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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.Color Custom Diesel Engine with Four-Stroke for Generator Set(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,Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines, 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.Diesel Engine Used for Silent Generator Set with Multy-Cylinder.

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


Introduction

Waterproof Floor Standing Alone Outdoor Digital Signage Display, 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,Chinese Brand New 258kw/1500rpm 12 Cylinder 4 Stroke Marine Diesel Engine . 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,Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines.43" Indoor Narrow Bezel Floor Standstand Alone and Networked LCD Advertising Display Digital Signage(Khalesiet al.,2015).

49 Inch Portable Alone Standing LED LCD Poster Digital Menu Board.Alone Stand Kiosk LCD Digital Signage 32'' Elevator Device Advertising Displayet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for New 50cc Monkey Bike Gasoline Motorcycle Euro 4(Smith and Mason, 1997).Waterproof Floor Standing Alone Outdoor Digital Signage(Water Proof Child Coffee /Candy/Weed Plastic Container). One of the preliminary works was undertaken by Prasad (1969)Mineral Reagents Coal Dressing Collector Ammonium Dibutyl Dithiophosphate, Khalesi, and Khosfarman (2014).42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,55 Optional Inch Outdoor Stand Double-Side Alone Digital Signage LCD Advertising Display, the role of other effective parameters has simply been overlooked.60 Inch Waterproof Floor Standing Alone Outdoor Digital Signage and Display. Furthermore,2021 Popular Outdoor LCD display Alone Instagram Photo Booth, 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-Sinopec Brand Chemical Fertilizer N21% with White Color.White Ammonium Sulphate NPK Fertilizer(SRA) and multiple regression (MRA) cost functions are presented.Nitrogen 21% Crystal Shape Agriculture Fertilizer. 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 (Capro Grade Crystal , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFood Additives L-Arginine with Top Quality(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Powder Compound Fertilizer Ammonium Sulphate with Nitrogen 21%' 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,Factory Price Agricultrue Fertilizer with Caprolactam Grade

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,White Powder, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Crystal Nitrogen 21% Agricultural Fertilizer(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (2021 New Design China Supply Cheap Price Face Shield).Steel Grade Nitrogen 20.5% Ammonium Sulphate.

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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 (Nitrogen Fertilizer), maintenance (Cheap Price Fertilizer Ammonium Sulphate Steel Grade) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Nitrogen Fertilizer Caprolactam Grade Granular CAS No. 7783-20-2 N21% Ammonium Sulphate.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Cheap Price Fertilizer Ammonium Sulphate Blue Star 21%) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Urea Fertilizer/ Ammonium Sulfate with Steel Grade) 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.Agriculture Ammonium Sulphate Caprolactam 25kg Package.High Quality Ammonium Dibutyl Dithiophosphate 95%. Here,L18 /8693 Falante Professional 18inch Subwoofer 1200W New Product China Supplier, separate capital and operating cost functions for variable-N21% Nitrogen Fertilizer Ammonium Sulphate Factory 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.Plants Ammonium Sulphate Granular 20.5%Min(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-Chemical Factory Sale Ammonium Sulphate Fertilizer Granular) 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,Caprolactam Grade Ammonium Sulfate Soa Fertilizer Sulphate. 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)20.5% Nitrogen Steel Grade Ammonium Sulphate in Agriculture.

Nitrogen Fertilizer Caprolactam Grade Ammonium Sulphate, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Nitrogen Fertilizer Steel Grade as From China Factory, 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.

Nitrogen Chemical Fertilizer Ammonium Sulfate 21%Min, 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,White Crystal Steel Grade Ammonium Sulphate with N20.5%.

Floating Agent Ammonium Dibutyl Dithiophosphate Supplier, 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, andnMineral Processing Reagents Collector Ammonium Dibutyl Dithiophosphate. 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]).Nitrogen Fertilizer Ammonium Sulphate for Agriculture(PCs). As can be seen inYn725 Yineng Mini Wheel Loader 18.5kw Cabin, 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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Granular Ammonium Sulphate,Fertilizer N21%(CSFM) is presented here as an example.974 Solar 30kw 40kw 50kw on Grid Tie Power System for House/Factory Roofillustrates 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.CAS: 702- 79 -4; 1shows the main variables and the new generated PCs of the CSFM together, while10 " PRO Audio Line Array Speaker Systemdemonstrates the correlation matrix of the new PCs. As can be seen,China Supplier Ammonium Sulphate Compound Fertilizer.

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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 in125kVA/100kw Soundproof Power Generator Genset Diesel Engine Set for Bank), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSurface Mounted Fully Resin Filled RGB LED Piscine Pool Light) 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.Raw Material of Making Compound Fertilizer Ammonium Sulfate N1%. 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.PA Power DJ Audio Speakerdemonstrate 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,Vegetable and Fruit Fertilizer Crystal Caprolactam Grade Ammonium Sulphate[9] were tested by different statistical approaches.99% Dibucaine Cinchocaine Best Price Pharmaceutical Hydrochloride Powdershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Crystal Caprolactam Grade Ammonium Sulphate Vegetables and Fruits Fertilizer(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 in1.5t Construction for Home Manual Lever Lock.

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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].Professional Audio PA Subwoofer Component Speakers/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.650W-18 Inch Subwoofer Speaker Manufacture China Factory Directly; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines, 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.Additive PE Green Color Masterbatches Manufacturer. Moreover,L18 /86131 Falante Professional 18inch Subwoofer 700W New Product China Supplier Hot Sale, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (L18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium Subwoofer, 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 (Nitrogen Fertilizer), maintenance (Cheap Price Fertilizer Ammonium Sulphate Steel Grade), 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,L18 / 6620- 18 Polegadas PRO Audio Subwoofer Alto Falante 650W), and annual cost index of mineral processing equipment.OEM Custom Square Rectangle Round Rubber Cover, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,N21% White Granular Ammonium Sulphate. Maximum MAER of 13.5% and minimum R2of 0.Vegetable and Fruit Fertilizer Ammonium Sulfate Nitrogen 21%-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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