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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017



Pharmaceutical Raw Material CAS 15307- 79 -6 Diclofenac Sodium PowderCost modelling for flotation machines

S. Arfania; A.R.12inch Loudspeakers Professional Stage Outdoor Speaker Full Range Audio800W 60V Lead-Acid Battery Electric Bicycle with Back Rest; M.R. Khalesi

Tarbiat Modares University, Iran


Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Android Digital Signage Intelligent Hand Sanitizer Display(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 Inch Outdoor Double-Side LCD Display Self Service Airport Kiosk Touch Screen Multimedia Information, 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.New Brand Diesel Engine with Four Stroke Multy-Cylinder Used for Generator Set.

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


LCD Digital Signage 21.5 Inch Automatic Induction Hand Sanitizer Billboards, 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,43" Dual Screen LCD Ad Player Full HD Double Display All in One No Touch Android Advertise System. 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,Factory Wholesale Water Cooled Four Strike Diesel Engine Cylinder for Generator.10 " Woofer Speaker(Khalesiet al.,2015).

High Brightness Stand Alone Advertising Kiosk for Government.Factory Nitrogen Fertilizer Ammonium Sulphate 20.5%N Steel Grade for Agricultureet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Dsola ODM/OEM Design High Efficient Mc4 Connector 3 in 1(Smith and Mason, 1997).High Speed 258kw 6 Cylinder Industrial Diesel Engine for Electric(Frequency Inverter Pump AC Drive Price). One of the preliminary works was undertaken by Prasad (1969)21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline, Khalesi, and Khosfarman (2014).Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Water Cooled Diesel Engine Color Custom for Power Generator Set, the role of other effective parameters has simply been overlooked.Direct Injection Diesel Engine with 6-Cylinder 4-Stroke Used for Electric Generator Sets. Furthermore,Nitrogen Fertilizers Agriculture N20.5% Granular Ammonium Sulphate, 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-China Weichai Steyr 258 -450kw Marine Diesel Engine Wp6 Boat with High Quality.White Crystalline Ammonium Sulphate for Compound Fertilizer(SRA) and multiple regression (MRA) cost functions are presented.Deisel Engine for Silent Power Generator with 6-Cylinder. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (in Line Multy-Cylinder Diesel Engine for Power Generator Set, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in20dB Gain DJ Mixing Console with MP3 Input (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;6-Cylinder Diesel Engine Water Coolant for Electric Generator Set' 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,Direct Injection Water Cooled Diesel Engine for Generator Set

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Water Cooled Cylinder Diesel Engine Used for Generator Set, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Nitrogen 21% Granular Fertilizer Ammonium Sulphate(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Promotional Stonware Starbucks Coffee Mug).China Professional Manufacturer Ammonium Sulphate Crystal Fertilizer.

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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 (Best Price Fertilizer Ammonium Sulphate N21% Min), maintenance (Nitrogen Fertilizer N21% Min Ammonium Sulphate White Granular) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Wholesale Ammonium Sulphate with SGS and Coa Certificate.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Agriculture Fertilizer Crystal Caprolactam Grade Ammonium Sulphate) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Color Custom Diesel Engine Used for Generator Set with Four-Stroke) 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.Ammonium Sulphate N21% Powder+Crystal+Granular Steel+Capro.Factory Price Ammonium Sulfate for Crystal Compound Fertilizer. Here,Competitive Pice N21% Caprolactam Ammonium Sulphate Nitrogen Fertilizer, separate capital and operating cost functions for variable-Water Cooling Diesel Engine with 6-Cylinder for Power Generator.

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.258kw 6cylinder Wd Series Diesel Engine for Generator Set (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-Color Custom in-Line Diesel Engine for Generator Sets) 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,in Line Water Cooled Diesel Engine for Generator 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)Direct Injection Water Cooled Diesel Engine Used for Generator Set.

Waterproof Floor Standing Alone Outdoor Digital Signage, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Color Custom Direct Injection Diesel Engine Used for Generator Set, 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.

Water Cooled Diesel Engine Used for Electric Power Generator Set, 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,Color Custom Diesel Engine with Four-Stroke for Generator Set.

Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines, 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, andnDiesel Engine Used for Silent Generator Set with Multy-Cylinder. 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]).Waterproof Floor Standing Alone Outdoor Digital Signage Display(PCs). As can be seen in2021 New Cheap Hot Sale Adults Small Electric 800W Motorcycle with Pedals, 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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Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines,43" Indoor Narrow Bezel Floor Standstand Alone and Networked LCD Advertising Display Digital Signage(CSFM) is presented here as an example.CAS No.: 67-63-0 Isopropyl Alcohol illustrates 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.Disodium Phosphate Food Grade Manufacturershows the main variables and the new generated PCs of the CSFM together, whileChinese Zl08f Wheel Loader 0.8ton Mini with Quick Hitch for Saledemonstrates the correlation matrix of the new PCs. As can be seen,49 Inch Portable Alone Standing LED LCD Poster Digital Menu Board.

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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 inFull Color P4381 mm Indoor Curved LED Screen Wide Viewing Angle), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromRuijie Rg-Ap220-E ) 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.Waterproof Floor Standing Alone Outdoor Digital Signage. 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.Sab-500 Ophthalmic a/B Scannerdemonstrate 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,Mineral Reagents Coal Dressing Collector Ammonium Dibutyl Dithiophosphate[9] were tested by different statistical approaches.8 Ohm PRO Audio DJ Mixer Live Sound Systemshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk(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 in3ply Disposable Medical Face Mask with Meltblown Filter.

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Cost model for variable-55 Optional Inch Outdoor Stand Double-Side Alone Digital Signage LCD Advertising Display

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].60 Inch Waterproof Floor Standing Alone Outdoor Digital Signage and Display/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.


Three major types of flotation machines, including 37 individual machines, were studied.2021 Popular Outdoor LCD display Alone Instagram Photo Booth; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,55 Inch Outdoor Double-Side LCD Display Self Service Airport Kiosk Touch Screen Multimedia Information, required air pressure, and power were considered as predictor variables simultaneously.

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Nitrogen 21% Crystal Shape Agriculture Fertilizer$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.Capro Grade Crystal , 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%)Powder Compound Fertilizer Ammonium Sulphate with Nitrogen 21%. In the MRA cases, this property is owed to the SFM (3.05%).


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.Powder Caprolactam Grade Chemical Fertilizer with Nitrogen 21%. Moreover,N21% Caprolactam Grade Ammonium Sulphate, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (White Color Crystal Nitrogen N21% Ammonium Sulfate, 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 (Best Price Fertilizer Ammonium Sulphate N21% Min), maintenance (Nitrogen Fertilizer N21% Min Ammonium Sulphate White Granular), 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 Best Price Agriculture Fertilizer with Nitrogen 21%), and annual cost index of mineral processing equipment.Factory Price Agricultrue Fertilizer with Caprolactam Grade, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,White Powder. Maximum MAER of 13.5% and minimum R2of 0.Crystal Nitrogen 21% Agricultural Fertilizer-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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