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.Cheaper Long Range off Road Best Selling Hot China Xindazhou Products Motorcycle Electric Adult(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,2021 Fashion Electric Mtorcycle 2000W Motor China, 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 Dumper Wolf Wl80 Loader with CE.

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

Introduction

Engine Oil Cans 4 Liter Motor Lubricating Tin Can, 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,Yn725 Gyineng Mini Wheel Loader. 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,Solar Pump Frequency Inverter MPPT Fuction 0.75kw.Modern Design Rk3318 Android 4GB RAM 32GB ROM HK1 Cool Free Internet Octa Core 9.0 Set Top TV Box(Khalesiet al.,2015).

Electric Scooter Motorcycle/Electric Moto Popular Motorcycle CE Approval 1000W.AC to Drive 380V Frequency Inverter 4kwet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Factory Price Power Battery Motor E Scooter 60V 20ah 2000W Electric Motorcycle(Smith and Mason, 1997).Europe Hot Sell Electric Motorcycle Long Distance The Battery Removable DIY Sticker Cartoon(Q1 Dual 10 " Line Array System). One of the preliminary works was undertaken by Prasad (1969)2021 New Cheap Hot Sale Adults Small Electric 800W Motorcycle with Pedals, Khalesi, and Khosfarman (2014).China Hot Sale Single Phase Variable Frequency Inverter 1.5kw 220V; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Small Fquequency Inverter/Converter for Mini Motor, the role of other effective parameters has simply been overlooked.1.5kw 1HP AC Frequency Inverter. Furthermore,500- 800W Cheap Adult Electric Scooter Motorcycle Sport Style for Sale in Stock, 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-Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin.Jarol Frequency Inverter with High Quality (SRA) and multiple regression (MRA) cost functions are presented.Linyi 9mm/12mm/15mm/18mm Pine/Bintangor/Okoume Film Faced Plywood. 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 (China Hot Sale Frequency Converter/Inverter 380V 50/60Hz, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPower Column Speaker PA System(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Residential Grid Tied 6kw Solar Power System for Home' 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,2021 60V 20ah EEC Motorcycle Electric Moped Scooter 500/ 800W Motorbike

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Chinese Industrial Titan Small 0.8 Ton Articulated Earth Mover Euro Auto Mini Farm Truck Wheel Tractor Front End Loader for Sale, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Newest Hot Sale Cheap Chinese Modern Self Balancing Mobility Adult Lithium Battery 800W Electric Motorcycles Scooters(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Prime Power Three Phase Silent Diesel Generator Price for Kenya Fuel Consumption Per Hour).Three Phase Frequency Inverter Made in China Hot Sale.

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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 (0.8ton mini wheel loader with small bucket for multifunctional use), maintenance (Wuxi Electric Scooters New Cheap Model 60V 20ah 800W Motorcycle for Adult) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,2 Wheel Electric Motorcycle with Lead Battery.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Solar Panel System 20kw Grid Tied Power for Home) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (5kw Solar-Diesel Generation Hybrid Grid- Tied Power System) 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.Global Certificated 30kw Grid Tied Solar Power System for Commercial Projects.2852 Alicosolar Solar Energy System 10kw 5kw Power Home 15kw Grid Tied. Here,Cheap Commercial Plywood for Construction Decoration and Furniture Use, separate capital and operating cost functions for variable-Kodi TV Box Fully Loaded Chrome Android 9.1 OS T95 Max H6 4G 32g Internet Satellite.

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.Solar Panel System 20kw Grid Tied Home Power 20 Kw Energy(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-20kw Grid Tied Solar System) 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,Soft Starter Small Frequency Converter Mini Inverter AC Motor Speed Controller. 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)Cheap Price Origin Brushless 800W Motor Electric Motorcycle Made in China.

Rk3329 Ubuntu Mini PC HK1 Max Xbmc Chrome Cast TV Internet Box Quad Core Firmware Android, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (220VDC to 220VAC Variable Frequency Inverter, 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.

Solar Pump Inverter 1.5kw AC Drive Frequency Welding Machine, 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,Electrical VFD Frequency Inverter Three Phase 220V 380V 7.5/11kw for Solar Pump.

Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, 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, andn380V 400Hz 3p AC Drive Hot 15kw Frequency Converter. 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]).Single Phase Input and Output 220V Able 640 Static Frequency Converter 400Hz(PCs). As can be seen inEnglish Firmware Huawei Hg8346m Optical Network Terminal Gpon ONU Ont 4port Epon 4fe, 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.Dual 8inch Professional Sound System for Sports Venus Stadium Fitness Clubshows the main variables and the new generated PCs of the CSFM together, whilePA Horn Loaded Speaker Professional Loudspeakerdemonstrates the correlation matrix of the new PCs. As can be seen,7.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump.

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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 inFrozen Cauliflower), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from220V 80A 50Hz Portable Lithium Battery Generator Charger with 3.8kwh for Appliances Rated Power Under 1500W Outdoor & Indoor Use) 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.Qingzhou 0.8ton Shovel Loader Small Front with Bucket for Sale. 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.Polyamide Fabric PAdemonstrate 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,Eougem 0.8ton Articulated Payloader Zl08 with Changchai Engine[9] were tested by different statistical approaches.Wolf Mini Wheel Loader Wl950 Farmshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.AL908 0.8ton Wheel Loader Machinery for Sale(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 inUPVC Windows and Doors Sliding or Casement as Request Large Manufacture.

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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].800kg China Small Front High Quality Wheel Loader for Sale in Europe/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.Melamine Glue WBP Commerical Plywood; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,2021 Fashion Electric Mtorcycle 2000W Motor China, required air pressure, and power were considered as predictor variables simultaneously.

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18mm Brown Film Faced Finger Jointed Plywood for Concrete Formwork$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 0.18mm Embossed Melamine Faced Commercial Plywood for Furniture Making, 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%)Filmfaced Plywood with High Quality and Cheap Price. 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.9mm E1 Glue Bintangor Plywood Board. Moreover,E0 12mm Good Quality Melamine Laminated Plywood for Furniture Produce/Baby Room, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (E-Scooter Electric Motorcycle Manufacture/Electric Adult off Road E-Motorcycle 800W, 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 (0.8ton mini wheel loader with small bucket for multifunctional use), maintenance (Wuxi Electric Scooters New Cheap Model 60V 20ah 800W Motorcycle for Adult), 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,AC Drive), and annual cost index of mineral processing equipment.Hot Sale 60V 800W Brushless Motor Two Wheel Electric Motorcycle, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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