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Auto Feeding Inner Mounted Pipe Tube Beveling EngineCost modelling for flotation machines

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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.3 Liter Tin Packing Chemical Can with Spout(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,Food Grade Round Tin Can for Welded Milk Powder Packaging, 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 0.1gallon Round Metallic Tin Can with Metal Handle for Paint.

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

Introduction

Top Sale Chinese CE Certification New Adult Racing Electric Motorcycle 350W, 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,Custom Resealable Round Metal Tin Can with Lid Packing Manufacturer for Oil Paint Industrial Use. 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,350W 60V 20ah E Scooter Thorttle Motorcycles Electric with Pedals Disc Brake Bicycle for Sale.Fluid Storage Containers Lubricants for Use(Khalesiet al.,2015).

0.8t 800kg Small Loader.Factory Direct High Quality Glue Round Tin Cans with Brushet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for D&B Style Dual 10 Inch Compact Line Array (Smith and Mason, 1997).350-1500W 48-72V Smart Cheap Motorcycle for Adults Heavy Duty Electric(Electric Motorcycle ). One of the preliminary works was undertaken by Prasad (1969)Cute Street Electric Scooter with LED Light 60V800W20ah, Khalesi, and Khosfarman (2014).Lady's Smart Electric Scooter Motorcycle 60V800W20ah; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Reconstituted Composite Woven Veneer Braided, the role of other effective parameters has simply been overlooked.Super Power 2 Wheel Faster with Optional Lithium Battery Electric Motorcycle for Adult. Furthermore,Roof Mounting 20kw Grid Tied Solar Power System Home, 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-Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin.Wolf 0.8t Mini Loader with Grass Fork(SRA) and multiple regression (MRA) cost functions are presented.Everun Brand 0.8ton Compact Wheel Loader with 4in1 Bucket. 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 (Zl08f Wheel Loader with Rops Cab, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Underwater Swimming Pool Light Decoration LED Lamp(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;2HP 1 Phase Frequency Converter' 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,3HP Frequency Converter Vector Three Phase

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,15HP Three Phase Frequency Converter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Power Smart Electric Scooter with LED Light 60V800W20ah(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Nail Art Decoration Brand Logo Polish Stickers Transfer Foil 10 Rolls/Box).3HP Three Phase Frequency Converter.

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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 (1HP Frequency Converter Vector Three Phase), maintenance (15HP Frequency Converter Vector Three Phase) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,2HP Frequency Converter Vector Single Phase.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Solar Energy System 5kw Panel Home Grid Tied Power 6kw 8kw 10kw) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Home Use 6kw Grid Tied Solar Power System with High Performance) 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.Hot Sale 10kw 10000W off Grid Solar Power System Home Use.4kw 3phase Frequency Converter 50Hz to 60Hz. Here,1.5kw 3phase Frequency Converter 50Hz to 60Hz, separate capital and operating cost functions for variable-Automaticall Switch 5kw 6kw Hybrid Solar System with Lithium Battery Backup and Tier 1 Panels.

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.Round Tin Can for Food Packaging Empty Tinplate(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-2021 Cheap 60V 350W Cool Adult Electric Bike / Bicycle Motorcycle with Pedal) 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,Pencil Cedar Veneer Medium Denstiy Fiberboards for Stairs. 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)Technical Wood Veneer MDF Boards for Cupboard.

High Quality Small Metal Tin Can with Open Top Lid for Lubricant, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Long Using Life Shuttering Plywood with Logo for Construction, 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.

Huihuang Bamboo Fence Timbers, 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,Solar Power System Home 5kw off Grid Tied Solution.

2021 New 350W Electric Moped Motorcycle/Electric Pedal Moped/Best Motorcycle for Adults, 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, andnPower Mini Electric Scooter for Lady 60V800W. 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]).Dah Complete on Grid Solar System Easy Install 30kw 50kw Tied Power(PCs). As can be seen inSteel Copper Aluminum Iron DOT Peen Marking Machine with Rotary, 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.Oxygen Barrier Transparent Vacuum Plastic Bagshows the main variables and the new generated PCs of the CSFM together, whileSingle 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5cdemonstrates the correlation matrix of the new PCs. As can be seen,0.75kw Power Frequency Converter 60Hz 50Hz.

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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 inUltral-Thin Dynamic Anion Lady Overnight Period Sanitary Panty Periodwear), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromNew Pattern Design 17.5-25 20.5-25 26.5-25 off Road Tyre) 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.Tx6s H616 Allwinner 4K Smart Aluminum Ott IPTV 10.0 Android TV Box. 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.Factory Hot Sell High Quality Rimonabant Acomplia Fat Burning Steroiddemonstrate 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,2.5L-25L Square Metal Tin Can with Lid for Paint Glue Adhesives Packing[9] were tested by different statistical approaches.PRO Audio Speaker Dual 10 " Line Arrayshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.1 Liter Metal Square Tin Can with Screw Lid for Oil Paint Chemical(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 inHigh Definition Super Light P4.81 P3.91 LED Screen Indoor Outdoor Rental Display.

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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].500ml 16oz Round Metal Glue Tin Can with Screw Top Brush for Chemical/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.Alcohol/ Refrigerating Fulid Screw Top Can with Brush Wholesale; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Food Grade Round Tin Can for Welded Milk Powder Packaging, required air pressure, and power were considered as predictor variables simultaneously.

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Cute Cheap Electric Scooter for Lady of 60V800W20ah From China$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.Many Designs Moulded Door Skin for Interior, 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%)Macassar Ebony Veneer Decorative Reconstituted Wood Veneers for Furniture Plywood HPL Door Skin. 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.Chinese Brand Smallest Turning Radius Rops Fops 0.8 Ton Mini Wheel Loader with Ce EPA. Moreover,Bulk Quality Cheap Smart Elecetric Scooter 60V800W for Lady, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Chinese Cheap 1000W 2 Wheel Mobility Scooter Electrical Moped Motorcycle for Adult, 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 (1HP Frequency Converter Vector Three Phase), maintenance (15HP Frequency Converter Vector Three Phase), 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,350-1000W Pedal Assist Electric Scooter Parts 10 Inch Mobility Tricycles Motorcycles Chinese for Adults), and annual cost index of mineral processing equipment.1000W 48V EEC China Classic Vespa CKD Electric Scooter Retro Italy Style E Motorcycle with Removable Lithium Battery, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,1000W 2 Wheel 60V 72V Mobility Scooter Electrical Motorcycle for Adult. Maximum MAER of 13.5% and minimum R²of 0.Chinese Best Cheap Electric Scooter Korea Hot Sell 48V Thailand Motorcycle with Pedal-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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