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



High Quality Argipressine CAS 113- 79 -1 with Best PriceCost modelling for flotation machines

S. Arfania; A.R.0.18mm Zebra Wooden VeneerEougem CE 1.0 Ton Hydraulic Mini Radlader Zl08; 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.Europe Popular 5kw Grid Tied Home Solar Energy System with Ce(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,High Grade Block Board for Furniture Produce, 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 0.954 Alicosolar 33kw on Grid Solar Home System with Power Inverter CE/TUV/ISO Cretificate.

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


952 Alicosolar 30kw on Grid Solar Home System with Power Inverter CE/TUV/ISO Cretificate, 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,32oz Metallic Glue Tin Can_1liter with Screw Cap and Brush. 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,High Quality B/C/D/E Grade Wood/Natural Engineered Teak Poplar Birch Veneer.Dah Solar 100kw System Price on Grid Tied Inverter for Commercial Use(Khalesiet al.,2015).

China Factory Pricing Empty Round Food Grade Nut Tin Cans.High Performance 6kw Grid Tied Home Solar Energy Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Safety Cover Full Mini Enclosed Sealed Fiber Laser UV Marking Machine Price(Smith and Mason, 1997).Oil Treatment Packaging Tin Container Can(1L Four-Color Cmyk Printing Lubricant Oil Packaging Tin Can for Car). One of the preliminary works was undertaken by Prasad (1969)Rosen 8kw Grid Tied on Solar System to Global Market, Khalesi, and Khosfarman (2014).Factory-Slicer Natural American Red Oak Veneer in 0.50mm; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Top Selling Two Person Pedal Scooters Moped Electric Motorcycle with Removable Battery, the role of other effective parameters has simply been overlooked.Custom Waterproof and Oil Sealing Round Metal Tin Can. Furthermore,CE Er08 Mini Wheel Loader with One-Year Warranty for Sale, 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-Innopack Tin Can with Brush Round Oil Cans.Alcohol/ Refrigerating Fulid Screw Top Can with Brush Wholesale(SRA) and multiple regression (MRA) cost functions are presented.2021 New Removable Battery 350W Motor Scooter Electric Motorcycle for Adult. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (3 Liter Tin Packing Chemical Can with Spout, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inwith Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Food Grade Round Tin Can for Welded Milk Powder Packaging' 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,Fluid Storage Containers Lubricants for Use

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,0.8t 800kg Small Loader, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Factory Direct High Quality Glue Round Tin Cans with Brush(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Custom Cheap Metal Printing Unicorn Key Ring for Promotion Gift).350-1500W 48-72V Smart Cheap Motorcycle for Adults Heavy Duty Electric.

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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 (Cute Street Electric Scooter with LED Light 60V800W20ah), maintenance (Lady's Smart Electric Scooter Motorcycle 60V800W20ah) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Reconstituted Composite Woven Veneer Braided.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Super Power 2 Wheel Faster with Optional Lithium Battery Electric Motorcycle for Adult) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Roof Mounting 20kw Grid Tied Solar Power System Home) 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.Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin.Wolf 0.8t Mini Loader with Grass Fork. Here,Everun Brand 0.8ton Compact Wheel Loader with 4in1 Bucket, separate capital and operating cost functions for variable-Zl08f Wheel Loader with Rops Cab.

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.2HP 1 Phase Frequency Converter(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-7.5HP Three Phase Frequency Converter) 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,3HP 1 Phase Frequency Converter. 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)3HP 1 Phase Frequency Converter.

10HP Three Phase Frequency Converter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (3HP Frequency Converter Vector Three Phase, 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.

15HP Three Phase Frequency Converter, 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,Power Smart Electric Scooter with LED Light 60V800W20ah.

3HP Three Phase Frequency Converter, 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, andn1HP Frequency Converter Vector Three Phase. 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]).15HP Frequency Converter Vector Three Phase(PCs). As can be seen in20MHz RF Wrinkle Removal, 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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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.800ml Square Metal Containersshows the main variables and the new generated PCs of the CSFM together, whileAuto Feeding Inner Mounted Pipe Tube Beveling Enginedemonstrates the correlation matrix of the new PCs. As can be seen,Hot Sale 10kw 10000W off Grid Solar Power System Home Use.

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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 inYishan 320HP hydraulic track type crawler dozer TY320C with single ripper), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHigh Quality Underwater Swimming Pool Light Decoration LED Lamp) 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 0.1.5kw 3phase Frequency Converter 50Hz to 60Hz. 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.Steel Copper Aluminum Iron DOT Peen Marking Machine with Rotarydemonstrate 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,Automaticall Switch 5kw 6kw Hybrid Solar System with Lithium Battery Backup and Tier 1 Panels[9] were tested by different statistical approaches.Diesel Engine Parts Fuel Injection Nozzle 160sn827shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Round Tin Can for Food Packaging Empty Tinplate(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 inCNC Press 260ton with Ompi Dry Clutch.

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Cost model for variable-2021 Cheap 60V 350W Cool Adult Electric Bike / Bicycle Motorcycle with Pedal

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].Pencil Cedar Veneer Medium Denstiy Fiberboards for Stairs/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.Technical Wood Veneer MDF Boards for Cupboard; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Grade Block Board for Furniture Produce, required air pressure, and power were considered as predictor variables simultaneously.

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Huihuang Bamboo Fence Timbers$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.Solar Power System Home 5kw off Grid Tied Solution, 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%)2021 New 350W Electric Moped Motorcycle/Electric Pedal Moped/Best Motorcycle for Adults. 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.Power Mini Electric Scooter for Lady 60V800W. Moreover,Dah Complete on Grid Solar System Easy Install 30kw 50kw Tied Power, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (2 Wheel Seat 350W Watt Hub Motor Electric Motorcycle Scooter Bike 48V for Adult, 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 (Cute Street Electric Scooter with LED Light 60V800W20ah), maintenance (Lady's Smart Electric Scooter Motorcycle 60V800W20ah), 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,10kw Complete Set Solar Power Systems on-Grid for Home/ Industrial/Commercial Roof), and annual cost index of mineral processing equipment.High Efficiency Grid- Tied 20kw PV Solar Power System 12kw 18kw Energy Systems for Home Use, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,0.75kw Power Frequency Converter 60Hz 50Hz. Maximum MAER of 13.5% and minimum R2of 0.Variable Frequency Inverter Solar Pump DC/AC-feasibility and even feasibility study level of projects.


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Paper received Apr. 2015
Revised paper Received Jul. 2016

2021 Best Selling 500W Electric Moped E Bike Bicycle with Pedals600W- 800W 48V/60V Lead-Acid Battery Electric ScooterCorresponding author

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