GENERAL PAPERS

Modern European Style Noble House Furniture Large Sectional Fabric SofaCost 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.Grid Tied Wind 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,Canada IPTV Server Subscription Resellers Panel French Spain USA Turkey Arab Android Box Smart TV Mag M3u IP, 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.Ash Solid Wood decoration Board.

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

Introduction

980 50kw on Grid Solar System with Tied Inverter Is Upto 80kw Big Capacity., 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,800ml Square Metal Containers. 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,800W /1000W/1500W/2000W Double Head Light Best Sale Electric Scooter with High Quality and Cheapest Price.Hot Sale 800ml Size 1liter Engine Oil Tinplate Tin Can with Metal Pressure Lid(Khalesiet al.,2015).

Hot Sale Metal Round Cans for Paint or Chemical Packaging.Everun CE Approved Articulated Er08 0.8 Ton Multifunction Front End Loader with Standard Bucketet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Best Price Sab-500 Ophtalmic Ab Scan(Smith and Mason, 1997).Wholesale Cmyk Printing 0.5 Liter Chemical Tin Cans(N21% Caprolactam Grade Ammonium Sulphate). One of the preliminary works was undertaken by Prasad (1969)Un Approved 0.5 Liter Metal Square Paint Empty Tin Cans, Khalesi, and Khosfarman (2014).5 Liter Tinplate Metal Packing Car Paint Container Engine Oil Tin Can; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,China Manufacturers Offer Cheap Price Front End Mini Shovel Loader 800 Kg, the role of other effective parameters has simply been overlooked.Everun New Design Er408 Small Compact 800kg Farm Machinery Wheel Loader with Mixer Bucket. Furthermore,Tin Can Manufacturer Customizable Cmyk Automotive Paint Rectangle Cans, 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-Titan Brand 0.8 Ton High Quality Mini Wheel Loader with and Performance..High Duty Chinese mini loader(SRA) and multiple regression (MRA) cost functions are presented.Exclusive Model Electric Scooter 800W 1000W High Torque Matt Black. 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 (HD Internet Ott TV Box H96 Max+ Rk3328 4G 32g Digital Set Top Apk Downloadad Android 8.1, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in1L Tin Can with Metal Cap for Food Storage(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Yn725 Yineng Mini Wheel Loader 18.5kw Cabin' 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,Mag City Scooter 80km Range Two Wheel Electric Motorcycle

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Electric Scooter/ Motorcycle/TM-BQ, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Commerical Okoume Plywood for Sale(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wholesale Cheap Custom Round Design Casting Antique Silver Plating Finisher Medal).Go Kart .

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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 Go Kart ), maintenance (Everun 0.8ton Mini Wheel Loader with Euro III Engine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,New Model AL908 0.8ton Mini Wheel Loader with Wood Grapple for Sale.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Cheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric Motorcycle) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (5HP 50Hz 60Hz 3.7kw 3 Phase VFD Variable Frequency Drive for 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.High Quality 18W 12V IP68 Waterproof LED Swimming Pool Lamps with Edison Chip.50Hz 60Hz 220V/380V Vector Control AC Variable Frequency Drive. Here,3 Phase 11kw Speed Low Cost AC Variable Frequency Drive Inverter VFD Manufacturers for Electric Motor, separate capital and operating cost functions for variable-Triple Phase 380V 50Hz 60Hz 7kw AC Variable Frequency Converter.

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.Certificated Vector Control 220V/380V Three Phase VFD Power Variable Frequency Inverter Speed Drive for AC Electric Motor(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-Growatt Solar Inverter 17kw 20kw 25kw Grid Tied Three Phase on Power 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,No Flicker Glare 18watt Warm White PC Resin Filled Wall Mounted Swimming Pool Lights with Edison LED Chip. 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)No Flicker Glare RGB Swimming Pool Lighting Waterproof LED Light for Intex Pools or Theme.

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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.

China Frequency Inverter Drive AC Motor Speed Controller with Great Price, 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,China Heavy Load Inverter 220V 380V Three Phase Converter DC to AC.

3000W Grid Tied Solar System for Home Use, 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-Full Baltic White Birch Plywood From Factory 12mm 15mm. 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]).Sapelli Plywood(PCs). As can be seen in1L Olive Oil Can Cooking Empty Tin Can/Pot Metal, 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.Customized 1L Round Empty Metal Oil Paint Package Tin/Can Containershows the main variables and the new generated PCs of the CSFM together, whileAdv. 1 Alloy Wheel demonstrates the correlation matrix of the new PCs. As can be seen,Electric Scooter 800W 60V20ah Lead Acid.

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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 inProtective Face Mask Surgical Medical Mask), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromDigital Tuner ) 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.UV White Birch Plywood 18mm Carb E0 Cabinet. 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.Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehousedemonstrate 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,18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood[9] were tested by different statistical approaches.800W Electric Motorbike with Front Disc Brakeshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.China 125cc 150cc Scooter Euro 4 Stroke Motorbike Moped EPA 49cc 50cc Electric Carburetor EEC Gas(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 inChina Low Cost Construction Projects of Fast Build Prefab Steel Structure House.

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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].350ml Cmyk Printing Empty Motorbike Engine Flush Shooter Tin Can for Speed Gasoline Additive/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.French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Canada IPTV Server Subscription Resellers Panel French Spain USA Turkey Arab Android Box Smart TV Mag M3u IP, required air pressure, and power were considered as predictor variables simultaneously.

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Wholesale Round Food Packaging Empty Tin Metal Cooking Oil Cans$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 0.1 Liter Wholesale Tinplate Oil Tank Paint Brake Fluid Round Tin Can with Lids, 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%)2021 Everun New Design Er408 Small Front End Loader 0.8ton Mini Wheel. 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.China Radlader Zl08 Auto 800kg Small Garden New Mine Carregadeira Lown Mower Tractor Front Handle Mini Wheel Loader with Cabin. Moreover,Chinese Eougem Zl08 Wheel Loader with Torque Converter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Articulated Mini Wheel Loader Er08 Telescopic Boom, 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 Go Kart ), maintenance (Everun 0.8ton Mini Wheel Loader with Euro III Engine), 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,Cable TV Pendoo X99 Max Rk3399 4G 32g Android 7.1 Internet Smart Box with HD Satellite Receiver), and annual cost index of mineral processing equipment.Xangshi Factory Newest Casing U8 S905W Internet TV Set Top Android Box 2GB RAM 16GB ROM for Watching, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,New Design Go Kart 150cc . Maximum MAER of 13.5% and minimum R²of 0.External Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router-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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