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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

High Frequency Induction Heater Cost modelling for flotation machines

S. Arfania; A.R.3D Stereo Sound Mini Headphone Built in Microphone & Dual Speakers for Phone Calls5GHz Dual Pol Sector Antenna with Enclosure ; 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.New Products Charging Case Mini Small Headphones Tws Earbuds Wireless 2021(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,Transparent Nylon 12 Resin Raw Material Polyamide Granules, 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.PA12 Natural Resin Transparent Granules Pellets Polyamide Price.

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


Introduction

PA12 Plastic Granule for Injection Molding Polyamide 12 Resin Nylon, 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,PA12 Injection / Extrusion Molding Polyamide 12 Nylon Granules. 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,Nylon 12/Nylon Granules/Polyamid 12/Transparent Glasses Frame.Good Performance Virgin Transparent PA12 Granules/Pellets/Resin Equivalent with Tr90 for Glasses Frame(Khalesiet al.,2015).

Raw Material Plastic Resin Pellets Polyamide PA12 Medical Grade Transparent Nylon Granules.Hot Sales! ! Polyamide Nylon PA12 PA Plastic Granules for Injection Gradeet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 12" Line Array Loud Speaker Sound System Professional PA(Smith and Mason, 1997).2021 Hot Selling Good Performance Transparent PA12 Granules / Ployamide 12 for Commercial Installation(King Quenson Customized Label Deltamethrin 2.5 Ec China Supplier). One of the preliminary works was undertaken by Prasad (1969)Yanmar Fuel Shutdown Solenoid 1503es-12s5suc12s, Khalesi, and Khosfarman (2014).Transparent Nylon Grilamid PA -7290 Material a Kind of Amorphous PA12; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Ce Certification Plastic Water Bottle Use Yellow Masterbatch, the role of other effective parameters has simply been overlooked.Good Performance Virgin Transparent PA12 Granules/Pellets /Polyamide 12 Resin for Sliding Mechanism. Furthermore,Hot Selling PP PE Masterbatch Yellow, 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-Professional Carbon Black Masterbatch Factory for Rubbish Bag.PE Green Color Masterbatches Supplier in China(SRA) and multiple regression (MRA) cost functions are presented.Sample Free Calcium Carbonate Filler Masterbatch for Film Injection. 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 (Good Quality Food Additive Maltose Powder 69- 79 -4, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWhite Crystalline Ammonium Sulphate for Compound Fertilizer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Pharmaceutical High Purity Peptides Powder CAS No. 113- 79 -1 Argipressin Acetate' 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,Diesel Engine Parts Fuel Injection Nozzle Dlla150sm145

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,PA12 Transparent Polyamide with Anti-UV Granules, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PA12 Resin Suppliers Glass Fiberpolyamide 12 Nylon Granules(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Professional Cheapest Air Shipping /Transport Express Service China Delivery to Italy/ Spain).Diesel Engine Parts Fuel Injection Nozzle Dlla150sm105.

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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 (Grade Uns N08330 Stainless Steel Rod), maintenance (Excellent Mechanical High Transparency Transparent Nylon PA12 for Glasses) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Diesel Engine Parts Fuel Injection Nozzle Bdll150s6571.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Diesel Engine Parts Fuel Injection Nozzle 140s6655) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (PA12 Transparent Polyamide with Anti-UV Granules) 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.904L Uns N08904 SUS890L 1.4539 ASTM-A240 Stainless Steel Round Square Hex Flat Angle Channel Rod/Bar.Hot Sale Five Star Hotel Standard Soaking Oval Shaped Size Whirlpool Bathtubs Standing Alone Acrylic Bathtub #S014. Here,1.4828 S30900 309 0cr23ni13 Uns DIN JIS SUS309 Stainless Steel Round Pipe Tube, separate capital and operating cost functions for variable-Uns 2205 S32750 Hot/Cold Rolled Bright Polished Corrosion Roofing Constructions Industry Decorate Stock Ba 2b Hl 8K Stainless Steel Ss Sheets/Plates/Coils.

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.Diesel Engine Parts Fuel Injection Nozzle Dlla149sm304(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-Diesel Engine Parts Fuel Injection Nozzle Dlla150s506) 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,ASTM A276 Uns N08904 904L Stainless Steel Plate. 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)Stainless Steel 17-4pH .

Alloy Ldx 2101 Uns S32101 Stainless Steel Plate, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (ASME B36.10m Welded Stainless Steel Tube Nps 1 Sch Xxs ASTM B167 Uns N06690, 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.

Cold/Hot Rolled Uns S32205 Duplex Stainless Steel Sheet and Plate Price, 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,Uns N26055 Nickel Alloy Welding Inconel Stainless Steel Wire.

Diesel Engine Parts Fuel Injection Nozzle Dlla140s64f, 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, andnDiesel Engine Parts Fuel Injection Nozzle 149s715. 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]).Auto Feeding Inner Mounted Pipe Tube Beveling Engine(PCs). As can be seen in1L Cone Top Tin Can with Screw Cap, 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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Diesel Engine Parts Fuel Injection Nozzle 150s355A,Fuel Injectors 095000-6311 Common Rail 095000-6310 New Den Injector Re530362 Re531209 Se501925 Re546784 for John Deere 4045t(CSFM) is presented here as an example.CNG/LPG Rail Injector Type Gas 4 Cylindersillustrates 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.Stable France IPTV Server 1year Subscription French Spain Germany Italy Android TV Box Smart Mag M3u Streaming IPshows the main variables and the new generated PCs of the CSFM together, while16"X6.0" 16'x7.0' 16X8.0 16X10 Trailer Steel Rim Wheeldemonstrates the correlation matrix of the new PCs. As can be seen,Diesel Engine Parts Fuel Injection Nozzle 140sn634.

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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 inG80 Eye Sling Hook with Latch From Professional Manufacturer), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from0.8ton Agricultural Tractor Mini/Small Front Wheel Loader) 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.Diesel Engine Parts Fuel Injection Nozzle 150s364A. 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.L-Pyroglutamic Aciddemonstrate 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,Diesel Engine Parts Fuel Injection Nozzle 150s424n470[9] were tested by different statistical approaches.Rectangular Brake Oil Container Motor Engine Tin Canshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Wireless Headphone Tws Bluetooth Earphone for Phone(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 inHigh-quality fuel/water separator oil-water-separator-shell assembly for Fs19925/1397764.

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Cost model for variable-Headset Tws Wireless Earphones Mini Earbuds Stereo Headphones Bluetooth 5.0

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].Bluetooth V5.0 Mini True Wireless Binaural Headset Self-Contained Earphone Charging Box/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.L18 Tws Bluetooth V5.0 Stereo Music Earbuds Headset; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Transparent Nylon 12 Resin Raw Material Polyamide Granules, 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.American Standard Oval Freestanding Thick Rim Bath Tub Made in China. Moreover,Grey Masterbatch for Plastic Chair, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Plastic Raw Materials Black Masterbatch for PP PE Plastics, 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 (Grade Uns N08330 Stainless Steel Rod), maintenance (Excellent Mechanical High Transparency Transparent Nylon PA12 for Glasses), 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,LDPE Plastic Pellet 30% Black Pigment Color Masterbatch), and annual cost index of mineral processing equipment.Hot Melt Adhesive Film & TPU Making Machine, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Bathroom Acrylic Alone Common Bathtub with Two Side Apron . Maximum MAER of 13.5% and minimum R2of 0.Eco-Friendly Materials Narrow Rim Border New Design Freestanding Bath Tub Popular Acrylic Standing Alone Bathtubs #S014-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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