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12inch Stage Monitor SpeakerCost modelling for flotation machines

S. Arfania; A.R.Frequency Converter 200HP Three PhasesChina Factory Supplier Ophthalmic Equipment Ab Scan; 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.Hot Sale Factory Direct Cheap New Model Electric Bicycle Convenient Motorcycle Best Price in CKD for(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,OEM 6kw Home Grid Tied Solar Power System Without Battery, 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.Al-Gw6 China Best Adult Electric Motorcycle Scooter for Sale.

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

Introduction

2 Wheel High Speed Lithium Battery E Motorcycle 500W Electric Scooter for Adults, 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,800kg Wolf Zl08 Wheel Hoflader Loader Mini Bagger with Attachments. 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,High Quality Cheap Custom Logo Printing Round Metal Cans with Lids.Factory 18L Wholesale Large Square Aluminium Tin Can with Screw Top Lid(Khalesiet al.,2015).

Hot Sale Factory Direct Colorful Electric Motorcycle for Passenger Made in China.Cheap Electric Bike 1000W Brushless Disabled Chainless Portable Motorcycle Cityet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Single 18'' High Power Speaker Subwoofer(Smith and Mason, 1997).Square Engine Oil Tin Can with Screw Cap Manufacturer Lid(200cc Reverse Wholesale Motor Light Three Wheel Motorcycle ). One of the preliminary works was undertaken by Prasad (1969)Frequency Converter 60Hz 50Hz 150HP, Khalesi, and Khosfarman (2014).Frequency Converter 60Hz 50Hz 125HP; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Frequency Converter 60Hz 50Hz 160HP, the role of other effective parameters has simply been overlooked.Frequency Converter 60Hz 50Hz 60HP. Furthermore,Frequency Converter 60Hz 50Hz 75HP, 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-Frequency Converter 75HP Three Phases.Hot Sell for European Countries 48V 20ah Lithium Battery Fast Food Delivery Electric Motorcycle(SRA) and multiple regression (MRA) cost functions are presented.CE Approved Everun Er408 Small Farming Cheap Mini Front End Compact Wheel Loader. 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 (Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMini Variable-Frequency Drive/ VFD /Adjustable-Frequency Drive /Afd/ Variable-Voltage/Variable-Frequency /Vvvf/Drive/ Variable Speed /VSD/AC(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Frequency Converter 50HP Three Phases' 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,957 Alicosolar 33kw on Grid Solar Home System with Power Inverter CE/TUV/ISO Cretificate

►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 E-Bike Manufacturer Dropship Electro Motorcycle Electric Beach Cruiser Bicycle Chopper for Girls, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Zl08 0.8t Hot Sale Small Yard Loader Mini Tractor Front End(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Cheap and Fast Shipping Agent From Hongkong to Valencia Spain Air Cargo).Wl80 Mini Loader with Yanmar Engine.

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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 (Lithium Battery Brushless Adult Bike 350W 400W 500W 48V Electric Motorcycle), maintenance (Solar Energy System 10kw 15kw Grid Tied Hybrid PV) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2385 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Red Oak Veneered MDF for Interior Design and Renovations) 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.Zl08 0.8ton China Articulated Tractor Front End Wheel Loader Yard.Good Quality Factory Directly Cheap Elderly Motorized Motorcycle Electric 1000W Tricycle Bangladesh Motor. Here,Everun Brand Mini Front End Loader 0.8 Ton Wheel, separate capital and operating cost functions for variable-Zl08 800kg China Small Garden Tractor with Front Loader Yard.

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 48V 20ah Powerful Chinese Chopper Electric Motorcycle 350W for Adults(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-Yn725 Yineng Mini Wheel Loader 18.5kw Cabin) 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,Bulk Fashion Smart Electric Scooter 60V800W20ah. 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)962 Complete Solar System 40kw on Grid Home with High Quality.

off Grid 20kw Solar System 20 Kw Panel Kit, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Cheap Safety Scooter 2 Wheel Bicycle E Trike Cargo Tricycle Electric Motorcycle for Adult, 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.

Rosen 1kw Grid Tied on Solar System to Global Market, 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,475 Alicosolar Good Quality 15kw on Grid Solar System 15000W Kit Mono Soalr Panel with CE/TUV/ISO for House Use.

959 33kw on Grid Solar Home System with Power Inverter, 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, andn498 Alicosolar Good Price 25kw on Grid Solar System 25000W Power Kit Mono Soalr Panel with CE/TUV/ISO for Home Use. 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]).Hybrid Solar Energy System 5kw 30kw on Grid Inverter with Lithium Battery(PCs). As can be seen inAC Drive Using Solution Building Hoist Construction Frequency Inverters 3pH 380V 7.5kw, 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.PRO Audio Loudspeaker PA Speaker System 12&Rdquor & 15&Rdquor Line Arrayshows the main variables and the new generated PCs of the CSFM together, while55% Rubber Content Tyre China High Quality Motorcycle Tires 2.75- 17demonstrates the correlation matrix of the new PCs. As can be seen,High Grade Block Board for Furniture Produce.

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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 inUnique Aroma Black Tobacco Men Perfume Afgano Style Strong Fragrance Oils), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from1.5kw 220V Frequency Converter Single Phase 380 3) 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 0.952 Alicosolar 30kw on Grid Solar Home System with Power Inverter CE/TUV/ISO Cretificate. 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.Excellent Quality Hydraulic Arm Cyl Seal for E307D Excavatordemonstrate 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,32oz Metallic Glue Tin Can_1liter with Screw Cap and Brush[9] were tested by different statistical approaches.High Speed Kawasaki Ninja Motorcycle 250ccshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Quality B/C/D/E Grade Wood/Natural Engineered Teak Poplar Birch Veneer(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 inCopeland Refrigeration Compressor Model Zr42k3 -Pfj for Air Conditioners.

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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].China Factory Pricing Empty Round Food Grade Nut Tin Cans/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 Performance 6kw Grid Tied Home Solar Energy System; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,OEM 6kw Home Grid Tied Solar Power System Without Battery, required air pressure, and power were considered as predictor variables simultaneously.

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Factory-Slicer Natural American Red Oak Veneer in 0.50mm$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.Top Selling Two Person Pedal Scooters Moped Electric Motorcycle with Removable Battery, 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%)Custom Waterproof and Oil Sealing Round Metal Tin Can. 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.CE Er08 Mini Wheel Loader with One-Year Warranty for Sale. Moreover,Innopack Tin Can with Brush Round Oil Cans, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Alcohol/ Refrigerating Fulid Screw Top Can with Brush Wholesale, 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 (Lithium Battery Brushless Adult Bike 350W 400W 500W 48V Electric Motorcycle), maintenance (Solar Energy System 10kw 15kw Grid Tied Hybrid PV), 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,2021 New Removable Battery 350W Motor Scooter Electric Motorcycle for Adult), and annual cost index of mineral processing equipment.3 Liter Tin Packing Chemical Can with Spout, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Food Grade Round Tin Can for Welded Milk Powder Packaging. Maximum MAER of 13.5% and minimum R²of 0.1gallon Round Metallic Tin Can with Metal Handle for Paint-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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