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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.Portable Handheld Metal Plastic DOT Peen Marking Machine(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,5150-5850MHz Sector Panel Antenna with Gain 13dBi, 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.Dirt Bike for Sport Using with Large Power Engine.

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


Introduction

Electricity Saver Device , 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,3 Phase 50 - 60Hz Intelligent Power Saver. 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,High Efficient Industrial Electric Motor Power Saver.EEC 125/300cc Euro 5V Max Scooter-Alex One(Khalesiet al.,2015).

Electricity Power Reducer .Nylon OTR Bias Tyre/Tire Manufacture E3/L3 15.5-25 17.5-25 20.5-25et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 15kw Solar Inverter Grid Tied(Smith and Mason, 1997).Electrical Saver Box (Gy6 -125/ 150ccformaular). One of the preliminary works was undertaken by Prasad (1969)Sector Panel Antenna , Khalesi, and Khosfarman (2014).15.5-25 17.5-25 20.5-25 23.5-25 OTR Tire; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Growatt 2kw on Grid Inverter 2000W Tied for Solar Power System Home, the role of other effective parameters has simply been overlooked.Motorbike for 320cc with Police Cruiser Using Dry Weight 180kg. Furthermore,Heavy Duty Truck Tire 17.5-25 20.5-25 23.5-25, 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-Three Wheel Motor Tricycle Rickshaw Rear Axle.Gas Powered Adult Tricycle Motor Farm(SRA) and multiple regression (MRA) cost functions are presented.Motorcar for Both Civilc and Police Using with 320cc Displacement. 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 (Police Using of Motorcycle for Cruiser with Displacement 320cc, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Coffee /Candy/Weed Plastic Container(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Quality Cylindrical Li-ion 12V 40ah 80ah Rechargeable Lithium Battery Pack for Portable Device' 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,150ah Lithium Iron Phosphate , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),2.4-2.5GHz/5-5.8GHz Dual Frequency WiFi Antenna Internet for Things(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (50 Inch Ultra HD Television Smart LED TV 4K).E3/L3 17.5-25 20.5-25 1800-25 Durable Tyres for Scrapers.

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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 (C Band Satellite TV Antenna 150cm), maintenance (Eougem Original Cheap Radlader 0.8ton with Standard Bucket Made in China) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dsola ODM/OEM Design High Efficient Mc4 Connector 3 in 1.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Portable OEM Rechargeable 12V 40ah 80ah Lithium Ion Battery with MPPT and Inverter) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Mc4t-Branch Connector for Parallel Solar Panel Pair Male and Female) 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.4000W/5000W off Grid Tied Solar Power System.Internet TV Box Linux IPTV Zgemma I55. Here,L-Guard Wheel Loader L-5 OTR 45/65-45 Cheap Wholesale Tyres, separate capital and operating cost functions for variable-High Quality 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty.

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.24V 40ah Lithium Iron Battery for Electric Bike(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-Dsola Chinese Supplier Multipurpose Mc4 Y Branch Connector) 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,Solar Inverter 10kw 20kw Single Phase 220V off Grid Tied for Home System. 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)Dsola Customized High Heat Resistance 2 Pins Mc4 Solar Connector.

Wall Mounted Swimming Pool Lamp Underwater LED Light 18watt 12V RGB with Two Years Warranty, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (2074 Growatt Inverter 9kw on Grid 9000W Tied Solar Power System Home, 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.

Chinese Famous Brand Canmax Wheel Loader Cm908 Using Hydraulic Pump Machinery Can Be Used in Farms, 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,Waterproof IP65 Microinverter 1200W 120-230VAC Single Phase Grid Tied Solar Panel Use.

Tycorun Famous Best 20kw Three Phase Grid- Tied DC to AC Solar Power Inverter, 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, andnSolis 10kw Grid Tied Inverter Solis-10K-4G-LV Three Phases. 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]).New Pattern Design 17.5-25 20.5-25 26.5-25 off Road Tyre(PCs). As can be seen inSquare Engine Oil Tin Can with Screw Cap Manufacturer Lid, 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.Diesel Engine Parts Fuel Injection Nozzle 156sm420shows the main variables and the new generated PCs of the CSFM together, whileGy6 Engine 150cc Scooterdemonstrates the correlation matrix of the new PCs. As can be seen,12V/24V/48V/60V/72V/96V LiFePO4 Battery 40ah/50ah/60ah/100ah/200ah Lithium Ion.

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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 inHigh Quality Waterproof Flexible LED Neon 12V 24V 220V for Indoor Lighting and Outdoor Decoration), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromAftermarket BV45 53039880337 Turbocharger for 2010-12 Nissan Pathfinder Navara Engine) 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.Dsola Cheap Wholesale Multi Contact Mc4 Solar Connector Diode. 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.Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetatedemonstrate 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,China Famous Brand Hr912 Shovel Loader for Agriculture Working[9] were tested by different statistical approaches.Yn725 Yineng Mini Wheel Loader 18.5kw Cabinshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Tanfon 5kVA off Grid Solar Inverter Tied /off Grid/Hybrid System(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 inEmpty Oil Glass Container/ Vinegar Bottle.

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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].Solis 3 Phase 10kw 12kw 15kw 20kw Grid- Tied Inverter/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.China Factory Lithium 150ah Battery with BMS AC Output; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,5150-5850MHz Sector Panel Antenna with Gain 13dBi, required air pressure, and power were considered as predictor variables simultaneously.

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Steel Copper Aluminum Iron DOT Peen Marking Machine with Rotary$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.RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty, 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%)Made in China Strong Compact Mini Front Loader . 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.2021 Best Selling 500W Electric Moped E Bike Bicycle with Pedals. Moreover,Manufacture 20W Fiber Laser Marking Machine for Engraving, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (3kw Air-Cooled UHF Digital TV Transmitter DTV, 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 (C Band Satellite TV Antenna 150cm), maintenance (Eougem Original Cheap Radlader 0.8ton with Standard Bucket Made in China), 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,RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports), and annual cost index of mineral processing equipment.Wholesale High Performance Metal Mc4 Connector, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,No Flicker Glare High Purity RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Edison Chip. Maximum MAER of 13.5% and minimum R2of 0.1L Four-Color Cmyk Printing Lubricant Oil Packaging Tin Can for Car-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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