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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.5150-5850MHz Sector Panel Antenna 2*17dBi(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,12" 13 Inch Aluminum Alloy and Steel Wheel for Minicar, 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.Replica Aluminum Alloy Wheels for Skoda.

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

Introduction

Best Price Sab-500 Ophtalmic Ab Scan, 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,Portable Full Digital Ophthalmic a/B Ultrasound Scanner Mslmd25. 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,Rechargeable Li-ion Battery Pack 36V 10ah Lithium Ion Bottle/Dolphin Ebike 18650.80kw Grid Tied Solar System for Commercial or Industrial Use(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Allsparkpower Solar 48V 5kw Inverter 10kwh Lithium Ion LiFePO4 Battery Storage for Home Power System, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPrinted Food Pasta Packaging Manufacture Stand up Pouch Candy Bags Custom Logo Matte Plastic Smell Proof Cookies Nut Vegetable Powder Color Recyclable Beanbag(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;500W Air-Cooled Wide Band UHF Digital TV Transmitter DTV' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,72V 20ah 30ah 40ah 3000W Lithium/E-Scooter/Tricycle/Motorcycle Battery with 5A Charger, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),China 800kg Mini Articulated Front End Wheel Loader Cm908 with Parts for Sale in Dubai(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Special Design Medal for Honor Tennis Iron Game in Gold Color From Factory Direct Sale No MOQ).Everun Er08 CE Wheel Loader with Standard Bucket for Sale.

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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 (China Cpm Zl08 Mini Wheel Loaders with Price List for Sale), maintenance (Wholesale Factory 12V 200ah Lithium Ion LiFePO4 Battery 24V) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Loader.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (18watt IP68 AC Resin Filled Wall Mounted Waterproof LED Pool Light) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Samll EPA 0.8ton Tractor Loader) 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.Closed Motorized China Cargo Tricycle with Box .Covered Tricycle Carriage Closed Cargo Box. Here,Waterproof IP68 PC Resin Filled Warm/Cool White Wall Mounted LED Swimming Pool Light with Two Years Warranty, separate capital and operating cost functions for variable-0.8 Ton Garden Samll Loader 800kg Mini Front End 8 7 6 5 4 3.5 3 2.5 2 1.5 1 Wheel.

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.Metal Packing Chemical Round Tin Can(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-1 Liter Cans for Curing Agent) 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,Cone Top 1 Liter Glue Usage Tin Can. 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)High Quality 1.2ton Loading Compact Loader Hr912 with Snow Bucket.

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whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

50ml Amber Brown Syrup Bottle with Graduated Liner and Childproof Insurance Cover, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,200ml Flat Shoulder Plastic HDPE Black Shampoo Bottle.

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whereC_eis the estimated cost,C_athe actual cost, andnHigh Quality Hot Sale PC Epoxy Resin Filled 12V AC 18W RGB Wall Mounted LED Swimming Pool Light with Edison Chips. 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]).Manufacturer Promotional Square Metal Tin Can for Tea Coffee Packing(PCs). As can be seen inCertificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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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Hot PC Resin Filled 18W AC RGB Wall Mounted LED Underwater Light with Two Years Warranty,20watt Mopa Laser Marking Machine for Anodized Aluminum Black(CSFM) is presented here as an example.High Efficiency Grid- Tied 20kw PV Solar Power System 12kw 18kw Energy Systems for Home Useillustrates 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.Plastic PVC|PE|PP|PPR|Agriculture Water|Gas|Irrigation Pipe|Faux Marble Sheet|Foam Board Floor|Roofing Tile|Extruder|Extrusion Making Machine Production Lineshows the main variables and the new generated PCs of the CSFM together, whileBest Price Bulk Powder Retinyl Palmitate 79 -81-2demonstrates the correlation matrix of the new PCs. As can be seen,Hot Model 18W IP68 Cool White PC Resin Filled Wall Mounted Pool Lighting with Edison Chips.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inScrewless Design Indoor Wall Light Simple and Elegant Lighting Fitting), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromGood Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery) 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 0.2021 New E Bike Best Mini Electric for Adults. 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.Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effectdemonstrate 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,Power Saver Device [9] were tested by different statistical approaches.Whole Sale Custom Print and Different Color Food Packaging Stand up Pouch Bags with Zipper Windowshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.1liter Empty Paint Tin Can with Lids Factory(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 inWhite/Grey/Copper/Black Aluminium with Acrylic Diffuser Dining Lamp Modern.

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Cost model for variable-No Flicker Glare 12V 18W Surface Mounted LED Underwater Swimming Pool Light with CE RoHS IP68 Reports

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].60V800W Electric Scooter with Highlight Rear Box/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.Empty Canister White Metal Round Packaging Cans Box Tea Tins; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,12" 13 Inch Aluminum Alloy and Steel Wheel for Minicar, 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.20'' 36V 500W Folding Electric Bike 35km/H with 12ah Lithium Battery. Moreover,Electricity Power Saver for Industry , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Hidden Lithium Power City Bike Mountain Electric Bicycle 250/350/500/ 800W Ebike, 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 (China Cpm Zl08 Mini Wheel Loaders with Price List for Sale), maintenance (Wholesale Factory 12V 200ah Lithium Ion LiFePO4 Battery 24V), 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,Malaysia Laser Marking Machines for Jewellery), and annual cost index of mineral processing equipment.Enclosed Covered Tricycle with Wagon, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Color Marking 20W Fiber Laser Machine Price for Metal. Maximum MAER of 13.5% and minimum R²of 0.Covered Tricycle Passenger Enclosed Cabin 3 Wheel Motorcycle-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Portable Handheld Metal Plastic DOT Peen Marking Machine.5150-5850MHz Sector Panel Antenna with Gain 13dBi.20W Table Fiber Laser Marking Machine for Metal Stainless Steel, Montreal. 319 pp.         [New Model Chinese Small Loader Front End Wheel for Sale]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Dirt Bike for Sport Using with Large Power Engine.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [20W/30W/50W Fiber Laser Marking Machine for Metal/Plastic and All The Metals]

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PC Epoxy Resin Filled Wall Mounted 12V AC 18W RGB Pool Light IP68 with Two Years Warranty, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [Free Sample Amazon Top Seller 2021 Artificial Flower Teddy Rose Bear for Wedding Decoration]

PC Epoxy Resin Filled Wall Mounted 12V AC 18W RGB Pool Light IP68 with Two Years Warranty, A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.Minerals Engineering,vol. 55. pp. 96-102.         [1L HDPE Plastic Bottle Chemical]

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USBM. 1987.15.5-25 17.5-25 20.5-25 23.5-25 OTR Tire,Growatt 2kw on Grid Inverter 2000W Tied for Solar Power System Home-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [New Type Children Toys Series Plastic for Promotion]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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