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.High Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports(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,Quality 18mm Carb Birch Okoumen Plywood, 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.Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale.

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

Introduction

30kw Grid Tied Solar Power System Home Popular in Philippines, 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,New Condition Large Capacity Mini Truck Dumper. 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,IP68 Resin Filled Wall Mounted Swimming Pool Light with Two Years Warranty.50cc 150cc 200CCC 300cc Adult EPA/Ce 3 Wheel Gas Scooter(Khalesiet al.,2015).

2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip.150ml Plastic Clear White Bullet Liquid Bottle for Cosmetic Industryet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Quality Motorcycle Parts Cam (Smith and Mason, 1997).14" to 22' Inch Replica Aluminum Alloy Wheel for KIA Rims(Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder). One of the preliminary works was undertaken by Prasad (1969)Electric Three Wheel Motorcycle Transaxle Cargo Tricycle Rear Axle 800W 1500W 1800W 2000W Full Floating 0.5ton~1.2ton Accessories, Khalesi, and Khosfarman (2014).300cc Cargo Tricycle of Asia Market; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Building Material Commercial Plywood with Carb to Europe, the role of other effective parameters has simply been overlooked.AL908 800kg Rated Load Wheel Loader with CE Approved for Sale. Furthermore,China Jiaxing Jarol Frequency Inverter 0.75kw/220V New, 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-Portable Laptop Digital Automatic Ultrasound Bone Densitometer.Haiqin Brand 0.8ton Mini Loader (SRA) and multiple regression (MRA) cost functions are presented.Jarol Solar Inverter 5.5kw 3 Phase. 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 (Hardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certification, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHot Sale 48V 20ah Powerful Chinese Chopper Electric Motorcycle 350W for Adults(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Textile Crane Centrifugal 380V Variable Frequency Drive VFD' 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,12V RGB Resin Filled Underwater Pool Lights with 2 Years Warranty

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,loader with excavator grapple wheel mini for sale good quality, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Best Distributor Factory Exports Saso Ce UL 5W E27 Bulb Energy Saving LED Lighting Made in China for Office).2ND Generation Ultrasound Bone Densitometer.

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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 (Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series), maintenance (Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Effective Automatic Ultrasound Bone Densitometer.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Low Price Ophthalmic a-Scan Ultrasound with Pachymeter Ho-100) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (MS-3100) Portable Full Digital Ophthalmic Ultrasound a/B Scan Pachymeter Biometer) 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.4.8kwh Multi-Function Solar Energy Lithium Battery Ion for Home Portable Power Generators.Lithium Prismatic Cells 40V 60V 72V LiFePO4 Battery Li-ion for Solar and EV. Here,Lithium Ion Battery Pack 48V 60V 72V 20ah Batteries for Electric Scooter and Club Car, separate capital and operating cost functions for variable-12V 24V 48V 40ah Lithium Battery Solar 100ah 150ah 200ah 300ah 400ah 500ah Energy Storage.

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.5L Metal Round Cans for Paint or Chemical Packaging(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-150cc Motorcycle) 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,5L Vegetable Cooking Oil Custom Tinplate Square Can. 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)Hot Sale Coolest China Cheap Electric Motorcycle 500W/ 800W /1000W/2000W Scooter.

Wholesale Plastic Square 1 Liter Fertilizer Bottle, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithium, 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.

50cc Motorcycle, 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,Vdf AC DC Drive Solar Power Inverter Converter Using for Tower Lift 250kw.

Zhenhua Classic Motorcycle Dax 125cc Euro4, 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, andnSuper Cooling Smart Electric Scooter 500W 800W Motorcycle. 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]).Wholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Caps(PCs). As can be seen in55 Inch LCD Video Wall Display with Controller, 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.Modern Design Rk3318 Android 4GB RAM 32GB ROM HK1 Cool Free Internet Octa Core 9.0 Set Top TV Boxshows the main variables and the new generated PCs of the CSFM together, while3HP 1 Phase Frequency Converterdemonstrates the correlation matrix of the new PCs. As can be seen,2.4/ 5GHz 10dBi Rubber WiFi Antenna.

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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 inExcellent Freight Ocean Shipping Service From China to Belgium), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromElectric Motorcycle) 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 0.5GHz 18dBi Sector WiFi Antenna. 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.1L Custom Metal Round Tin Cans Box Packaging for Glue Coating Sloventdemonstrate 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,125cc Retro Scooter Motorcycle[9] were tested by different statistical approaches.Chinese Heavy Truck Diesel Engine Pump Cylinder 161500137712shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Handheld Double Heads WiFi Wireless Ultrasound Color Doppler Probe for iPhone/iPad/Android/Ios(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 inJbw- 300b /500b Metal Impact Testing Machine with Computer Control.

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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].Lady's E-Scooter 800W Hot Sale Made in 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.High Quality Electric Motorbike with 800W Motor; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Quality 18mm Carb Birch Okoumen Plywood, required air pressure, and power were considered as predictor variables simultaneously.

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5GHz Antenna High Gain 16dBi Panel$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 0.2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports, 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%)5GHz 29.5dBi Die Cast Grid Antenna. 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.No Flicker Glare 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with CE RoHS IP68 Reports. Moreover,12volt Input 18watt IP68 Waterproof Underwater Application Swimming Pool LED Lights, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (5GHz 23dBi Dual Polarized Panel Antenna , 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 (Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series), maintenance (Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System), 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,5GHz 27dBi Enclosure WiFi Antenna), and annual cost index of mineral processing equipment.TUV Certificate Gried Tied on Grid 20kw Solar PV System, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with Edison Chip. Maximum MAER of 13.5% and minimum R²of 0.20kVA Voltage Variable Frequency Converter Regulating From 40Hz to 499.9Hz 0-520V-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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