GENERAL PAPERS

Agriculture Fertilizer Nitrogen 21% Ammonium Sulfate China FactoryCost modelling for flotation machines

S. Arfania; A.R.Heavy Loader 5wheel Cargo Tricycle with CabinStand Alone Tub Small Oval 55 Inch Free Standing Acrylic Bathtub; 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 Precision and Fast Speed Nonmetal CO2 Laser Marking Machine(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,Motor Cargo Tricycle for 2-3ton Loader, 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 0.1L Empty Round Tin Can with Plastic Lid Manufacturer.

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

Introduction

1L Extra Virgin Olive Oil Metal Can with Cover, 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,Solar & Mains 3840wh 80A 220V Outlet Battery for Appliances with Rated Power Under 1500W. 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,Gy6 -125/ 150ccformaular.Double Chasis Cargo Tricycle(Khalesiet al.,2015).

Euro 5 Gy6 -50cc 4t Moped.Chinas Motos Electricas 500W/ 800W /1200W/1000W Electrical Electric Scooter et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 100% High Purity Polyamide Resin for Ink(Smith and Mason, 1997).Water Proof Closed Box Delivery Tricycle(Komatsu PC270-7 Arm Cyl Ket). One of the preliminary works was undertaken by Prasad (1969)3840watts 50Hz 80A Built-in Inverter Silent Power Portable Electric Storage and Generator with CE Certificate, Khalesi, and Khosfarman (2014).Barrow Mini Dumper with Three Wheels; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,3840watts AC Output 80A 50Hz 220V Silent Power Portable Electric Storage and Generator with CE Certificate Built-in Inverter, the role of other effective parameters has simply been overlooked.Oil Petrol Anti Corrosive Tantalum Diaphragm Pressure Sensor. Furthermore,20/30/50/60/100W Raycus Max Jpt Ipg Table 3D CO2 Mopa Color Logo Printer Marker Fiber Laser Marking Machine, 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-Gy6 150cc EEC Scooter.250W- 800W Handicapped Mobility Scooter for Old People with Basket(SRA) and multiple regression (MRA) cost functions are presented.with Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty. 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 (Camping Power / RV LiFePO4 Energy Storage Portable Generator 3.8kwh 80A 220V AC Output Enjoys 2 Years Warranty, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDouble 12" Line Array Speaker(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;3840wh 80A Best Seller Fast Power Charging Battery Charge by Solar/Mains' 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,2021 Most Hot Selling Electric Mope E-Motorcycle 500W- 800W

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Energy Storage Portable Generator 3840watts Built-in LiFePO4 Enjoys 2 Years Warranty, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),30W CO2 Touch Screen Laser Marking Coding Engraving Machine(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Car Emblem with Silver Dragon Shape).with Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh Enjoys 2 Years Warranty.

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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 (Solid State Inductive Heating Furnace for Tyre Cord Wire), maintenance (Factory Supply Biomass Rice Husk Charcoal Making Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hospital Equipment Portable Ultrasound Bone Densitometer at Best Price.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Ce Approved Ho-100 Eyes Hospital Use Ophthalmic Ultrasound Scanner) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Outdoor/Home Use Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty) 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.Low Failure Rate High Efficiency Induction Metal Heating Machine .Portable Ultrasonic Ophthalmology Ophthalmic a/B Scan. Here,Sy-AC51 Ce Approved WiFi Android/iPhone/iPad Wireless Double Head Probe, separate capital and operating cost functions for variable-Camping Power / RV LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty.

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.Hot Sale Mini High Frequency 25kw Induction Heater Price(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-Convex Series Probe Type Wireless Mini Ultrasound Scanner) 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,2ND Generation Ultrasound Bone Densitometer. 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 2ND Generation Ultrasound Bone Densitometer.

Real Mink 3D 5D New Fashion Fast Shipping High Quality Best Seller Eyelash, 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 Economic Ultrasound a/B Scan for Ophthalmology , 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.

Ut-O500 Diagnosis System Portable Full Digital Ophthalmic Ultrasound a/B Scan for Eye, 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,Ophthalmic a Scan and Pachymeter Combined Unit.

Ophthalmic Optical Pachymeter & Biometer / a Scan , 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, andn1000MHz FTTH Trunk Line CATV Mini 2 Ports Signal Amplifier. 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]).Roadside Emergency Set Auto Car Tool Kit(PCs). As can be seen inFrequency Converter for Small Power Motors 3pH 380V 50/60Hz, 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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2200 Degree Vacuum Hot Pressing Furnace High-Temperature for Cim,Portable Induction Heater for Crystal Growth(CSFM) is presented here as an example.PRO Audio PA Speaker 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.5L Metal Round Cans for Paint or Chemical Packagingshows the main variables and the new generated PCs of the CSFM together, while3.00- 17 Super High Quality Natural Rubber Motorcycle Tire.demonstrates the correlation matrix of the new PCs. As can be seen,Dry diaphragm membrane sanitary pressure transducer.

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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 in600kVA/480kw Power Generator Set Diesel Engine Genset for Hotel), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from1GHz Outdoor Bi-Directional CATV Amplifier) 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.High Frequency Induction Heater . 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.Double 10 " PA Mobile Multiple Bt Wireless Microphone Trolley LED Party Karaoke Loud Speaker with Multimedia Large Multi-Colored Disco Woofer and Batterydemonstrate 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,Industrial Vacuum Atmosphere Hot Pressing Sintering Furnace[9] were tested by different statistical approaches.Hot Selling Ceftriaxone Sodium CAS 104376- 79 -6 Top Qualityshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Softel 4u 12 Channel Agile CATV Analog RF Modulator(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 inWedding Dress.

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Cost model for variable-Maintence Grease Gun 21V LCD Real Time Information Reading Hand Tool

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].Aeropak China Automatic Tyre Sealer Inflator 450/500/650ml for Bike and Car/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.High Quality Melamine MDF with Competitive Price Ce Carb Grade; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Motor Cargo Tricycle for 2-3ton Loader, required air pressure, and power were considered as predictor variables simultaneously.

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Melamine MDF E1 E0 Carb P2 Grade$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.Transparent Ceramics Hot Press Sintering Furnace, 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%)6mm Raw Plain MDF ISO9001/ Carb for Decoration. 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.ISO. Moreover,Se0/Fsc/ Carb Naf 18mm MDF Board, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (HPM410W Submerged Integrated Level Sensor Transmitter, 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 (Solid State Inductive Heating Furnace for Tyre Cord Wire), maintenance (Factory Supply Biomass Rice Husk Charcoal Making 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,Industrial Mining All Welded Anti Explosion Pressure Transmitter), and annual cost index of mineral processing equipment.GAS Wind Pressure Transmitter with Data Display, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Carb /SGS Wood Fiber New Design 1220*2440mm Melamine MDF. Maximum MAER of 13.5% and minimum R²of 0.Coconut Shell Carbon Charcoal Making Machines Production Line-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Gy6 -50cc Scooter1L 2L 5L 10L 100ml 200ml 500ml Wine Glass BottlesCorresponding author