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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

10 " PRO Audio DJ Line Array Speaker Equipment SystemCost modelling for flotation machines

S. Arfania; A.R.Lucky Tone SIP Network 15W PA Ceiling Speaker with 24V DC Power Supply and Digital AmplifierMylar Barrier Exit Waterproof Cr Bag; 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.High Purity Amino Acid L-Arginine Powder(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,Potassium 2, 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.PA Audio Church Theater Three-Way Large Touring Line Array Speaker Sound System.

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


Introduction

Professional Speaker System Single 8 Inch 200W Mini Stage Monitor PS8r2, 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,Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0. 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,Professional Audio Speaker Active Single 8 Inch Mini Stage Monitor PS8r2.Professional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2(Khalesiet al.,2015).

Professional Speaker System Single 15 Inch High Power Line Array Aw15.PA Speaker Three-Way Large Touring Performance Line Array System PRO Audioet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Pain Killer 99% Purity Bupivacaine Hydrochloride/Bupivacaine HCl CAS 14252-80-3(Smith and Mason, 1997).Sinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered(Variable Frequency Drive VFD Supplier AC Converter 50Hz to 60Hz with Vector Control). One of the preliminary works was undertaken by Prasad (1969)Hench Hot Sales Raw Material Powder Oxytetracycline, Khalesi, and Khosfarman (2014).New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1020; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Natural Weight Loss Supplements Huperzine a Powder CAS: 120786-18-7 USA Hupa Sample Free, the role of other effective parameters has simply been overlooked.Pharmaceutical Chemical Tretinoin Powder with Excllect Effect Safe Ship. Furthermore,High-Purity Chemical Raw Materials 2-Phenylbenzimidazole Powdered Pharmaceutical Intermediates, 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-2-Aminoanthraquinone CAS No 117- 79 -3.Food Additives L-Arginine with Low Price(SRA) and multiple regression (MRA) cost functions are presented.Latest Product Powder 2-Phenylbenzimidazole Chemical Raw Material. 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 (Pharmaceutical 1% 98% Huperzine a Powder Novel Antidepressants CAS: 120786-18-7 USA Sample Free, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in500ml 16oz Round Metal Glue Tin Can with Screw Top Brush for Chemical(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Supply 1' 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,Bloom Tech Chemical Material Topiramate CAS 97240- 79 -4

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,100% Water Soluble Vitamin a Palmitate Powder Retinyl, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),China Supplier of CAS 702- 79 -4 1(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Commercial Custom Halo 3D Mini Letters Acrylic Lighted Channel Signs).Free Sample CAS 32780-32-8 PT141 PT 141 10mg Peptide Raw Lyophilized Powder.

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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 (High Quality Aod-9604 CAS 221231-10-3 Aod 9604 Peptides 2mg for Loss Weight), maintenance (CAS 79 -57-2 Oxytetracycline) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Azd3759 CAS No. 1626387-81-2.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Food Additives L-Arginine with Top Quality) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Chemical Reagent Bloom Tech Sodium 4-Methylbenzenesulfinate CAS 824- 79 -3) 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.99% Purity 1.PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac. Here,High-Purity Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol China Factory Direct Sales, separate capital and operating cost functions for variable-2-Aminoanthraquinone CAS No 117- 79 -3.

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.High Quality Tretinoin 302- 79 -4 with Good Price(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-3-Amino-4-Pyrazolecarboxamide Hemisulfate Salt CAS No 27511- 79 -1) 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,Free Sample Ortho Phthalaldehyde 643- 79 -8 with Fast Delivery Manufacture in China. 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)High Fidelity Professional Line Array Speaker .

N, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Vitamin a Palmitate CAS 79 -81-2, 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.

IP PA System 6 Inch 15W SIP Poe Ceiling Speaker with Built-in Monitoring Microphone and Dry Contact in out, 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,Best Price Diclofenac Sodium with High Quality.

40wx2 10 " Portable PS Series Party Speaker, 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, andn100% CAS 79 -57-2 Oxytetracycline Powder. 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]).New Arrival Mr Series Audio Mixer with DSP Mr-12fx(PCs). As can be seen in400 Watt Portable Music Player Speaker Professional Audio, 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.RF Vacuum Face Lifting and Slimming Chin Machineshows the main variables and the new generated PCs of the CSFM together, while10 " PRO Sound PA Line Array Loudspeaker Audio Speaker Systemdemonstrates the correlation matrix of the new PCs. As can be seen,320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetate.

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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 inCornstarch 100% Biodegradable Plastic Delivery Bags), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHigh Quality Diesel Engine Parts 4 Cyl Pump Rotor Head 096400-0371) 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.Best Quality Skin Care Pure Tretinoin 302- 79 -4. 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.1L Tin Can for Oildemonstrate 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,Factory Direct Sale Dimethyl Gonane 702- 79 -4[9] were tested by different statistical approaches.Clothes /Cosmetics Plastic Packaging PP Bags PEVA/OPP/ CPE/ Pvf Shoes Shirt Storage Stock Self Heat Sealingshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Phthalaldehyde CAS 643- 79 -8(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 inProfessional Factory Manufacturing Medical High Reputation OEM Available Oxygen Generator.

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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].CAS 79 -14-1 Glycolic Acid 70%/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.Compact Neodymium Line Array 12inch 400W Passive Speaker PA System; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Potassium 2, 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.12" Line Array Loud Speaker Sound System Professional PA. Moreover,15inch Professional Stereo Sound PA PRO Audio DJ Loud Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Line Array PA System S1210 Sound, 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 (High Quality Aod-9604 CAS 221231-10-3 Aod 9604 Peptides 2mg for Loss Weight), maintenance (CAS 79 -57-2 Oxytetracycline), 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,Cosmetic Material 99% Purity Tretinoin Powder), and annual cost index of mineral processing equipment.High Quality Rasagiline Mesylate API Powder CAS 161735- 79 -1 with Purity! !, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Spts. Maximum MAER of 13.5% and minimum R2of 0.High Power DJ Sound Equipment System Line Array PA Speaker-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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