GENERAL PAPERS

62442 Shiny and Non Phena Powder 62 44 2Cost modelling for flotation machines

S. Arfania; A.R.White Crystal or Powder Xylazine Xylazin CAS 7361-61-7 for AnimalKas 12 Inch Line Array Audio Professional DJ Speakers 18 Subwoofer; 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.professional Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816(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,Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive, 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.Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9.

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

Introduction

Low Price Malonic Acid / Propanedioic CAS 141-82-2, 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,2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker. 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,L-Arginine Nutritional Supplements  Arginine  Flavoring Agents.Indoor DJ Stage Two Way Active Line Array Cabinet Box(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (L-Pyroglutamic Acid, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good 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,Selling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Sugammadex Sodium CAS 343306- 79 -6 Manufacturer and Supplier, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Pharmaceutical 1% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Louis Armstrong New Orleans International Airport DHL Express Service Delivery From Shenzhen China to USA).Rifamycin S 96% CAS: 13553- 79 -2.

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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 (Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2), maintenance (High Quality Hydroxyacetic Acid Glycolic CAS 79 -14-1 Cosmetic Grade) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Outdoor PA System Three-Way Large Touring Performance Line Array Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Plant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2) 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.Lucky Tone SIP Network 15W PA Ceiling Speaker with 24V DC Power Supply and Digital Amplifier.High Purity Amino Acid L-Arginine Powder. Here,Potassium 2, separate capital and operating cost functions for variable-PA Audio Church Theater Three-Way Large Touring Line Array Speaker Sound System.

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

Professional Speaker System Single 15 Inch High Power Line Array Aw15, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

Sinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Hench Hot Sales Raw Material Powder Oxytetracycline.

New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1020, 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).

whereC_eis the estimated cost,C_athe actual cost, andnNatural Weight Loss Supplements Huperzine a Powder CAS: 120786-18-7 USA Hupa Sample Free. 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]).Pharmaceutical Chemical Tretinoin Powder with Excllect Effect Safe Ship(PCs). As can be seen inSkin Care Raw Material Vitamin a Palmitate Powder, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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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2-Aminoanthraquinone CAS No 117- 79 -3,Food Additives L-Arginine with Low Price(CSFM) is presented here as an example.Dual 10inch Powerful Line Array Speaker Ds210illustrates 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.Ultra Low Nosie 10 Channles Mixer Mixing Console shows the main variables and the new generated PCs of the CSFM together, whileHot Sale China Best Price of Solvent Base Liquid Polyurethane Resin for Foamdemonstrates the correlation matrix of the new PCs. As can be seen,Latest Product Powder 2-Phenylbenzimidazole Chemical Raw Material.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inWomen Fashion Knitted Sweater with Long Sleeve), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromChina High Purity Pharmaceutical Intermediate CAS 85- 79 -0 Cinchocaine with Competitive Price) 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.China Supply 1. 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.Simple Upholstered Copper Nail Vintage Style Velvet Lounge Sofademonstrate 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,China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3[9] were tested by different statistical approaches.Tx6s H616 Allwinner 4K Smart Aluminum Ott IPTV 10.0 Android TV Boxshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Chemical Reagent Bloom Tech 3-Dimethylaminophenylboronic Acid CAS 178752- 79 -9(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 inCe FDA MSDS Approved OEM Label 60ml Anti-Virus Antibacterial Alcohol Hand Wash Gel 75% Liquid Soap.

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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].Dpc Diphenyl Carbonate CAS 102-09-0/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.Bloom Tech Chemical Material Topiramate CAS 97240- 79 -4; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive, required air pressure, and power were considered as predictor variables simultaneously.

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Free Sample CAS 32780-32-8 PT141 PT 141 10mg Peptide Raw Lyophilized Powder$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.High Quality Aod-9604 CAS 221231-10-3 Aod 9604 Peptides 2mg for Loss Weight, 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%)CAS 79 -57-2 Oxytetracycline. 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.Azd3759 CAS No. 1626387-81-2. Moreover,Food Additives L-Arginine with Top Quality, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Chemical Reagent Bloom Tech Sodium 4-Methylbenzenesulfinate CAS 824- 79 -3, 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 (Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2), maintenance (High Quality Hydroxyacetic Acid Glycolic CAS 79 -14-1 Cosmetic 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,99% Purity 1), and annual cost index of mineral processing equipment.PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High-Purity Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol China Factory Direct Sales. Maximum MAER of 13.5% and minimum R²of 0.2-Aminoanthraquinone CAS No 117- 79 -3-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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