GENERAL PAPERS

Nitrogen Fertilizer Steel Grade as From China FactoryCost modelling for flotation machines

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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.TUV Certificate Gried Tied on Grid 30kw Solar Power System(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,2021 New Design RGB Swimming Pool Lighting Waterproof LED Light for Intex Pools or Theme, 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.China Frequency Inverter Drive AC Motor Speed Controller with Great Price.

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

Introduction

China Heavy Load Inverter 220V 380V Three Phase Converter DC to AC, 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,3000W Grid Tied Solar System for Home Use. 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,Factory-Full Baltic White Birch Plywood From Factory 12mm 15mm.Sapelli Plywood(Khalesiet al.,2015).

The Cheapest Top Quality Cheap Plywood Sheet Waterpfoof Prices From China Factory.Pour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouthet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Scooter Parts(Smith and Mason, 1997).Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kart(Scarlet/ Violet / Purple/ Golden/Green Pigment Paste for Printing and Dyeing). One of the preliminary works was undertaken by Prasad (1969)Electric Scooter 800W 60V20ah Lead Acid, Khalesi, and Khosfarman (2014).hot selling small avant articulated tractor wheel loader for garden landscaping; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,UV White Birch Plywood 18mm Carb E0 Cabinet, the role of other effective parameters has simply been overlooked.18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood. Furthermore,China 125cc 150cc Scooter Euro 4 Stroke Motorbike Moped EPA 49cc 50cc Electric Carburetor EEC Gas, 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-Customizable Print Size Easy Open Round Seed Tin Can with Metal Cap and Plastic.350ml Cmyk Printing Empty Motorbike Engine Flush Shooter Tin Can for Speed Gasoline Additive(SRA) and multiple regression (MRA) cost functions are presented.French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can. 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 (250ml Round Linseed Perilla Seed Oil Tin Can with 28mm Flip Top Cap, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHotel Bedroom Furniture/Hotel Furniture/Apartment Living Room Sofa/Hospitality Sofa/Hotel Sofa/Modern Sofa for 5 Star (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;SGS Food Grade Certification 500ml Tin Containers Olive 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,Chinese Eougem Zl08 Wheel Loader with Torque Converter

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Articulated Mini Wheel Loader Er08 Telescopic Boom, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Cable TV Pendoo X99 Max Rk3399 4G 32g Android 7.1 Internet Smart Box with HD Satellite Receiver(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Factory Directly Sale Bathroom Corner Message Bathtub Jacuzzi Whirlpool Bath Hot Tub).Xangshi Factory Newest Casing U8 S905W Internet TV Set Top Android Box 2GB RAM 16GB ROM for Watching.

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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 (New Design Go Kart 150cc ), maintenance (External Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,48V/60V 800W Electric Scooter with Lead-Acid Battery.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (800W 60V Lead-Acid Battery Electric Bicycle with Back Rest) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Electric Motorcycle 800W for Adult Motor) 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.Hot Sale Lady Style 60V 800W 20ah Electric Scooter with USB.800W -1000W 60V/72V Electric Scooter with Lead-Acid Battery. Here,Rosen 5kw on Grid Solar System with Tied Inverter, separate capital and operating cost functions for variable-Solar Energy System 5kw Panel Home Grid Tied Power.

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.200kw Grid Tied Solar System for Factory 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-Grid Tied Inverter 10kw 15kw 20kw Home Set Solar 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,1kw Solar Power System Grid Tied 1000W on Panel Price. 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)Commercial Solar System 100kw Grid Tied /on 100kVA 60kw.

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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.

Hot selling compact 800kgs wheel loader for garden, 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,High Efficiency 6kw Grid Tied Solar Power System for Home.

China Safe Automatic CVT 150cc Go Kart Motor with Reverse, 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, andn3 Phase VFD Vector AC Drives 1.5kw 2.2kw 4kw Variable Frequency Drive. 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]).Frequency Inverters Motor Speed Controller 3 Phase 220V Vector Control Inverter(PCs). As can be seen inUnderwater Swimming Pool Light Decoration LED Lamp, 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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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.Hy300zh-A3d 200cc 250cc 300cc Motor Trike Dry Keeping Cargo Tricycle 3 Wheel Motorcycle Adult for Dry-Goodsshows the main variables and the new generated PCs of the CSFM together, whileHidden Lithium Power City Bike Mountain Electric Bicycle 250/350/500/ 800W Ebikedemonstrates the correlation matrix of the new PCs. As can be seen,Best Quality Acrylic/PVC/Poly /PU Paper Laminated Plywood MDF From Factory.

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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 inSimple Sterling Silver Cubic Zirconia Triangle Shaped Bracelet for Engagement), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from10 " Inch Speaker System PRO Audio Entertainment Speakers ) 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.Carb P2 Okoume Plywood for Furniture. 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.Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2demonstrate 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,15mm AAA Grade Film Faced Plywood with WBP Glue[9] were tested by different statistical approaches.Mylar Laminated Ziplock Plastic Stand-up Food Packaging Bag for Nut/Gel/Food/Vitaminshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.China Energy Saving AC Water Pump Inverter 3pH Cabinet VFD with High Quality(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 in6PCS/Set FDA Reusable Cover Silicone Food Storage Lid.

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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].150CC Go Kart /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.Full Size 150cc Go Kart ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,2021 New Design RGB Swimming Pool Lighting Waterproof LED Light for Intex Pools or Theme, required air pressure, and power were considered as predictor variables simultaneously.

Go Kart . Moreover, the operating cost was detailed in different cost items.Emtpy 250L Round Clutch Brake Fluid Small Can with Plastic Lid, indicated in0.8 Ton Mini Wheel Loader with Lowest Price, and major extrapolation should be avoided.

Wolf Wl80 Mini Dumper Euro 5 Loader for Sale$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 0.0.8 Ton Chinese Low Cost High Quality Hydraulic Wheel Loader, 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%)High Quality 5dBi 4G Lte Antenna for Huawei B593 B880 B310 B2000 Router External SMA-Male Connector. 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.WLAN WiFi Yagi Antenna. Moreover,External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antenna, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (150cc Go Kart with EEC , 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 (New Design Go Kart 150cc ), maintenance (External Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router), 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,High Quality RGB Swimming Pool Lighting Waterproof LED Light with Two Years Warranty), and annual cost index of mineral processing equipment.Grid Tied 5kw Solar Energy System Home Power 5000W for Roof Tile, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality Wall Mounted Underwater LED Swimming Pool Light for Intex Pools or Theme. Maximum MAER of 13.5% and minimum R²of 0.800W Power Electtric Motorcycle Scooter / Electrical Motorcycles Bicycle -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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