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On-line version ISSN2411-9717
Print version ISSN2225-6253

J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017

http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

GENERAL PAPERS

L-Pyroglutamic AcidCost modelling for flotation machines

S. Arfania; A.R.150cc Cheap Open Gas Reverse Trike Polyamide Resin for Gravure Plastic and Paper Printing Ink; 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.Sport Using Motor Vehicle with Sealed Chain Final Drive(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,GS-a 12mm CATV Fixed RF Attenuator, 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 0.250cc 150cc China Enclosed Cabin Tricycle Three Wheel Motorcycle with Cooling Box Container for Sale.

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


Introduction

Automatic High Effective Medical Ultrasound Bone Densitometer , 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,New 50cc Monkey Bike Gasoline Motorcycle Euro 4. 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,China 250cc New 3 Wheel Motorcycle Motor Tricycle.3ru 24 in 1 CATV Fixed Channel Modulator (Khalesiet al.,2015).

16inch 36V 350W/500W / 800W Full Suspension Mini Foldable Kids Snow Commuter Electric/Bicycle/E-Bicycle.Satellite Ts Encryption HD Receiver with Multiplexing Functionet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 3ton Hydraulic Hand Pallet Truck Trolley Special(Smith and Mason, 1997).Motor Tricycle Three Wheel Cargo Trike for Sale(Air Drive Multiple Capable Loose Tubes Pipes Beveling Machine). One of the preliminary works was undertaken by Prasad (1969)Motorbicycle for Well Done Accessories, Khalesi, and Khosfarman (2014).16 in 1 CATV Modulator Fixed Frequency; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,8 Channels HDMI to DVB-T Modulator, the role of other effective parameters has simply been overlooked.Medical Equipment Ho-200 Ophthalmic a/B Ultrasound Scanner. Furthermore,Motor Vehicle for High Speed and Stable Function, 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-Outdoor 750MHz One Way CATV Trunk Amplifier .China Enclosed Ice Cream Tricycle Three Wheel Cargo with Cooling Box(SRA) and multiple regression (MRA) cost functions are presented.New Racing Motorcycle. 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 (Cheap 3 Wheel Cargo Tricycle with Box , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMelamine Molding Powder for Making Tableware Dishware China(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital' 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,Hot Sale Jincheng Jc200t-8 Scooter Motorcycle with Good Price

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,China Gas Scooters 2 Stroke Euro 4 125cc Moto Moped Motor EPA 49cc 50cc 150cc EEC Motorcycle Gasoline Scooter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Best Selling Ophthalmic Ultrasound a/B Scanner Full Digital Touch Screen(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Advertising fashion white waterproof PVC leather cosmetic bag with logo).Ho-100 Ophthalmic Ultrasound a Scan Pachymeter.

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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 (Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler), maintenance (Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint Use.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (5GHz Antenna High Gain 29dBi) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2.4- 5GHz MIMO Omni Antenna with 2.4G Network System) 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.Sector Antenna 5GHz.Mini Wheel Loader Small Dumper Hoflader Wolf Zl08. Here,2.4G- 5GHz Fiberglass Omni Antenna with 8dBi Gain WLAN/WiFi, separate capital and operating cost functions for variable-2.4- 5GHz MIMO Omni Antenna with 11dBi.

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.2.4- 5GHz Omni Antenna (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-E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25) 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,1L Tin Can for Oil. 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)Trade Peak Lowest Price for 150cc ATV.

L-Guard Factory L-5 OTR Tires 23.5-25 P. R. 20, 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 China Adult Tricycle Motor Cargo for Sale, Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables 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.

Wholesale China High Quality OTR Tyre 17.5-25 G2 Pattern., 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]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,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, 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).

whereCeis the estimated cost,Cathe actual cost, andn2021 New Model 125cc 150cc Ce Approval off Road ATV. 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]).E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 18.00-25(PCs). As can be seen inChild Resistant Stand up Exit Bag, 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 andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere 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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Zl08 800kg China Articulated Mini Small Compact Front End Wheel Loaders with Ce,Chinese Cheap 800kg Zl08f Garden Mini Small Compact Avant Wheel Front End Loader with Ce(CSFM) is presented here as an example.Power Amplifier Module Board + Made in China 400 Watt AMPillustrates 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.China Original Mini Bucket 0.8ton Wheel Loader Yz908 Construction Equipmentshows the main variables and the new generated PCs of the CSFM together, whileHome Theater PA PRO Audio Speakerdemonstrates the correlation matrix of the new PCs. As can be seen,OTR Heavy Loader Tyre L5 20.5-25 Size Best Price.

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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)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated in2021 350W Waterproof Anti- Theft Sharing Ebike Mz-974), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Heavy Load Inverter 220V 380V Three Phase Converter DC to AC) 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 0.1167 Single Phase 3 110V/220V/380vgrid- Tied Inverter for Residential or Commercial Application 3kw-80kw. 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.N21% White Granular Ammonium Sulphatedemonstrate 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,L5 Nylon Mining Loader OTR Tyre 20.5-25 off-The-Road Tire[9] were tested by different statistical approaches.Hot Sale Lady Style 60V 800W 20ah Electric Scooter with USBshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood(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 Small Jacquard Pattern Pillow Cover Fabric.

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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].New Model High Quality 4 Stroke LED Efi 50cc 100cc 110cc Gasoline Scooter Gas Moped Super Soco Bike Mini/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.Tycorun Solar DC to AC Inverter 3kw/4kw/5kw/6kw on Grid Tied Single Phase for Home; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,GS-a 12mm CATV Fixed RF Attenuator, required air pressure, and power were considered as predictor variables simultaneously.

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Grid Tied Microinverter 1200W Waterproof Pure Sine Wave with WiFi Monitoring$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.Hot Sale Android 9.0 4K HD IPTV Set Top Box Amlogic S905W 2GB 16GB Smart Internet TV, 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%)Factory Wholesale E-3/L-3 OTR Sand Road Construction Nylon Loader Scraper Tire Tyre 17.5-25. 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.25KW Ground Mini loader price. Moreover,Growatt 80kw 70kw 60kw 50kw Grid Tied Solar Inverter Max 80ktl3 LV Three Phase for Commercial 1MW System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Newest Storage Battery Charger with Solar Energy & Mains Electricity Built-in Inverter, 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 (Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler), maintenance (Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer), 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,Yn725 Yineng Mini Wheel Loader 25kw), and annual cost index of mineral processing equipment.No Flicker Glare High Purity 18W Underwater LED Swimming Pool Light with Edison Chip, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Yn725 Wheel Loader 25kw Mini. Maximum MAER of 13.5% and minimum R2of 0.CE OEM ISO SGS Zl08 800kg Articulated Compact Shovel Mini Wheel Loader with Changchai Engine 25kw-feasibility and even feasibility study level of projects.

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2021 New China Adult Tricycle Motor Cargo for Sale, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-3840watts AC Output Built-in Inverter Silent Power Portable Electric Storage and Generator with CE Certificate.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Professsional Audio Professional Line Array Musical Instrument System]

2021 New China Adult Tricycle Motor Cargo for Sale, 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.         [Carbide Nibs / Wire Nibs/ Drawing Dies]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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