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.HK1 Smart TV Box Amlogic S905W Android 7.1 Quad Core 2GB 16GB(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,Innopack 5L Paint Engine Oil Tin Can with Plastic Handle, 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.Innopack Food Grade Metal Tin Can for Edible Cooking Oil in Low Price.

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

Introduction

Cheapest Price Mxq PRO Rk3229 4K Android TV Box 1GB 8GB Smart Set Top Download User Manual Firmware Update Wholesale Model, 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,Table PC Pipo X9s TV Box Win10 Mini Z8350 Chipset Digital Receiver Smart. 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,Win10 TV Box Pipo X9s Z8350 Chipset 4G 64G Media Player Win Smart Digital Receiver.Variable Speed Inverter China Frequency Converter AC(Khalesiet al.,2015).

Natural Material Veneer Hand Made Woven for Wall Decoration.458 Alicosolar High Efficiency 10kw on Grid Solar System Kit Home with CE/TUV/ISO for Useet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Plastic PVC/CPVC Electricity Conduit Tube/ Water Sewage Pressure Pipe/Gas Hose/ Profile/Sheet Extrusion &Extruding Production Line Price(Smith and Mason, 1997).5kw Single Phase Home Grid Tied Solar Power System(Passive RMS 700 Watts Dual 10 Inch Neodymium Line Array Speaker for Outdoor Show). One of the preliminary works was undertaken by Prasad (1969)Hot Sale 15kw Grid Tied Solar Photovoltaic Power System, Khalesi, and Khosfarman (2014).5kw Inverter Grid Tied Solar Power System for Home; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,975 Solar 30kw 40kw on Grid Tie Power System for Factory/House Roof, the role of other effective parameters has simply been overlooked.Rosen 55kw Grid Tied on Solar System to Global Market. Furthermore,Cheap Factory Price China Supplier 1000W Adult Electric Scooters/Electric Motorcycle for Sale, 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-Hot Cheap Electric Scooter 60V800W20ah for Adult From China.Luxury 350W 2 Wheel Electric Bike Scooter/Electric Moped with Pedals Motorcycle Scooter(SRA) and multiple regression (MRA) cost functions are presented.Cheap Cute Electric Scooter with Foot Pedal 60V800W20ah From China. 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 (China Qingzhou Titan Zl08f 0.8ton Mini Small Garden Tractor Front End Wheel Loader, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in30Hz J45 Worldwide Download User Manual for Android Case DDR4 4GB/128GB Octa-Core 2021 Control 4G Internet Set Top TV Box(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Three Phase 220V Frequency Converter with Vector Control' 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,Okoume Veneer

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Luneng Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Chinese Factory Tin Can with Brush for Glue and Sealants Adgesives(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Best Price Wood Door Making Machine CNC Router).Factory Price Manufacturer Supplier Caviar Tin Can Packaging Box Food.

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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 (Customized Metal Tea Canister Food Packaging Box Round Can Tin), maintenance (Square Tin with Airtight Lever Lid for Tea) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hot Sale Factory Direct Easy Open Tin Can for Food Cannery.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (968 Solar 30kw 40kw on Grid Tie Power System for Factory Roof) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (0.15mm Rosewood Veneer) 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.Interior Decorative Woven Veneer Customized Style.4WD Wheel Loader Manufacture Small Radlader 1.0 Ton Mini780. Here,Farm Machinery Zl08f Mini Wheel Loader with 4 in 1 Bucket, separate capital and operating cost functions for variable-Yn725 Yineng Mini Wheel Loader 18.5kw Cabin.

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 China Micro New Design Small Mini Front Brand Wheel Loader with Standrad Bucket(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 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,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin. 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)0.6mm----2mm AAA Grade White Poplar Wood Veneer for Plywood Usage.

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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.

Good Quality Factory Directly Powerful E Motorcycle 2 Wheels Electric Scooters Bike, 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,Quarter Cut Ebano Makassar Chapa De Madera PARA Cocina Puerta.

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whereC_eis the estimated cost,C_athe actual cost, andnFarm Tractors Front End Loader Mini Small Ce Zl08 Wheel with Quick Hitch. 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]).Cute City Electric Scooter 600V800W14ah Lithium Battery for Adults(PCs). As can be seen in1L /1000ml Extra Virgin Olive Oil Metal Can, 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.10kw Complete Set Solar Power Systems on-Grid for Home/ Industrial/Commercial Roofshows the main variables and the new generated PCs of the CSFM together, whileCheap Price Zl08 0.8ton China Mini Articulated Hydraulic Front End Tractor Loadersdemonstrates the correlation matrix of the new PCs. As can be seen,Chinese Famous Producer Everun Supply Er408 Articulated Wheel Loader with Bucket.

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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 inWedding Jewellery Sterling Silver or Brass Fashion Jewelry Earrings for Women), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromElectric Motorcycle ) 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.Factory-Quater Cut Okoume Veneer /Mahogany in 0.50mm. 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.PA /CPP Rotort Pouchdemonstrate 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].Empty Lubricant Oil Tin Can Packaging for Motor/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.974 Solar 30kw 40kw 50kw on Grid Tie Power System for House/Factory Roof; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Innopack 5L Paint Engine Oil Tin Can with Plastic Handle, required air pressure, and power were considered as predictor variables simultaneously.

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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.Best Price Food Tin Metal Box Clip Lid Candy Can. Moreover,3L/5 Liter Metal Can Packing Empty Cans for Ink and Coating From China Manufacturer, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality Mxq PRO 4K Rk3229 1GB 8GB Android7.1 Quad Core Android TV Box, 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 (Customized Metal Tea Canister Food Packaging Box Round Can Tin), maintenance (Square Tin with Airtight Lever Lid for Tea), 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,High Efficicency Roof Mounting Grid Tied Home Solar Energy System), and annual cost index of mineral processing equipment.488 Alicosolar High Quality 20kw on Grid Solar System 20000W Kit Mono Soalr Panel with CE/TUV/ISO for Home Use, and over- extrapolation could result in misguiding estimates.

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Lashgari, A.Al-Gw6 China Best Adult Electric Motorcycle Scooter for Sale, A.R. 2013.2 Wheel High Speed Lithium Battery E Motorcycle 500W Electric Scooter for Adults,800kg Wolf Zl08 Wheel Hoflader Loader Mini Bagger with Attachments,vol. 23. pp. 441-446.         [Soft Breathable Dispossable Sleepy Baby Diaper Factory in China]

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Frequency Converter 60Hz 50Hz 150HP.Frequency Converter 60Hz 50Hz 125HP.Square Engine Oil Tin Can with Screw Cap Manufacturer Lid, Montreal. 319 pp.         [Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate]

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USBM. 1987.3HP Three Phase Frequency Converter,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [2014 Brand New Empire White Lace V-Neck Organza Wedding Dresses Bridal Gowns]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

12" Die Cast Aluminum PA Speaker FrameFrequency Converter 60Hz 50Hz 75HPCorresponding author