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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

GENERAL PAPERS

E1 Glue Malamine Mositure-Proof MDF with Carb CertificationCost modelling for flotation machines

S. Arfania; A.R.Gy6 /Jog Motorcycle Spare Parts Regulator/RectifierElectric Motorcycle 800W for Adult Motor; M.R. Khalesi

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.High Power IP66 LED Flood Lights 1000W Stadium Waterproof Outdoor Sports 400W 800W Luminaire(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,20MHz Medical Crf Machine Deep Wrinkle Removal Beauty Instrument, 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.Motorcycle Spare Part Turn Light for Gy6 -150.

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


Introduction

Fractional RF & Thermal Machine , 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,Motorcycle Ignition Coil Bobina Alta Tvs Star Gy6 -125 Cg125. 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,Good Price Top 20mrf Crf Wrinkle Removal Anti-Aging Device.20MHz RF Face Skin Lifting and Tightening Machine(Khalesiet al.,2015).

20MHz RF Beauty Machine Skin Tightening.Super 20MHz RF Beauty Machineet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Double 10inch Line Array System Box (Smith and Mason, 1997).20MHz RF with New Technology for Body Tightening(1000W 2 Wheel 60V 72V Mobility Scooter Electrical Motorcycle for Adult). One of the preliminary works was undertaken by Prasad (1969)Football Basketball Soccer Stadium Sport Court High Mast Lighting Aluminum Floodlight 100W 200W 300W 500W 800W Outdoor LED Flood Light, Khalesi, and Khosfarman (2014).ADSS Body Slimming Beauty Machine ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Portable Themagic Fractional RF Machine for Skin Tightening, the role of other effective parameters has simply been overlooked.China Wholesale 110/90-16 High Quality Motorcycle Tyre/Tire. Furthermore,Peonylighting 800W High Pole Stadium LED Flood Yard Lamp, 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-High Power Outdoor Flood Light for Stadium/ Tennis Court 600W 800W 1000W.Microneedle Fractional RF Thermagic Face Lift Wrinkle Removal Machine(SRA) and multiple regression (MRA) cost functions are presented.RF Microneedle Thermal Facial Lift Beauty Equipment. 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 (Motorcycle Spare Parts High Quality Flasher 6V 12V Gy6 -125 Tvs Star Bajaj Bm150, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inVitamin a Palmitate 1.0m(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Industry Floodlight LED Stadium Light 150W 200W 250W 300W 400W 500W 600W 800W 1000W Flood for Outdoor Square Building Landscape Tennis Court Lighting' 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,200cc Racing Go Kart for Sale Cheap

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,China 300cc Adult Road Legal 2 Seat Pedal Go Kart, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),3kwh Solar Energy Storage System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (LED Flexible Strips).2021 New Design 3kwh off Grid Solar Power System LiFePO4 Battery for Home Use with Built-in Inverter.

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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 (Peanut Shell and Rice Husk Continuous Carbonization Oven), maintenance (Factory Direct Wholesale 300- 17 Motorcycle Tire/Tyre) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,ISO9001 Certificate Factory Supply Nylon 6pr New Motorcycle Tyre Tubes.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Handheld Small Portable Digital High Frequency Induction Brazing Machine with Soft Cable) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Mobile Digital High Frequency Mini Induction Brazing Welder for Aluminum Tube Pipe) 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.High Quality Radio Frequency Aesthetic Equipment.China Good Quality 2.75- 17 Tubeless Motorcycle Tire/Tyre. Here,2.50- 17 , separate capital and operating cost functions for variable-Yog Motorcycle Spare Parts Magnetic Switch Assy Starter Relay for Cg125 Bros Nxr Honda Suzuki Akt 125 Akt110 Bws100 Gy6 Italika Kintaro YAMAHA Haojue.

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.Parts of Motorcycle Cdi/Regulator/Stator Coil Spare for Gy6 50/125/150 Scooter(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-Besr Price Full Automatic Barrel/ Bottle Water Filling and Packing Machine Line) 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,Medical Machine / Multipolar RF Facial Beauty. 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)Made in China High Performance Tubeless Fat Motorcycle Tire 180/55- 17.

Good Packed Bottle PE Film Shrink Wrapping Machine China, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (ISO9001 Certified Factory Price China Motorcycle Tires 2.75- 17, 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.

25kw High Frequency Induction Heater for Bolts&Rivet, 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,Fractional RF Vacuum Slimming Machine for Lose Weight.

Online Flying Laser Marking Machine for Operation Line, 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, andnComplete Automatic Plastic Bottle Pure Drinking Water Filling Bottling Packing Machine Line. 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]).Portable 20Hz RF Face Lift Machine(PCs). As can be seen inOphthalmic a Scan and Pachymeter Combined Unit, 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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DOT Certified off Road Chinese Motorcycle Tire 3.00- 17,Linear Type Thermal Film Packing Machine / Equipment(CSFM) is presented here as an example.Speaker Wall Mounting Bracket illustrates 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.Multi-Function 10 " Passive Full Range DJ Stage Speaker Systemshows the main variables and the new generated PCs of the CSFM together, whileGy6 -50cc OEM Gas Scooterdemonstrates the correlation matrix of the new PCs. As can be seen,Good Solutions 3kw Solar Home Energy off Grid System.

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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 inStrawberry Brooch for Kids), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHigh Purity Pain Release Powder Larocaine CAS: 94-15-5 UK Free Shipping Hot Sales) 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 0.25kw High Frequency Induction Heat Soldering Machine. 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.Factory Supply Disodium Hydrogen Phosphate Dodecahydrate with Best Price CAS 7558- 79 -4demonstrate 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,Super Bright Outdoor 300W 400W 500W 600W 800W 1000W LED Flood Light[9] were tested by different statistical approaches.China Jwell PVC Dual/Four Pipe High Speed Extrusion Equipment C-PVC/U-PVC/PVC-O Making Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.10pack/M Automatic PE Film Combine Heat Shrink Wrapping Bottle Packing Wrapper Machine(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 inAir Bubble Mailer Envelopes Factory Wrap Bags in White Yellow Color.

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Cost model for variable-Beverage Water Packing Equipment

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].Automatic Shrink Wrapping Machine 0-20package/Min/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.Automatic Bottle PE Film Shrink Wrapping Packing Machine ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,20MHz Medical Crf Machine Deep Wrinkle Removal Beauty Instrument, required air pressure, and power were considered as predictor variables simultaneously.

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Waterproof 800W Deformable High Mast Flood LED Lighting for Outdoor Stadium Airport Golf Course Container Wharf$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 0.1L HDPE Plastic Bottle Chemical, 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%)Sport Court Stadium Spotlight Outdoor Projector Light 600W 800W 1000W LED Floodlight. 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.Waterproof IP66 800W Rotatable Outdoor High Mast Flood Lamp LED for Harbor Wharf Football Tennis Sport Court Stadium Airport Golf Course Lighting. Moreover,Waterproof IP66 Adjustable High Power LED Stadium Lamp 100W 200W 300W 400W 600W 800W 1000W 1200W 1500W Flood Light, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality 1L 32oz Amber Glass Bottle in Stock, 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 (Peanut Shell and Rice Husk Continuous Carbonization Oven), maintenance (Factory Direct Wholesale 300- 17 Motorcycle Tire/Tyre), 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,Fast Delivery Plastic Empty Spray Bottle Lotion Pump for Hand Sanitizer 30ml- 1L), and annual cost index of mineral processing equipment.1L Stainless Steel 304 Bottle with Clamp and Silicone Gasket, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Automatic Pure/Mineral Bottle Water Packing Machine . Maximum MAER of 13.5% and minimum R2of 0.1000ml 71g 1L HDPE Plastic Bottle for Chemical Powders Liquids-feasibility and even feasibility study level of projects.

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USBM. 1987.55% Rubber Content Tyre High Performance Diagonal Motorcycle Tires 200/55- 17,DOT Certified Natural Rubber Motorcycle Tires 3.00- 17 with Golden Quality-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Love Mum Jewelry Gift Custom Engraved Charm]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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