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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**

**Titan Brand Mini Small Chargeur De Roues Radlader Gommata Carregador Roda Cargador Ruedaschargeur Tracteur Traktorlader Caricatore Trattore DCost modelling for flotation machines**

**S. Arfania; A.R.Adult Electric Motorcycle with Lithium Battery China****Cinema Hall Coaxial Single 10inch Professional Surround Speaker Two-Way 250W PC1020; 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.Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery(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,Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle, 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.Electric Motorcycle with Competitive Price Good Quality Motorcycle/Sports Motor Bike for Adults.

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

**Introduction**

Solar Inverter Pump Inverters 5.5kw, 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,10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solvent. 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,350ml Brake Fluid Glue Tin Bottle.9L Tight Head Tin Can with Tap for Oilve Oil Ink and Paint(Khalesi*et al.,*2015).

Pipo X9s Latest Dual Boot Mini PC 2GB 32GB Wins 10+Android 5.1 TV Box 4K Full HD.6000W Inverter Grid Tied Home Solar Energy System Without Battery*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Gy6 -80 Motorcycle Parts Starting Motor Gear(Smith and Mason, 1997).Solar Pump Inverter DC/ AC Supplier(Cosmetic Grade CAS 79 -14-1 Glycolic Acid Powder). One of the preliminary works was undertaken by Prasad (1969)DC/AC Frequency Inverter Solar Pump Power 400-600V Input 1.5kw, Khalesi, and Khosfarman (2014).Frequnce Converter AC Drive 380V 11kw; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Solar Inverter Pump 15kw, the role of other effective parameters has simply been overlooked.China Manufacturer 5000W Grid Tied Home Solar Energy System Low Cost. Furthermore,TUV Ce Europe Popular 6000W Grid Tied Home Solar System, 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-High Quality X96 Max Android 9.0 Smart 4K Set Top Set-Top 4GB 64GB Firmware Ott TV Box.Yn725g Yineng Mini Front End Loader(SRA) and multiple regression (MRA) cost functions are presented.China Everun Er408 Small Loader Compact with Pallet Forks. 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 (Yn725g 18.5 Kw/2, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inVimode China Hot Sale E Scooter Europe Warehouse Electric Motorcycles 800W(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;1392 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System' 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,Solar Energy System 5kw Panel Home Grid Tied Power 6kw 8kw 10kw

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Everun Brand CE Certificated Articulated 0.8 Ton China Shovel Loader, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),PNG Easy Install 12kw 15kw Grid Tied System with Home Delivery Service(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Energy Saving Aluminum Housing High Lumen Outdoor LED Streetlight 50W 100W 150W 200W All in One Solar Street Light).China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 250kw.

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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 (Yangtze Solar Power Grid Tied System Home 5kw 5K), maintenance (Hot Sale and Competitive Price Electric Motorcycle Scooter for Daily) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,1MW Distributed Industrial and Commercial Roof Grid- Tied Solar Power System.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (AC Fan Frequency Inverter VFD Vector Control 3pH 30kw) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (3 Liter High Quality Customized Square Printed Tin Cans for Oil/Paint) 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.Metal Tin with Steel Handle for Paint.Innopack 500ml Round Conveyor Belt Glue Tin Can with Caps. Here,Manufacturer Wholesale Good Quality Empty 1lt Metal Paint Glue Tin Cans with Lever Flat Pry Lid, separate capital and operating cost functions for variable-1lt Metal Tin Plated Container Round Paint Can with Triple Tight Lid Manufacturer Wholesale.

*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 Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 45kw(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-AC Fan Frequency Inverter VFD Vector Control 3pH 18kw) 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,Inverter Cabinet VFD Multifuctional Frequency Inverters 55kw. 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)AC Fan Frequency Inverter VFD 3pH 15kw.

AC Fan Frequency Inverter 3pH 7.5kw, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Inverter Cabinet VFD Frequency, 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}Inverter Cabinet VFD Frequency AC Drive 55kw, 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,Yn725g 18.5kw Cabin Yineng Mini Wheel Loader.

Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader, 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*Grid Tied 5kw Residencial Solar Energy System Home Power 5000W Panel. 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]).Yangtze 100kw Grid Tied Portable Solar System Camping Component(PCs). As can be seen inCATV Mini Line Extending 2-Way Amplifer, 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}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.

_{n}*Yn725g Yineng Mini Wheel Loader*

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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.100% Copper Wire Stc Series Three Phase AC Dynamo/Generator / Alternator shows the main variables and the new generated PCs of the CSFM together, whilePlastic Grey Color Masterbatchdemonstrates the correlation matrix of the new PCs. As can be seen,a. S Solar Wholesale Price System Grid Tied Energy Systems 5kw Panels.

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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 inDC12V 10mm Width 7.2W 30LEDs /Meter SMD5050 IP33 RGB LED Strip Light for Indoor Decoration Certificate CE & RoHS), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromSafe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse) 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.Yn725g 18.5kw Cabin Yineng Mini Wheel Loader. 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.Electricity Saving Device 600amp demonstrate 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,Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader[9] were tested by different statistical approaches.Digital Display Superior 316L integrated Pressure Transducershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin(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 inThe Best Top 10 Shipping Container Agent Forwarder Handle Containers to United Kingdom..

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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].Yn725 Gyineng Mini Wheel Loader 18.5kw Non -Cabin/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.Fast Delivery Home 5kw Solar Power Grid Tied Energy System Cheap Price; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle, required air pressure, and power were considered as predictor variables simultaneously.

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6000W Single Phase Inverter Grid Tied Home Solar System$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.Complete Set 15kw Grid Tied Solar Power System, 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%)China Cheap Colour Optional Electric Motorcycle for Adults. 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.Good Quality 2-Wheel Electric Motorcycle 500-1000W Scooter in Stock. Moreover,Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (China Electric Mobility Scooter Motorcycle with Lights/Electric Bicycle Moped Fast Delivery, 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 (Yangtze Solar Power Grid Tied System Home 5kw 5K), maintenance (Hot Sale and Competitive Price Electric Motorcycle Scooter for Daily), 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,Hot Sale Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W), and annual cost index of mineral processing equipment.World IPTV M3u Subscription 1 Year for Arabic Netherlands Malta Austria Bulgaria Romania Egypt Croatia Africa 9600 Channels Smart TV Android Apple, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Factory Price Wholesale Vespa Electric Scooter Motorcycle Adult. Maximum MAER of 13.5% and minimum R^{2}of 0.Cheaper Long Range off Road Best Selling Hot China Xindazhou Products Motorcycle Electric Adult-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015

Revised paper Received Jul. 2016

2.4/ 5GHz Dual Band H-Pol Sector AntennaYinherb Supply Pharmaceutical Raw Materials CAS 977- 79 -7 Medrogestone PowderCorresponding author