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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

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.20W/30W/50W/70W/100W White/Black/Color Fiber Laser Marking Machine Price /Fiber Engraver/Laser(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,for HP Laptop Mc06 11.1V 4400mAh 49wh Li-on Battery Envy M7-N000, 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 0.600W- 800W 48V/60V Lead-Acid Battery Electric Scooter.

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


Introduction

Best Selling Electric Scooter Mini 800W , 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,150cc Automatic Racing Sports Exclusive Design ATV . 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 Quality Cheap 200cc and 150cc Farm Utility ATV.1GHz Outdoor Bi-Directional CATV Amplifier(Khalesiet al.,2015).

New Mini Willys Jeep Available on 110cc.Hot Sell 800W Delivery City Electric Scooter for Take-out Businesset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Factory Directly Sell Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Oil Cup(Smith and Mason, 1997).2021 Hot Selling Cheapelectric Mini Dirt Bike Lithium Battery Powered 500/ 800W Fat Mountain Electric(Professional Audio PA Subwoofer Component Speakers). One of the preliminary works was undertaken by Prasad (1969)My-A010b-N Medical Ultrasound Instruments Convex Handheld Wireless Probe, Khalesi, and Khosfarman (2014).3kw Liquid Cooling UHF Digital TV Transmitter DTV; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,He-1000ap Ophthalmic Ultrasound a Scan Biometer Pachymeter, the role of other effective parameters has simply been overlooked.IN-AC5L ICEN WiFi Wireless Linear Ultrasound Probe Scanner. Furthermore,Sanland 860MHz 34dB Gain CATV Forward Push-Pull Amplifier Module , 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-Bi-Directional Transmission Distribution Amplifier SA822.Encryption Ts Satellite IRD(SRA) and multiple regression (MRA) cost functions are presented.Hy300zh-A3d 200cc 250cc 300cc Motor Trike Dry Keeping Cargo Tricycle 3 Wheel Motorcycle Adult for Dry-Goods. 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 (Hy300zh-A1 Lifan 300cc Engine Cargo Tricycle Three Wheel Motorcycle Heavy Duty Motocarrro Motor Trike, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inLinyi 9mm/12mm/15mm/18mm Pine/Bintangor/Okoume Film Faced Plywood(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;2021 Best Sale 150cc Adults 4 Wheeler Petrol Power Racing Quad' 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,250cc Oil Cooling Dirt Bike with EPA

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Sanyou Slg New Efi System 125cc -150cc 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),250cc Gasoline off Road Motorbike(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Custom Men's Round Neck Fashion Plain Casual Soft T Shirts Logo Private Label Pocket Slim Fitted T-Shirt).0.6m 5GHz Parabolic Antenna with Gain 28dBi.

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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 (Wholesale 90cc 110cc 125cc 150cc off Road Gasoline Go Cart), maintenance (150cc 200cc 250cc ATV Quad Bike for Adults) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,4 Stroke Buggy 150cc ATV.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Pool Lamp with Ce RoHS) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (The Newest 110cc 125cc 150cc Toyota Mini Buggy ) 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.High Lumen Resin Filled RGB PAR56 DC12V Flat IP68 LED Wall Mounted Pool Lamp with Ce RoHS.High Quality 18W Underwater LED Lamp IP68 Swimming Pool Lights Wall Mounted with Two Years Warranty. Here,0.4m 5GHz Parabolic Antenna with Gain 23dBi, separate capital and operating cost functions for variable-Mars Solar 30000 W PV System Grid Tied Inverter 30000W Easy Install 30kw on Price.

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.5 Wheels Gasoline Cargo Tricycle with Front Cabin(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-IP68 Waterproof High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Pool Light) 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,Sofar Grid Tied 100kw Inverter 3 Phase 380V 400V 80kw 125kw 136kw on. 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)New Mini Willys Jeep Available on 110cc.

150cc ATV for Adults Lmatv-150hm, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (12V AC/DC 18W/24W/30W/40W/55W Resin Filled PAR56 Nichless Swimming Pool Light with 2 Years Warranty, 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.

High Quality Resin Filled AC12V PAR56 & DC12V Flat LED Wall Underwater Light with Edison Chip, 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,L5s Underground Ming Tyres Smooth Pattern 12.00-24 17.5-25 18.00-25 26.5-25.

150cc Quad 4WD ATV for Adults, 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, andnLight Source Be Glued IP68 LED Underwater for Swimming Pool with Two Years Warranty. 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]).IP68 Waterproof High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Underwater Pool Light with Edison Chip(PCs). As can be seen inBest Price Ultrasound Scanner Wireless Probe Double Heads 3 in 1 Cardiac / Convex Linear Color Doppler for Adriod/iPad, 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.PA 10 -35W 5.25'' Sound Ceiling Speakershows the main variables and the new generated PCs of the CSFM together, whileAluminum Speaker Box for 3" Column demonstrates the correlation matrix of the new PCs. As can be seen,2021 Selling The Best Quality Cost-Effective Products LED Swimming Pool Light with Edison Chip.

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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 inFashion Flower Brooch), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHPM766 Dry diaphragm membrane sanitary pressure transducer) 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 0.2 Ton Loader 3 Wheel Cargo Tricycle. 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.Power Amplifiers PA Speaker System Amplifier 1000 Wattdemonstrate 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,Grid Tied Inverter 3kw[9] were tested by different statistical approaches.Dual 10inch PA Audio Line Array Speaker Box Systemshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.5kw Solar PV Kit Power Gird Tied Inverter(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 inQt3-15 Full Automatic Hollow Brick Color Paving Machine.

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Cost model for variable-Factory Mining Tyre

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].Low Frequency Solar Inverter Hybrid Mode Grid- Tied and Store Power/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.150cc Front Cabin Cargo Tricycle; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,for HP Laptop Mc06 11.1V 4400mAh 49wh Li-on Battery Envy M7-N000, required air pressure, and power were considered as predictor variables simultaneously.

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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.1L Paint Tin Cans/Empty Food Grade Can with Lid. Moreover,17.5-25 20.5-25 23.5-25 26.5-25 29.5-25 OTR Tire for Loaders, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (20.5-25/29.5-25/23.5-25/14.00-24/7.50-16 New E-3/L-3 Loader OTR Bias Tyre, 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 (Wholesale 90cc 110cc 125cc 150cc off Road Gasoline Go Cart), maintenance (150cc 200cc 250cc ATV Quad Bike for Adults), 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,High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Swimming Pool Lights), and annual cost index of mineral processing equipment.China Electric Tricycle 350W 500W 800W for Adult, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Llantas High Quality L5 OTR Tyre 26.5-25. Maximum MAER of 13.5% and minimum R2of 0.1L Empty Round Brake Fluid Can Boxes-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Komatsu PC270-7 Arm Cyl KetDouble 12" Line Array SpeakerCorresponding author

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