GENERAL PAPERS

Air Dirt Ash Powder Dust Remover Separator Deparator Precipitator Catcher Filter Collector for Cement SiloCost modelling for flotation machines

S. Arfania; A.R.Active Speaker with LED Display 15"500W Full Range Bluetooth H-15p0.8ton Compact Loader Wheel in Europe; 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.Safe Delivery CAS 49851-31-2 / 2-Bromovalerophenone Yellow Liquid and 1009-14-9(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,1% 98% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free, 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 0.2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7.

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

Introduction

Raw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory, 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,80%-90% Lactic Acid CAS 598-82-3 L-Lactic. 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,PRO Audio PA Speaker .Top Quality Tretinoin Powder  Retinoic Acid for Skin Care(Khalesiet al.,2015).

TCP/IP Network Poe 15W Active Wall Mount Speaker Waterproof.High Quality Skin Care Tretinoin Powder with Best Priceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for New Products Charging Case Mini Small Headphones Tws Earbuds Wireless 2021(Smith and Mason, 1997).Professional Speker System 12 Inch PA Line Array Audio S1210(Pharmaceutical Chemical Tretinoin Powder with Excllect Effect Safe Ship). One of the preliminary works was undertaken by Prasad (1969)Brazilian Spanish Market 99%Pure Lidocaine HCl Drugs USP36, Khalesi, and Khosfarman (2014).Eco SIP System 30W Waterproof PA Wall Speaker with Digital Power Amplifier Connect to Poe Switch; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Hot Selling High Quality CAS. 56-95-1 Chlorhexidine Acetate, the role of other effective parameters has simply been overlooked.Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker. Furthermore,Passive Single 12'' Line Array Loudspeaker Sound System, 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-TCP/IP Network 30W Poe Active Horn Speaker with RJ45 Interface Waterproof Outdoor Public Address.TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Use(SRA) and multiple regression (MRA) cost functions are presented.99% Proparacaine Hydrochloride / HCl CAS 5875-06-9. 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 (Professional Speaker PRO Audio System Compact Line Array PA Lq10, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inRaw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Weight Loss Raw Powder Rimonabant with Good Effects 168273-06-1' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,White Crystal or Powder Xylazine Xylazin CAS 7361-61-7 for Animal, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),professional Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Fastener Use steel wire different grade HD Saip Pasaip annealed coated phosphate).Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive.

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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 (Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9), maintenance (Low Price Malonic Acid / Propanedioic CAS 141-82-2) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (L-Arginine Nutritional Supplements  Arginine  Flavoring Agents) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Indoor DJ Stage Two Way Active Line Array Cabinet Box) 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.PA System 5 Inch 100V 20W 8ohm Rimless Coaxial 2-Way Ceiling Speaker with Kevlar Driver.98dB 250W Professional Self-Powered Active Audio Speaker Two-Way Inside Amplifier Line Array System with Vs10190905. Here,Lucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Address, separate capital and operating cost functions for variable-Glycine Methyl Ester Hydrochloride .

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.Isoquinoline-5-Sulphonyl Chloride Hydrochloride CAS 105627- 79 -0(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-Vitamin a Palmitate 1.0m) 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,High Purity 99% Oxalyl Chloride with Good Quality. 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)2-Cyclohexylethanol .

L-Pyroglutamic Acid, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !, 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.

Vitamin a Palmitate Powder 500 Cws-Gfp, 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,L-Pyroglutamic Acid.

China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price, 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, andnSupply High Purity Oxalyl Chloride CAS: 79 -37-8. 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]).Fatory Supply Thiosemicarbazide CAS 79 -19-6(PCs). As can be seen inCAS 81-48-1 Solvent Violet 13 for Dyestuff 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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High Quality 98% Tretinoin ,Selling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price(CSFM) is presented here as an example.Zl08 Wheel Loader Wl80 Wolf Miniillustrates 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.Kodi TV Box Fully Loaded Chrome Android 9.1 OS T95 Max H6 4G 32g Internet Satelliteshows the main variables and the new generated PCs of the CSFM together, whileFrequency Converter 0.5 HPdemonstrates the correlation matrix of the new PCs. As can be seen,Sugammadex Sodium CAS 343306- 79 -6 Manufacturer and Supplier.

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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 inBulk Wholesale Natural Color Round China Bamboo Incense Stick), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from15' Water-Proof Installation Long-Throw Speaker with 100V Transformer) 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.Rifamycin S 96% CAS: 13553- 79 -2. 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.Kas 12 Inch Line Array Audio Professional DJ Speakers 18 Subwooferdemonstrate 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,Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2[9] were tested by different statistical approaches.10 Inch High-Power Professional PA Subwoofer Speakershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Quality Hydroxyacetic Acid Glycolic CAS 79 -14-1 Cosmetic Grade(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 inMainframe and Large Motor.

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Cost model for variable-Outdoor PA System Three-Way Large Touring Performance Line Array Speaker

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].Plant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6/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.High Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,1% 98% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free, required air pressure, and power were considered as predictor variables simultaneously.

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Potassium 2$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.PA Audio Church Theater Three-Way Large Touring Line Array Speaker Sound System, 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%)Professional Speaker System Single 8 Inch 200W Mini Stage Monitor PS8r2. 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.Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0. Moreover,Professional Audio Speaker Active Single 8 Inch Mini Stage Monitor PS8r2, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2, 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 (Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9), maintenance (Low Price Malonic Acid / Propanedioic CAS 141-82-2), 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,Professional Speaker System Single 15 Inch High Power Line Array Aw15), and annual cost index of mineral processing equipment.PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Sinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered. Maximum MAER of 13.5% and minimum R²of 0.Hench Hot Sales Raw Material Powder Oxytetracycline-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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