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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.500W/ 800W Brushless Motor Electric Mobility Scooter for Cargo (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,1L Microstome Metal Drum Customization Printing Logo, 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 0.1L Metal Tin Cans with Lid for Paint or Chemical.

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

Introduction

Free Sample 5GHz Antenna Rubber Gain, 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,Sanland 860MHz 34dB Gain CATV Push-Pull Amplifier Module . 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,1L Printed Round Metal Paint Tin Can with Lid.4G 32g H96 Max 3566 World International Best Custom Internet Digital TV Converter 4K Smart Android Box(Khalesiet al.,2015).

38mm 42mm CATV Plug in 0~20dB Hfc Attenuator Pad.Round Shape Paint Chemical Coating 1L Metal Tin Can / Canister with Lidet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Factory Supply  2-Phenylbenzimidazole  CAS 716- 79 -0 with Best Price(Smith and Mason, 1997).High Quality 18watt RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Two Years Warranty(Sectional Stanford Sofa). One of the preliminary works was undertaken by Prasad (1969)E-Bike / Electric Scooter /Electric Moped 60V/72V 20ah 800W 1kw 2kw, Khalesi, and Khosfarman (2014).Sy-A041 Medical Equipment Portable Ophthalmic Ultrasound a/B Scanner; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Erbium-Doped Fiber Amplifier Optical Power Adjustable , the role of other effective parameters has simply been overlooked.Dirt Bike for 199 Cc Displacement. Furthermore,Sab-500 Ophthalmic a/B Scanner, 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-[Softel]Agile Modulator Full Range CATV Agile Tunable Ah-802h.200cc Reverse Wholesale Motor Light Three Wheel Motorcycle (SRA) and multiple regression (MRA) cost functions are presented.Industrial Energy Saving Device Made in China. 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 (150cc Enclosed Gasoline Motorized Cargo Trike with Box , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inStand-up Ziplock Dried Food Packaging Vacuum Plastic Container(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Xprobe Series Built-in Screen Wireless Probe Type Ultrasound Scanner' 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,Industry Saveing Box

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Motorcyle with Bore * Stroke 66*58.2 mm, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Electricity Saving Device 600amp (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High Efficiency Gas Convection Oven with Proofer/Cake Baking Oven/Convention).250cc Motor Cabin Tricycle Cargo with Canopy.

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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 (Safety Cover Full Mini Enclosed Sealed Fiber Laser UV Marking Machine Price), maintenance (Flexible Label Laser Marking Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Flying Laser Marking System Marker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (800W Color Fashion Electric Motorcycle) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (20W 30W 50W 150X150mm 200X200mm Lens Metal Steel Fiber Laser Machine) 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.Label Marking Equipment Laser Machine for Car Body Labels.Electric Bike 800W ODM Mountain Ebike with Powerful Motor. Here,Latest Electric Scooter 800W Citycoco, separate capital and operating cost functions for variable-16/24 Channel RF Combiner Passive Mixer.

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.150cc Cheap Open Gas Reverse Trike (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-Sport Using Motor Vehicle with Sealed Chain Final Drive) 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,GS-a 12mm CATV Fixed RF Attenuator. 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)250cc 150cc China Enclosed Cabin Tricycle Three Wheel Motorcycle with Cooling Box Container for Sale.

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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.

China 250cc New 3 Wheel Motorcycle Motor Tricycle, 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,3ru 24 in 1 CATV Fixed Channel Modulator .

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whereC_eis the estimated cost,C_athe actual cost, andnSatellite Ts Encryption HD Receiver with Multiplexing Function. 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]).Motor Tricycle Three Wheel Cargo Trike for Sale(PCs). As can be seen in2-30mm Hot Sale Double Sided E0/E1 Glue Melamine/Fancy Plywood for Furniture, 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.Replica Aluminum Alloy Wheels for Jaguar Xe/Xf/Xj/E-Pace/F-Pace/F-Typeshows the main variables and the new generated PCs of the CSFM together, whileHot Sale and Competitive Price Electric Motorcycle Scooter for Dailydemonstrates the correlation matrix of the new PCs. As can be seen,Medical Equipment Ho-200 Ophthalmic a/B Ultrasound Scanner.

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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 inHigh Quality Inner Polish Tungsten Carbide Forming Draw Dies), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPVC Marble Coated Decorative Sheet Production Line Extruder) 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.Outdoor 750MHz One Way CATV Trunk Amplifier . 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.Pest control Flies Cockroaches Mosquitos spray Deltamethrin 2.5%SCdemonstrate 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,China Enclosed Ice Cream Tricycle Three Wheel Cargo with Cooling Box[9] were tested by different statistical approaches.Living Room Furnitureshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.New Racing 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 in2 Gang 4 Wire Rj11 Telephone Outlet.

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Cost model for variable-Cheap 3 Wheel Cargo Tricycle with Box

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].Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital/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.Motorcycle for 1405mm of Wheel Base; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,1L Microstome Metal Drum Customization Printing Logo, required air pressure, and power were considered as predictor variables simultaneously.

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China Ophthalmic Equipment$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.Hot Sale Jincheng Jc200t-8 Scooter Motorcycle with Good Price, 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 Gas Scooters 2 Stroke Euro 4 125cc Moto Moped Motor EPA 49cc 50cc 150cc EEC Motorcycle Gasoline Scooter. 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.Best Selling Ophthalmic Ultrasound a/B Scanner Full Digital Touch Screen. Moreover,Ho-100 Ophthalmic Ultrasound a Scan Pachymeter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler, 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 (Safety Cover Full Mini Enclosed Sealed Fiber Laser UV Marking Machine Price), maintenance (Flexible Label Laser Marking Machine), 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,Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer), and annual cost index of mineral processing equipment.1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint Use, and over- extrapolation could result in misguiding estimates.

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References

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New 50cc Monkey Bike Gasoline Motorcycle Euro 4, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [4GB32GB 4K Android TV Box Digital Display T95X2 with Amlogic S905X2 Internet Quad Core CPU Media]

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USBM. 1987.Lithium Polymer Battery Mica 3.7V Mc602540 550mAh Li Pack for Electronic Device,New Model High Quality 4 Stroke LED Efi 50cc 100cc 110cc Gasoline Scooter Gas Moped Super Soco Bike Mini-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Hot-Selling Croco PU Bum Bag Customized Color & Printed Waist]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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