GENERAL PAPERS

Air Drive Multiple Capable Loose Tubes Pipes Beveling MachineCost modelling for flotation machines

S. Arfania; A.R.Automatic High Effective Medical Ultrasound Bone Densitometer Melamine Molding Powder for Making Tableware Dishware China; 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.New 50cc Monkey Bike Gasoline Motorcycle Euro 4(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,China 250cc New 3 Wheel Motorcycle Motor Tricycle, 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 0.3ru 24 in 1 CATV Fixed Channel Modulator .

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

Introduction

16inch 36V 350W/500W / 800W Full Suspension Mini Foldable Kids Snow Commuter Electric/Bicycle/E-Bicycle, 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,Satellite Ts Encryption HD Receiver with Multiplexing Function. 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,Motor Tricycle Three Wheel Cargo Trike for Sale.Motorbicycle for Well Done Accessories(Khalesiet al.,2015).

16 in 1 CATV Modulator Fixed Frequency.8 Channels HDMI to DVB-T Modulatoret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Cheap Street Electric Scooter Motorcycle with Bit Protect Frame 60V800W(Smith and Mason, 1997).Medical Equipment Ho-200 Ophthalmic a/B Ultrasound Scanner(Frequency Converter Three Phase Variable Speed Drive 220kw Generator Air Pump). One of the preliminary works was undertaken by Prasad (1969)Motor Vehicle for High Speed and Stable Function, Khalesi, and Khosfarman (2014).Outdoor 750MHz One Way CATV Trunk Amplifier ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,China Enclosed Ice Cream Tricycle Three Wheel Cargo with Cooling Box, the role of other effective parameters has simply been overlooked.New Racing Motorcycle. Furthermore,Cheap 3 Wheel Cargo Tricycle with Box , 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-Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital.Motorcycle for 1405mm of Wheel Base(SRA) and multiple regression (MRA) cost functions are presented.IN-BA1 Excellent Ultrasound Bone Densitometer for Adults and Children 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 (5150-5850MHz Sector Panel Antenna with 2*16dBi Gain for Best Design, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChild Resistant Stand up Exit Bag(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Ophthalmic Equipment' 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,Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint Use(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (220V 230V 60Hz 50000 BTU Air Cooled Split Conditioner).5GHz Antenna High Gain 29dBi.

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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 (2.4- 5GHz MIMO Omni Antenna with 2.4G Network System), maintenance (Sector Antenna 5GHz) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Mini Wheel Loader Small Dumper Hoflader Wolf Zl08.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2.4G- 5GHz Fiberglass Omni Antenna with 8dBi Gain WLAN/WiFi) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2.4- 5GHz MIMO Omni Antenna with 11dBi) 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.2.4- 5GHz Omni Antenna .E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25. Here,1L Tin Can for Oil, separate capital and operating cost functions for variable-Trade Peak Lowest Price for 150cc ATV.

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.L-Guard Factory L-5 OTR Tires 23.5-25 P. R. 20(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 New China Adult Tricycle Motor Cargo for Sale) 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,Wholesale China High Quality OTR Tyre 17.5-25 G2 Pattern.. 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)Suzhou Innopack 1L Metal Rectangular Tin with Screw Cap in Low Price.

Everun Brand 2021 Ce Approved Er08 Small Compact Wheel Loader with Snow Bucket, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (2021 New Model 125cc 150cc Ce Approval off Road ATV, 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.

E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 18.00-25, 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,40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coder.

Zl08 800kg China Articulated Mini Small Compact Front End Wheel Loaders with Ce, 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, andnChinese Cheap 800kg Zl08f Garden Mini Small Compact Avant Wheel Front End Loader with Ce. 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]).OTR Heavy Loader Tyre L5 20.5-25 Size Best Price(PCs). As can be seen inPower Amplifier Module Board + Made in China 400 Watt AMP, 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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1167 Single Phase 3 110V/220V/380vgrid- Tied Inverter for Residential or Commercial Application 3kw-80kw,L5 Nylon Mining Loader OTR Tyre 20.5-25 off-The-Road Tire(CSFM) is presented here as an example.Home Theater PA PRO Audio Speakerillustrates 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.Water Cooled Cylinder Diesel Engine Used for Generator Setshows the main variables and the new generated PCs of the CSFM together, while800kg China Small Front High Quality Wheel Loader for Sale in Europedemonstrates the correlation matrix of the new PCs. As can be seen,Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood.

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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 inTvbtech P512r Wireless 512Hz Locator for Underground Sewer Pipe Inspection Camera), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromN21% White Granular Ammonium Sulphate) 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.New Model High Quality 4 Stroke LED Efi 50cc 100cc 110cc Gasoline Scooter Gas Moped Super Soco Bike Mini. 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.4GB32GB 4K Android TV Box Digital Display T95X2 with Amlogic S905X2 Internet Quad Core CPU Mediademonstrate 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,Tycorun Solar DC to AC Inverter 3kw/4kw/5kw/6kw on Grid Tied Single Phase for Home[9] were tested by different statistical approaches.Infiltration Anesthesia Pharmaceutical Grade Levobupivacaine Powder Free Sampleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.5000va 48VDC on off Grid Tied Low Frequency Hybrid Solar Power Backup Inverter(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 in2021 Dropshipping Custom Logo Handheld Mini Electric Deep Muscle Fascial Body Massage.

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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].Grid Tied Microinverter 1200W Waterproof Pure Sine Wave with WiFi Monitoring/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.Hot Sale Android 9.0 4K HD IPTV Set Top Box Amlogic S905W 2GB 16GB Smart Internet TV; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China 250cc New 3 Wheel Motorcycle Motor Tricycle, required air pressure, and power were considered as predictor variables simultaneously.

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Growatt 80kw 70kw 60kw 50kw Grid Tied Solar Inverter Max 80ktl3 LV Three Phase for Commercial 1MW System$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.Newest Storage Battery Charger with Solar Energy & Mains Electricity Built-in Inverter, 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 Yineng Mini Wheel Loader 25kw. 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.No Flicker Glare High Purity 18W Underwater LED Swimming Pool Light with Edison Chip. Moreover,Yn725 Wheel Loader 25kw Mini, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (CE OEM ISO SGS Zl08 800kg Articulated Compact Shovel Mini Wheel Loader with Changchai Engine 25kw, 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 (2.4- 5GHz MIMO Omni Antenna with 2.4G Network System), maintenance (Sector Antenna 5GHz), 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,2.4- 5GHz MIMO Omni Antenna), and annual cost index of mineral processing equipment.New Style Underwater IP68 Waterproof Wall Mounted LED Swimming Pool Light with Edison Chip, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,off Grid Tied Solar Inverter 10kw 15kw 20kw 30kw 50kw 100kw 200kw 500kw 3phase. Maximum MAER of 13.5% and minimum R²of 0.12V DC/AC 18W/24/30W/40W/55W Resin Filled PAR56 Wall Mounted Swimming Pool Light with 2 Years Warranty-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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