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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

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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.CATV 860MHz One Way Amplifier(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,CATV Optical Receiver Module Bgo887bo Excellent Flatness 40 to 860 MHz, 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.CATV Amplifier Module Bgy887 24V 22.6db Excellent Return Loss Properties.

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


Introduction

High Efficiency SIM Card Fiber Laser Marking Machine, 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,2021 New Machine Grade CO2 Laser Marking with a Discount. 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,20W Fiber Laser Color Marking Machine for Colorful on Stainless Steel.Mopa Fiber Laser Marking Machine for Black Printing(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Sector Panel Antenna , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSkycron® Disperse Violet 1/2R 100% Fabric Dye for Polyester(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;15.5-25 17.5-25 20.5-25 23.5-25 OTR Tire' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Police Using of Motorcycle for Cruiser with Displacement 320cc(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (12W 12V 1A Power Supply AC Adapter).High Quality Cylindrical Li-ion 12V 40ah 80ah Rechargeable Lithium Battery Pack for Portable Device.

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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 (7kwh Multi-Function Solar Energy Lithium Battery Ion for Home), maintenance (5.8GHz WLAN/WiFi 0.9m Dual-Polarized Parabolic Antenna 32dBi Gain) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,45cm Offset Satellite TV Antenna with 200 Hour UV Test.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (5.8g Omni Antenna/Dual Frequency Antenna 2.4G 5.8g/2400-2500MHz Omi) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (45cm Offset Satellite Dish TV Antennas) 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.150ah Lithium Iron Phosphate .2.4-2.5GHz/5-5.8GHz Dual Frequency WiFi Antenna Internet for Things. Here,E3/L3 17.5-25 20.5-25 1800-25 Durable Tyres for Scrapers, separate capital and operating cost functions for variable-C Band Satellite TV Antenna 150cm.

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.Eougem Original Cheap Radlader 0.8ton with Standard Bucket Made in China(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-Dsola ODM/OEM Design High Efficient Mc4 Connector 3 in 1) 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).

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whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)Mc4t-Branch Connector for Parallel Solar Panel Pair Male and Female.

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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.

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whereXobsis the observed value,xethe estimated value at time/placeI,and n,High Quality 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty.

24V 40ah Lithium Iron Battery for Electric Bike, 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, andnDsola Chinese Supplier Multipurpose Mc4 Y Branch Connector. 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]).Solar Inverter 10kw 20kw Single Phase 220V off Grid Tied for Home System(PCs). As can be seen inFull Channels High-Tech Zgemma H. S Satellite TV Receiver High CPU Linux OS DVB-S One Tuner, 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.10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solventshows the main variables and the new generated PCs of the CSFM together, whileSquare Engine Oil Tin Can with Screw Cap Manufacturer Liddemonstrates the correlation matrix of the new PCs. As can be seen,Chinese Famous Brand Canmax Wheel Loader Cm908 Using Hydraulic Pump Machinery Can Be Used in Farms.

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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 inMulti-story light poultry farm steel structure with sandwich panel), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromDiesel Engine Parts Fuel Injection Nozzle 156sm420) 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.Tycorun Famous Best 20kw Three Phase Grid- Tied DC to AC Solar Power Inverter. 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.Euro 5 Gy6 -50cc 4t Mopeddemonstrate 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,Solis 10kw Grid Tied Inverter Solis-10K-4G-LV Three Phases[9] were tested by different statistical approaches.dB002e Hot Sell Electric Motorcycle 800W and Kids 500W with Ce forshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.New Pattern Design 17.5-25 20.5-25 26.5-25 off Road Tyre(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 inLaser Disco Light Stage Projector 1800MW RGB 3D Animation Wedding Party.

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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].DC 1000V Mc4 Cable Connectors /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.2021 New Design 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,CATV Optical Receiver Module Bgo887bo Excellent Flatness 40 to 860 MHz, 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.25kw engine garden/farm/ construction 0.8ton front end backhoe wheel loader. Moreover,Solis 3 Phase 10kw 12kw 15kw 20kw Grid- Tied Inverter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (China Factory Lithium 150ah Battery with BMS AC Output, 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 (7kwh Multi-Function Solar Energy Lithium Battery Ion for Home), maintenance (5.8GHz WLAN/WiFi 0.9m Dual-Polarized Parabolic Antenna 32dBi Gain), 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,Intelligent Power Saver for Industry Use), and annual cost index of mineral processing equipment.CE Approved Wolf Wl80 Zl08 Mini Wheel Loader for Farm, and over- extrapolation could result in misguiding estimates.

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Internet TV Box Linux IPTV Zgemma I55, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-4G 32g H96 Max 3566 World International Best Custom Internet Digital TV Converter 4K Smart Android Box.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Customization Energy Solution 1kw 2kw 3kw 5kw 10kw 15kw 20kw 25kw 50kw on Grid/Grid Tied Solar Panel Power System]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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