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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**

**Adult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel ScooterCost modelling for flotation machines**

**S. Arfania; A.R.Good-Tightness Square Tin Can Metal Engine Oil with Sscrew Lid****China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3; 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.800W Electric Scooter (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,Good-Sealing Square Tin Can Engine Oil with Metal Lid, 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 0.0.15mm-1.0mm Okume/ Bintangor/ Sapelli Natural Veneer From Linyi Orikey Wood.

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

**Introduction**

Special Design Braided Veneer with Red Walnut, 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,Natural Wood Bintangor Face Veneer for Door and Furniture. 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,Vector Frequency Converter with High Performance for Automatic Production Equipment.Natural Horizontal Bamboo Veneer for Panel Board(Khalesi*et al.,*2015).

Frequency Converter with SVC and Vf Control 380V 50/60Hz.Electric Motorcycle *et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for CE Approved Everun Er408 Small Farming Cheap Mini Front End Compact Wheel Loader(Smith and Mason, 1997).High-Performance Frequency Converter Three Phase 380V 50/60Hz(Wholesale 947 Ml/32oz Metal Round Glue Can Tin with Brush Cap). One of the preliminary works was undertaken by Prasad (1969)China Hot Selling 2021 Mini Electric Scooter Mobility Motorbike Wholesale, Khalesi, and Khosfarman (2014).Electric Motorcycle ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Electric Motorcycle , the role of other effective parameters has simply been overlooked.Electric Motorcycle. Furthermore,Electric Motorcycle , 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-750ml Metal Tin Can Container for Chili Oil Canning.Hot Sale Food Packaging Tin Can for Cooking Oil with Plastic Lids(SRA) and multiple regression (MRA) cost functions are presented.Metal Engine Oil Can Recycling Lubricant Tin Packaging Container. 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 (2L Galvanized Tin Cans for Cooking Oil with Plastic Lids, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inLocal Anesthetic Cinchocaine CAS85- 79 -0 for Pain Killer(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Electric Motorcycles ' 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,Professional Manufacturer Everun Er08 CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,500W EEC Electric scooter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),Electric Motorcycle (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Hwy-80 Underground Coal Mine Tunnel Crawler Extraction Mucking Magazine).Solar 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 (Wechip Customized Booting Logo Rk3318 H96 Max 4+32GB/4+64GB IPTV Set Top Box 4K), maintenance (OEM 1500W EEC Electric Scooter ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,New Arrival 4K Smart S905X2 TV Box 4+64GB X96 Mini.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (0.25mm Natural Wood Face Veneer) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2L Empty Tin Container for Engine Oil Lubricant) 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.High-Performance Three Phase Frequency Converter 380V 50/60Hz.Electric Motorcycle . Here,EEC Electric Scooter , separate capital and operating cost functions for variable-800w /1100w EEC Electric Scooter .

*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.Factory Produce Natural Face Veneer Size 1220X1830X0.25mm(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-Electric Motorcycle/Scooter/Bike ) 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,800W EEC Electric Motorcycle. 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)No Foldable 40-60km Range Per Charge EEC Electric Scooter.

1 Wheel Electric Motorcycle/One Scooter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High-Performance Frequency Converter/AC Drive 380V 50/60Hz, 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}Three Phase 380V Small Frequency Converter, 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,Hot Sale High Performance Vector Frequency Converter 380V 45/55kw.

Single/Three Phase 220V 380V Vector Control Frequency Converter, 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*Factory-Enginneered Veneer Ash in 0.30mm. 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]).Small Frequency Inverter 380V 50/60Hz(PCs). As can be seen in2.4- 5GHz Omni 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}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}*China Single Phase Variable Frequency Inverter 1.5kw*

1.2mm White Poplar Veneer From Factory for Exporting,Grid Tied Solar Panel Energy System for Home Power Generation 7kw 8kw 9kw(CSFM) is presented here as an example.Customized 18mm Carb Birch Okoumen Plywoodillustrates 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.Double Chasis Cargo Tricycleshows the main variables and the new generated PCs of the CSFM together, whileGlycine Methyl Ester Hydrochloride demonstrates the correlation matrix of the new PCs. As can be seen,Eucalyptus Core or Birch for Veneer with Grade AA.

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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 inCasein Hydrolyzed Milk Protein High Quality Food Additives CAS 9000-71-9), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromNitrogen Fertilizer Caprolactam Grade Ammonium Sulphate) 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.Popular 800W Power Electric Scooter. 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.Best Price Solar Energy Systems Home Panel System 15kw 20kw on Griddemonstrate 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,1250X2500mm Rotary Cut Okoume Veneer Cheap Prices[9] were tested by different statistical approaches.Spiral Reversible Replacement Solid Tungsten Carbide Round or Square Indexable Woodturning Cutters Inserts for Wood Turningshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Factory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader(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 inCustomized Handmade Soap Face Deep Cleaning Goats Milk Bath.

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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].Eougem CE 1.0 Ton Hydraulic Mini Radlader Zl08/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.Wolf 0.8t 800kg Mini Loader with Euro 3 Engine; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Good-Sealing Square Tin Can Engine Oil with Metal Lid, required air pressure, and power were considered as predictor variables simultaneously.

500- 800W 48V 20ah OEM manufacturers Electric Scooter. Moreover, the operating cost was detailed in different cost items.800W Brushless Adult Electric Scooter, indicated inAlloy Wheels , and major extrapolation should be avoided.

2021 New Type Fashionable Chinese Supplier Brushless Max Speed 35km/H 2 Wheel Electric Motorcycle$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.Best Chinese Big Wheel Electric Motorcycle Racing Bike Adult Bicycle, 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%)Bd600 AC Frequency Inverter/Converter/220 V to 380 Inverter. 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.1L Beer Can. Moreover,High Quality Electric Scooter Factory, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Cute Electric Scooter Motorcycle with Pedals 60V800W14ah Lithium Battery for Adults, 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 (Wechip Customized Booting Logo Rk3318 H96 Max 4+32GB/4+64GB IPTV Set Top Box 4K), maintenance (OEM 1500W EEC Electric Scooter ), 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,1L Panit Can), and annual cost index of mineral processing equipment.1L and 5L Can for Antifreezing Liquid, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},2021 Fashionable High Quality with Lithium Battery Electric Scooters EEC Vespa Citycoco Newest Model Motorcycle. Maximum MAER of 13.5% and minimum R^{2}of 0.Pump Inverter Variable Frequency Drive Manufacturers AC Supplier-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015

Revised paper Received Jul. 2016

Veterinary Use Bulk Pirce of Oxytetracycline CAS: 79 -57-2High accuracy stability Monocrystalline Silicon Pressure TransmitterCorresponding author