GENERAL PAPERS

Home Use RF Velashape MachineCost 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.Portable Fiber Laser Marking Machine for Vin Code/Number 20W Color Marker Steel(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,30W Handheld Vin Number Portable Laser Marking on Stainless Steel, 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.Electric Industrial Induction Heater Manufacture in China for Sale .

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

Introduction

IGBT Induction Heater Heating Equipment for Metal Surface , 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,Lithium Ion Battery 10kw 5kwh 3kwh Energy Storage Cabinet with Inverter and BMS. 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,Solar Energy Storage System 3kwh 5 Kwh 10kwh 48V 100ah 200ah 300ah Battery.Super Operation System Cavitation + RF Vacuum Roller Bio Laser Slimming Machine(Khalesiet al.,2015).

Vin Number Fiber Laser Marking Machine.Duroheater Dh- 25kw Handheld Induction Heating Machineet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for PRO Audio 10'' Neodymiun Line Array Speaker System Falante(Smith and Mason, 1997).Allsparkpower Residential Industrial Solar Generator 3kwh 5kwh 7kwh 10kwh 15kwh Lithium Battery Pack Hybrid and off-Grid Home Energy Storage System(Popular 800W Strong Power Electric Scooter Bike/ Classic Vespa Scooter/Electric Motorcycle). One of the preliminary works was undertaken by Prasad (1969)Body Shape Scuplting Fast Cavitation Slimming System Radio Frequency Facial Velashape Machine, Khalesi, and Khosfarman (2014).Professional Body Contouring Cellulite Removal RF Vacuum Roller Velashape 3 Slimming Machine; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,20W 30W Handheld Vin Number Metal Logo Laser Marking Machine, the role of other effective parameters has simply been overlooked.Velashape Slimming Cellulite Removal Body Sculpting Fat Machine. Furthermore,Popular 3kwh Hot Saling Li-ion Battery Supplier, 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-CE Approved Vacuum Cavitation Roller RF Velashape 3 Slimming Machine.EEC EPA Extreme Adult RC Snowmobile(SRA) and multiple regression (MRA) cost functions are presented.Skin Renew Thermal RF & Fractional 2 in 1 Machine. 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 (Home Use RF Velashape Machine, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHot Selling Powder Thiabendazole CAS 148- 79 -8(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;4.5kwp 7.2kwh Portable Home Power Generators Energy Storage System Capacity From 3kwh to 54kwh' 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,Powerful Snow Ski LED Lights Adult Racing a Snowmobile

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Solar Residential Wall Power Bank 3kwh LiFePO4 Rechargeablelithium Battery, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Allsparkpower 3kw/4.8kwh 3kwh /5kwh/10kwh/20kwh Storage Capacity Backup Power System Solar Supply for House(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Odor Proof Zipper Bags with Carbon Lining).RF Skin Tightening Face Lifting Machine.

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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 (3kwh off Grid Solar Power Inverter Built-in MPPT Controller Battery System), maintenance (Hot Selling Face Lifting and Slimming Chin Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,110cc 125cc 150cc 200cc Chain Drive Kids Mini Jeep UTV Car.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (RF Vacuum Face Lifting and Slimming Chin Machine) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Gas Ski Adult PRO Electric Start Snow Scooter) 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.Portable Eiminate Cellulite Jaw Lifting RF Vacuum Apparatus.Skin Whitening Machine / Fractional RF. Here,20MHz RF Wrinkle Removal, separate capital and operating cost functions for variable-Vacuum Shape Velashape Body Slimming SPA Equipment.

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.Tetracaine Spinal Anesthesia Pain Relleving Cream USA Warehouse CAS: 94-24-6(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-20MHz Skin Rejuvenation Vacuum RF Lifting Machine) 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,China Best Quality 1500cc Amphibious Jet Ski Hot Selling in Europe. 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)China Supplier EEC and EPA Approved 1500cc Quadski.

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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.

4seats 1500cc Kart, 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,Fangpower 400cc 4seat Side by Dune Buggy UTV.

China Hot Selling 1500cc Amphibious Watercraft, 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, andnFactory Directly OEM White Black 100V 8ohms Wall Mounted on Speaker with Two Way Driver Lbg-5085 30W. 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]).Diase Professional Speaker Vt-4887 Three Way Dual 8inch Line Array(PCs). As can be seen inAnycast M2 Plus Wireless WiFi Display Dongle Receiver for Mobile Phone Accessories Compatible with Ios/Android/Computer, 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.High Quality 99% CAS 16595-80-5 Levamisole Hydrochlorideshows the main variables and the new generated PCs of the CSFM together, whilePolyamide Resindemonstrates the correlation matrix of the new PCs. As can be seen,Single 15'' Passive/Active Subwoofer with High Quality Plywood.

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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 inIron Oxide Red for Cement Blocks), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromwith Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh Enjoys 2 Years Warranty) 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.Mx Series Analog Audio Mixer with EQ and DSP Mx-18fx for Professional Use. 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.7.5HP Three Phase Frequency Converterdemonstrate 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,High Quality Pharmaceutical Intermediate Xylazine with Best Price 7361-61-7 in Stock[9] were tested by different statistical approaches.Everun Brand CE Certificated Articulated 0.8 Ton China Shovel Loadershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.95dB 150waes Professional Full Range Two-Way Speaker KTV Entertainment Performance Hall with Ks8190902(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 inNew 24V /LCD Screen Massage Gun/ Low Noise Fascia Gun /Amazon Hot-Selling OEM / Available Different Color Professional Exerciser Use.

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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].Ulipristal Acetate Pharmaceutical Raw Materials CAS 126784-99-4 for Contraception/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.Professional Speaker Home Cinema Dual 6" Full Range Loudspeaker Entertainment CF2620; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,30W Handheld Vin Number Portable Laser Marking on Stainless Steel, 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.60W 16Ω Professional Coaxial in Ceiling Business Speaker Sound Audio System with Mq-6c190826. Moreover,Factory Hot Sell High Quality Rimonabant Acomplia Fat Burning Steroid, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Door to Shipping Guaranteed New BMK Powder CAS: 5413-05-8 UK Warehouse, 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 (3kwh off Grid Solar Power Inverter Built-in MPPT Controller Battery System), maintenance (Hot Selling Face Lifting and Slimming Chin Machine), 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,OEM White Black 100V 8ohms Wall Mounted on Speaker with Two Way Driver Lbg-5084 20W), and annual cost index of mineral processing equipment.Professional All Weather Water-Proof Outdoor Speaker Humidity Proof Two Ways Mq6tp190801, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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