GENERAL PAPERS

Alloy Ldx 2101 Uns S32101 Stainless Steel PlateCost 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.Metal Cans 0.925 Liter Tin Barrel for Packaging Container(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,Frequency Inverter Pump AC Drive Price, 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.Frequency Inverter VFD AC Drive.

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

Introduction

Power Frequency Converter 60Hz 50Hz Price, 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,Frequency Converter for Water Pump. 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,Power Frequency Converter AC Drive Inverter.Good Quality Factory Directly 1000W 60V/70V/20ah Electric Motorcycle with Pedals(Khalesiet al.,2015).

0.5L Tin Can with Dry Cover.Food Grade Container 1 Liter Square Olive Oil Latest Design Metal Tin Canset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6(Smith and Mason, 1997).AC Frequency Converter 50Hz 60Hz Drive Inverter(1L High End Glass Vodka Wine Bottle with Matte Black Finish). One of the preliminary works was undertaken by Prasad (1969)Good Quality Electric Bike & Two-Wheel Dual Motor Foldable China Motorcycle for Adult, Khalesi, and Khosfarman (2014).Food Grade 3 Liter Square Olive Oil Tin Can with Handle and Cap; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Cheap Power Motor Big Protect Frame Electric Scooter Motorcycle 60V800W, the role of other effective parameters has simply been overlooked.850 Alicosolar 5kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage. Furthermore,Factory Price Manufacturer Supplier Cheap Electric Bike/Electric Motorcycle for Hot Selling, 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-Cheap Smart Lady's Electric Scooter 60V800W.Hot Selling Electric City Bike New Scooter E-Scooter Motorcycle as Children's Gifts(SRA) and multiple regression (MRA) cost functions are presented.Lady Scooter Motorcycle 2.5 16 Tire Custom Bike. 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 (0.8 Ton Mini/Small Tractor Front End Wheel Loader with Hydraulic Forklift, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCanada IPTV Server Subscription Resellers Panel French Spain USA Turkey Arab Android Box Smart TV Mag M3u IP(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Yn725 Yineng Mini Wheel Loader 18.5kw' 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,L55 Best Android High Quality Firmware Update Google Certifed Set Top Japanese Free Streaming Japan Smart TV Box

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Cheap Electric Scooter 500W Pedal Bicycle 25km/H for Export, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Big 4000W 70V Electric Scooter(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Custom Adult Diapers Manufacturers in Bulk).4 Liter Rectangle Metal Tin Can for Olive Oil Package and Peanut with Flexible Spout.

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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 (18L Square Metal Tin Cans with Handle and Lid for Oil), maintenance (Glue Tin Can with Plastic Lid / Square Metal Paint Sizes) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Grid Tied 30kw Solar PV System for Shingle Roof) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Good Quality Empty 1 Litre Metal Tin Paint Cans with Handle for Sale) 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.Pinergy Grid Tied Solar Panel System 6kw Energy 110V Single Phase.off Grid 5kw 10kw Solar Power System. Here,Pinergy 9kw on- Grid Tied Solar Power System for Home or Industrial Roof, separate capital and operating cost functions for variable-2013 Popular Electric Motorcycle 90km with Pedal CE .

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 Zl08f Wheel Loader 0.8ton Mini with Quick Hitch for Sale(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-Wolf Loader Wl80 Radlader Without 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,Yn725g Approved Hot Sale Mini Wheel Loader Yn725. 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)Er08 New CE Approved Small Shovel Loader.

Everun Brand New Generation CE Approved Er408 0.8ton Mini Front End Wheel Loader, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Hot Sale Mini Wheel Loader Yn725g, 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.

0.8 Ton Mini Front Loader Wl80 Shovel for Garden/Farm, 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,Low Frequency Inverter AC Drive.

Frequency Inverter Converter 50Hz 60Hz, 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, andnSingle Phase Mini AC DC Motor Speed Controller. 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]).Frequency Inverter Pump AC Drive Price(PCs). As can be seen inIP68 8W-42W Surface Mounted Multi-Color LED Underwater Swimming Light, 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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Inverter,AC Drive Inverter Low Frequency Power(CSFM) is presented here as an example.PA12 Transparent Polyamide with Anti-UV Granulesillustrates 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.Best Price Sab-500 Ophtalmic Ab Scanshows the main variables and the new generated PCs of the CSFM together, whileDecent Aluminum Foil Plastic Zipper Packing Bag for LED Light Strip/PCB Board Packing/IC Vacuum Packagingdemonstrates the correlation matrix of the new PCs. As can be seen,0.75kw Output Single Phase AC Converter Frequency Inverter VFD Pump.

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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 inWaterproof Wheeled Trolley Double Shoulder Business Travel Traveling Laptop Computer Notebook Leisure Backpack Bag with USB), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromBuy Food Grade Metal Material Empty Cans for 0.5-2.5L) 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.China AC Drive Manufacturers. 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.Biocar Multifunctional 2-Phenylbenzimidazole CAS 716- 79 -0 C13h10n2 with CE Certificatedemonstrate 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,China AC Drive Frequency Inverter Manufacturer Supplier[9] were tested by different statistical approaches.High Speed Full Size Adult 800W Z1000 Electric Motorcycleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Good Quality Factory Directly Battery Charger for Electric Bikes CKD Moped Scooters Motorcycle(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 in30 Pieces of Factory Direct Nailnina632-Frosted Smoked Black Water Ripple False Nails.

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Cost model for variable-1500W Electric Motorcycle

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].High Speed Electric Motorcycle Scooter/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.Bl-Xgz Electric Motorcycle; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Frequency Inverter Pump AC Drive Price, required air pressure, and power were considered as predictor variables simultaneously.

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Bl-Xgw Electric Motorcycle$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.Yineng Yn725 Mini Wheel Loader 18.5kw Cabin, 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%)Yn725 Mini Small Perkins Engine Wheel 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.21kw Grid- Tied Solar Power System with 25 Years Working Time. Moreover,Home Solar System 2kw Panel, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Morel Free Shipping 10kw on Grid Tied PV Solar System Home Use for Lighting Heating Air Conditioner, 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 (18L Square Metal Tin Cans with Handle and Lid for Oil), maintenance (Glue Tin Can with Plastic Lid / Square Metal Paint Sizes), 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,5 Liters Empty Round Paint Tin Packaging Containers Tins Cans with Triple Tight Lid), and annual cost index of mineral processing equipment.Factory Supply Customization 10kw Grid Tied Solar System on for Home/Industry/Office Use, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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