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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.China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 250kw(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,Yangtze Solar Power Grid Tied System Home 5kw 5K, 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.Hot Sale and Competitive Price Electric Motorcycle Scooter for Daily.

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

Introduction

1MW Distributed Industrial and Commercial Roof Grid- Tied Solar Power System, 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,AC Fan Frequency Inverter VFD Vector Control 3pH 30kw. 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,3 Liter High Quality Customized Square Printed Tin Cans for Oil/Paint.Metal Tin with Steel Handle for Paint(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDual 10 " 600W Line Array PA Professional Speaker (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Grid Tied 5kw Residencial Solar Energy System Home Power 5000W Panel' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Yn725g 18.5kw Cabin Yineng Mini Wheel Loader(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (1080P HD Network IR Infrared Surveillance Metal Dome IP Camera).Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader.

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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 (Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin), maintenance (5L Rectangle Metal Aluminium Chemical Paint Oil Easy Open Tin Can) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Yn725 Gyineng Mini Wheel Loader 18.5kw Non -Cabin.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Fast Delivery Home 5kw Solar Power Grid Tied Energy System Cheap Price) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (1389 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home 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.Full HD Media Player Minix Neo N42c-4 N4200 4G 32g Internet Games Online Play Racing Windows 10 Smart Set Top Box Support Google Apk Install.6000W Single Phase Inverter Grid Tied Home Solar System. Here,Complete Set 15kw Grid Tied Solar Power System, separate capital and operating cost functions for variable-China Cheap Colour Optional Electric Motorcycle for Adults.

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.Good Quality 2-Wheel Electric Motorcycle 500-1000W Scooter in Stock(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-Yn725 Yineng Mini Wheel Loader 18.5kw No 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,China Electric Mobility Scooter Motorcycle with Lights/Electric Bicycle Moped Fast Delivery. 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 Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W.

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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.

Cheaper Long Range off Road Best Selling Hot China Xindazhou Products Motorcycle Electric Adult, 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,2021 Fashion Electric Mtorcycle 2000W Motor China.

Mini Dumper Wolf Wl80 Loader with CE, 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, andnEngine Oil Cans 4 Liter Motor Lubricating Tin Can. 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]).Yn725 Gyineng Mini Wheel Loader(PCs). As can be seen inT250-04 452055-5004s Turbocharger for Gemini III Engine, 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.Plastic Products Colorful Pellets Resin Raw Material Light Green Color Antistatic Masterbatch Customizedshows the main variables and the new generated PCs of the CSFM together, whileSolar Energy System 5kw Panel Home Grid Tied Power 6kw 8kw 10kwdemonstrates the correlation matrix of the new PCs. As can be seen,AC to Drive 380V Frequency Inverter 4kw.

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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 in5 Years Warranty Outdoor Solar LED Garden Light), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from20watt Mopa Laser Marking Machine for Anodized Aluminum Black) 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 0.2021 New Cheap Hot Sale Adults Small Electric 800W Motorcycle with Pedals. 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.Custom Kraft Paper Flexible Food Packaging Flat Bottom Bag-100grdemonstrate 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 Hot Sale Single Phase Variable Frequency Inverter 1.5kw 220V[9] were tested by different statistical approaches.Three Phase Vector Frequence Converter with High Performanceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Small Fquequency Inverter/Converter for Mini Motor(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 inGlitter Gel. UV Esmlate De Nail Pilish 2906.

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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].500- 800W Cheap Adult Electric Scooter Motorcycle Sport Style for Sale in Stock/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.Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Yangtze Solar Power Grid Tied System Home 5kw 5K, required air pressure, and power were considered as predictor variables simultaneously.

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China Hot Sale Frequency Converter/Inverter 380V 50/60Hz$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.Residential Grid Tied 6kw Solar Power System for Home, 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%)Best Factory China Environmentally Friendly 800W CE Certification Electric Motorcycle for Adult. 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.Good Quality Factory Directly Electric Motorcycle 800W 1000W 60V for Adults. Moreover,on Grid Solar Panel System 30kw Tied Home Power, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Tractor loader/ mini loader with four wheels for loading, 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 (Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin), maintenance (5L Rectangle Metal Aluminium Chemical Paint Oil Easy Open Tin Can), 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,2021 60V 20ah EEC Motorcycle Electric Moped Scooter 500/ 800W Motorbike), and annual cost index of mineral processing equipment.Chinese Industrial Titan Small 0.8 Ton Articulated Earth Mover Euro Auto Mini Farm Truck Wheel Tractor Front End Loader for Sale, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Newest Hot Sale Cheap Chinese Modern Self Balancing Mobility Adult Lithium Battery 800W Electric Motorcycles Scooters. Maximum MAER of 13.5% and minimum R²of 0.Three Phase Frequency Inverter Made in China Hot Sale-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.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.Soft Starter Small Frequency Converter Mini Inverter AC Motor Speed Controller, Montreal. 319 pp.         [High Quality 18watt RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Two Years Warranty]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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