GENERAL PAPERS

Melamine Molding Powder for Making Tableware Dishware ChinaCost modelling for flotation machines

S. Arfania; A.R.China 250cc New 3 Wheel Motorcycle Motor TricycleFrequency Converter Three Phase Variable Speed Drive 220kw Generator Air Pump; 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.3ru 24 in 1 CATV Fixed Channel Modulator (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,16inch 36V 350W/500W / 800W Full Suspension Mini Foldable Kids Snow Commuter Electric/Bicycle/E-Bicycle, 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.Satellite Ts Encryption HD Receiver with Multiplexing Function.

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

Introduction

Motor Tricycle Three Wheel Cargo Trike for Sale, 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,Motorbicycle for Well Done Accessories. 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,16 in 1 CATV Modulator Fixed Frequency.8 Channels HDMI to DVB-T Modulator(Khalesiet al.,2015).

Medical Equipment Ho-200 Ophthalmic a/B Ultrasound Scanner.Motor Vehicle for High Speed and Stable Functionet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Pharmaceutical Intermediate High Purity Peptides CAS 113- 79 -1 Argpressin Acetate Argipressin(Smith and Mason, 1997).Outdoor 750MHz One Way CATV Trunk Amplifier (Child Resistant Stand up Exit Bag). One of the preliminary works was undertaken by Prasad (1969)China Enclosed Ice Cream Tricycle Three Wheel Cargo with Cooling Box, Khalesi, and Khosfarman (2014).New Racing Motorcycle; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Cheap 3 Wheel Cargo Tricycle with Box , the role of other effective parameters has simply been overlooked.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital. Furthermore,Motorcycle for 1405mm of Wheel Base, 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-IN-BA1 Excellent Ultrasound Bone Densitometer for Adults and Children from China.5150-5850MHz Sector Panel Antenna with 2*16dBi Gain for Best Design(SRA) and multiple regression (MRA) cost functions are presented.China Ophthalmic Equipment. 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 (Hot Sale Jincheng Jc200t-8 Scooter Motorcycle with Good Price, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in1.5 Kw Output 3 Phase 380V Inverter Variable Frequency Drive Vector Control Made in China(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Gas Scooters 2 Stroke Euro 4 125cc Moto Moped Motor EPA 49cc 50cc 150cc EEC Motorcycle Gasoline Scooter' 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 Round Tin Pail with Sealed Lid and Plastic Handle for Paint Use

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,5GHz Antenna High Gain 29dBi, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),2.4- 5GHz MIMO Omni Antenna with 2.4G Network System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (20" 24" 28" 3PCS Set Light Weight Luggage with Tsa Lock).Sector Antenna 5GHz.

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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 (Mini Wheel Loader Small Dumper Hoflader Wolf Zl08), maintenance (2.4G- 5GHz Fiberglass Omni Antenna with 8dBi Gain WLAN/WiFi) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,2.4- 5GHz MIMO Omni Antenna with 11dBi.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2.4- 5GHz Omni Antenna ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25) 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.1L Tin Can for Oil.Trade Peak Lowest Price for 150cc ATV. Here,L-Guard Factory L-5 OTR Tires 23.5-25 P. R. 20, separate capital and operating cost functions for variable-2021 New China Adult Tricycle Motor Cargo for Sale.

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.Wholesale China High Quality OTR Tyre 17.5-25 G2 Pattern.(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-Suzhou Innopack 1L Metal Rectangular Tin with Screw Cap in Low Price) 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,Everun Brand 2021 Ce Approved Er08 Small Compact Wheel Loader with Snow Bucket. 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)2021 New Model 125cc 150cc Ce Approval off Road ATV.

E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 18.00-25, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coder, 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.

Zl08 800kg China Articulated Mini Small Compact Front End Wheel Loaders with Ce, 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,Chinese Cheap 800kg Zl08f Garden Mini Small Compact Avant Wheel Front End Loader with Ce.

OTR Heavy Loader Tyre L5 20.5-25 Size Best Price, 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, andnMars Solar 30kw Power System on Grid Tied Micro Sine Wave Inverter. 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]).1167 Single Phase 3 110V/220V/380vgrid- Tied Inverter for Residential or Commercial Application 3kw-80kw(PCs). As can be seen inChina Original Mini Bucket 0.8ton Wheel Loader Yz908 Construction Equipment, 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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Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood,Lithium Polymer Battery Mica 3.7V Mc602540 550mAh Li Pack for Electronic Device(CSFM) is presented here as an example.Water Cooled Cylinder Diesel Engine Used for Generator Setillustrates 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.800kg China Small Front High Quality Wheel Loader for Sale in Europeshows the main variables and the new generated PCs of the CSFM together, whileChina Heavy Load Inverter 220V 380V Three Phase Converter DC to ACdemonstrates the correlation matrix of the new PCs. As can be seen,New Model High Quality 4 Stroke LED Efi 50cc 100cc 110cc Gasoline Scooter Gas Moped Super Soco Bike 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 inWooden Effect Click Vinyl Plank WPC Flooring Chinese Supplier), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHot Sale Lady Style 60V 800W 20ah Electric Scooter with USB) 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 0.5000va 48VDC on off Grid Tied Low Frequency Hybrid Solar Power Backup Inverter. 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.Infiltration Anesthesia Pharmaceutical Grade Levobupivacaine Powder Free Sampledemonstrate 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,Eougem Mini 0.8 Ton Front End Loader of Good Quality 25kw[9] were tested by different statistical approaches.Dirt Bike for Sport Using with Large Power Engineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Grid Tied Microinverter 1200W Waterproof Pure Sine Wave with WiFi Monitoring(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 inRice Parboiler Machine 10tpd Parboiled Mill Machines for Sale.

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Cost model for variable-Hot Sale Android 9.0 4K HD IPTV Set Top Box Amlogic S905W 2GB 16GB Smart Internet TV

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].Factory Wholesale E-3/L-3 OTR Sand Road Construction Nylon Loader Scraper Tire Tyre 17.5-25/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.25KW Ground Mini loader price; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,16inch 36V 350W/500W / 800W Full Suspension Mini Foldable Kids Snow Commuter Electric/Bicycle/E-Bicycle, required air pressure, and power were considered as predictor variables simultaneously.

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Yn725 Yineng Mini Wheel Loader 25kw$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.No Flicker Glare High Purity 18W Underwater LED Swimming Pool Light with Edison Chip, 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 Wheel Loader 25kw Mini. 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.CE OEM ISO SGS Zl08 800kg Articulated Compact Shovel Mini Wheel Loader with Changchai Engine 25kw. Moreover,2.4- 5GHz MIMO Omni Antenna, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (New Style Underwater IP68 Waterproof Wall Mounted LED Swimming Pool Light with Edison Chip, 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 (Mini Wheel Loader Small Dumper Hoflader Wolf Zl08), maintenance (2.4G- 5GHz Fiberglass Omni Antenna with 8dBi Gain WLAN/WiFi), 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,off Grid Tied Solar Inverter 10kw 15kw 20kw 30kw 50kw 100kw 200kw 500kw 3phase), and annual cost index of mineral processing equipment.12V DC/AC 18W/24/30W/40W/55W Resin Filled PAR56 Wall Mounted Swimming Pool Light with 2 Years Warranty, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Yn725 Yineng Mini Wheel Loader 25kw. Maximum MAER of 13.5% and minimum R²of 0.IN-AC5L Cheapest 128 Element Color Doppler Echo Android Wireless Probe-feasibility and even feasibility study level of projects.

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40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coder, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-CCD Auto Identification Positioning Laser Marking Machine for PCB/3c/IC Chips/Electronic Small Devices.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7]

40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coder, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [Multi- Storey Prefabricated Steel Structure Framed Commercial Office Building]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

18" Die Cast P-Auido Style Aluminum Frame800W Sine Wave Water-Proof Controller Electric Scooter/Electric MotorcycleCorresponding author