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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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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

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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.Variable Speed Drive Phree Phase Frequency Converter 1000Hz(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,Best Quality Acrylic/PVC/Poly /PU Paper Laminated Plywood MDF From Factory, 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 0.3 Phase VFD AC Drives 1.5kw 2.2kw 4kw Variable Frequency Drive.

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


Introduction

Carb P2 Okoume Plywood for Furniture, 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,15mm AAA Grade Film Faced Plywood with WBP Glue. 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 Energy Saving AC Water Pump Inverter 3pH Cabinet VFD with High Quality.Hot Sale 250ml Small Can of DOT3 Brake Oil Tinplate Packaging(Khalesiet al.,2015).

150CC Go Kart .Full Size 150cc Go Kart et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antenna(Smith and Mason, 1997).Go Kart (Manufacturer of Enigine Oil Can). One of the preliminary works was undertaken by Prasad (1969)Emtpy 250L Round Clutch Brake Fluid Small Can with Plastic Lid, Khalesi, and Khosfarman (2014).Wolf Wl80 Mini Dumper Euro 5 Loader for Sale; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,0.8 Ton Chinese Low Cost High Quality Hydraulic Wheel Loader, the role of other effective parameters has simply been overlooked.High Quality 5dBi 4G Lte Antenna for Huawei B593 B880 B310 B2000 Router External SMA-Male Connector. Furthermore,WLAN WiFi Yagi Antenna, 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-External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antenna.150cc Go Kart with EEC (SRA) and multiple regression (MRA) cost functions are presented.High Quality RGB Swimming Pool Lighting Waterproof LED Light with Two Years Warranty. 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 (Grid Tied 5kw Solar Energy System Home Power 5000W for Roof Tile, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFinished Surface HD Truck Wheel 17.5inch Rims Steel(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Quality Wall Mounted Underwater LED Swimming Pool Light for Intex Pools or Theme' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,15kw Grid Tied Solar Power System for Home Use, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Grid Tied 100kw 200kw 300kw Solar System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High Strength Wave Type Galvanized Color Coated Roof Sheet Metal in Ral).Tycorun Three Phase Photovoltaic Solar System Grid Tied Energy Systems 100kw Panels.

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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 (Factory Direct Sale Grid Tied Solar Power System on 1000wp 5000wp 10000wp for Wholesale), maintenance (Vimode Electric Scooter Adult Motorcycle for Adults 800W 650W) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Adv. 1 Alloy Wheel .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (150cc 4-Stroke) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Outdoor 5GHz 30dBi Long Range Parabolic Grid Antenna) 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 Popular Model 60V 800W Electric Motorcycle for India Market.Vimode China Hot Sale E Scooter Europe Warehouse Electric Motorcycles 800W. Here,New Design 800W 1000W Electric Scooter Motorcycle for Riding, separate capital and operating cost functions for variable-5.8GHz 30dBi Single-Pol Die Cast Grid Antenna.

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.Mimo Antenna 5150MHz~5850MHz WiFi Panel(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-5GHz 20dBi Panel WiFi Antenna) 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,Fast Ship 800W 1000W 1200W 60V 72V 20ah Battery Electric Motorcycle From China. 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)Hot Sale 2.4/ 5GHz 9dBi Rubber WiFi Antenna.

5GHz 12dBi Dual Polarity MIMO Omni Antenna, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Electric Motorcycle Fashion Design 800W with Removable Battery, 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.

5GHz 18dBi Dual Polarization Panel WLAN Antenna, 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,Guangzhou Manufacturer Empty Anti Bacterial Diesel Additive Can for Fuel Cleaner.

Hot Sale Special Cooking Coconut Oil Tin Can Milk Tank Beverage Cans, 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, andnBuy Food Grade Metal Material Empty Cans for 0.5-2.5L. 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]).Hot Sale 301 401 Easy Opening Seal Can Round Empty Tin with Metal Caps(PCs). As can be seen inLocal Anesthetic Levobupivacaine Powder Brazil Free Sample 27262-48-2, 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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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.2021 New Arrival China Supplying Internet TV Set Top Box Smart 4K HD 4GB Android 9 Amlogic S922Xshows the main variables and the new generated PCs of the CSFM together, whileEngine Timing Kits for Cadillac Allante 4.6L V8 281 Cid 1993demonstrates the correlation matrix of the new PCs. As can be seen,Alloy Wheels .

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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 inRhinestone Elephant Fashion Jewelry Brooch), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from1L Microstome Metal Drum Customization Printing Logo) 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 0.15-20 Inch Quality Auto Alloy Wheels 4*4 Wheel for Trailer. 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.3 Phase Frequency Converter 50Hz to 60Hz Variable Drive Manufacturer Solar Modulesdemonstrate 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,High Efficiency Waterproof Grid Tied PV Inverter 230V DC to AC[9] were tested by different statistical approaches.2021 New Design Plastic Injection Molding Machine Made in Chinashows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Finished Surface HD Truck Wheel 17.5inch Rims Steel(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 inOutdoor Waterproof Lighting RGB 100 Watt 400 500 LED Flood Light.

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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].18mm Carb Birch Okoumen Plywood/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.Retro Electric Motorcycle Scooter ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Best Quality Acrylic/PVC/Poly /PU Paper Laminated Plywood MDF From Factory, required air pressure, and power were considered as predictor variables simultaneously.

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High Quality 18mm Carb Birch Okoumen Plywood$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 0.1.5kw 220V Frequency Converter Single Phase 380 3, 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%)Carb Approved Birch Plywood. 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.Carb E0 Cabinet Grade 18mm Plywood in High Quality. Moreover,1.5kw 220V Frequency Inverter Brands AC Drive for Electric Motor, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (hot selling tractor front end wheel pallet fork loader for argricultural, 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 (Factory Direct Sale Grid Tied Solar Power System on 1000wp 5000wp 10000wp for Wholesale), maintenance (Vimode Electric Scooter Adult Motorcycle for Adults 800W 650W), 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,Titan Mini Earthmoving Front End Loader Wheel Zl08 with Ce Certificate), and annual cost index of mineral processing equipment.Carb Bleach White Poplar Plywood LVL 12mm 18mm, and over- extrapolation could result in misguiding estimates.

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Mular, A.L. 1982.Sunpal 150kw Solar Grid Tied System Low Price.5GHz 19dBi Enclosure WLAN Antenna.16 17 18 Inch Vossen CV5 Alloy Wheel, Montreal. 265 pp.         [Yn725g 18.5kw Cabin Yineng Mini Wheel Loader]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.VFD Air Compressor Asynchronous Variable Frequency Drive.Tubeless Steel Wheel .16 17 18 Inch Vossen CV5 Alloy Wheel, Montreal. 319 pp.         [Crovell Supply Raw Material CAS 104-29-0 Chlorphenesin for Cosmetic]

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Prasad, L. 1969.Brown Black Opaque Chemical Industrial Container 100ml Flip Top Cap Bottle.High Quality Waterproof 18W PAR56 RGB 12V LED Swimmiong Pool Light with Two Years Warranty, Metallurgy and Petroleum, Montreal. pp. 3-15.         [Hot Sale Am 20 "Mountain Bike with 21 Speeds]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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