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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.0.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump(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,12kw Grid Tied Complete Set Easy Installation Solar Energy System for Home Use or Industrial, 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.Grid Tied 11kw Solar Panel System Home Commercial Power Supply.

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


Introduction

5kw Grid Tied Solar Power System for Home 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,12kw Grid Tied Solar 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,Chinese Frequency AC Drive Pure Sine Wave Inverter Mini Water Pump Motor Controller.200cc/300cc Adults Racing Go Kart for Sale Ce Certificate(Khalesiet al.,2015).

Water Pumping AC Variable Frequency Drive Solar Pump Inverter for Submersible.0.4kw 0.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pumpet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Resealable Matte Black Polyethylene Doypack Food Packaging Zipper Stand up Bags(Smith and Mason, 1997).Jarol Strong Overload Capacity AC Drive Frequency Inverter (24 Channels Fixed Modulator). One of the preliminary works was undertaken by Prasad (1969)China Pumping AC Variable Frequency Drive Solar Pump Inverter for Submersible, Khalesi, and Khosfarman (2014).Sporty Electric Scooter ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,SMD3014/2835 AC/DC Underwater LED Swimming Pool Light, the role of other effective parameters has simply been overlooked.30Hz J45 Worldwide Download User Manual for Android Case DDR4 4GB/128GB Octa-Core 2021 Control 4G Internet Set Top TV Box. Furthermore,Best Selling 4X4 Farm ATV, 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-Cheap Racing Go Kart for Sale 200cc Water Cooled Zyao.Good Quality Eco-Friendly 500- 800W Electric Motorcycle with Fast Delivery(SRA) and multiple regression (MRA) cost functions are presented.Suspension Delivery Chinese 800W Electric Motorcycle Small Long Range Accessories Two Wheels. 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 (Amlogic Chipset S905X2 Quad Core Android8.1 4K Smart Internet TV Box T95q, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSugammadex Sodium CAS 343306- 79 -6 Manufacturer and Supplier(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Plywood Mdo / Hdo for Concrete Formwork Slab Form' 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,RGB/White 18W PAR56 LED Swimming Pool Light

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,PAR56 IP68 Waterproof Outdoor Underwater LED Swimming Pool Light, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PAR56 316ss 18watt LED Underwater Swimming Pool Lights with PC Niche(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Air Freight Shanghai to Pakistan by Professional Shipping Service).18W Recessed IP68 PAR56 LED swimming Pool Underwater Light.

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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 (18W RGB Underwater LED PAR56 Bulb Light for Swimming Pool Lighting), maintenance (Hot Sales ABS Surface Mounted LED Underwater Swimming Pool Light 18watt) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,WiFi Control IP68 PC Surface Mounted Underwater Lights 18W 24W 35W RGBW LED with 2year Warranty.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (The Thinnest Wall Pool Underwater Swimming Light 18 Volts) 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.Rosen 7kw Grid Tied on Solar Panel System.11kw Grid Tied Solar Energy System Industrial Power Supply. Here,Customized 18mm Carb Birch Okoumen Plywood, separate capital and operating cost functions for variable-China Plywood for The Furniture/Construction.

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.3-18mm Melamine Plywood/Melamine Board/Fancy Paper Face Plywood for Indoor Use(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-Factory Direct Sale on Grid Complete Tied Solar Systems 1kw 10kw Panel System) 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,Grid Tied Wind Solar Power System. 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)Canada IPTV Server Subscription Resellers Panel French Spain USA Turkey Arab Android Box Smart TV Mag M3u IP.

Ash Solid Wood decoration Board, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (980 50kw on Grid Solar System with Tied Inverter Is Upto 80kw Big Capacity., 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.

800ml Square Metal Containers, 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,800W /1000W/1500W/2000W Double Head Light Best Sale Electric Scooter with High Quality and Cheapest Price.

Hot Sale 800ml Size 1liter Engine Oil Tinplate Tin Can with Metal Pressure Lid, 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, andnHot Sale Metal Round Cans for Paint or Chemical Packaging. 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]).Everun CE Approved Articulated Er08 0.8 Ton Multifunction Front End Loader with Standard Bucket(PCs). As can be seen inGainsville Furniture Livingroom Sofa Set Luxury Leather GS9012, 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.Portable Automatic Ultrasound Bone Analyzer Densitometershows the main variables and the new generated PCs of the CSFM together, whileSkycron® Disperse Violet 63/RL 200% Color Dye For Clothesdemonstrates the correlation matrix of the new PCs. As can be seen,China Manufacturers Offer Cheap Price Front End Mini Shovel Loader 800 Kg.

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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 inWedding Dress), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromDual 10 Inch Line Array Speaker for Theater ) 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.Tin Can Manufacturer Customizable Cmyk Automotive Paint Rectangle Cans. 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.Engine Controller Model Eim Basic 258 -9756demonstrate 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,Titan Brand 0.8 Ton High Quality Mini Wheel Loader with and Performance.[9] were tested by different statistical approaches.Silver Truck Wheel Rims Steel 17.5 Inchshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Duty Chinese mini loader(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 inModern Coffee Shop Modified Container Modular Shipping Pop-up Bar of Hysun.

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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].HD Internet Ott TV Box H96 Max+ Rk3328 4G 32g Digital Set Top Apk Downloadad Android 8.1/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

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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.Electric Scooter/ Motorcycle/TM-BQ. Moreover,Commerical Okoume Plywood for Sale, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Go Kart , 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 (18W RGB Underwater LED PAR56 Bulb Light for Swimming Pool Lighting), maintenance (Hot Sales ABS Surface Mounted LED Underwater Swimming Pool Light 18watt), 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,New Go Kart ), and annual cost index of mineral processing equipment.Everun 0.8ton Mini Wheel Loader with Euro III Engine, and over- extrapolation could result in misguiding estimates.

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Mular, A.L. 1982.TUV Certificate Gried Tied on Grid 30kw Solar Power System.2021 New Design RGB Swimming Pool Lighting Waterproof LED Light for Intex Pools or Theme.China Frequency Inverter Drive AC Motor Speed Controller with Great Price, Montreal. 265 pp.         [Pedal E-Bike / Scooter Electric Bicycle 500W/ 800W]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.China Heavy Load Inverter 220V 380V Three Phase Converter DC to AC.3000W Grid Tied Solar System for Home Use.China Frequency Inverter Drive AC Motor Speed Controller with Great Price, Montreal. 319 pp.         [L18 / 6620- 18 Polegadas PRO Audio Subwoofer Alto Falante 650W]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Factory-Full Baltic White Birch Plywood From Factory 12mm 15mm.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [99% High Quality Nootropics Drugs Huperzine a 102518- 79 -6 Hupa USA Factory Fast Delivery]

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980 50kw on Grid Solar System with Tied Inverter Is Upto 80kw Big Capacity., A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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