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


Modern Simple Hotel Lobby Discussion Living Room Leisure SofaCost modelling for flotation machines

S. Arfania; A.R.Polyamide Resin Hot Melt AdhesiveChina Frequency Converter Variable Speed Drive; 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.Polyamide Resin(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,Co-Soluble Polyamide Resin with Top Quality, 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.Alcohol Polyamide Resin for Printing Ink.

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


Popular Alcohol Soluble Polyamide Resin for Gravure Ink, 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,Polyamide Resin with Benzene Soluble for Printing Inks. 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,Alcohol Soluble Polyamide Resin for Printing Ink.Supply Rosin Modified Polyamide Resin for Paint(Khalesiet al.,2015).

Farwell P-Hydroxy Benzaldehyde with High Purity 99.5%.High Quality Benzaldehyde with Fast Deliveryet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Disodium Hydrogen Phosphate Dihydrate Food Grade(Smith and Mason, 1997).Supply Alcohol Soluble Polyamide Resin for Ink(Skin Renew Thermal RF & Fractional 2 in 1 Machine). One of the preliminary works was undertaken by Prasad (1969)CAS No. 151103-09-2 4- , Khalesi, and Khosfarman (2014).Sophisticated Price of Polyamide Resin for Whosale; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,100% Purity Phenol Polyamide Resin, the role of other effective parameters has simply been overlooked.High Polyamide Resin. Furthermore,Water Waste Landfill Industrial Aquaculture and Mining Project Geomembrane Liner Extruder Machine, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Hot Sale Hy-688 Polyamide Resin.100% High Purity Polyamide Resin for Ink(SRA) and multiple regression (MRA) cost functions are presented.Jwell-PVC Plastic Rigid Transparent Sheet Thickness 0.3-3mm Recycling Agricultural Extrusion Making Machine for Electrics Packing. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Polyamide Resin, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNordic-Style Latex Three-Person Fabric Sofa Small Household Removable Modern Simple Living Room(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Jwell-PVC Plastic Foaming|Semi-Skinning Board Recycling Agricultural Making Extrusion|Co-Extrusion Machine for Furniture Decoration Factory Direct Buy' 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,PE Extra-Width Geomembrane/Waterproof Sheet Extrusion Line

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,PE Geomembrane/Waterproof Sheet Extrusion Line, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),6speed 20inch Wheel Aluminum Alloy Folding Mountain Bike(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (New Design Mens Polo Shirt 100% Cotton Customized for Men).Bike Hidden Folding Mountain Ebike Suspension Bicycle.

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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 (Jwell-PP|PS Stationery Decoration Recycling Making Extrusion Line Machine), maintenance (Factory Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorber) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hot Sale Am 20 "Mountain Bike with 21 Speeds.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect Paints) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Adult Foldable Fold Road Bike MTB Mountain Bicycle Sdc -902) 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.Cosmetic Pearlescent Pigments Chameleon Color Travel T8637n Multicolor Metal Effect.Iron Oxide Yellow for Pet Feeds. Here,Cosmetic Ultramarine Violet Soap Pigment Matte Manufacturer, separate capital and operating cost functions for variable-Cosmetic Grade Ultramarine Violet Manufacturer.

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.Factory Supply Benzaldehyde CAS 100-52-7 99% with Best Price in Stock(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-Dimer Acid Based Polyamide Resin for The Epoxy Material) 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,Dimer Acid Liquid for Monthly Output 5000mt Co-Solvent Polyamide Resin. 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)Weather Resistance Nylon Polyamide Resin.

High Purity 2, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Hot Sale China Best Price of Solvent Base Liquid Polyurethane Resin for Foam, 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.

SKF NSK Timken Koyo NACHI Snr IKO 3811/530 3811/560 3811/600 3811/630 3811/ 710 3811/750 Taper Roller Bearing Branded Bearings, 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,Single Row Cylindrical Roller Bearing .

Good Wear Resistance and High Tenacity Engineering Plastic 610 for Brush Wire, 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, andnOLED Intermediates 2-. 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]).Zys Hot Sale Wind Turbine Bearing 010.30.560/630/ 710(PCs). As can be seen in99% Pure High Quality Anesthetics Cinchocaine 85- 79 -0, 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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PA6T) Ultramid Advanced T1000HG9 HR/T1000HG10/T1000HG12 LS/T1000WG10 LFX Uncolored Black,Dust Collector Machine Wood(CSFM) is presented here as an example.Media Player Android 6.0 2g+16g Internet Smart TV Boxillustrates 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.High Quality Motorcycle Parts Tyre shows the main variables and the new generated PCs of the CSFM together, whileHigh Purity Valerophenone 1-Phenylpentan-1-One CAS 1009-14-9demonstrates the correlation matrix of the new PCs. As can be seen,CAS No: 67700-43-0 Esters Soluble Liquid PU Polyurethane Resin for Inks.

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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 in3D Wheel Aligner H9/Garage Equipment/Automotive Equipment/Auto Maintenance/Wheel Alignment Machine Price/Wheel /3D Alignment/Alignment), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from2440mmx1220mmx3mm Carb P2 Formaldehyde Raw HDF Board) 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.Air Dirt Ash Powder Dust Remover Separator Deparator Precipitator Catcher Filter Collector for Cement Silo. 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.Gold Dust Collector Cement Filter Bagdemonstrate 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,Top Selling Polyurethane Adhesive Resin[9] were tested by different statistical approaches.Fried Chicken Sweet Chili Sauce Food Packagingshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Jwell PLA Pet Sheet Cup Packing Making Extrusion Line Machine(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 Manufacturer Floor Spring Machine Light Duty 80kg Glass Spring/Floor Hinge HD-130.

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Cost model for variable-PA Resin for Gravure Plastic and Paper Printing Ink

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].Jwell-PLA Pet Sheet Recycling Cup Packing Making Extrusion Machine/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.Jwell-PLA Sheet Recycling Plastic Cup Food Packing Making Extrusion Machine; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Co-Soluble Polyamide Resin with Top Quality, required air pressure, and power were considered as predictor variables simultaneously.

Good Performance Polyurethane PU Resin for Gravure Printing Ink. Moreover, the operating cost was detailed in different cost items.Jwell HDPE Waterproof Membrance Roll Extrusion Line, indicated in954 Alicosolar 33kw on Grid Solar Home System with Power Inverter CE/TUV/ISO Cretificate, and major extrapolation should be avoided.

Silo Top Pulse Jet Dust Collectors Collector Hopper for Cement$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.CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film, 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%)Dust Collector Woodworking Machinery Supplier. 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.Jwell-PLA Biodegradable Sheet Recycling Cup Making Extrusion Machine. Moreover,Excellent Gel Resistance Ability Polyamide Resin, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Jwell PP/PC Sheet Extrusion Equipment, 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 (Jwell-PP|PS Stationery Decoration Recycling Making Extrusion Line Machine), maintenance (Factory Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorber), 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,High Quality Removable Material Warehouse Precision Electronic Weigher with Manual Lifter), and annual cost index of mineral processing equipment.High Toughness and Tensile Strength Resin 610, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Toughness High Engineering Plastics 610 for Auto Parts. Maximum MAER of 13.5% and minimum R2of 0.Three Heads Woodworking Machine Atc CNC Router-feasibility and even feasibility study level of projects.


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Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [Portable Fiber Laser Marking Machine for Vin Code/Number]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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