GENERAL PAPERS

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S. Arfania; A.R.Mineral Reagents Coal Dressing Collector Ammonium Dibutyl DithiophosphateReliable Producer Everun Supply Er08 CE Approved 2021 Hot Sale Compact Mini Wheel Loader with Bucket; 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.42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk(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,55 Optional Inch Outdoor Stand Double-Side Alone Digital Signage LCD Advertising Display, 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 0.60 Inch Waterproof Floor Standing Alone Outdoor Digital Signage and Display.

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

Introduction

2021 Popular Outdoor LCD display Alone Instagram Photo Booth, 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,Sinopec Brand Chemical Fertilizer N21% with White Color. 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,White Ammonium Sulphate NPK Fertilizer.Nitrogen 21% Crystal Shape Agriculture Fertilizer(Khalesiet al.,2015).

Capro Grade Crystal .Powder Compound Fertilizer Ammonium Sulphate with Nitrogen 21%et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Pain Relleving Patch Topical Lidocaine Spray137-58-6 UK Warehouse Free Sample(Smith and Mason, 1997).Powder Caprolactam Grade Chemical Fertilizer with Nitrogen 21%(New Mini Willys Jeep Available on 110cc). One of the preliminary works was undertaken by Prasad (1969)N21% Caprolactam Grade Ammonium Sulphate, Khalesi, and Khosfarman (2014).White Color Crystal Nitrogen N21% Ammonium Sulfate; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,China Best Price Agriculture Fertilizer with Nitrogen 21%, the role of other effective parameters has simply been overlooked.Factory Price Agricultrue Fertilizer with Caprolactam Grade. Furthermore,White Powder, 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-Crystal Nitrogen 21% Agricultural Fertilizer.Steel Grade Nitrogen 20.5% Ammonium Sulphate(SRA) and multiple regression (MRA) cost functions are presented.Nitrogen Fertilizer. 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 (Cheap Price Fertilizer Ammonium Sulphate Steel Grade, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSupply Alcohol Soluble Polyamide Resin for Ink(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Nitrogen Fertilizer Caprolactam Grade Granular CAS No. 7783-20-2 N21% Ammonium Sulphate' 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,L18 /8693 Falante Professional 18inch Subwoofer 1200W New Product China Supplier

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,N21% Nitrogen Fertilizer Ammonium Sulphate Factory Price, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Plants Ammonium Sulphate Granular 20.5%Min(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Calacatta Polished Surfaces Engineered Quartz Stone Slab with NSF SGS Certification for Counter-Top).Chemical Factory Sale Ammonium Sulphate Fertilizer Granular.

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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 (Caprolactam Grade Ammonium Sulfate Soa Fertilizer Sulphate), maintenance (20.5% Nitrogen Steel Grade Ammonium Sulphate in Agriculture) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Nitrogen Fertilizer Caprolactam Grade Ammonium Sulphate.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Nitrogen Fertilizer Steel Grade as From China Factory) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Nitrogen Chemical Fertilizer Ammonium Sulfate 21%Min) 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.White Crystal Steel Grade Ammonium Sulphate with N20.5%.Floating Agent Ammonium Dibutyl Dithiophosphate Supplier. Here,Mineral Processing Reagents Collector Ammonium Dibutyl Dithiophosphate, separate capital and operating cost functions for variable-Nitrogen Fertilizer Ammonium Sulphate for Agriculture.

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.China Suppllier Ammonium Sulphate 21% Nitrogen Fertilizer(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-Granular Ammonium Sulphate) 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,Fertilizer N21%. 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)China Supplier Ammonium Sulphate Compound Fertilizer.

Crystal Fertilizer Ammonium Sulphate for Coumpound, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Raw Material of Making Compound Fertilizer Ammonium Sulfate N1%, 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.

Vegetable and Fruit Fertilizer Crystal Caprolactam Grade Ammonium Sulphate, 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,Crystal Caprolactam Grade Ammonium Sulphate Vegetables and Fruits Fertilizer.

Hipower Top 10 Speakers Professional Audio PA Loudspeaker 8ohm, 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 Audio PA Subwoofer Component Speakers. 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]).650W-18 Inch Subwoofer Speaker Manufacture China Factory Directly(PCs). As can be seen inTrade Peak Lowest Price for 150cc ATV, 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.Factory Direct High Quality Glue Round Tin Cans with Brushshows the main variables and the new generated PCs of the CSFM together, whileCheapest Set Top Box Mxq PRO Rk3229 Android 7.1 Quad Core 1GB 8GB TVdemonstrates the correlation matrix of the new PCs. As can be seen,Professional Audio PA Subwoofer Component Speakers Bocinas.

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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 inWholesale Nail Product Glitter Gel UV Polish), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromWechip Customized Booting Logo Rk3318 H96 Max 4+32GB/4+64GB IPTV Set Top Box 4K) 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.Additive PE Green Color Masterbatches Manufacturer. 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.Manual Water Pump Controller with Great Price AC Trifsico Solar Inverter Fan Motordemonstrate 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,L18 /86131 Falante Professional 18inch Subwoofer 700W New Product China Supplier Hot Sale[9] were tested by different statistical approaches.Tp01 Piezo Electric Dome Tweetershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.L18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium Subwoofer(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 inOcitytimes Good Taste Energy 800 Puffs Disposable Electronic Cigarette.

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Cost model for variable-L18 / 6620- 18 Polegadas PRO Audio Subwoofer Alto Falante 650W

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].OEM Custom Square Rectangle Round Rubber Cover/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.N21% White Granular Ammonium Sulphate; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,55 Optional Inch Outdoor Stand Double-Side Alone Digital Signage LCD Advertising Display, required air pressure, and power were considered as predictor variables simultaneously.

Vegetable and Fruit Fertilizer Ammonium Sulfate Nitrogen 21%. Moreover, the operating cost was detailed in different cost items.Agriculture Fertilizer N 21% Ammonium Sulfate, indicated inGenerator Interface Module Eim Basic 258 -9753 for Fg Wilson Engine, and major extrapolation should be avoided.

21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline$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.Agriculture Fertilizer Nitrogen 21% Ammonium Sulfate China Factory, 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%)Power Steel Grade Nitrogen 20.5% Industrial Ammonium Sulphate Chemical Fertilizer. 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.White Extrusion Granular Ammonium Sulphate China Factory. Moreover,Granular Grade Ammonium Sulphate N20.5% Nitrogen Fertilizer, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Nitrogen Fertilizer Color Granular Ammonium Sulphate 20.5+24s, 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 (Caprolactam Grade Ammonium Sulfate Soa Fertilizer Sulphate), maintenance (20.5% Nitrogen Steel Grade Ammonium Sulphate in Agriculture), 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,China Suppliers Alone Type Wraped Beam Disc Machenism Padlock), and annual cost index of mineral processing equipment.Dust Proof Steel Shackle Padlocks with Master Key, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Padlock-G38PDP. Maximum MAER of 13.5% and minimum R²of 0.Breaker Lock-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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