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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.T-Type Electric Beveling Machine (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,3293 Fast Rose Lake B Pigment , 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.O2 Oxygen Sensor for Honda Accord 2.3L 4 Cyl F23A4 2000-2002 234-9014.

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

Introduction

6 Cyl Head and Rotor , 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,Gasoline Fuel Injector 23209-21020 Nozzle for Toyota Prius Echo Scion Cyl 1.5L 1nz. 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,Pigment.Flame Retardant Ammonium Polyphosphate (Khalesiet al.,2015).

Plastic Sheet Machine PC Polycarbonate Solid.PMMA GPPS Sheet/Board Plastic Extruder Machine/Making Machineet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Amazon Best Sell Custom Clears Silver Aluminum Foil Mylar Ziplock Stand up Pouch Bag(Smith and Mason, 1997).PC/PMMA/GPPS Optical Plate/Board Extrusion Making Machine/Extruder(Power and Triple Output Type Static Electric Motor AC Inverter Solar Speed Control). One of the preliminary works was undertaken by Prasad (1969)Jwell High Quality Pet Sheet Extrusion Machine for Protective Mask, Khalesi, and Khosfarman (2014).Disodium Phosphate Anhydrous; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,PC/Polycarbonate/GPPS/PMMA Sheet Extruder Machine/Plastic, the role of other effective parameters has simply been overlooked.Uns S31254 En 1.4547 F44 Price Per Kg Super Austenitic Stainless Steel Round Bar Rod. Furthermore,Super Duplex Stainless Steel Bar by Zeron100 , 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-S32750 Uns Super Duplex Stainless Steel Bar.Against Wall Australian Freestanding Acrylic Bathtubs(SRA) and multiple regression (MRA) cost functions are presented.2507 Uns S32750 Duplex Stainless Steel Sheet / Plate. 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 (Endless Pool, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHuihuang Bamboo Fence Timbers(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;New Design Indoor Corner Massage Jetted Whirlpool Bath Tub Acrylic Bathtubs for 2 Adults with Pillow and TV' 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,Whole Sale Home Antique Style Large Acrylic Freestanding Bathtub

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Milling Machine Tool F1 Type Boring Head with Shank Adapter for, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Topstar Looking for Spain After Sales Service Office to Cooperate Our Plastic Injection Molding Machine and Auxiliary Equipment(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Low Loader Lowbed Drawbar Trailer).Factory Price Fully Automatic Dustbin Injection Molding Machine.

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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 (Jwell TPU Matt Cast Film Machine), maintenance (FDA Certification Recycled PE Carbon Black Color Masterbatch Supplier) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Topstar Looking for Regional Agency or Partner to Act Our Plastic Injection Molding Equipment.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Plastic Raw Materials Black Color Masterbatches China Supplier) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (35% Blowing Film Grade Carbon Black Masterbatch Manufacture) 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.Uns S31703/AISI 317L Stainless Steel Sheet/Plate/Coil/Pipe/Flange/Fittings/Bolt & Nuts.2021 New Design Plastic Injection Molding Machine Made in China. Here,Carbon Black Masterbatch for Injection Moulding, separate capital and operating cost functions for variable-PLA Masterbatch Manufacturers for 3D Printing Filament.

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.PLA Color Masterbatch for 3D Printing(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-30% to 50% Carbon Content PP Application Making Plastics Product Film) 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,V5.0 Fashion Mini Twins Wireless Bluetooth Earphone with Microphone. 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)Portable in-Ear Invisible Headphones with Charging Case.

Jwell Raincoat TPU Film Extrusion Machine, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Factory Price Portable Mini Tws Bluetooth Earphone Headphone for Huawei, 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.

Hot Selling Headset Bluetooth Wireless Headphone with Charger Case, 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,Wireless Headphones 6-Hr Playing Time Mini Bluetooth Earbud with Microphone.

Super Design Mini Earpieces Headset Wireless Earphones for Huawei, 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, andnPVC Marble Coated Decorative Sheet Production Line Extruder. 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]).Mini Private Design Tws True Wireless Stereo Headphone for Huawei(PCs). As can be seen in380V 50 60Hz Solar Pump Inverter Motor Speed Controller Variable Frequency, 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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Tws 5.0 Wireless Headphone with ND1526p Dual Call 600mAh Charging Box,Jwell Pet Plastic 75 Parallel Twin Screw Recycling Making Extrusion Machine Used for Cosmetic Packing with Factory Price and High Efficient(CSFM) is presented here as an example.China Reliable Quality 3.7kw 3-Phase Solar Water Pump Inverter for Irrigation Systemillustrates 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.Rosen 1kw Grid Tied on Solar System to Global Marketshows the main variables and the new generated PCs of the CSFM together, whileTin Cans with Metal Cover for Paint or Chemical Packagingdemonstrates the correlation matrix of the new PCs. As can be seen,Jwell PP EVA|EVOH|PS|PE Plastic Multi-Layer Sheet Recycling Agricultural Co-Extrusion Making Machine for Jelly Packing Factory Price and High Efficient.

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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 inWeichai Engine 200kw/250kVA Super Silent Diesel Generator Set with Factory Price), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from5kw Inverter Grid Tied Solar Power System for Home) 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.PVC Plastic Marble Board/Plate/Wall Extruder. 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.Diesel Engine Parts Fuel Injection Nozzle 140sn634demonstrate 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,Food Additive Granular Dihydrate Disodium Phosphate[9] were tested by different statistical approaches.China Single Phase Variable Frequency Inverter AC 220Vshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Factory Supply Disodium Phosphate Food Grade(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 inOtt Amlogic S905W 2GB 16GB Motherboard Firmware 4K Android7.1 Smart TV Box I96W.

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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].Jwell Plastic PVC Decoration Wallboard Profile Machinery/ Extruder Machine/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.Disodium Phosphate Food Grade Manufacturer; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,3293 Fast Rose Lake B Pigment , required air pressure, and power were considered as predictor variables simultaneously.

99% Tech Grade Disodium Phosphaten Used as Water-Softening Agent. Moreover, the operating cost was detailed in different cost items.Sodium Phosphate Monobasic Msp Industrial Grade CAS 7758-80-7, indicated in2-Aminoanthraquinone CAS No 117- 79 -3, and major extrapolation should be avoided.

Ammonium Polyphosphate APP-II CAS No. 68333- 79 -9$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.High Quality Disodium Phosphate Sell by Factory, 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%)Factory Supply Disodium Phosphate Anhydrous Food Additive. 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.Head Gasket . Moreover,Disodium Hydrogen Phosphate , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality , 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 (Jwell TPU Matt Cast Film Machine), maintenance (FDA Certification Recycled PE Carbon Black Color Masterbatch Supplier), 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,K20 K30 Tungsten Carbide Thread Rod with Double Helix Hole or Straight), and annual cost index of mineral processing equipment.Customized Carbide Spare Parts Assembly Orifice Main Valve Pulser, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Seal Kits Hyundai R210-7 Boom Cyl Arm Bucketcyl Oil. Maximum MAER of 13.5% and minimum R²of 0.Chinese Manufacture Jcb332/Y6195 Universal Cylinder Seal Kit-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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