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.Hot Cheap Electric Scooter for Two Seats 60V800W20ah with USB Charger(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,Bl-Xgw Electric Motorcycle, 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.Yineng Yn725 Mini Wheel Loader 18.5kw Cabin.

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

Introduction

Yn725 Mini Small Perkins Engine Wheel Loader, 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,21kw Grid- Tied Solar Power System with 25 Years Working Time. 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,Home Solar System 2kw Panel.Morel Free Shipping 10kw on Grid Tied PV Solar System Home Use for Lighting Heating Air Conditioner(Khalesiet al.,2015).

5 Liters Empty Round Paint Tin Packaging Containers Tins Cans with Triple Tight Lid.Factory Supply Customization 10kw Grid Tied Solar System on for Home/Industry/Office Useet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Hot Sale Coolest China Cheap Electric Motorcycle 500W/ 800W /1000W/2000W Scooter(Smith and Mason, 1997).Mars Solar 350W 360W Panel Complete Power System 30kw Grid Tied Inverter with WiFi for Commercial Use(Electric Motorcycle 1000W Motorbike 60V Fast Speed Moped 65km/H). One of the preliminary works was undertaken by Prasad (1969)High Quality 5000W Grid Tied Solar Power Generation System Competitive Price, Khalesi, and Khosfarman (2014).843 3kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Electric Motorcycle 1000W Motorbike 60V Fast Speed Moped 65km/H, the role of other effective parameters has simply been overlooked.Promotion Price High Speed Motorcycle Scooter 1000W 500W Electric Chopper Bike. Furthermore,Yangtze 10kw Grid- Tied Solar System, 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-Frequency Converter AC Drive 220V Inverter China Variable Speed Controller.4 Liter Metal Tin Can F-Style with Lid and Plastic Handle for Oil(SRA) and multiple regression (MRA) cost functions are presented.Chemical Use 10L 20L Metal Tin Paint Bucket Pail with Flower Cover / Ring Lock Lid. 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 (Innopack 16oz 0.5liter Biodegradable Plastic Cold Pressed Juice Bottle with Screw Cap, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inTop Quality Tretinoin Powder  Retinoic Acid for Skin Care(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Container' 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,Everun 0.8ton Chinese Articulated Mini Wheel Loader

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Yn725 Yineng Mini Wheel Loader 1t 0.5cbm Capacity, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),500ml Round Resealable Tin Can with Easy Open Screw Top Lid(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Best Selling Waterproof Roof Top Tent Car Camping).Compact wheel loader snow pusher landscaping.

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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 (Factory Price Power Battery Motor E Scooter 60V 20ah 2000W Electric Motorcycle), maintenance (Electric Motorcycles Adults Powerful Racing Motorcycle for Adult 1000W 60V/72V in Warehouse) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Frequency Drive Converter Solar Pump Inverter.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (China E Bike Electric Bicycle 48V 20A Ebike Nakto Motorcycle) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (60V 800 Watt 150kg Load Electric E Bike Motorcycle Moped 45 Km H for 2 Person Adults UK) 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.Adult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel Scooter.China Single Phase Variable Frequency Inverter AC 220V. Here,Adult Electric Motorcycle/Scooter 60V20ah Lithium Battery China, separate capital and operating cost functions for variable-Hot Selling G31 GPU A95xf3 Air Control Remoto PARA IPTV Smart 2GB Ramg Ratis Saluran Android 9.0 Box TV.

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.AC Drive Frequency Variable General Power Supply Solar Motor Pump(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-Pipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC) 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,500kw Solar Energy System Grid Tied 500kwatt Panel Station. 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)Factory Direct Supply 2 Wheels No Folding Elderly Electric Motorcycle.

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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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,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, 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, andn1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System. 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]).Yn725g Yineng Mini Wheel Loader(PCs). As can be seen inDual 10inch 3 Way Professional Stage Line Array Speaker, 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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Professional Electric Adult Motorcycle 70km/H Cheap Fast Coc Design,Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader(CSFM) is presented here as an example.Xft- 710 Axial Flow Fire Smoke Fanillustrates 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.Nitrogen Fertilizer Ammonium Sulphate for Agricultureshows the main variables and the new generated PCs of the CSFM together, whileDouble 10 Inch Line Array PRO Audio demonstrates the correlation matrix of the new PCs. As can be seen,Factory Direct Sale City Bike Electric 500W Velo Eectrique Storage Battery Motorcycle 48/60V.

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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 inPoly Bubble Mailer Kraft Envelope Wrap Mailing Bag Courier Satchel), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromFree Sample Ortho Phthalaldehyde 643- 79 -8 with Fast Delivery Manufacture in China) 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.Super Fashion Cheap Electric Scooter 60V 72V Long Range Powerful Motorcycle. 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.Gym Rubber Flooring Floor Mat Rolldemonstrate 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,Empty Gal Metal Round Tin Can 118ml 4oz Bundi PVC Pipe Glue Bottle with Brush[9] were tested by different statistical approaches.Heavy Duty Tricycle 250ccshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Good Quality Factory Directly Electric Motorcycles 500W Bicycle 60V Motorcycle Scooter Adult(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 inPerfume Atomizer.

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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].Adult Electric Motorcycle with Lithium Battery China/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.Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Bl-Xgw Electric Motorcycle, required air pressure, and power were considered as predictor variables simultaneously.

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Solar Inverter Pump Inverters 5.5kw$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 0.10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solvent, 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%)350ml Brake Fluid Glue Tin Bottle. 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.9L Tight Head Tin Can with Tap for Oilve Oil Ink and Paint. Moreover,Pipo X9s Latest Dual Boot Mini PC 2GB 32GB Wins 10+Android 5.1 TV Box 4K Full HD, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (6000W Inverter Grid Tied Home Solar Energy System Without Battery, 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 (Factory Price Power Battery Motor E Scooter 60V 20ah 2000W Electric Motorcycle), maintenance (Electric Motorcycles Adults Powerful Racing Motorcycle for Adult 1000W 60V/72V in Warehouse), 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,Solar Pump Inverter DC/ AC Supplier), and annual cost index of mineral processing equipment.DC/AC Frequency Inverter Solar Pump Power 400-600V Input 1.5kw, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Frequnce Converter AC Drive 380V 11kw. Maximum MAER of 13.5% and minimum R²of 0.Solar Inverter Pump 15kw-feasibility and even feasibility study level of projects.

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Khalesi, M. R., Zarei, M. J.,Factory Wholesale Tx3 S905X3 Quad Core Bt 4.1 Great Arabic 64bit 4GB 64GB TV Box Android, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-High Quality X96 Max Android 9.0 Smart 4K Set Top Set-Top 4GB 64GB Firmware Ott TV Box.Minerals Engineering,vol. 81. pp. 103-108.         [Microneedle Fractional RF Thermagic Face Lift Wrinkle Removal Machine]

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Everun Brand CE Certificated Articulated 0.8 Ton China Shovel Loader.PNG Easy Install 12kw 15kw Grid Tied System with Home Delivery Service.Solar Energy System 5kw Panel Home Grid Tied Power 6kw 8kw 10kw, Montreal. 319 pp.         [Titan Brand Mini Small Chargeur De Roues Radlader Gommata Carregador Roda Cargador Ruedaschargeur Tracteur Traktorlader Caricatore Trattore D]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Safe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse3HP Three Phase Frequency ConverterCorresponding author