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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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S. Arfania; A.R.White Ammonium Sulphate NPK FertilizerHot Sell Isopropyl Alcohol 99.9%; 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.Nitrogen 21% Crystal Shape Agriculture Fertilizer(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,Capro Grade Crystal , 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.Powder Compound Fertilizer Ammonium Sulphate with Nitrogen 21%.

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


Introduction

Powder Caprolactam Grade Chemical Fertilizer with Nitrogen 21%, 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,N21% Caprolactam Grade Ammonium Sulphate. 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,White Color Crystal Nitrogen N21% Ammonium Sulfate.China Best Price Agriculture Fertilizer with Nitrogen 21%(Khalesiet al.,2015).

Factory Price Agricultrue Fertilizer with Caprolactam Grade.White Powderet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for New Mini Willys Jeep Available on 110cc(Smith and Mason, 1997).Crystal Nitrogen 21% Agricultural Fertilizer(Trade Peak Lowest Price for 150cc ATV). One of the preliminary works was undertaken by Prasad (1969)Steel Grade Nitrogen 20.5% Ammonium Sulphate, Khalesi, and Khosfarman (2014).Nitrogen Fertilizer; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Cheap Price Fertilizer Ammonium Sulphate Steel Grade, the role of other effective parameters has simply been overlooked.Nitrogen Fertilizer Caprolactam Grade Granular CAS No. 7783-20-2 N21% Ammonium Sulphate. Furthermore,Cheap Price Fertilizer Ammonium Sulphate Blue Star 21%, 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-Urea Fertilizer/ Ammonium Sulfate with Steel Grade.Agriculture Ammonium Sulphate Caprolactam 25kg Package(SRA) and multiple regression (MRA) cost functions are presented.High Quality Ammonium Dibutyl Dithiophosphate 95%. 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 (L18 /8693 Falante Professional 18inch Subwoofer 1200W New Product China Supplier, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPublic Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;N21% Nitrogen Fertilizer Ammonium Sulphate Factory Price' 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,Nitrogen Fertilizer Caprolactam Grade Ammonium Sulphate

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Nitrogen Fertilizer Steel Grade as From China Factory, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Nitrogen Chemical Fertilizer Ammonium Sulfate 21%Min(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (New Design Women/Ladies Formal Party Evening Dress).White Crystal Steel Grade Ammonium Sulphate with N20.5%.

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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 (Floating Agent Ammonium Dibutyl Dithiophosphate Supplier), maintenance (Mineral Processing Reagents Collector Ammonium Dibutyl Dithiophosphate) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Nitrogen Fertilizer Ammonium Sulphate for Agriculture.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (China Suppllier Ammonium Sulphate 21% Nitrogen Fertilizer) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Granular Ammonium Sulphate) 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.Fertilizer N21%.China Supplier Ammonium Sulphate Compound Fertilizer. Here,Crystal Fertilizer Ammonium Sulphate for Coumpound, separate capital and operating cost functions for variable-Raw Material of Making Compound Fertilizer Ammonium Sulfate N1%.

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.Vegetable and Fruit Fertilizer Crystal Caprolactam Grade Ammonium Sulphate(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-Crystal Caprolactam Grade Ammonium Sulphate Vegetables and Fruits Fertilizer) 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,Hipower Top 10 Speakers Professional Audio PA Loudspeaker 8ohm. 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)Professional Audio PA Subwoofer Component Speakers.

650W-18 Inch Subwoofer Speaker Manufacture China Factory Directly, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Nh4 2so4 Chemical Formula for Ammonium Sulfate Fertilizer, 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.

280mm Magnet, 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,Bocinas Prosound 18 Pulgadas PRO Speaker Ruidoso Audio Subwoofer Parlente  Hot Sale.

Professional Audio PA Subwoofer Component Speakers Bocinas, 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, andnL18 /86130 100%Good Feedback! Professional 18 Inch PA Speaker 1000W RMS Subwoofer. 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]).Additive PE Green Color Masterbatches Manufacturer(PCs). As can be seen inFactory Direct High Quality Glue Round Tin Cans with Brush, 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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L18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium Subwoofer,L18 / 6620- 18 Polegadas PRO Audio Subwoofer Alto Falante 650W(CSFM) is presented here as an example.TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Useillustrates 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.Eougem Zl-08 0.8 Ton Chinese Mini Radlader Manufacturer 0.45m3 Bucket Loadershows the main variables and the new generated PCs of the CSFM together, whileWechip Customized Booting Logo Rk3318 H96 Max 4+32GB/4+64GB IPTV Set Top Box 4Kdemonstrates the correlation matrix of the new PCs. As can be seen,OEM Custom Square Rectangle Round Rubber Cover.

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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 inLkc Ltm06j Mini Final Drive to Fit Bobcat X337), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromTp01 Piezo Electric Dome Tweeter) 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.Vegetable and Fruit Fertilizer Ammonium Sulfate Nitrogen 21%. 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.Skycron® Disperse Violet 26/HFRL Dyestuff Fabric Dyedemonstrate 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,Agriculture Fertilizer N 21% Ammonium Sulfate[9] were tested by different statistical approaches.Generator Interface Module Eim Basic 258 -9753 for Fg Wilson Engineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline(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 inNew Design Fashion Jewelry 925 Sterling Silver or Brass Tortoise Earrings for Women.

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Cost model for variable-Agriculture Fertilizer Nitrogen 21% Ammonium Sulfate China Factory

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].Power Steel Grade Nitrogen 20.5% Industrial Ammonium Sulphate Chemical Fertilizer/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.White Extrusion Granular Ammonium Sulphate China Factory; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Capro Grade Crystal , required air pressure, and power were considered as predictor variables simultaneously.

Granular Grade Ammonium Sulphate N20.5% Nitrogen Fertilizer. Moreover, the operating cost was detailed in different cost items.Nitrogen Fertilizer Color Granular Ammonium Sulphate 20.5+24s, indicated inChassis/Dolphin/Powerful Speaker for Stadium, and major extrapolation should be avoided.

China Suppliers Alone Type Wraped Beam Disc Machenism Padlock$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.Dust Proof Steel Shackle Padlocks with Master Key, 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%)Padlock-G38PDP. 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.Breaker Lock. Moreover,Padlock, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Alone Type Wraped Beam Leaves Iron Padlock , 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 (Floating Agent Ammonium Dibutyl Dithiophosphate Supplier), maintenance (Mineral Processing Reagents Collector Ammonium Dibutyl Dithiophosphate), 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,Fuso Truck & Bus Turbo Td04 49377-03041 Me201258 for 4m40 Engine Mitsubishi Pajero), and annual cost index of mineral processing equipment.Gt1544s 454083-0001 1002829 Garrett Engine Turbo for Vw Passat, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Engine Parts Turbocharger for Mercedes-Benz Om906 La K27.2 Om366/Om642/Om362/Om441/Om442/Om447/Om457. Maximum MAER of 13.5% and minimum R2of 0.Gt1544sm Tdi Engine Bnm 045253019d 733783-5008s 733783-5007s Turbo-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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