GENERAL PAPERS

Industry Saveing Box Cost modelling for flotation machines

S. Arfania; A.R.Professional Audio Loudspeaker Vt312 Dual 12 Inch Stadium PA SpeakerSingle Phase Input and Output 220V Able 640 Static Frequency Converter 400Hz; 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.Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0(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,Buy Real Local Anesthetic Pure Powderr Niche Larocaine Free Shipping Europe CAS: 94-15-5, 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.High Purity Local Anesthetic Larocaine Powder CAS: 94-15-5 UK Hot Sales.

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

Introduction

Safe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse, 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,Free Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5. 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,Speaker Wall Mount Bracket for PRO Audio Steel 134.8L*90W*160h .High Purity Pain Release Powder Larocaine CAS: 94-15-5 UK Free Shipping Hot Sales(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Cheap Price Speaker Wall Mount Bracket , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Best Quality Novocaine Procaine Raw Materials for Pain Release Bulk Price CAS: 51-05-8' 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,Steel Wall Bracket for Speaker with Quick Release Pin

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Manufacturers Supply Top Quality High Purity Procaine Powder with Best Price CAS: 51-05-8, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),CAS No.: 67-63-0 Senior Quality Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wholesale Black Mailer Boxes Custom Printed Cardboard Sunglasses).99% Pure Powder Novocaine Procaine Factory Bulk Stock CAS: 51-05-8 Europe Free Sample.

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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 (Free Sample Local Anesthetic Novocaine Painkiller Cream Solution Procaine CAS: 51-05-8), maintenance (Pain Release Best Oral Capsules Procaine Pure Raw Materials Novocaine CAS: 51-05-8) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Tetracaine HCl CAS136-47-0.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Factory Wholesales Painkiller Solutions Free Sample Novocaine CAS: 51-05-8 Canada Procaine Promotion) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (CAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa) 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.Benzocaine CAS 94-09-7 Tetracaine HCl Lidocaine Sell 136-47-0.Melamine Molding Powder for Making Tableware Dishware China. Here,Professional Self-Powered Active Bass Speaker Subwoofer Single 18inch PA Audio System 800W Vs18s20, separate capital and operating cost functions for variable-8X4" Active Column PA Speaker.

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.Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl(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-Professional Speaker with Hanging Hardware Parts Horizontal ) 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,PA Power DJ Audio Speaker. 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)PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker.

Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (12nw76D- PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker, 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.

Double 12" 3-Way Line Array PA Speaker, 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,Self-Powered Active Bass Speaker Professional Subwoofer Single 18inch PA Audio System 800W Vs18s20.

PA Speaker Parts&Accessories Back Plate Speakon Nl4 , 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, andnProfessional Speaker PRO Audio System Three-Way Large Line Array PA Mla8312/Mla8312da. 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]).15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design Loudspeaker(PCs). As can be seen inNew Tw Audio Vera36 Dual 10 " Line Array Speaker System, 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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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.Frequency China Vector Control AC Drive Power Supply Inverter Solar Convertershows the main variables and the new generated PCs of the CSFM together, whileHigh Quality Aod-9604 CAS 221231-10-3 Aod 9604 Peptides 2mg for Loss Weightdemonstrates the correlation matrix of the new PCs. As can be seen,PA Speaker Parts of T24 12 Inch .

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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 inInsecticide Preparation), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromZhejiang Province Acrylic Standing Alone Bathtubs) 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.PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array. 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.Highly Effective Deltamethrin demonstrate 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,CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% / Isopropanol[9] were tested by different statistical approaches.High Quality 18mm Carb Birch Okoumen Plywoodshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Food Grade L Selenomethionine Powder/L-Selenomethionine(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 inCustomize Plastic Miniatures for Board Games.

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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].Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA/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.Single 15 Inch PA Full Sound Systems Professional PRO Speaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Buy Real Local Anesthetic Pure Powderr Niche Larocaine Free Shipping Europe CAS: 94-15-5, required air pressure, and power were considered as predictor variables simultaneously.

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PA Speaker Horn for Stage 180L*180W*106h 1" $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 0.6inch Bar PA Full Sound Speaker System Audio Muslims, 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%)China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8. 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.99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8. Moreover,Aluminium Back Plate for PA Speaker , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Full Range Portable Multi-Fuction Speaker Box , 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 (Free Sample Local Anesthetic Novocaine Painkiller Cream Solution Procaine CAS: 51-05-8), maintenance (Pain Release Best Oral Capsules Procaine Pure Raw Materials Novocaine CAS: 51-05-8), 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,Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance), and annual cost index of mineral processing equipment.Lidocaine Hydrochloride CAS 73-78-9 HCl, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,PA Speaker Parts . Maximum MAER of 13.5% and minimum R²of 0.Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801-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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