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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.Vectron Frequency Inverter(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,Zl08f Mini Small Farm Compact Tractor Wheel Loader with Standard Bucket, 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.Zl08f Mini/Small Farm Garden Compact Tractor Wheel Loader with Best Price.

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

Introduction

OEM/ODM T95 Allwinner H616 Android 10.0 6K 4GB 32GB Box 4K Remote Control Smart TV, 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,Beautiful Design T95 RAM 4GB ROM 32GB Allwinner H616 Universal 4K TV Android 10.0 Set Top Box. 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,Eougem Zl-08 0.8 Ton Chinese Mini Radlader Manufacturer 0.45m3 Bucket Loader.Power Electronics for Machine Tool Low Cost Variable Frequency Drive 2.2kw(Khalesiet al.,2015).

50Hz 60Hz 220V/380V Vector Control AC Variable Frequency Drive.Inverter AC Driveet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Oxygen Absorbers Food Packaging Vacuum Packed Bag for Cookies(Smith and Mason, 1997).Power and Triple Output Type Static Electric Motor AC Inverter Solar Speed Control(0-5V 0-10V Raw Petro High Temperature Sapphire Pressure Transducer). One of the preliminary works was undertaken by Prasad (1969)Small Compact Front Wheel Loader / Zl08 Farm Garden Mini, Khalesi, and Khosfarman (2014).DC/AC Drive Inverter Solar Pump Converter 1.5kw Motor Green Energy; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Variable Frequency Drive Manufacturer 380V 4kw 3 Phase Inverter Washing Machine, the role of other effective parameters has simply been overlooked.Frequency Converter Variable Drive 50Hz to 60Hz 2HP 2. Kw 1 Phase. Furthermore,800kg Farm Mini Loader Chargeur Minilader Cargador, 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-Titan Brand Mini Small Chargeur De Roues Radlader Gommata Carregador Roda Cargador Ruedaschargeur Tracteur Traktorlader Caricatore Trattore D.VFD 0.75kw 220V 230V 1HP AC Motor Controller 50Hz 60Hz Frequency Inverter for Washing Machine(SRA) and multiple regression (MRA) cost functions are presented.Radlader Zl08 Wheel Loader for Sale Mini Articulated. 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 (Customized Bintangor Plywood Face Veneer of Commercial, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina Manufacturer Decorative Engineered Wood Veneer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Dual Core L55 Freesat IPTV Morocco Installato DVB Set Top Gospel Price DDR4 IP 4K TV Box Android' 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,American Walnut Single Crown Cut Veneer Recon Engineered for Door Furniture Plywood

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Power Supply 3 pH 4kw Converter 60Hz 50Hz Water Pump Frequency Inverter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Comaccord D and E Grade 0.26mm Birch/Oak/Ash Face Veneer for Vietnam Furniture Plywood(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (IP65 All in One Solar Garden Lighting for Outdoor).Rotary-Cut Okoume Wood Veneer 0.25mm A Grade for India.

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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 Contruction Machine Mini Small Wheel Loader with Bucket), maintenance (Natural Oak/Walnut/Cherry/Maple Veneer Commercial Plywood/Fancy Plywood for Furniture) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Top Quality Cheap Price 0.3mm Birch Face Veneer for Furniture Plywood.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Natural Wood Sapele Veneer Plywood for Furniture Grade) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (20mm Plywood or Timber) 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.Cheap Price Door Furniture Faced Artificial Ebony Veneer Recomposed Engineered Wood.Factory-White Engineer Veneer Big Size 1300X3300X0.30mm 0.40mm 0.50mm. Here,10'x6' Rotary Cut Okoume Veneer for Plywood, separate capital and operating cost functions for variable-Engineer Veneer Ebony.

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.800kg China Articulated Mini Small Compact Front End Wheel Loaders(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-Hzm908 Jn 908 31.5loader Mini Wheel Loader for Sale Best Price Top Quality) 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,0.8t Snow Plow Loader Zl08 Mini Wheel. 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)Construction Zl08f Mini Hydraulic Compact Front End Loader for Sale.

Zl08f Mini/Small Farm Garden Compact Wheel Loader with Lawn Mower, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Hzm908 Er908 Europe Loader Mini Ce EPA Sale with Fork, 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.

Zl08f Construction Machine Farm Tractors Mini Compact Loaders, 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,4X8 Size Rotary Cut Okoume Veneer for Plywood Face and Back.

0.15mm Okoume Wood Face Veneer Rotary Cutting for Sell, 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, andnWater Pump Variable Frequency Drive Vector VFD Inverter Elevator Motor Price. 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]).High Performance Vector Control 1pH 220V VFD Variable Frequency Inverter Speed Drive for AC Electric Motor(PCs). As can be seen inMotorcycle for 1405mm of Wheel Base, 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.Supper Mini Wheel Loader Hzm908 Zl08f 0.8ton Compat Small Backhoeshows the main variables and the new generated PCs of the CSFM together, whileHardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certificationdemonstrates the correlation matrix of the new PCs. As can be seen,Veneer Engineer Poplar Cross Grain 0.50mm.

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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 in0.75ton Chain Lever Block with Plastic Handle), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromEndless Swimming Pool) 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.Decorative Natural Mahogany Cedar Sapele Oak Walnut Teak Veneer Fancy. 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.3 pH 11kw Chinese AC Control Frequence Inverter Variable Speed Drive Power Converterdemonstrate 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,Factory Price 3 Phase 50Hz to 60Hz AC Converter Solar Pump Inverter[9] were tested by different statistical approaches.Grid Tied 100kw 200kw 300kw Solar Systemshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Frequency Converter(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 inBucket Tooth Holder No. 60116435K of Sany Excavators Spare Parts.

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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].Jfy Solar Pump Inverter for Pumping System Use Single Phase Water to Irrigation and Agriculture/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.Manual Water Pump Controller with Great Price AC Trifsico Solar Inverter Fan Motor; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Zl08f Mini Small Farm Compact Tractor Wheel Loader with Standard Bucket, required air pressure, and power were considered as predictor variables simultaneously.

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220V 7.5kw Variable Frequency Drive VFD 3phase AC Inverter$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.Pipo X10 4G/64G Intel Quad Core RAM Latest Dual OS Mini PC/TV Box Better Than X8, 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 Direct HK1 Cool Set Android 9.0 4GB RAM 16GB ROM IPTV 64GB Firmware Smart TV Box. 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.Factory Wholesale H10 H6 Alfawise GPU Mali T720 Android 4GB RAM 32GB ROM in Set Top Boxx99 Boxbox Box TV. Moreover,Frequency Power Supply China Variable Speed Drive Voltage Converter AC Motor, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Titan 4 Wheel Driving 0.8ton Mini Micro Compact Loaders Garden and Farm Using, 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 Contruction Machine Mini Small Wheel Loader with Bucket), maintenance (Natural Oak/Walnut/Cherry/Maple Veneer Commercial Plywood/Fancy Plywood for Furniture), 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,Radlader Zl08 Mini Wheel Loader for Agriculture Work), and annual cost index of mineral processing equipment.Hzm908 Jn908 31.5 Tyre Loader Best Price Hot Sale, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Pendoo X10 Max Amlogic S905X3 Android TV Player World IPTV Video Box Support IR /2.4GHz Wireless Mobile Remote Control. Maximum MAER of 13.5% and minimum R²of 0.Android TV Box 7.1 Smart Full HD 1080P Video Motherboard for Kodi 17.6-feasibility and even feasibility study level of projects.

References

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Hzm908 Er908 Europe Loader Mini Ce EPA Sale with Fork, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Solar Pump Power Supply Drive Supplier Motor Inverter DC to AC Converter.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [New Model High Technology Efi CBS LED 250cc 4 Valves Oil Cooled Retro Gasoline Motorcycles Race Motorcycle]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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