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*On-lineÂ version*Â ISSN2411-9717

*PrintÂ version*Â ISSN2225-6253

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

#### http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

**GENERAL PAPERS**

**Best Price Medicine Grade Lanosterol PowderCost modelling for flotation machines**

**S. Arfania; A.R.Frequency Inverter 220V 50/60Hz 60HP Three Phases Acdrive****Electrical Saver Box ; 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.High-Performance Variable Frequency Inverter 3-Phase 380V(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,Wl80 Mini Loader From Wolf, 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 R^{2}, 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 R^{2}of 0.Wolf Mini Wheel Loader Wl950 Farm.

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

**Introduction**

Zl08 0.8 Ton Mini/Small Articulated Hydraulic Front End Wheel Loader, 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,Tin Cans with Metal Cover for Paint or Chemical Packaging. 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,Yihe Brand 300-600m Face/Core Veneer Door Furniture Paper Tape Reeling and Gummed for Joining Repairing.5L Chemical Oil Tinplate Can with Metal Press Cover(Khalesi*et al.,*2015).

15L Tinplate Closed Paint Bucket Water Based Glue Metal Pail.0.28mm Red Oak Artificial Veneer*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Warm White IP68 Resin Filled Wall Mounted 18watt LED Swimming Pool Light(Smith and Mason, 1997).Olive Oil Metal Container Edible Tin Can with Plastic Lid(Building Material Commercial Plywood with Carb to Europe). One of the preliminary works was undertaken by Prasad (1969)5L Engine Motor Oil Can Screw Top Rectangular Metal Tin, Khalesi, and Khosfarman (2014).Pipo X8 Win 10 + Android 4.4 Dual Boot Intel Z3736f Mini PC TV Box Wholesale Smart Set Top; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Factory Outlets 4GB 4K A95xf3 Air Android WiFi Firmware Update Amlogic S905X3 2GB Free Porm TV Box, the role of other effective parameters has simply been overlooked.New Product T95 Max+ S905X3 World 9.0 6K 4G Lte Download User Manual for Max 4K Smart Android Box TV. Furthermore,Food Grade 280ml Empty Tin Can for Camellia Oil, 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-800W Fashion Power Motorcycle Cheap Electric.Rectangular Glue Tin Can Empty Clear Paint(SRA) and multiple regression (MRA) cost functions are presented.Metal Tinplate Container Engine Oil Can with Screw Cap. 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 (Square Tin Paint Packaging Can Lubricant Oil Containers, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDiesel Engine Parts Fuel Injection Nozzle 150s355A(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;800W Electric Scooter/Motorcycle with LED Light' 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,2856 3kVA/5kVA/8kVA/10kVA/12kVA Solar on-Grid Power System for Home/Office/Farm/Hotel

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,HK1 S905W 2g 16g 7.1 Android TV Box of New Product Set Top with Low Price Kd Player 17.0, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),Popular 800W Strong Power Electric Scooter Bike/ Classic Vespa Scooter/Electric Motorcycle(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Modern Stone Acrylic Solid Surface Freestanding Bathtub Bathtubs).72V20ah Battery 800W Motor 60km Distance Range Electric Motorcycle.

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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 (800W Power and 60kms Range Per Charge Cheap Electric Motorcycle/Escooter), maintenance (Frequency Converter Special for Driving Asynchronous Motors 380V 50/60Hz) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Multi Birch Veneer Plywood Manufacturer.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Empty Round Tin Can Paint Package Container) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Factory-Engineer White Oak Veneer in 0.25mm) 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.Rectangular Brake Oil Container Motor Engine Tin Can.Customized Multi Birch Veneer Plywood Manufacturer. Here,Edible Oil Can Manufacturer Square Food Grade Metal Tin, separate capital and operating cost functions for variable-China Titanhi Zl08 800kg Compact Agricultural 0.8t Micro Pay Loader 4WD.

*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.Compact structure mini loader/wheel loader/ with 0.8ton bucket for building construction(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-CE Approved Wolf 0.8ton Bulldozer Mini Loader with Bucket) 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,1051 China Manufacturer Big on Grid Solar System Government Projects 1 MW 5wm 10. 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:

where*Y*refers to capital or operating costs,*X*defines an independent variable (one of the machine predictor variables), and*a*and*b*are constant values (parameters)800W Sine Wave Water-Proof Controller Electric Scooter/Electric Motorcycle.

Metal Tin Can Engine Oil Empty Tinplate Container, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Rosen 35kw Grid Tied on Solar System to Global Market, Khalesi, and Khosfarman, 2014).

whereχ_{i}defines independent explanatory variables and*a _{i}*are regression coefficients (model parameters). As was mentioned, independency of

*x*variables 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.

_{i}800W High Speed Electric Scooter/Bike, R^{2}, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R^{2}is 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]:

where*X _{obs}*is the observed value,

*x*the estimated value at time/place

_{e}*I,*and n,800W 60V20ah Brushless Electric Motorcycles.

10L Customized Tin Cans Paint Coating Used Metal Square Can, analysis of residuals, tests of MAER values and evaluation of R^{2}were 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).

where*C _{e}*is the estimated cost,

*C*the actual cost, and

_{a}*n*500W/ 800W / 1000W E Scooter/Electric Moped/Electric Bike. 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]).Square Engine Oil Can Metal Paint Tin Container with Plastic Lid(PCs). As can be seen inOutdoor 5GHz 30dBi Long Range Parabolic Grid Antenna, neither*X _{1}*nor

*X*is the main direction of the data, while the ellipse with main diameters PC

_{2}_{1}and PC

_{2}matches 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 and

*X*as Equations [5] and [6]:

_{i}Motorcycle Parts Ignition Key Switch Lock Gy6 Scooter

In this research, main variables of*X _{1}, X_{2}*.

*.. X*were 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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Cheap Small Electric Scooter Moped 800W Motorcycle,Frequency Converter for Small Power Motors 3pH 380V 50/60Hz(CSFM) is presented here as an example.Best Price Fertilizer Ammonium Sulphate N21% Minillustrates 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.Wholesales Plastic Food Packaging Weed Mylar Bag Aluminum Foil Resemble Ziplock Pouch Riceshows the main variables and the new generated PCs of the CSFM together, while12V AC Warm White PC Mini Flat Resin Filled LED Pool Lightdemonstrates the correlation matrix of the new PCs. As can be seen,Manufacturer of Rectangular Brake Oil Motor Engine Tin Can.

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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)

where*X _{i}*are main technical variables (like power or required air),

*a*are calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inVeneer Slicing Machine 1.5m Rotary Peeling and Cutting Combined Lathe 55m/Min Servo Motor Slicer for Plywood), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromAndroid Advertising Player 46 Inch Ultra Thin Bezel LCD Video Wall LED Backlit E Paper Display) 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.Automobile Paint Can 5L Square Tin with Metal Cap for Ink Oil. The R^{2}is about 0.94 for both cases,*i.e.*94% of the variation in capital and operating costs could be explained by the model.Single 10 Inches Passive/Active Full-Range Professional Loudspeakerdemonstrate 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,866 5kw on Grid Solar System with Power Inverter for Home[9] were tested by different statistical approaches.Insecticide Deltamethrin 2.5% Ecshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Food Grade Metal Tin Can with Printing Logo for Cooking Oil(a1, a_{2}, a_{3}) and new intercept (a_{0}) 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 inClassic Beautiful High Finish Glossy MDF Vanity Bathroom Cabin.

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*Cost model for variable-Good-Tightness Square Tin Can Metal Engine Oil with Sscrew Lid*

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].800W Electric Scooter /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.Good-Sealing Square Tin Can Engine Oil with Metal Lid; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Wl80 Mini Loader From Wolf, required air pressure, and power were considered as predictor variables simultaneously.

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Natural Wood Bintangor Face Veneer for Door and Furniture$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.Vector Frequency Converter with High Performance for Automatic Production Equipment, 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 R^{2}values 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%)Natural Horizontal Bamboo Veneer for Panel Board. 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.Frequency Converter with SVC and Vf Control 380V 50/60Hz. Moreover,Electric Motorcycle , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High-Performance Frequency Converter Three Phase 380V 50/60Hz, 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 (800W Power and 60kms Range Per Charge Cheap Electric Motorcycle/Escooter), maintenance (Frequency Converter Special for Driving Asynchronous Motors 380V 50/60Hz), 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 Hot Selling 2021 Mini Electric Scooter Mobility Motorbike Wholesale), and annual cost index of mineral processing equipment.Electric Motorcycle , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Electric Motorcycle . Maximum MAER of 13.5% and minimum R^{2}of 0.Electric Motorcycle-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015

Revised paper Received Jul. 2016

Bulk Fashion Smart Electric Scooter 60V800W20ah20MHz Skin Rejuvenation Vacuum RF Lifting MachineCorresponding author