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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**

**China 800kg Mini Articulated Front End Wheel Loader Cm908 with Parts for Sale in DubaiCost modelling for flotation machines**

**S. Arfania; A.R.6000W Inverter Grid Tied Home Solar Energy System Without Battery****150cc China Gas Motor Cargo Trike for Sale ; 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.Solar Pump Inverter DC/ AC Supplier(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,DC/AC Frequency Inverter Solar Pump Power 400-600V Input 1.5kw, 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.Frequnce Converter AC Drive 380V 11kw.

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

**Introduction**

Solar Inverter Pump 15kw, 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,China Manufacturer 5000W Grid Tied Home Solar Energy System Low Cost. 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,TUV Ce Europe Popular 6000W Grid Tied Home Solar System.High Quality X96 Max Android 9.0 Smart 4K Set Top Set-Top 4GB 64GB Firmware Ott TV Box(Khalesi*et al.,*2015).

Yn725g Yineng Mini Front End Loader.China Everun Er408 Small Loader Compact with Pallet Forks*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Frequency Converter 60Hz 50Hz 160HP(Smith and Mason, 1997).Yn725g 18.5 Kw/2(Motor Tricycle Three Wheel Cargo Trike for Sale). One of the preliminary works was undertaken by Prasad (1969)1392 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System, Khalesi, and Khosfarman (2014).Yn725g 18.5kw Cabin Yineng Mini Wheel Loader; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Yn725g Yineng Mini Wheel Loader, the role of other effective parameters has simply been overlooked.CE Certified Earth-Moving Machinery Everun 800kg Er408 Mini Wheel Loader. Furthermore,3kw Solar Power System for Home Use on Grid, 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-Solar Energy System 5kw Panel Home Grid Tied Power 6kw 8kw 10kw.Everun Brand CE Certificated Articulated 0.8 Ton China Shovel Loader(SRA) and multiple regression (MRA) cost functions are presented.PNG Easy Install 12kw 15kw Grid Tied System with Home Delivery Service. 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 (China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 250kw, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHot Sale Popular Model 60V 800W Electric Motorcycle for India Market(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Yangtze Solar Power Grid Tied System Home 5kw 5K' 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,Metal Tin with Steel Handle for Paint

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Innopack 500ml Round Conveyor Belt Glue Tin Can with Caps, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),Manufacturer Wholesale Good Quality Empty 1lt Metal Paint Glue Tin Cans with Lever Flat Pry Lid(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (China Factory Wholesale Luxury Bathroom Cabinet Set European Black Vanity).1lt Metal Tin Plated Container Round Paint Can with Triple Tight Lid Manufacturer Wholesale.

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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 (China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 45kw), maintenance (AC Fan Frequency Inverter VFD Vector Control 3pH 18kw) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Inverter Cabinet VFD Multifuctional Frequency Inverters 55kw.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (AC Fan Frequency Inverter VFD 3pH 15kw) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (AC Fan Frequency Inverter 3pH 7.5kw) 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.Inverter Cabinet VFD Frequency.Inverter Cabinet VFD Frequency AC Drive 55kw. Here,Yn725g 18.5kw Cabin Yineng Mini Wheel Loader, separate capital and operating cost functions for variable-Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader.

*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.Grid Tied 5kw Residencial Solar Energy System Home Power 5000W Panel(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-Yangtze 100kw Grid Tied Portable Solar System Camping Component) 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,Yn725g Yineng Mini Wheel Loader. 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)Roof Mounting Solar System 10kw off Grid Tied Power.

Screw Top Metal Tin Can, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (a. S Solar Wholesale Price System Grid Tied Energy Systems 5kw Panels, 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}Best Selling! 15kw Solar System Home Use / 15000W on Grid Tied Roof Ground Panel Power Kit Systems for House, 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*Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin. 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]).5L Rectangle Metal Aluminium Chemical Paint Oil Easy Open Tin Can(PCs). As can be seen inLithium Ion Battery 10kw 5kwh 3kwh Energy Storage Cabinet with Inverter and BMS, 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]:

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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}*Yn725 Gyineng Mini Wheel Loader 18.5kw Non -Cabin*

Fast Delivery Home 5kw Solar Power Grid Tied Energy System Cheap Price,1389 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System(CSFM) is presented here as an example.China Single Phase Variable Frequency Inverter 1.5kwillustrates 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.Waterproof 800W Deformable High Mast Flood LED Lighting for Outdoor Stadium Airport Golf Course Container Wharfshows the main variables and the new generated PCs of the CSFM together, while32oz Metallic Glue Tin Can_1liter with Screw Cap and Brushdemonstrates the correlation matrix of the new PCs. As can be seen,Full HD Media Player Minix Neo N42c-4 N4200 4G 32g Internet Games Online Play Racing Windows 10 Smart Set Top Box Support Google Apk Install.

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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 in3D Car Wheel Alignment Machine Match Garage Aligner), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromDual 10 " 600W Line Array PA Professional Speaker ) 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.Complete Set 15kw Grid Tied Solar Power System. 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.T250-04 452055-5004s Turbocharger for Gemini III Enginedemonstrate 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,China Cheap Colour Optional Electric Motorcycle for Adults[9] were tested by different statistical approaches.3ton Hydraulic Hand Pallet Truck Trolley Specialshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Good Quality 2-Wheel Electric Motorcycle 500-1000W Scooter in Stock(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 inCustom Indoor Advertising Acrylic Dreaming LED Neon Sign Light Letter for Decor Home or Bar.

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*Cost model for variable-Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin*

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 Electric Mobility Scooter Motorcycle with Lights/Electric Bicycle Moped Fast Delivery/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.Hot Sale Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,DC/AC Frequency Inverter Solar Pump Power 400-600V Input 1.5kw, required air pressure, and power were considered as predictor variables simultaneously.

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Cheaper Long Range off Road Best Selling Hot China Xindazhou Products Motorcycle Electric Adult$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 0.2021 Fashion Electric Mtorcycle 2000W Motor China, 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%)Mini Dumper Wolf Wl80 Loader with CE. 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.Engine Oil Cans 4 Liter Motor Lubricating Tin Can. Moreover,Yn725 Gyineng Mini Wheel Loader, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Solar Pump Frequency Inverter MPPT Fuction 0.75kw, 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 (China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 45kw), maintenance (AC Fan Frequency Inverter VFD Vector Control 3pH 18kw), 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,Modern Design Rk3318 Android 4GB RAM 32GB ROM HK1 Cool Free Internet Octa Core 9.0 Set Top TV Box), and annual cost index of mineral processing equipment.Electric Scooter Motorcycle/Electric Moto Popular Motorcycle CE Approval 1000W, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},AC to Drive 380V Frequency Inverter 4kw. Maximum MAER of 13.5% and minimum R^{2}of 0.Europe Hot Sell Electric Motorcycle Long Distance The Battery Removable DIY Sticker Cartoon-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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