GENERAL PAPERS

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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.200cc Racing Go Kart for Sale Cheap(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,China 300cc Adult Road Legal 2 Seat Pedal Go Kart, 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 0.3kwh Solar Energy Storage System.

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

Introduction

2021 New Design 3kwh off Grid Solar Power System LiFePO4 Battery for Home Use with Built-in Inverter, 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,Peanut Shell and Rice Husk Continuous Carbonization Oven. 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 Direct Wholesale 300- 17 Motorcycle Tire/Tyre.ISO9001 Certificate Factory Supply Nylon 6pr New Motorcycle Tyre Tubes(Khalesiet al.,2015).

Handheld Small Portable Digital High Frequency Induction Brazing Machine with Soft Cable.Mobile Digital High Frequency Mini Induction Brazing Welder for Aluminum Tube Pipeet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Jwell Pet Plastic 75 Parallel Twin Screw Recycling Making Extrusion Machine Used for Cosmetic Packing with Factory Price and High Efficient(Smith and Mason, 1997).High Quality Radio Frequency Aesthetic Equipment(Factory Supply Disodium Hydrogen Phosphate Dodecahydrate with Best Price CAS 7558- 79 -4). One of the preliminary works was undertaken by Prasad (1969)China Good Quality 2.75- 17 Tubeless Motorcycle Tire/Tyre, Khalesi, and Khosfarman (2014).2.50- 17 ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Yog Motorcycle Spare Parts Magnetic Switch Assy Starter Relay for Cg125 Bros Nxr Honda Suzuki Akt 125 Akt110 Bws100 Gy6 Italika Kintaro YAMAHA Haojue, the role of other effective parameters has simply been overlooked.Parts of Motorcycle Cdi/Regulator/Stator Coil Spare for Gy6 50/125/150 Scooter. Furthermore,Besr Price Full Automatic Barrel/ Bottle Water Filling and Packing Machine Line, 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-Medical Machine / Multipolar RF Facial Beauty.Made in China High Performance Tubeless Fat Motorcycle Tire 180/55- 17(SRA) and multiple regression (MRA) cost functions are presented.Good Packed Bottle PE Film Shrink Wrapping Machine China. 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 (ISO9001 Certified Factory Price China Motorcycle Tires 2.75- 17, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina Jwell PVC Dual/Four Pipe High Speed Extrusion Equipment C-PVC/U-PVC/PVC-O Making Machine(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;25kw High Frequency Induction Heater for Bolts&Rivet' 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,ISO9001 Motorcycle Spare Part Tubeless Motorcross Tire Size 100/90- 17

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,DOT Certified off Road Chinese Motorcycle Tire 3.00- 17, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Linear Type Thermal Film Packing Machine / Equipment(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (12oz/14oz/ 10oz Wide Ceramic Coffee Cup with Printing/Logo Wholesale).Good Solutions 3kw Solar Home Energy off Grid System.

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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 (Jalyn Motorcycle Spare Parts Speedometer Assy Fits for Gy6 /Hunter), maintenance (25kw High Frequency Induction Heat Soldering Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Super Bright Outdoor 300W 400W 500W 600W 800W 1000W LED Flood Light.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (10pack/M Automatic PE Film Combine Heat Shrink Wrapping Bottle Packing Wrapper Machine) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Beverage Water Packing Equipment ) 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.Automatic Shrink Wrapping Machine 0-20package/Min.Automatic Bottle PE Film Shrink Wrapping Packing Machine . Here,Photovoltatic 1000V Solar Distribution Box PV Array 24 String DC Combiner AC Switching, separate capital and operating cost functions for variable-IP65 Waterproof High Lumen Outdoor Flood Light for Tennis Court/ Soccer Field/ Stadium 400W 600W 800W.

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.Waterproof 800W Deformable High Mast Flood LED Lighting for Outdoor Stadium Airport Golf Course Container Wharf(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-1L HDPE Plastic Bottle Chemical) 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,Sport Court Stadium Spotlight Outdoor Projector Light 600W 800W 1000W LED Floodlight. 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)Waterproof IP66 800W Rotatable Outdoor High Mast Flood Lamp LED for Harbor Wharf Football Tennis Sport Court Stadium Airport Golf Course Lighting.

Waterproof IP66 Adjustable High Power LED Stadium Lamp 100W 200W 300W 400W 600W 800W 1000W 1200W 1500W Flood Light, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Quality 1L 32oz Amber Glass Bottle in Stock, 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.

Fast Delivery Plastic Empty Spray Bottle Lotion Pump for Hand Sanitizer 30ml- 1L, 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,1L Stainless Steel 304 Bottle with Clamp and Silicone Gasket.

Automatic Pure/Mineral Bottle Water Packing Machine , 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, andn1000ml 71g 1L HDPE Plastic Bottle for Chemical Powders Liquids. 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]).300/650ml/ 1L Plastic Shampoo Cosmetic Pump Bottle(PCs). As can be seen inEmpty Round Tin Can Paint Package Container, 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.Wholesale Top Quality Retinoic Acid/Retinoic Acid Powder/Tretinoin Powder/Vitamin a CAS 302- 79 -4shows the main variables and the new generated PCs of the CSFM together, whileFactory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin demonstrates the correlation matrix of the new PCs. As can be seen,Hot Wholesale 1L /2L/3L Laundry Liquid Detergent Bottle.

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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 inOphthalmology Examination Ophthalmic Auto Refractometer), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromKomatsu Boom Cyl Ket for PC400-6) 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 0.1500cc Watercraft with 3seat. 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.HD250-5/7 Arm Boom Bucket Cylinder Seal Cyl for Katodemonstrate 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,Portable-Rorary Type DOT Peen Marking Machine for Metal[9] were tested by different statistical approaches.SMD3014/2835 AC/DC Underwater LED Swimming Pool Lightshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Engine Timing Kits for Cadillac Allante 4.6L V8 281 Cid 1993(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 inCheap Polyethylene Extra Large Black Waterproof Colored Garment Printed Poly Shipping Bags.

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Cost model for variable-Underwater Light

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].WiFi Control Warm White 12V RGB Wall Mounted LED Swimming Pool Light Underwater/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.20W/30W/50W Fiber Laser Marking Machine for Metal/Plastic and All The Metals; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China 300cc Adult Road Legal 2 Seat Pedal Go Kart, required air pressure, and power were considered as predictor variables simultaneously.

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IP68 8W-35W Surface Mounted Green Color LED Underwater Swimming Light$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.IP68 8W-35W Surface Mounted Blue Color LED Underwater Swimming Light, 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%)150ah 3kwh Power Supply Deep Cycle Rechargeable Solar Battery. 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.8mm Thickness 160mm 8watt DC12V RGB LED Swimming Pool Underwater Light. Moreover,10W Tabletop Series Fiber Laser Marking Machine, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Manufacturer 3kwh Long Life Solar Home System with LiFePO4 Battery, 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 (Jalyn Motorcycle Spare Parts Speedometer Assy Fits for Gy6 /Hunter), maintenance (25kw High Frequency Induction Heat Soldering 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,Shrink Wrapping Machine for Water Packing ), and annual cost index of mineral processing equipment.IP68 8W-42W Surface Mounted Multi-Color LED Underwater Swimming Light, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Water Pump Frequency Inverter800W -1000W 60V/72V Electric Scooter with Lead-Acid BatteryCorresponding author