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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.China Heavy Load Inverter 220V 380V Three Phase Converter DC to AC(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,3000W Grid Tied Solar System for Home Use, 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.Factory-Full Baltic White Birch Plywood From Factory 12mm 15mm.

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

Introduction

Sapelli Plywood, 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,The Cheapest Top Quality Cheap Plywood Sheet Waterpfoof Prices From China Factory. 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,Pour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouth.Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kart(Khalesiet al.,2015).

Electric Scooter 800W 60V20ah Lead Acid.hot selling small avant articulated tractor wheel loader for garden landscapinget al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 15.5-25 17.5-25 20.5-25 23.5-25 OTR Tire(Smith and Mason, 1997).UV White Birch Plywood 18mm Carb E0 Cabinet(Zl08f Construction Machine Farm Tractors Mini Compact Loaders). One of the preliminary works was undertaken by Prasad (1969)18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood, Khalesi, and Khosfarman (2014).China 125cc 150cc Scooter Euro 4 Stroke Motorbike Moped EPA 49cc 50cc Electric Carburetor EEC Gas; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Customizable Print Size Easy Open Round Seed Tin Can with Metal Cap and Plastic, the role of other effective parameters has simply been overlooked.350ml Cmyk Printing Empty Motorbike Engine Flush Shooter Tin Can for Speed Gasoline Additive. Furthermore,French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can, 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-250ml Round Linseed Perilla Seed Oil Tin Can with 28mm Flip Top Cap.SGS Food Grade Certification 500ml Tin Containers Olive Oil Can(SRA) and multiple regression (MRA) cost functions are presented.Wholesale Round Food Packaging Empty Tin Metal Cooking Oil Cans. 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 (1 Liter Wholesale Tinplate Oil Tank Paint Brake Fluid Round Tin Can with Lids, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inYn725 Yineng Mini Wheel Loader 25kw(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;2021 Everun New Design Er408 Small Front End Loader 0.8ton Mini Wheel' 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,Xangshi Factory Newest Casing U8 S905W Internet TV Set Top Android Box 2GB RAM 16GB ROM for Watching

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,New Design Go Kart 150cc , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),External Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (PVC Make up Beauty Bags).48V/60V 800W Electric Scooter with Lead-Acid Battery.

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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 (800W 60V Lead-Acid Battery Electric Bicycle with Back Rest), maintenance (Electric Motorcycle 800W for Adult Motor) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hot Sale Lady Style 60V 800W 20ah Electric Scooter with USB.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (800W -1000W 60V/72V Electric Scooter with Lead-Acid Battery) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Rosen 5kw on Grid Solar System with Tied Inverter) 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.Solar Energy System 5kw Panel Home Grid Tied Power.200kw Grid Tied Solar System for Factory Use. Here,Grid Tied Inverter 10kw 15kw 20kw Home Set Solar System, separate capital and operating cost functions for variable-1kw Solar Power System Grid Tied 1000W on Panel Price.

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.Commercial Solar System 100kw Grid Tied /on 100kVA 60kw(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-Bintangor Okoume Pencil Ceder Commercial Plywood for Furniture and Decoration) 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,Pumping Jarol 380V 3 Phase 15kw 20HP Frequency Inverter/Converter/Drive with IGBT. 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)Hot selling compact 800kgs wheel loader for garden.

High Efficiency 6kw Grid Tied Solar Power System for Home, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (China Safe Automatic CVT 150cc Go Kart Motor with Reverse, Khalesi, and Khosfarman, 2014).

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.

3 Phase VFD Vector AC Drives 1.5kw 2.2kw 4kw Variable Frequency Drive, 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,Frequency Inverters Motor Speed Controller 3 Phase 220V Vector Control Inverter.

Carb P2 Plywood/EPA Plywood /Okoume, 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).

whereC_eis the estimated cost,C_athe actual cost, andnCarb E0 Glue Cabinets Grade 18mm White Birch Plywood From China. 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]).Variable Speed Drive Phree Phase Frequency Converter 1000Hz(PCs). As can be seen inKraft Paper Bag /Stand-up Food-Packaging-Bag for Dry Food/Mylar Aluminum Foil Laminated Bio High Quality Plastic Food Packaging Hemp, 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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3 Phase VFD AC Drives 1.5kw 2.2kw 4kw Variable Frequency Drive,Carb P2 Okoume Plywood for Furniture(CSFM) is presented here as an example.1 Liter Wholesale Tinplate Oil Tank Paint Brake Fluid Round Tin Can with Lidsillustrates 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.Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !shows the main variables and the new generated PCs of the CSFM together, while0.3mm Rotary Cut Red Wood Veneerdemonstrates the correlation matrix of the new PCs. As can be seen,15mm AAA Grade Film Faced Plywood with WBP Glue.

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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 inElectric Hose Crimping Machine Automatic), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromRotary-Cut Okoume Wood Veneer 0.25mm A Grade for India) 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.Hot Sale 250ml Small Can of DOT3 Brake Oil Tinplate Packaging. 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.Natural Wood Veneer Oak /Cherry/Walnut MDF Boarddemonstrate 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,150CC Go Kart [9] were tested by different statistical approaches.Potassium 2shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Full Size 150cc Go Kart (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 inWholesale Long Sleeve T-Shirt Men's Hemp Cotton Tshirt Design Your Logos.

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Cost model for variable-Go Kart

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].Emtpy 250L Round Clutch Brake Fluid Small Can with Plastic Lid/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.Wolf Wl80 Mini Dumper Euro 5 Loader for Sale; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,3000W Grid Tied Solar System for Home Use, required air pressure, and power were considered as predictor variables simultaneously.

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WLAN WiFi Yagi Antenna$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.External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antenna, 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%)150cc Go Kart with EEC . 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.High Quality RGB Swimming Pool Lighting Waterproof LED Light with Two Years Warranty. Moreover,Grid Tied 5kw Solar Energy System Home Power 5000W for Roof Tile, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality Wall Mounted Underwater LED Swimming Pool Light for Intex Pools or Theme, 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 (800W 60V Lead-Acid Battery Electric Bicycle with Back Rest), maintenance (Electric Motorcycle 800W for Adult Motor), 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,800W Power Electtric Motorcycle Scooter / Electrical Motorcycles Bicycle ), and annual cost index of mineral processing equipment.2021 Hot Sale Wall Mounted Underwater LED Swimming Pool Light with Two Years Warranty, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality Wall Mounted Underwater LED Swimming Pool Light with Edison Chip. Maximum MAER of 13.5% and minimum R²of 0.Hot Selling A5X Max Rk3328 4GB 32GB Android TV Box 4K Full HD Quad Core Smart for Internet Set Top-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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