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


2021 New Cheap Hot Sale Adults Small Electric 800W Motorcycle with PedalsCost modelling for flotation machines

S. Arfania; A.R.High Speed 258kw 6 Cylinder Industrial Diesel Engine for ElectricAC Drive Output and Triple Frequency Converter 60 Hz 50 Power Supply; 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.21% Fertilizer Ammonium Sulphate Caprolactam Grade Crystalline(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,Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%, 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.Water Cooled Diesel Engine Color Custom for Power Generator Set.

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


Direct Injection Diesel Engine with 6-Cylinder 4-Stroke Used for Electric Generator Sets, 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,Nitrogen Fertilizers Agriculture N20.5% Granular Ammonium Sulphate. 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,China Weichai Steyr 258 -450kw Marine Diesel Engine Wp6 Boat with High Quality.White Crystalline Ammonium Sulphate for Compound Fertilizer(Khalesiet al.,2015).

Deisel Engine for Silent Power Generator with Line Multy-Cylinder Diesel Engine for Power Generator Setet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Hot Selling 800W Brushless Motor Electric Scooter Motorcycle(Smith and Mason, 1997).6-Cylinder Diesel Engine Water Coolant for Electric Generator Set(CAS No.: 67-63-0 Isopropyl Alcohol ). One of the preliminary works was undertaken by Prasad (1969)in Line Direct Injection Diesel Engine Used for Generator Set, Khalesi, and Khosfarman (2014).Color Custom Diesel Engine with Four-Stroke for Gensets; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,6-Cylinder Diesel Engine with Four-Strke for Silent Generator Set, the role of other effective parameters has simply been overlooked.Diesel Engine with Four-Stroke Used for Cylinder Generator Set. Furthermore,Direct Injection Water Cooled Diesel Engine for Generator Set, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Water Cooled Cylinder Diesel Engine Used for Generator Set.Nitrogen 21% Granular Fertilizer Ammonium Sulphate(SRA) and multiple regression (MRA) cost functions are presented.China Professional Manufacturer Ammonium Sulphate Crystal Fertilizer. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Best Price Fertilizer Ammonium Sulphate N21% Min, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDisodium Phosphate Food Grade Manufacturer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Nitrogen Fertilizer N21% Min Ammonium Sulphate White Granular' 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,Factory Price Ammonium Sulfate for Crystal Compound Fertilizer

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

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Water Cooling Diesel Engine with 6-Cylinder for Power Generator(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (5.5kw with Hongda Engine Concrete Power Trowel).258kw 6cylinder Wd Series Diesel Engine for Generator Set .

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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 (Color Custom in-Line Diesel Engine for Generator Sets), maintenance (in Line Water Cooled Diesel Engine for Generator with Good Quality) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Direct Injection Water Cooled Diesel Engine Used for Generator Set.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Waterproof Floor Standing Alone Outdoor Digital Signage) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Color Custom Direct Injection Diesel Engine Used for Generator Set) 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.Water Cooled Diesel Engine Used for Electric Power Generator Set.Color Custom Diesel Engine with Four-Stroke for Generator Set. Here,Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines, separate capital and operating cost functions for variable-Diesel Engine Used for Silent Generator Set with Multy-Cylinder.

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.Waterproof Floor Standing Alone Outdoor Digital Signage Display(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-Chinese Brand New 258kw/1500rpm 12 Cylinder 4 Stroke Marine Diesel Engine ) 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,Hot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines. 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)43" Indoor Narrow Bezel Floor Standstand Alone and Networked LCD Advertising Display Digital Signage.

49 Inch Portable Alone Standing LED LCD Poster Digital Menu Board, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Alone Stand Kiosk LCD Digital Signage 32'' Elevator Device Advertising Display, 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.

Waterproof Floor Standing Alone Outdoor Digital Signage, 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,Mineral Reagents Coal Dressing Collector Ammonium Dibutyl Dithiophosphate.

42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk, 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, andn55 Optional Inch Outdoor Stand Double-Side Alone Digital Signage LCD Advertising Display. 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]).60 Inch Waterproof Floor Standing Alone Outdoor Digital Signage and Display(PCs). As can be seen inCheap Smart Lady's Electric Scooter 60V800W, 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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Sinopec Brand Chemical Fertilizer N21% with White Color,White Ammonium Sulphate NPK Fertilizer(CSFM) is presented here as an example.Ruijie Rg-Ap220-E 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.5GHz Dish Parabolic Antenna 29dBishows the main variables and the new generated PCs of the CSFM together, whileSab-500 Ophthalmic a/B Scannerdemonstrates the correlation matrix of the new PCs. As can be seen,Nitrogen 21% Crystal Shape Agriculture Fertilizer.

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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 inChina Factory Direct Losing Weight Raw Sarms Sr9011), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromNew Professional Coaxial Line Array Column Speaker 20PCS Driver Unit PA System with L16-Ci) 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.Powder Compound Fertilizer Ammonium Sulphate with Nitrogen 21%. 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.China Best Pest Control Insecticide Deltamethrin 5% Ec Supplier Neocidoldemonstrate 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,Powder Caprolactam Grade Chemical Fertilizer with Nitrogen 21%[9] were tested by different statistical approaches.1 Wheel Electric Motorcycle/One Scootershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.N21% Caprolactam Grade Ammonium Sulphate(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 inDyestuff Sulphur Dyes Sky Blue CV 120% Granule for Textile.

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Cost model for variable-White Color Crystal Nitrogen N21% Ammonium Sulfate

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].China Best Price Agriculture Fertilizer with Nitrogen 21%/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.Factory Price Agricultrue Fertilizer with Caprolactam Grade; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%, required air pressure, and power were considered as predictor variables simultaneously.

White Powder. Moreover, the operating cost was detailed in different cost items.Crystal Nitrogen 21% Agricultural Fertilizer, indicated inBurma Teak Floor Toplayer Wood Veneer Lamellas for Engineered Flooring, and major extrapolation should be avoided.

Steel Grade Nitrogen 20.5% Ammonium Sulphate$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.Nitrogen Fertilizer, 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%)Cheap Price Fertilizer Ammonium Sulphate Steel Grade. 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.Nitrogen Fertilizer Caprolactam Grade Granular CAS No. 7783-20-2 N21% Ammonium Sulphate. Moreover,Cheap Price Fertilizer Ammonium Sulphate Blue Star 21%, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Urea Fertilizer/ Ammonium Sulfate with Steel Grade, 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 (Color Custom in-Line Diesel Engine for Generator Sets), maintenance (in Line Water Cooled Diesel Engine for Generator with Good Quality), 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,Agriculture Ammonium Sulphate Caprolactam 25kg Package), and annual cost index of mineral processing equipment.High Quality Ammonium Dibutyl Dithiophosphate 95%, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,L18 /8693 Falante Professional 18inch Subwoofer 1200W New Product China Supplier. Maximum MAER of 13.5% and minimum R2of 0.N21% Nitrogen Fertilizer Ammonium Sulphate Factory Price-feasibility and even feasibility study level of projects.


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Paper received Apr. 2015
Revised paper Received Jul. 2016

CAS16830-15-2 Gotu Kola Extract Centella Asiatica Powder Cosmetic Ingredient Asiaticoside3 Phase VFD Vector AC Drives 1.5kw 2.2kw 4kw Variable Frequency DriveCorresponding author

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