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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

12V AC Warm White PC Mini Flat Resin Filled LED Pool LightCost modelling for flotation machines

S. Arfania; A.R.Metal Tinplate Container Engine Oil Can with Screw CapFluid Storage Containers Lubricants for Use; 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.Square Tin Paint Packaging Can Lubricant Oil Containers(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,800W Electric Scooter/Motorcycle with LED Light, 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.Citycoco Electric Motorcycle E6 Cheap OEM E Bike.

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


Introduction

800W Deft Fresh Type Drum Brake Brushless Motor Electric Motorcycle, 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,Euro5. 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,Retro Scooters.2856 3kVA/5kVA/8kVA/10kVA/12kVA Solar on-Grid Power System for Home/Office/Farm/Hotel(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (China Titanhi Zl08 800kg Compact Agricultural 0.8t Micro Pay Loader 4WD, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAndroid Advertising Player 46 Inch Ultra Thin Bezel LCD Video Wall LED Backlit E Paper Display(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Compact structure mini loader/wheel loader/ with 0.8ton bucket for building construction' 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,800W High Speed Electric Scooter/Bike, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),800W 60V20ah Brushless Electric Motorcycles(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Polyester Lifting Flat Sling or Round).10L Customized Tin Cans Paint Coating Used Metal Square Can.

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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 (500W/ 800W / 1000W E Scooter/Electric Moped/Electric Bike), maintenance (Square Engine Oil Can Metal Paint Tin Container with Plastic Lid) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,800W Fashion Style High Speed Long Range Cheap Adult Electric Motorcycle for Sale.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Cheap Small Electric Scooter Moped 800W Motorcycle) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Frequency Converter for Small Power Motors 3pH 380V 50/60Hz) 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.Manufacturer of Rectangular Brake Oil Motor Engine Tin Can.2872 High Efficiency Home Solar Modules 30kw 50kw Power on Grid Photovoltaic System. Here,Automobile Paint Can 5L Square Tin with Metal Cap for Ink Oil, separate capital and operating cost functions for variable-866 5kw on Grid Solar System with Power Inverter for Home.

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.Food Grade Metal Tin Can with Printing Logo for Cooking Oil(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-Good-Tightness Square Tin Can Metal Engine Oil with Sscrew Lid) 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,800W Electric Scooter . 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)Good-Sealing Square Tin Can Engine Oil with Metal Lid.

0.15mm-1.0mm Okume/ Bintangor/ Sapelli Natural Veneer From Linyi Orikey Wood, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Special Design Braided Veneer with Red Walnut, 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.

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whereXobsis the observed value,xethe estimated value at time/placeI,and n,Vector Frequency Converter with High Performance for Automatic Production Equipment.

Natural Horizontal Bamboo Veneer for Panel Board, 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, andnFrequency Converter with SVC and Vf Control 380V 50/60Hz. 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]).Electric Motorcycle (PCs). As can be seen inSingle 10 Inches Passive/Active Full-Range Professional Loudspeaker, 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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China Hot Selling 2021 Mini Electric Scooter Mobility Motorbike Wholesale,Electric Motorcycle (CSFM) is presented here as an example.Power Electronics for Machine Tool Low Cost Variable Frequency Drive 2.2kwillustrates 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.Factory Supply Benzaldehyde CAS 100-52-7 99% with Best Price in Stockshows the main variables and the new generated PCs of the CSFM together, whileManufacturer Supply 1demonstrates the correlation matrix of the new PCs. As can be seen,Electric Motorcycle .

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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 inEnginecy part cylinder kit for Honda C70), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromCustomized Windows or Android Sunlight Readable Waterproof All Weather HDMI Touchscreen Monitor Ad LCD Display Digital Signage Kiosk) 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.Electric Motorcycle . 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.Football Basketball Soccer Stadium Sport Court High Mast Lighting Aluminum Floodlight 100W 200W 300W 500W 800W Outdoor LED Flood Lightdemonstrate 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,750ml Metal Tin Can Container for Chili Oil Canning[9] were tested by different statistical approaches.Grid Tied 30kw Solar PV System for Shingle Roofshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Hot Sale Food Packaging Tin Can for Cooking Oil with Plastic Lids(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 inProtective Face Mask.

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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].2L Galvanized Tin Cans for Cooking Oil with Plastic Lids/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.Electric Motorcycles ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,800W Electric Scooter/Motorcycle with LED Light, required air pressure, and power were considered as predictor variables simultaneously.

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800W Aluminium Alloy Wheel Hubs Sport Electric Motorcycle$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.Zl08 Chargeuse Wheel Loader, 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%)Professional Manufacturer Everun Er08 CE Approved Mini Cpmpact Front End 4 Wheel Bucket 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.500W EEC Electric scooter. Moreover,Electric Motorcycle , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Solar Electric Motorcycle, 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 (500W/ 800W / 1000W E Scooter/Electric Moped/Electric Bike), maintenance (Square Engine Oil Can Metal Paint Tin Container with Plastic Lid), 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,Wechip Customized Booting Logo Rk3318 H96 Max 4+32GB/4+64GB IPTV Set Top Box 4K), and annual cost index of mineral processing equipment.OEM 1500W EEC Electric Scooter , and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Cyclopropyl Acetylene/ Lide Pharma- Factory Supply / Best Price CAS 6746-94-7Professional Speaker Box F12+Corresponding author

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