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Hydrating Nourish Relieve Skin Pain Beard Hemp Care
On-line version ISSN2411-9717
Print version ISSN2225-6253
J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017
http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â
GENERAL PAPERS
99% Pure High Quality Anesthetics Cinchocaine 85- 79 -0Cost modelling for flotation machines
S. Arfania; A.R.Supply Alcohol Soluble Polyamide Resin for InkGood Quality Food Additive Maltose Powder 69- 79 -4; 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.CAS No. 151103-09-2 4- (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,Sophisticated Price of Polyamide Resin for Whosale, 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 0.100% Purity Phenol Polyamide Resin.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
High Polyamide Resin, 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,Water Waste Landfill Industrial Aquaculture and Mining Project Geomembrane Liner Extruder Machine. 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,Hot Sale Hy-688 Polyamide Resin.100% High Purity Polyamide Resin for Ink(Khalesiet al.,2015).
Jwell-PVC Plastic Rigid Transparent Sheet Thickness 0.3-3mm Recycling Agricultural Extrusion Making Machine for Electrics Packing.Polyamide Resinet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for L18 /86131 Falante Professional 18inch Subwoofer 700W New Product China Supplier Hot Sale(Smith and Mason, 1997).Jwell-PVC Plastic Foaming|Semi-Skinning Board Recycling Agricultural Making Extrusion|Co-Extrusion Machine for Furniture Decoration Factory Direct Buy(Media Player Android 6.0 2g+16g Internet Smart TV Box). One of the preliminary works was undertaken by Prasad (1969)Geomembrane Making Machine, Khalesi, and Khosfarman (2014).Spoke Wheel 26-Inch 21-Speed Top with Bicycle; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,26 Inch Mountain Bike From China Bicycle, the role of other effective parameters has simply been overlooked.PE Waterproof Roll Extrusion Machine. Furthermore,PE Extra-Width Geomembrane/Waterproof Sheet Extrusion Line, 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-PE Geomembrane/Waterproof Sheet Extrusion Line.6speed 20inch Wheel Aluminum Alloy Folding Mountain Bike(SRA) and multiple regression (MRA) cost functions are presented.Bike Hidden Folding Mountain Ebike Suspension Bicycle. 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 (Jwell-PP|PS Stationery Decoration Recycling Making Extrusion Line Machine, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Motorcycle Parts Tyre (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Factory Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorber' 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,Iron Oxide Yellow for Pet Feeds
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Cosmetic Ultramarine Violet Soap Pigment Matte Manufacturer, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Cosmetic Grade Ultramarine Violet Manufacturer(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (2021 Polyester Webbing Sling GS Ce Sf 7: 1).Factory Supply Benzaldehyde CAS 100-52-7 99% with Best Price in Stock.
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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 (Dimer Acid Based Polyamide Resin for The Epoxy Material), maintenance (Dimer Acid Liquid for Monthly Output 5000mt Co-Solvent Polyamide Resin) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Weather Resistance Nylon Polyamide Resin.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (High Purity 2) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Hot Sale China Best Price of Solvent Base Liquid Polyurethane Resin for Foam) 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.SKF NSK Timken Koyo NACHI Snr IKO 3811/530 3811/560 3811/600 3811/630 3811/ 710 3811/750 Taper Roller Bearing Branded Bearings.Single Row Cylindrical Roller Bearing . Here,Good Wear Resistance and High Tenacity Engineering Plastic 610 for Brush Wire, separate capital and operating cost functions for variable-OLED Intermediates 2-.
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.Zys Hot Sale Wind Turbine Bearing 010.30.560/630/ 710(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-Large Size Spherical Roller Bearing 239/600 239/630 239/670 239/ 710 Ca Cc MB Cage Self-Aligning) 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,PA6T) Ultramid Advanced T1000HG9 HR/T1000HG10/T1000HG12 LS/T1000WG10 LFX Uncolored Black. 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)Dust Collector Machine Wood.
CAS No: 67700-43-0 Esters Soluble Liquid PU Polyurethane Resin for Inks, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Adhesion Polyurethane PU Resin for Printing Ink, 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.
Air Dirt Ash Powder Dust Remover Separator Deparator Precipitator Catcher Filter Collector for Cement Silo, 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,Top Selling Polyurethane Adhesive Resin.
Jwell PLA Pet Sheet Cup Packing Making Extrusion Line Machine, 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, andnPA Resin for Gravure Plastic and Paper Printing Ink. 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]).Jwell-PLA Pet Sheet Recycling Cup Packing Making Extrusion Machine(PCs). As can be seen inFree Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5, 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.
Jwell-PLA Sheet Recycling Plastic Cup Food Packing Making Extrusion Machine
Good Performance Polyurethane PU Resin for Gravure Printing Ink,Jwell HDPE Waterproof Membrance Roll Extrusion Line(CSFM) is presented here as an example.2440mmx1220mmx3mm Carb P2 Formaldehyde Raw HDF Boardillustrates the high correlation between predictor variables for the CSFM.
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.Rifamycin S 96% CAS: 13553- 79 -2shows the main variables and the new generated PCs of the CSFM together, whileGold Dust Collector Cement Filter Bagdemonstrates the correlation matrix of the new PCs. As can be seen,Silo Top Pulse Jet Dust Collectors Collector Hopper for Cement.
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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 inOTR Tyre/off-Th-Road Tyre), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSeaweed Iodine Factory Price Wholesale 99% with Chemical CAS/ 68333- 79 -9) 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
CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film
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.Dust Collector Woodworking Machinery Supplier. 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.Food Packaging Bag Manufacturer Kraft Paper / Matte Glossy Finish Pouch with Foil Lined Hot Sale Cheap Wholesale Item Wire Stock Storage Bagsdemonstrate 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,Jwell-PLA Biodegradable Sheet Recycling Cup Making Extrusion Machine[9] were tested by different statistical approaches.Diesel Engine Parts Fuel Injection Nozzle 150s424n470shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Excellent Gel Resistance Ability Polyamide Resin(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 in2021 Fashion Trend Portable Massager Massage Gun.
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Cost model for variable-Jwell PP/PC Sheet Extrusion Equipment
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].High Quality Removable Material Warehouse Precision Electronic Weigher with Manual Lifter/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 Toughness and Tensile Strength Resin 610; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Sophisticated Price of Polyamide Resin for Whosale, required air pressure, and power were considered as predictor variables simultaneously.
Toughness High Engineering Plastics 610 for Auto Parts. Moreover, the operating cost was detailed in different cost items.Three Heads Woodworking Machine Atc CNC Router, indicated inUlipristal Acetate Pharmaceutical Raw Materials CAS 126784-99-4 for Contraception, and major extrapolation should be avoided.
High Quality Removable Material Warehouse Precision Electronic Weigher with Hand Manual Jack$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.HDPE Water/Gas Supply Pipe Extrusion Line, 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%)Automatic Tool Changing CNC Router with 9kw Hsd Spindle. Wood Door Carving Atc. 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.Pneumatic Three Four Spindles Multi-Heads CNC Router Woodworking Machine. Moreover,Disc Atc Automatic Tools Changer Wood CNC Router Woodworking Machine, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Tank Dust Removing Machine with Filter Cartridge, 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 (Dimer Acid Based Polyamide Resin for The Epoxy Material), maintenance (Dimer Acid Liquid for Monthly Output 5000mt Co-Solvent Polyamide Resin), 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,Quadrant Stainless Steel Shower Room with 8mm Tempered Glass), and annual cost index of mineral processing equipment.HDPE Water/Gas Supply Pipe Extrusion Machinery, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Factory Price 1325 Atc CNC Router Automatic Tool Change Machinery. Maximum MAER of 13.5% and minimum R2of 0.HDPE Water/Gas Supply Pipe Extrusion Equipment-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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