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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.Bd600 AC Frequency Inverter/Converter/220 V to 380 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,1L Beer Can, 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.High Quality Electric Scooter Factory.

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

Introduction

Cute Electric Scooter Motorcycle with Pedals 60V800W14ah Lithium Battery for Adults, 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,1L Panit Can. 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,1L and 5L Can for Antifreezing Liquid.2021 Fashionable High Quality with Lithium Battery Electric Scooters EEC Vespa Citycoco Newest Model Motorcycle(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (AAA Grade 0.9mm Poplar Core/Veneer for Plywood/Furniture, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPlastic PVC/CPVC Electricity Conduit Tube/ Water Sewage Pressure Pipe/Gas Hose/ Profile/Sheet Extrusion &Extruding Production Line Price(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Radiate Pine Face Veneer' 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,1L Tin Can for Camellia Oil

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Mxq 4K PRO Allwinner H3 Quad 7.1 1GB RAM 8GB ROM H. 265 3D Android Media TV Box(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wi-Fi Enabled Standard Energy Consumption Smart WiFi Plug Socket).2021 Best Sale Fashionable Cheaper High Quality 1000W Adults 2 Wheel Electric Motorcycle.

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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 (Set Top Box T95q S905X2 4G 32g Android 9.0 HD TV Kodi Quad Core), maintenance (Hot Popular Fast Shipping H. 265 Standars Czech Republic Channels Internet TV Box) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Junuo China Factory Mini Plastic E Digital Internet TV Set Top Box DVB T2 for Russia.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (5 Litre Extra Olive Oil Tin Can ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (DC/AC Frequency Inverter Solar Pump Power 400-600V Input 2.2kw) 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.Frequency Converterlow Industrial Power Inverter.2370 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use. Here,China Electric Moped Motorcycle Sale for Adults Mobility E Scooter with Battery, separate capital and operating cost functions for variable-Three Phase 380V/ 0.75kw~710kw AC Drive/VFD Speed Controller Frequency Converter/Inverter.

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.DC/AC Frequency Inverter Solar Pump Power 400-600V Input 4kw(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-Low Price B/C/D/E Grade Wood/Natural Birch Veneer) 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,Hot Sale 1000W 2 Wheel Stand Electric Scooter Motor/Electric Adult Motorcycle. 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)Solar Pump Inverter Price Quality AC Drive Frequency Converter.

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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.

Al-Gw6 Fast Electric Motorcycle Speed 60km/H Kits, 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,Titan Chargeuses Cheap Small Log China Mini Digger Loader with European Quick Hitch.

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whereC_eis the estimated cost,C_athe actual cost, andnCheap Chinese Moped Scooter with Lithium Battery Rechargeable Electric Motos Motorcycle. 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]).2021 Wuxi Best Selling New Type Racing Mobility Adults 2 Wheels Electric Motorcycles E Motos CKD Scooters(PCs). As can be seen inPA Woofer Speaker T- 10 12 15, 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.DJ Stage PRO Audio Indoor Club 15" Line Array Loudspeakershows the main variables and the new generated PCs of the CSFM together, whileBest Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Pricedemonstrates the correlation matrix of the new PCs. As can be seen,Zl08 0.8 Ton Garden Tractor Pay Loader 800kg Mini.

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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 inPanel Mounted Industrial Socket 380-415V), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from4-Chloro-4'-Methylbenzophenone High Quality Products CAS 5395- 79 -9) 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.Wolf Shovel Loader E5 for Agriculture Work. 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.Certificated Vector Control 220V/380V Three Phase VFD Power Variable Frequency Inverter Speed Drive for AC Electric Motordemonstrate results for the machines modelled in this research.

Multiple regression results

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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].Agricultural Machine Small Wheel Loader Mini780 with CE Certificate/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

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Factory Supply OEM Support Mxq PRO Rockchip Rk3229 Android 7.1 TV Box$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.Natural Okoume Venner 0.90mmx6X9FT, 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%)All Sizes Good White Recon Veneer. 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.Dyed Natural Wood Veneer Oak Crown Cut for Hotel Decoration Shop Wall Kitchen Cabinet. Moreover,15mm Pine Wood Core Block Board for Construction, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (The New Natural Mahogany Okoume Veneer, 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 (Set Top Box T95q S905X2 4G 32g Android 9.0 HD TV Kodi Quad Core), maintenance (Hot Popular Fast Shipping H. 265 Standars Czech Republic Channels Internet TV Box), 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,Veneer Paper Tape Reeling and Gummed Repair for Joining Repairing Core Face Door Furniture), and annual cost index of mineral processing equipment.982 High Efficiency up to 99% on Grid Solar System 50kw Plants for Large Scale Commercial, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,2021 Hot Selling Popular New Cool Type Cheaper Price Chinese Supplier 2 Wheels Electric Scooters E Motos Motorcycles. Maximum MAER of 13.5% and minimum R²of 0.Windows Mini PC Pipo X10 PRO Z8350 Chipset Smart TV Box Android 5.1 4G RAM 64G ROM-feasibility and even feasibility study level of projects.

References

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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