fashion Cheap Electric Scooter 60V 72V Long Range Powerful Motorcycle, 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, andnEmpty Gal Metal Round Tin Can 118ml 4oz Bundi PVC Pipe Glue Bottle with Brush. 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]).Good Quality Factory Directly Electric Motorcycles 500W Bicycle 60V Motorcycle Scooter Adult(PCs). As can be seen inDouble 10 Inch Line Array PRO Audio , 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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Adult Electric Motorcycle with Lithium Battery China,Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery(CSFM) is presented here as an example.Barrow Mini Dumper with Three Wheelsillustrates 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.Free Sample Ortho Phthalaldehyde 643- 79 -8 with Fast Delivery Manufacture in Chinashows the main variables and the new generated PCs of the CSFM together, whileL5 Nylon Mining Loader OTR Tyre 20.5-25 off-The-Road Tiredemonstrates the correlation matrix of the new PCs. As can be seen,Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle.

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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 in3D Wheel Alignment and Tyre Changer Balancing Machine Combo Discount Price), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHome Solar Energy Storage System 3.2V Battery Bank LiFePO4 100ah 50ah 20ah 10ah Lithium Pack) 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.Solar Inverter Pump Inverters 5.5kw. 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.Yn725 Yineng Mini Wheel Loader 18.5kw Cabindemonstrate 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,10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solvent[9] were tested by different statistical approaches.OEM Wheels for Kymco Gy6 125cc Scooter Body Partsshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.350ml Brake Fluid Glue Tin Bottle(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 in125kVA/100kw Rain and Dustproof Diesel Engine Generator Set with OEM Factory Price.

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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].Pipo X9s Latest Dual Boot Mini PC 2GB 32GB Wins 10+Android 5.1 TV Box 4K Full HD/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.6000W Inverter Grid Tied Home Solar Energy System Without Battery; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Mars Solar 350W 360W Panel Complete Power System 30kw Grid Tied Inverter with WiFi for Commercial Use, required air pressure, and power were considered as predictor variables simultaneously.

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Frequnce Converter AC Drive 380V 11kw$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.Solar Inverter Pump 15kw, 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%)China Manufacturer 5000W Grid Tied Home Solar Energy System Low Cost. 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.TUV Ce Europe Popular 6000W Grid Tied Home Solar System. Moreover,High Quality X96 Max Android 9.0 Smart 4K Set Top Set-Top 4GB 64GB Firmware Ott TV Box, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Yn725g Yineng Mini Front End Loader, 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 (Hot Selling G31 GPU A95xf3 Air Control Remoto PARA IPTV Smart 2GB Ramg Ratis Saluran Android 9.0 Box TV), maintenance (AC Drive Frequency Variable General Power Supply Solar Motor Pump), 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 Everun Er408 Small Loader Compact with Pallet Forks), and annual cost index of mineral processing equipment.Yn725g 18.5 Kw/2, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,1392 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System. Maximum MAER of 13.5% and minimum R²of 0.Yn725g 18.5kw Cabin Yineng Mini Wheel Loader-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.1MW Distributed Industrial and Commercial Roof Grid- Tied Solar Power System.AC Fan Frequency Inverter VFD Vector Control 3pH 30kw.3 Liter High Quality Customized Square Printed Tin Cans for Oil/Paint, Montreal. 265 pp.         [Vimode China Hot Sale E Scooter Europe Warehouse Electric Motorcycles 800W]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Metal Tin with Steel Handle for Paint.Innopack 500ml Round Conveyor Belt Glue Tin Can with Caps.3 Liter High Quality Customized Square Printed Tin Cans for Oil/Paint, Montreal. 319 pp.         [External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antenna]

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Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Inverter Cabinet VFD Frequency AC Drive 55kw.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Top Quality CAS 643- 79 -8 O-Phthalaldehyde]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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