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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017Â


High Speed Electric Motorcycle ScooterCost modelling for flotation machines

S. Arfania; A.R.Fat Boy Bean Bag Cover for Sports2013 Popular Electric Motorcycle 90km with Pedal CE ; M.R. Khalesi

Tarbiat Modares University, Iran


Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.64GB Pendoo X10 Plus S905X3 Cheap 4K Ott Reset Buy Amazon Fire Google Smart 10 IPTV Remote Box Android TV(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,Living Room Lounge Furniture Sofa Fabric 3 Seater Couch, 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.Stable Quality 1year Qhdtv HD IPTV Abonnement Reseller Panel Lxtream Code All Europe Italy UK USA Spain France Arabic Morocco Channel.

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


Customization Available Modern Popular Home Furniture Set Living Room Leather Sofa, 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,Cafe Bar Table Wrought Iron Home Living Room Dining. 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,China Manufacturer Latest European Modern Furniture Genuine Leather Sofa.Simple Design Bedroom Furniture L-Shaped Movable Corner Sofa Set with Table(Khalesiet al.,2015).

New Products Lift Recliner Chair Sofa .Latest L Shape Genuine Leather /Bonded /PU /Fabric Flat Bedroom Furniture Sofa Bedet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Grid Tied 100kw 200kw 300kw Solar System(Smith and Mason, 1997).Wholesale Arabic Style Modular Furniture Top Genuine Leather Living Room Set with Tea Table(4 Liter Rectangle Metal Tin Can for Olive Oil Package and Peanut with Flexible Spout). One of the preliminary works was undertaken by Prasad (1969)Quad Core Media Player Mxq PRO S905W Android Best Kodiiptv Set Top Box TV with SIM Card Slot, Khalesi, and Khosfarman (2014).High Quality Footbath Sofa / Foot Massage; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,New Products Lift Recliner Chair Sofa , the role of other effective parameters has simply been overlooked.SP-KS410) Customized Fabric Softwood Frame Sofa. Furthermore,IPTV Reseller Panel for Qhdtv Susbcription 1year Code Wholesale 1500+ Live & VOD Sports News Channels Arabic French Belgium African Andoird TV Box, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Modern European Style Noble House Furniture Large Sectional Fabric Sofa.Factory Offer Nordic Removable and Washable Livingroom Fabric Sofa(SRA) and multiple regression (MRA) cost functions are presented.1 Year Qhdtv Abonnement IPTV Subscription Code Europe Spain Portugal France Italia Arabic Italy French Belgium for Android Smart TV Box M3u. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (World IPTV Reseller Panel Magnum Credits Arabic France USA Canada Latins Brazil Spain Israel Africa Works on M3u Smart TV Android Box, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSelling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;800kg Wheel Loader Mini 780 Radlader' 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,Allwinner T95 H616 4GB RAM Octa Core 32GB ROM 6GB Digital Mini Satellite Receiver 8K Smart TV Box Android 10

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Cheapest Set Top Box Mxq PRO Rk3229 Android 7.1 Quad Core 1GB 8GB TV, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Nordic Leather Sofa Modern Simple Three Seats(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (99% Purity Andarine/S4 Sarms Powder CAS: 401900-40-1).Best Selling Modern Design Living Room Classic Leather Recliner Massage Chinese Home Furniture.

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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 (Wholesale Folding Bed Space Saving Furniture Sofa Modern Recliner), maintenance (Wholesale Price Modern Italy Leather/ Fabric Couch Sofa Corner Home Furniture) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,2021 New Modern Design Living Room Leather Sofa.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Tx6s H616 4GB 32GB VGA IPTV Brasil Android RAM ROM 6GB 8K 2GB 16GB 10.0 2021 Box TV) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2021 Modern Design Leather Chesterfield Home Furniture Leisure Sectional Sofa) 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 European Style Modern Furniture.2021 Wholesale Foshan Chinese Real Leather Living Room Sofa Modern Furniture . Here,VFD Ultra-Low-Noise Delixi 55kw 720va Variable Frequence Inverter, separate capital and operating cost functions for variable-Modern Home Furniture Living Room Leather Fabric Electric Massage Lounge Leisure Recliner Sofa.

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.7.5kw VFD Drives/ Frequence Inverter/Converter/ AC Drive Enc(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-Wholesale Folding Bed   Recliner Sofa Beds Fabric) 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,Modern Furniture. 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)Foshan Factory Wholesale High Quality Living Room Leather Sofa.

Tx6s H616 32GB ROM Recorder Android 4GB RAM Stick Set Top 2021 SIM Card Ott WiFi Andriod Smart TV Box, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Motor Electronic Power Frequency Converter 380V 2.2kw, 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.

Pipo X8 Mini PC Smart TV Box, 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,Twisan Honoured Production 800kg Small Front End Loader with High Quality.

Frequency Inverter 380V 50/60Hz, 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, andn15kw Frequency Inverter for Solar Panel and Fan Pump Input 380-600V DC. 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]).AC Drive for Bridge Crane VFD Using Mono Overhead 3pH 380V 11kw(PCs). As can be seen inUltrasonic a B Scan Ophthalmic Eye Ultrasound Scanner with Low Price, 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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Frequency Inverter/Electrical Converter/Inversor/Power Inverter/Variable Speed Controller,50 to 60 Hz Frequency Converter(CSFM) is presented here as an example.1 Liter Metal Square Tin Can with Screw Lid for Oil Paint Chemicalillustrates 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.Anti-Scratch PC Polycarbonate Impact Solid Sheet Extrusion Machineshows the main variables and the new generated PCs of the CSFM together, whileGuarantee Lowest Price 2-Phenylbenzimidazole CAS 716- 79 -0 in Hot Selling Fungicidedemonstrates the correlation matrix of the new PCs. As can be seen,AC Variable Vector Frequency Inverter.

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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 inCOB LED Strip Waterproof DC 12V/24V Flexible Light High CRI 90 for Home/ Hotel/ Decorative Lighting), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromPNG Easy Install 12kw 15kw Grid Tied System with Home Delivery Service) 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.AC Drive Solar Charge Controller 3 pH Inverter Welding Machine Elevator Motor Price. 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.Gurjan Veneer Keruingdemonstrate 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,AC Drive Frequnce Converter 5.5kw Pump Use [9] were tested by different statistical approaches.Bluetooth 5.0 Headset Mini Tws True Wireless Earbuds Stereo Bass in-Ear Earphoneshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.0.8 Ton Mini Wheel Loader with Lowest Price(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 inChristmas Santa Claus.

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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].Automatic Motor Speed Controller Variable AC Drive 1/3 Phase 1.5 Kw 220 V/380 V/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.


Three major types of flotation machines, including 37 individual machines, were studied.Water Pump Frequency Inverter; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Living Room Lounge Furniture Sofa Fabric 3 Seater Couch, required air pressure, and power were considered as predictor variables simultaneously.

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VFD AC 380V 1.5kw Three Phase Inverter Frequency Converter Variable Drive$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.Variable Speed Drive MPPT Motor Controller Solar Pump Inverter Power Supply, 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%)Compact Mini Farm Loader 800kg Wheel for Sale. In the MRA cases, this property is owed to the SFM (3.05%).


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.Frequency China Vector Control AC Drive Power Supply Inverter Solar Converter. Moreover,0.8ton Zl08f Small Wheel Loader, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Loading Machine, 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 (Wholesale Folding Bed Space Saving Furniture Sofa Modern Recliner), maintenance (Wholesale Price Modern Italy Leather/ Fabric Couch Sofa Corner Home Furniture), 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,Mini Radlader with Ce for Germany and Sweden Market), and annual cost index of mineral processing equipment.China Compact Payloader Zl08 Mini Front End Wheel Loader with Ce, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Farm Equipment 800kg Small Loader Payloader for Sale. Maximum MAER of 13.5% and minimum R2of 0.Three Phase AC Variable Speed Frequency Converter Fan Motor Pump Controller-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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