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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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On-line version ISSN2411-9717
Print version ISSN2225-6253

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

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

GENERAL PAPERS

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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.Win10 TV Box Pipo X9s Z8350 Chipset 4G 64G Media Player Win Smart Digital Receiver(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,Variable Speed Inverter China Frequency Converter AC, 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.Natural Material Veneer Hand Made Woven for Wall Decoration.

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


Introduction

458 Alicosolar High Efficiency 10kw on Grid Solar System Kit Home with CE/TUV/ISO for Use, 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,5kw Single Phase Home Grid Tied Solar Power System. 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,Hot Sale 15kw Grid Tied Solar Photovoltaic Power System.5kw Inverter Grid Tied Solar Power System for Home(Khalesiet al.,2015).

975 Solar 30kw 40kw on Grid Tie Power System for Factory/House Roof.Rosen 55kw Grid Tied on Solar System to Global Marketet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Ophthalmic Ultrasonic Pachymeter and Biometer(Smith and Mason, 1997).Cheap Factory Price China Supplier 1000W Adult Electric Scooters/Electric Motorcycle for Sale(Metal Tin with Steel Handle for Paint). One of the preliminary works was undertaken by Prasad (1969)Hot Cheap Electric Scooter 60V800W20ah for Adult From China, Khalesi, and Khosfarman (2014).Luxury 350W 2 Wheel Electric Bike Scooter/Electric Moped with Pedals Motorcycle Scooter; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Cheap Cute Electric Scooter with Foot Pedal 60V800W20ah From China, the role of other effective parameters has simply been overlooked.China Qingzhou Titan Zl08f 0.8ton Mini Small Garden Tractor Front End Wheel Loader. Furthermore,Three Phase 220V Frequency Converter with Vector Control, 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-China Frequency Converter Variable Speed Drive.2021 Big Promotion Product Adult 1200W Electric Bike Motorcycle Without Pedals(SRA) and multiple regression (MRA) cost functions are presented.Frequency Converter 60Hz 50Hz 200HP. 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 (Factory Price Wholesale 4oz-32oz Empty PVC Glue Tin Can with Brush, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSolar Pump Frequency Inverter MPPT Fuction 15kw Made in China(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Okoume Veneer' 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,Square Tin with Airtight Lever Lid for Tea

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Hot Sale Factory Direct Easy Open Tin Can for Food Cannery, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),968 Solar 30kw 40kw on Grid Tie Power System for Factory Roof(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Crystal White Quartz Stone Slabs Countetops/Kitchen/ Island /Peninsula for Wholesale).0.15mm Rosewood Veneer.

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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 (Interior Decorative Woven Veneer Customized Style), maintenance (4WD Wheel Loader Manufacture Small Radlader 1.0 Ton Mini780) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Farm Machinery Zl08f Mini Wheel Loader with 4 in 1 Bucket.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Yn725 Yineng Mini Wheel Loader 18.5kw Cabin) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Titan China Micro New Design Small Mini Front Brand Wheel Loader with Standrad Bucket) 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.Yn725 Yineng Mini Wheel Loader 18.5kw Cabin.Yn725 Yineng Mini Wheel Loader 18.5kw Cabin. Here,0.6mm----2mm AAA Grade White Poplar Wood Veneer for Plywood Usage, separate capital and operating cost functions for variable-Chinese Suppliers B/C/D/E Grade Wood/Natural Birch Veneer.

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.Wolf Baumaschinen Zl08 Radlader with Canopy(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-Good Quality Factory Directly Powerful E Motorcycle 2 Wheels Electric Scooters 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,Quarter Cut Ebano Makassar Chapa De Madera PARA Cocina Puerta. 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)0.25-1.0mm Hot Sale Natural Red Beech Veneer for Furniture.

Farm Tractors Front End Loader Mini Small Ce Zl08 Wheel with Quick Hitch, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Cute City Electric Scooter 600V800W14ah Lithium Battery for Adults, 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.

Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, 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,Natural Wood Veneer Oak /Cherry/Walnut MDF Board.

Zl08 0.8ton Mini Tractor Backhoe Front End Farm Wheel Loader Price List, 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, andnChinese Famous Producer Everun Supply Er408 Articulated Wheel Loader with Bucket. 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]).0.3mm Rotary Cut Red Wood Veneer(PCs). As can be seen inPortable On-Site Pipe Tube Chamfering Chamfer Machine, 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.Low Frequency Inverter AC Driveshows the main variables and the new generated PCs of the CSFM together, while6speed 20inch Wheel Aluminum Alloy Folding Mountain Bikedemonstrates the correlation matrix of the new PCs. As can be seen,Everun CE Approved 0.8 Ton Front End Loader.

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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 inCee/IEC 3p 32A 230V Different Types of Plugs and Sockets), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromFactory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader) 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 0.974 Solar 30kw 40kw 50kw on Grid Tie Power System for House/Factory Roof. 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.Good Quality Factory Directly Powerful E Motorcycle 2 Wheels Electric Scooters Bikedemonstrate 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,2-30mm Hot Sale Double Sided E0/E1 Glue Melamine/Fancy Plywood for Furniture[9] were tested by different statistical approaches.AL908 0.8ton Wheel Loader Machinery for Saleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.New Products Customized Support 1080P Decoder Box H. 265 TV with Internet Port(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 inCustomized UV Resistant Gold Color 3D Soft Sticker for Cars.

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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].Factory Product 4K Android TV Box Mxq PRO Rk3229 7.1 1GB 8GB/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.970 Solar 30kw 40kw on Grid Tie Power System for Factory Roof; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Variable Speed Inverter China Frequency Converter AC, required air pressure, and power were considered as predictor variables simultaneously.

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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.969 Solar 30kw 40kw on Grid Tie Power System for Factory Roof. Moreover,2021 Factory New Electric Bicycle Hot Sale Cool Sport Motorcycle Made in China, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Rosen 9kw Grid Tied on Solar System to Global Market, 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 (Interior Decorative Woven Veneer Customized Style), maintenance (4WD Wheel Loader Manufacture Small Radlader 1.0 Ton Mini780), 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,Frequency Converter 200HP Three Phases), and annual cost index of mineral processing equipment.Hot Sale Factory Direct Cheap New Model Electric Bicycle Convenient Motorcycle Best Price in CKD for, and over- extrapolation could result in misguiding estimates.

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USBM. 1987.Zl08 0.8t Hot Sale Small Yard Loader Mini Tractor Front End,Wl80 Mini Loader with Yanmar Engine-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Good Quality Automatic 3 Axis CNC Router Wood Carving Machine 1325 for Sale]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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