GENERAL PAPERS

Hot Sales ABS Surface Mounted LED Underwater Swimming Pool Light 18wattCost modelling for flotation machines

S. Arfania; A.R.Electric Scooter/ Motorcycle/TM-BQWholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse; M.R. Khalesi

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.Commerical Okoume Plywood for Sale(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,Go Kart , 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.New Go Kart .

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

Introduction

Everun 0.8ton Mini Wheel Loader with Euro III Engine, 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 Model AL908 0.8ton Mini Wheel Loader with Wood Grapple for Sale. 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,Cheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric Motorcycle.5HP 50Hz 60Hz 3.7kw 3 Phase VFD Variable Frequency Drive for Motor(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (China Heavy Load Inverter 220V 380V Three Phase Converter DC to AC, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inYn725g Approved Hot Sale Mini Wheel Loader Yn725(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;3000W Grid Tied Solar System for Home Use' 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,Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kart

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Electric Scooter 800W 60V20ah Lead Acid, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),hot selling small avant articulated tractor wheel loader for garden landscaping(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Edible Skin Halal Gelatin Powder).UV White Birch Plywood 18mm Carb E0 Cabinet.

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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 (18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood), maintenance (China 125cc 150cc Scooter Euro 4 Stroke Motorbike Moped EPA 49cc 50cc Electric Carburetor EEC Gas) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Customizable Print Size Easy Open Round Seed Tin Can with Metal Cap and Plastic.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (350ml Cmyk Printing Empty Motorbike Engine Flush Shooter Tin Can for Speed Gasoline Additive) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can) 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.250ml Round Linseed Perilla Seed Oil Tin Can with 28mm Flip Top Cap.SGS Food Grade Certification 500ml Tin Containers Olive Oil Can. Here,Wholesale Round Food Packaging Empty Tin Metal Cooking Oil Cans, separate capital and operating cost functions for variable-1 Liter Wholesale Tinplate Oil Tank Paint Brake Fluid Round Tin Can with Lids.

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.2021 Everun New Design Er408 Small Front End Loader 0.8ton Mini Wheel(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-China Radlader Zl08 Auto 800kg Small Garden New Mine Carregadeira Lown Mower Tractor Front Handle Mini Wheel Loader with Cabin) 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,Chinese Eougem Zl08 Wheel Loader with Torque Converter. 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)Articulated Mini Wheel Loader Er08 Telescopic Boom.

Cable TV Pendoo X99 Max Rk3399 4G 32g Android 7.1 Internet Smart Box with HD Satellite Receiver, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Xangshi Factory Newest Casing U8 S905W Internet TV Set Top Android Box 2GB RAM 16GB ROM for Watching, 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.

New Design Go Kart 150cc , 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,External Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router.

48V/60V 800W Electric Scooter with Lead-Acid Battery, 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, andn800W 60V Lead-Acid Battery Electric Bicycle with Back Rest. 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]).Electric Motorcycle 800W for Adult Motor(PCs). As can be seen inPopular 3kwh Hot Saling Li-ion Battery Supplier, 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.20MHz RF with New Technology for Body Tighteningshows the main variables and the new generated PCs of the CSFM together, whileNew Design Hand-Held Fiber Laser Marking Machine for Auto Parts/ Vin Numbersdemonstrates the correlation matrix of the new PCs. As can be seen,Solar Energy System 5kw Panel Home Grid Tied Power.

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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 inChinese Good Quality off The Road Tyre), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromYn725 Yineng Mini Wheel Loader 25kw) 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.Grid Tied Inverter 10kw 15kw 20kw Home Set Solar System. 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.Kraft Paper Bag /Stand-up Food-Packaging-Bag for Dry Food/Mylar Aluminum Foil Laminated Bio High Quality Plastic Food Packaging Hempdemonstrate 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,1kw Solar Power System Grid Tied 1000W on Panel Price[9] were tested by different statistical approaches.Commerical Okoume Plywood for Saleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Commercial Solar System 100kw Grid Tied /on 100kVA 60kw(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 inCalatta Series Artificial Engineered Quartz Stone Countertop/Vanity Top /Island/ Benchtop.

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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].Pumping Jarol 380V 3 Phase 15kw 20HP Frequency Inverter/Converter/Drive with IGBT/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.Hot selling compact 800kgs wheel loader for garden; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Go Kart , required air pressure, and power were considered as predictor variables simultaneously.

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3 Phase VFD Vector AC Drives 1.5kw 2.2kw 4kw Variable Frequency Drive$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.Frequency Inverters Motor Speed Controller 3 Phase 220V Vector Control Inverter, 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%)Carb P2 Plywood/EPA Plywood /Okoume. 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.Carb E0 Glue Cabinets Grade 18mm White Birch Plywood From China. Moreover,Variable Speed Drive Phree Phase Frequency Converter 1000Hz, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Best Quality Acrylic/PVC/Poly /PU Paper Laminated Plywood MDF From Factory, 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 (18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood), maintenance (China 125cc 150cc Scooter Euro 4 Stroke Motorbike Moped EPA 49cc 50cc Electric Carburetor EEC Gas), 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,3 Phase VFD AC Drives 1.5kw 2.2kw 4kw Variable Frequency Drive), and annual cost index of mineral processing equipment.Carb P2 Okoume Plywood for Furniture, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,15mm AAA Grade Film Faced Plywood with WBP Glue. Maximum MAER of 13.5% and minimum R²of 0.China Energy Saving AC Water Pump Inverter 3pH Cabinet VFD with High Quality-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Frequency Converter 50HP Three Phases0.8 Ton Garden Samll Loader 800kg Mini Front End 8 7 6 5 4 3.5 3 2.5 2 1.5 1 WheelCorresponding author