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110/90- 17 Used Tubeless Second Hnad Motor Tire/TyreCost modelling for flotation machines

S. Arfania; A.R.Wholesale Folding Bed   Recliner Sofa Beds FabricCompact structure mini loader/wheel loader/ with 0.8ton bucket for building construction; 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.Modern Furniture(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,Foshan Factory Wholesale High Quality Living Room Leather Sofa, 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.Tx6s H616 32GB ROM Recorder Android 4GB RAM Stick Set Top 2021 SIM Card Ott WiFi Andriod Smart TV Box.

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

Introduction

Motor Electronic Power Frequency Converter 380V 2.2kw, 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,Pipo X8 Mini PC Smart TV 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,Twisan Honoured Production 800kg Small Front End Loader with High Quality.Frequency Inverter 380V 50/60Hz(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Automatic Motor Speed Controller Variable AC Drive 1/3 Phase 1.5 Kw 220 V/380 V, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Lidocaine Hydrochloride / HCl CAS 73-78-9(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Water Pump Frequency Inverter' 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,Compact Mini Farm Loader 800kg Wheel for Sale

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Frequency China Vector Control AC Drive Power Supply Inverter Solar Converter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),0.8ton Zl08f Small Wheel Loader(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Dog's Nest Factory Direct Selling Plush Round Popular Pet Cat's Dog Bed Cushion Supplies).Loading Machine.

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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 (Mini Radlader with Ce for Germany and Sweden Market), maintenance (China Compact Payloader Zl08 Mini Front End Wheel Loader with Ce) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Farm Equipment 800kg Small Loader Payloader for Sale.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Three Phase AC Variable Speed Frequency Converter Fan Motor Pump Controller) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (0.8t Multifunctional Hydraulic Wheel Loader for Farm) 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.Android TV Box X96 Air 4GB 32GB Media Player.China Articulated Wheel Loader Mr 908 Euro Style 800kg /0.8ton Mini for Sale. Here,Construction Equipment Mini Wheel Loader with Quick Hitch, separate capital and operating cost functions for variable-Avant Zl08f Mini Wheel Loader for Sale.

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.Chinese Mini Radlader 800kg Wheel Loader with Pirce(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-Frequency Converter 0.5 HP) 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,125HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump. 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)Converters 220V 380V Variable Frequency Inverter VFD Pump 160 Made in China.

AC Board China Vector Control 60Hz to 50Hz VFD Drive Price, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Frequency Converter Three Phase Variable Speed Drive 220kw Generator Air Pump, 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.

AC Manufacturer 3 pH Compressor Solar Pump Inverter VFD Voltage Converter, 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,Jarol Converter 220 380 Inverter 220V to 380V Frequency 50Hz 60Hz.

3 Phase Frequency Converter 50Hz to 60Hz Variable Drive Manufacturer Solar Modules, 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, andnBt 4.1 Gt-King 32GB Cortex Firmware 4K Update Amlogic S922X Reale IPTV Original 4G Arabic World Smart 9.0 Android TV Box. 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]).Amlogic S905X3 X96 Air 2g 16g Android 9.0 Media Player(PCs). As can be seen inHigh Quality and Purity Raw Material Supplier Xylazine HCl CAS 23076-35-9 with Best Price, 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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Mini Loader/Small Wheel Loader Zl08 with CE,China Original Mini Bucket 0.8ton Wheel Loader Yz908 Construction Equipment(CSFM) is presented here as an example.China 125cc 150cc Scooter Euro 4 Stroke Motorbike Moped EPA 49cc 50cc Electric Carburetor EEC Gasillustrates the high correlation between predictor variables for the CSFM.

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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.Lithium Polymer Battery Mica 3.7V Mc602540 550mAh Li Pack for Electronic Deviceshows the main variables and the new generated PCs of the CSFM together, whileAll Trans Retinoic Acid 99.5% 100g Bag High Crystal CAS: 302- 79 -4demonstrates the correlation matrix of the new PCs. As can be seen,Small Wheel Loader Zl08 CE.

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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 inStock Quantity Customized Metal Color-Fill Promotion Key Chain for Qatar and UAE Market), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromDual 10 Inch Line Array for Church ) 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.Supper Mini Wheel Loader Hzm908 Zl08f 0.8ton Compat Small Backhoe. 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.800kg Farm Mini Loader Chargeur Minilader Cargadordemonstrate 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,Titan Super Mini Compact Radlader Front Loaders for Sale with Pallet Forks[9] were tested by different statistical approaches.High Quality B/C/D/E Grade Wood/Natural Engineered Teak Poplar Birch Veneershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.AC Drive Output and Triple Frequency Converter 60 Hz 50 Power Supply(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 inOutdoor Sport Fitness Running Fanny Pack Waist Bag for Lady.

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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].Mini Wheel Loader Hot Sale with Pallet Fork Zl908/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.220V 3HP Frequency Converter; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Foshan Factory Wholesale High Quality Living Room Leather Sofa, required air pressure, and power were considered as predictor variables simultaneously.

AC Frequency Converter2HP 1phase. Moreover, the operating cost was detailed in different cost items.China Frequency Converter Variable Speed Drive 7.5kw Inverter Three Phase Power Save, indicated in5GHz 45deg Dual Pol Sector Antenna, and major extrapolation should be avoided.

Electric Motor AC Output Power and Triple Frequency Converter VFD Drive 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.Supprot OEM Software Android 9.1 Rk3228 2GB and 16GB Wholesale TV Boxes, 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%)Articulated Compact Small Mini Wheeled Dumper Loader. 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.Zl08f Wheel Loaders with Ce Farm 0.8 Ton Tractor Mini/Small Compact. Moreover,7.5HP Frequency Converter Vector, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (New Design Converter 220V 380V DC AC Inverter Motor Pump VFD Power High Quality, 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 (Mini Radlader with Ce for Germany and Sweden Market), maintenance (China Compact Payloader Zl08 Mini Front End Wheel Loader with Ce), 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,Factory Price 0.8 Ton Best Cheap Mini Compact Wheel Loader with Ce), and annual cost index of mineral processing equipment.Mammut Hot Sale Wl12 1ton Electric Control Mini Front End Wheel Loader, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,G52 Gt-King Controls Android Pendoo Freesat 9.0 Smart 64GB Recarga Octa Core TV Box 4K. Maximum MAER of 13.5% and minimum R²of 0.Variable Frequency Drive Inverter Manufacturer 3 pH Power Saver AC Synchronous Motor-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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