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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.Cute Electric Scooter Motorcycle with Pedals 60V800W14ah Lithium Battery for Adults(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,1L Panit Can, 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 0.1L and 5L Can for Antifreezing Liquid.

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


Introduction

2021 Fashionable High Quality with Lithium Battery Electric Scooters EEC Vespa Citycoco Newest Model Motorcycle, 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,Pump Inverter Variable Frequency Drive Manufacturers AC Supplier. 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,Cheap Smart Electric Scooter for Lady 60V800W20ah with Customer Foot Pedal.Wenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados(Khalesiet al.,2015).

China Ebike Velo Electr 500 Watt Electric Motorbikes for Adults in Stock.Frequency Inverter Solar Pump Vector Air Compressor Power Transformeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio(Smith and Mason, 1997).Supply China Control Frequency Converter VFD Power Transformer Motor Drive(Cheap Street Electric Scooter Motorcycle with Bit Protect Frame 60V800W). One of the preliminary works was undertaken by Prasad (1969)MPPT Function Variable Frequency Drive Motor Controller Power Supply Generator, Khalesi, and Khosfarman (2014).0.75kw-11kw Three Phase 380V Frequency Inverter VFD; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,2885 Factory 25 Years Warranty Solar Power Kits 5kw 8kw 10kw 12kw Grid Energy System, the role of other effective parameters has simply been overlooked.2876 10kw Home Used Solar Power System on Grid Roof. Furthermore,2879 Free Shipping 10kw 12kw 15kw Home Used Solar Power System on Grid Roof, 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-AAA Grade 0.9mm Poplar Core/Veneer for Plywood/Furniture.Radiate Pine Face Veneer(SRA) and multiple regression (MRA) cost functions are presented.Grade AA Veneer Furniture Building Material Plywood to Dubai. 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 (1L Wholesale Round Tin Can for Paint/Engine Oil with Tight Lid, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in3 in 6 out Digital Signal Processors Professional Audio System Line Array PA with Dp-36(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Manufacturer of Enigine Oil Can' 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,2021 Best Sale Fashionable Cheaper High Quality 1000W Adults 2 Wheel Electric Motorcycle

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Hot Popular Fast Shipping H. 265 Standars Czech Republic Channels Internet TV Box(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (290mm Perforated Non Woven Fabric Sanitary Towel with Corlorful Wrap).Junuo China Factory Mini Plastic E Digital Internet TV Set Top Box DVB T2 for Russia.

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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 (5 Litre Extra Olive Oil Tin Can ), maintenance (DC/AC Frequency Inverter Solar Pump Power 400-600V Input 2.2kw) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Frequency Converterlow Industrial Power Inverter.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2370 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (China Electric Moped Motorcycle Sale for Adults Mobility E Scooter with Battery) 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.Three Phase 380V/ 0.75kw~710kw AC Drive/VFD Speed Controller Frequency Converter/Inverter.DC/AC Frequency Inverter Solar Pump Power 400-600V Input 4kw. Here,Low Price B/C/D/E Grade Wood/Natural Birch Veneer, separate capital and operating cost functions for variable-Hot Sale 1000W 2 Wheel Stand Electric Scooter Motor/Electric Adult Motorcycle.

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.Solar Pump Inverter Price Quality AC Drive Frequency Converter(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 Pine Wood Core Block Board with Okume Film) 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,Hot Good Bulk Quality 60V800W20ah Electric Motor Scooter for Ladies. 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)Al-Gw6 Fast Electric Motorcycle Speed 60km/H Kits.

Titan Chargeuses Cheap Small Log China Mini Digger Loader with European 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 (Chinese Factory Direct Supply Lithium Battery Electric Scooter LCD Display Motorcycle E-Scooter, 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.

Cheap Chinese Moped Scooter with Lithium Battery Rechargeable Electric Motos Motorcycle, 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,2021 Wuxi Best Selling New Type Racing Mobility Adults 2 Wheels Electric Motorcycles E Motos CKD Scooters.

Grid Tied Solar Energy System 5kw 10kw 20kw 50kw 100kw 200kw 300kw 500kw, 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, andn2021 Hot Selling Two Wheel Cheap Powerful Electric Moped Motorcycles with Pedals Chinese Supply CKD Scooter. 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]).Titan OEM New Type Qingzhou Loadefr Factory RC Avant Mini Wheel Loaders with Ce(PCs). As can be seen inBig Discount 99% Glycocyamine Supply Guanidineacetic Acid 352-97-6, 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.Veterinary Use Bulk Pirce of Oxytetracycline CAS: 79 -57-2shows the main variables and the new generated PCs of the CSFM together, whileHigh accuracy stability Monocrystalline Silicon Pressure Transmitterdemonstrates the correlation matrix of the new PCs. As can be seen,Fast Delivery 2 Wheel Lithium Battery Electric Bike Lady Bicycle Motorcycle in Stock.

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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 inISO Certificate China Economic Prefabricated Light Steel Frame Warehouse), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromPharmaceutical Intermediate 1) 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.Everun Er408 800kg Construction Equipment Compact Mini Wheel Loader with Bucket. 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.Mobile Digital High Frequency Mini Induction Brazing Welder for Aluminum Tube Pipedemonstrate 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,Agricultural Machine Small Wheel Loader Mini780 with CE Certificate[9] were tested by different statistical approaches.962 Complete Solar System 40kw on Grid Home with High Qualityshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Cheap Price Zl08 0.8ton China Mini Articulated Hydraulic Front End Tractor Loaders(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 inSteer Drive Trailer Radial Truck Tire TBR.

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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 Price Zl08 Mini Articulated Hydraulic Front End Farm Wheel Loader/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.Factory Supply OEM Support Mxq PRO Rockchip Rk3229 Android 7.1 TV Box; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,1L Panit Can, required air pressure, and power were considered as predictor variables simultaneously.

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Dyed Natural Wood Veneer Oak Crown Cut for Hotel Decoration Shop Wall Kitchen Cabinet$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 0.15mm Pine Wood Core Block Board for Construction, 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 R2values 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%)The New Natural Mahogany Okoume Veneer. 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.Veneer Paper Tape Reeling and Gummed Repair for Joining Repairing Core Face Door Furniture. Moreover,982 High Efficiency up to 99% on Grid Solar System 50kw Plants for Large Scale Commercial, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (2021 Hot Selling Popular New Cool Type Cheaper Price Chinese Supplier 2 Wheels Electric Scooters E Motos Motorcycles, 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 (5 Litre Extra Olive Oil Tin Can ), maintenance (DC/AC Frequency Inverter Solar Pump Power 400-600V Input 2.2kw), 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,Windows Mini PC Pipo X10 PRO Z8350 Chipset Smart TV Box Android 5.1 4G RAM 64G ROM), and annual cost index of mineral processing equipment.5 Liter Paint Tin Can with Customized Printing Plastic Handle, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,2 Liter Square Small Metal Tin Can for Paint with Handle and Lid. Maximum MAER of 13.5% and minimum R2of 0.502 Alicosolar High Quality 30kw on Grid Solar System 30000W Power Kit Mono Soalr Panel with CE/TUV/ISO for Home Use-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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