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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

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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.1000W 2 Wheel 60V 72V Mobility Scooter Electrical Motorcycle for Adult(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,Chinese Best Cheap Electric Scooter Korea Hot Sell 48V Thailand Motorcycle with Pedal, 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.Hot Smart Electric Scooter 60V800W Power Motor with USB.

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


Introduction

Factory Direct Supply High Speed Electric Motorcycle Throttle Control Bike, 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,Cheap Street Electric Scooter Motorcycle with Bit Protect Frame 60V800W. 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 Tl08 Mini Wheel Loader with Low Price for Sale.Er08 Farm Mini Loader with Standard Bucket for Sale(Khalesiet al.,2015).

Yn725 Yineng Mini Wheel Loader 18.5kw.Ce Approved Mini Loader with Road Sweeperet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Windows Mini PC Pipo X10 PRO Z8350 Chipset Smart TV Box Android 5.1 4G RAM 64G ROM(Smith and Mason, 1997).2386 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use(High Impact Strength and Low Water Absorption Resin 610). One of the preliminary works was undertaken by Prasad (1969)Easy Installation Good Quality Factory Supply Grid Tied 10kw 12kw 15kw on Solar System for Commercial and Industrial Use, Khalesi, and Khosfarman (2014).Mars Solar 5kw on Grid Home Power System 5000W 5kVA 5000 Watts Energy Systems 10kw Tied; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,60V/72V 1200W Electric Scooter with Tianneng Battery, the role of other effective parameters has simply been overlooked.Best Price Solar Energy Systems Home Panel System 15kw 20kw on Grid. Furthermore,Customization Energy Solution 1kw 2kw 3kw 5kw 10kw 15kw 20kw 25kw 50kw on Grid/Grid Tied Solar Panel Power System, 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-Metal Cans 0.925 Liter Tin Barrel for Packaging Container.Frequency Inverter Pump AC Drive Price(SRA) and multiple regression (MRA) cost functions are presented.Frequency Inverter VFD AC Drive. 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 (Power Frequency Converter 60Hz 50Hz Price, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCo-Soluble Polyamide Resin with Top Quality(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Frequency Converter for Water Pump' 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,AC Frequency Converter 50Hz 60Hz Drive Inverter

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Good Quality Electric Bike & Two-Wheel Dual Motor Foldable China Motorcycle for Adult, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Food Grade 3 Liter Square Olive Oil Tin Can with Handle and Cap(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Customized Cheap Promotion Cooler Bag).Cheap Power Motor Big Protect Frame Electric Scooter Motorcycle 60V800W.

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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 (850 Alicosolar 5kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage), maintenance (Factory Price Manufacturer Supplier Cheap Electric Bike/Electric Motorcycle for Hot Selling) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Cheap Smart Lady's Electric Scooter 60V800W.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Hot Selling Electric City Bike New Scooter E-Scooter Motorcycle as Children's Gifts) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Lady Scooter Motorcycle 2.5 16 Tire Custom Bike) 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.0.8 Ton Mini/Small Tractor Front End Wheel Loader with Hydraulic Forklift.Yn725 Yineng Mini Wheel Loader 18.5kw. Here,Wheel Loader Mini Wolf Wl80 with Forks, separate capital and operating cost functions for variable-Zl08 0.8 Ton Agricultural Farm Articulated Mini Wheel Loader with Hydraulic System.

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.Wolf Wl80 Mini Radlader Hoflader with Forks in Farm(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-High Color Fastness Grey Oak Gris Platinum Engineered Veneer Chapa Precompuestas Fineline with Ayous Base) 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,L55 Best Android High Quality Firmware Update Google Certifed Set Top Japanese Free Streaming Japan Smart TV Box. 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)Cheap Electric Scooter 500W Pedal Bicycle 25km/H for Export.

Big 4000W 70V Electric Scooter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (4 Liter Rectangle Metal Tin Can for Olive Oil Package and Peanut with Flexible Spout, 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.

18L Square Metal Tin Cans with Handle and Lid for Oil, 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,Glue Tin Can with Plastic Lid / Square Metal Paint Sizes.

Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service, 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, andnGrid Tied 30kw Solar PV System for Shingle Roof. 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]).Good Quality Empty 1 Litre Metal Tin Paint Cans with Handle for Sale(PCs). As can be seen inE0 Glue White Bleached Poplar Plywood Bb/Bb Grade High Quality Carb Certificated, 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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off Grid 5kw 10kw Solar Power System,Pinergy 9kw on- Grid Tied Solar Power System for Home or Industrial Roof(CSFM) is presented here as an example.Uns 2205 S32750 Hot/Cold Rolled Bright Polished Corrosion Roofing Constructions Industry Decorate Stock Ba 2b Hl 8K Stainless Steel Ss Sheets/Plates/Coilsillustrates 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.Double 12inch Active Coaxial 29kg Line Array Speaker Systemshows the main variables and the new generated PCs of the CSFM together, whileAl-Gw6 Fast Electric Motorcycle Speed 60km/H Kitsdemonstrates the correlation matrix of the new PCs. As can be seen,2013 Popular Electric Motorcycle 90km with Pedal CE .

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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 inWholesale Mouse Talking Simulated 10 Inch Grey Stuffed Toy), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromMacassar Ebony Veneer Decorative Reconstituted Wood Veneers for Furniture Plywood HPL Door Skin) 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.Wolf Loader Wl80 Radlader Without Cabin. 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.ISO9001 Certificate Factory Supply Nylon 6pr New Motorcycle Tyre Tubesdemonstrate 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,Yn725g Approved Hot Sale Mini Wheel Loader Yn725[9] were tested by different statistical approaches.Professional Mini Wheel Loader for Sale with Low Priceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Er08 New CE Approved Small Shovel Loader(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 inLaser Waist Bag Chest Bags Transparent Women Crossbody Designer Sports Handbag.

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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].Hot Sale Mini Wheel Loader Yn725g/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.0.8 Ton Mini Front Loader Wl80 Shovel for Garden/Farm; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Chinese Best Cheap Electric Scooter Korea Hot Sell 48V Thailand Motorcycle with Pedal, required air pressure, and power were considered as predictor variables simultaneously.

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Single Phase Mini AC DC Motor Speed Controller$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.Frequency Inverter Pump AC Drive Price, 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%)Jarol Frequency Inverter JAC200 3 Phase 380V 4kw. 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.Inverter. Moreover,AC Drive Inverter Low Frequency Power, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (0.75kw Output Single Phase AC Converter Frequency Inverter VFD Pump, 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 (850 Alicosolar 5kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage), maintenance (Factory Price Manufacturer Supplier Cheap Electric Bike/Electric Motorcycle for Hot Selling), 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,AC Drive Variable Drive), and annual cost index of mineral processing equipment.China AC Drive Manufacturers, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,China AC Drive Frequency Inverter Manufacturer Supplier. Maximum MAER of 13.5% and minimum R2of 0.Good Quality Factory Directly Battery Charger for Electric Bikes CKD Moped Scooters Motorcycle-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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