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.Mini Loader/Small Wheel Loader Zl08 with CE(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,China Original Mini Bucket 0.8ton Wheel Loader Yz908 Construction Equipment, 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.Small Wheel Loader Zl08 CE.

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

Introduction

Mini Small Hot Sale in Europe Wheel Loader for, 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,Supper Mini Wheel Loader Hzm908 Zl08f 0.8ton Compat Small Backhoe. 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,Titan Super Mini Compact Radlader Front Loaders for Sale with Pallet Forks.AC Drive Output and Triple Frequency Converter 60 Hz 50 Power Supply(Khalesiet al.,2015).

Titan Brand 0.8 Ton Farm Garden Use Mini Smalll Wheel Loader for Sale.Mini Wheel Loader Hot Sale with Pallet Fork Zl908et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Quality 18mm Carb Birch Okoumen Plywood(Smith and Mason, 1997).220V 3HP Frequency Converter(Cylindrical Roller Bearing N19/ 710 Nu19/ Nup19/ Apply for Large and Medium-Sized Electric Motor). One of the preliminary works was undertaken by Prasad (1969)AC Frequency Converter2HP 1phase, Khalesi, and Khosfarman (2014).China Frequency Converter Variable Speed Drive 7.5kw Inverter Three Phase Power Save; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Electric Motor AC Output Power and Triple Frequency Converter VFD Drive Inverter, the role of other effective parameters has simply been overlooked.Supprot OEM Software Android 9.1 Rk3228 2GB and 16GB Wholesale TV Boxes. Furthermore,Articulated Compact Small Mini Wheeled Dumper Loader, 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-Zl08f Wheel Loaders with Ce Farm 0.8 Ton Tractor Mini/Small Compact.7.5HP Frequency Converter Vector(SRA) and multiple regression (MRA) cost functions are presented.New Design Converter 220V 380V DC AC Inverter Motor Pump VFD Power High Quality. 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 (Factory Price 0.8 Ton Best Cheap Mini Compact Wheel Loader with Ce, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSuper Cooling Smart Electric Scooter 500W 800W Motorcycle(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Mammut Hot Sale Wl12 1ton Electric Control Mini Front End Wheel Loader' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,OEM/ODM T95 Allwinner H616 Android 10.0 6K 4GB 32GB Box 4K Remote Control Smart TV, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Beautiful Design T95 RAM 4GB ROM 32GB Allwinner H616 Universal 4K TV Android 10.0 Set Top Box(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Vandalproof IR Dome Camera).Eougem Zl-08 0.8 Ton Chinese Mini Radlader Manufacturer 0.45m3 Bucket 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 (Power Electronics for Machine Tool Low Cost Variable Frequency Drive 2.2kw), maintenance (50Hz 60Hz 220V/380V Vector Control AC Variable Frequency Drive) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Inverter AC Drive.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Power and Triple Output Type Static Electric Motor AC Inverter Solar Speed Control) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Small Compact Front Wheel Loader / Zl08 Farm Garden Mini) 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.DC/AC Drive Inverter Solar Pump Converter 1.5kw Motor Green Energy.Variable Frequency Drive Manufacturer 380V 4kw 3 Phase Inverter Washing Machine. Here,Frequency Converter Variable Drive 50Hz to 60Hz 2HP 2. Kw 1 Phase, separate capital and operating cost functions for variable-800kg Farm Mini Loader Chargeur Minilader Cargador.

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.Titan Brand Mini Small Chargeur De Roues Radlader Gommata Carregador Roda Cargador Ruedaschargeur Tracteur Traktorlader Caricatore Trattore D(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-VFD 0.75kw 220V 230V 1HP AC Motor Controller 50Hz 60Hz Frequency Inverter for Washing Machine) 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,Radlader Zl08 Wheel Loader for Sale Mini Articulated. 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)Customized Bintangor Plywood Face Veneer of Commercial.

Dual Core L55 Freesat IPTV Morocco Installato DVB Set Top Gospel Price DDR4 IP 4K TV Box Android, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (0.18mm Engineered Wood Face Veneer, 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.

4K J45 128GB Stick Firmware Download User Manual for Cable Junction Android TV Box, 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,Dyed Skateboard Veneer.

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whereC_eis the estimated cost,C_athe actual cost, andnAmerican Walnut Single Crown Cut Veneer Recon Engineered for Door Furniture Plywood. 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]).Power Supply 3 pH 4kw Converter 60Hz 50Hz Water Pump Frequency Inverter(PCs). As can be seen inJacuzzi Massage Endless Swimming Pool Swim SPA, 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.Factory Price Wholesale Vespa Electric Scooter Motorcycle Adultshows the main variables and the new generated PCs of the CSFM together, whileWaterproof IP68 PC Resin Filled Warm/Cool White Wall Mounted LED Swimming Pool Light with Two Years Warrantydemonstrates the correlation matrix of the new PCs. As can be seen,Natural Oak/Walnut/Cherry/Maple Veneer Commercial Plywood/Fancy Plywood for Furniture.

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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 inElectric Winch High Speed Quality 5 Ton), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from5.8GHz 30dBi Single-Pol Die Cast Grid Antenna) 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.Natural Wood Sapele Veneer Plywood for Furniture Grade. 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.China Manufacturer Decorative Engineered Wood Veneerdemonstrate 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,20mm Plywood or Timber[9] were tested by different statistical approaches.4G 32g H96 Max 3566 World International Best Custom Internet Digital TV Converter 4K Smart Android Boxshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Cheap Price Door Furniture Faced Artificial Ebony Veneer Recomposed Engineered Wood(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 inYishan 180HP high efficiency bulldozer T180 with Komatsu technology.

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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].10'x6' Rotary Cut Okoume Veneer for Plywood/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.Engineer Veneer Ebony; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China Original Mini Bucket 0.8ton Wheel Loader Yz908 Construction Equipment, required air pressure, and power were considered as predictor variables simultaneously.

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0.8t Snow Plow Loader Zl08 Mini Wheel$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.Construction Zl08f Mini Hydraulic Compact Front End Loader for Sale, 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%)Zl08f Mini/Small Farm Garden Compact Wheel Loader with Lawn Mower. 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.Hzm908 Er908 Europe Loader Mini Ce EPA Sale with Fork. Moreover,Zl08f Construction Machine Farm Tractors Mini Compact Loaders, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (4X8 Size Rotary Cut Okoume Veneer for Plywood Face and Back, 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 (Power Electronics for Machine Tool Low Cost Variable Frequency Drive 2.2kw), maintenance (50Hz 60Hz 220V/380V Vector Control AC Variable Frequency Drive), 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,0.15mm Okoume Wood Face Veneer Rotary Cutting for Sell), and annual cost index of mineral processing equipment.Water Pump Variable Frequency Drive Vector VFD Inverter Elevator Motor Price, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Performance Vector Control 1pH 220V VFD Variable Frequency Inverter Speed Drive for AC Electric Motor. Maximum MAER of 13.5% and minimum R²of 0.Sapele Veneer Plywood Sheet for Wood Furniture and Decoration-feasibility and even feasibility study level of projects.

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Factory Direct HK1 Cool Set Android 9.0 4GB RAM 16GB ROM IPTV 64GB Firmware Smart TV Box.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [No Flicker Glare 12V 18W Surface Mounted LED Underwater Swimming Pool Light with CE RoHS IP68 Reports]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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