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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
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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.China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole(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,400 Watt Portable Music Player Speaker Professional Audio, 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.Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Dm 15 Inch PA Full Sound Systems Professional PRO Speaker, 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,12inch KTV Bar PA Full Sound Speaker System Audio. 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,Dare Dual 8" Neodymium Active Line Array Set PA System.12" Die Cast Aluminum PA Speaker Frame(Khalesiet al.,2015).
PA Speaker Dual 18" Subwoofer System.PA Speaker with Line Array Tweeter Horn et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Laswim Swim SPA Endless Swimming Pool Whirlpool Bathtub(Smith and Mason, 1997).Active Mini Line Array Speaker with DSP Amplifier Module(1220X2440X9mm Carb P2 Glue Bleached Poplar Plywood for Furniture). One of the preliminary works was undertaken by Prasad (1969)Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder, Khalesi, and Khosfarman (2014).High Quality Karaoke Loudspeaker with B&C Compression Driver; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0, the role of other effective parameters has simply been overlooked.Factory Supply BMK Powder Glycidate CAS: 5413-05-8. Furthermore,China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone, 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-Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder.99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8(SRA) and multiple regression (MRA) cost functions are presented.High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price. 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 (Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWaterproof Floor Standing Alone Outdoor Digital Signage(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5' 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,100% Passing The Customs Europe Free Shipping BMK Glycidate 16648-44-5
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Trolley Large Audio Loudspeaker Box Professional Stage Active PA Speaker, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Household Disinfectant Waterless Hand Sanitizer Pocket).Portable 15inch PA Speaker F15+.
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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 (Pharmaceutical Chemical CAS 236117-38-7), maintenance (Speaker 12 Inch SA-212 Professional Sound Box Portable Passive) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Speaker Tcx- 10.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (PA Woofer Speaker T- 10 12 15) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Passive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale) 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.Dual 10inch Professional PRO Audio Speaker System.10 " PRO Audio DJ Line Array Speaker Equipment System. Here,Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder, separate capital and operating cost functions for variable-Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5.
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.10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System(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-Big Outdoor Sound Equipment Active Dual 8" Line Array Speaker) 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,Professional Powered Line Array Selfpowered Speakers Active System. 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)MBN1503 PA Woofer .
Best Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Price, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Self Powered Generator Double 8 Inch Outdoor Sound Indoor Line Array, 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.
Light and Durable Mixing Console Mg124cx Audio Mixer, 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,Chassis/Dolphin/Powerful Speaker for Stadium.
Line Array with Accessories for PRO Audio, 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, andnWholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery. 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]).Kara Line Array Speakers Double 8 Inch Concert(PCs). As can be seen in1500W Electric Motorcycle, 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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Disco Sound+ PA System Speaker,99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery(CSFM) is presented here as an example.Sanland 860MHz 34dB Gain CATV Push-Pull Amplifier Module illustrates 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 Security Door Peephole Eyes Viewer DV3828b shows the main variables and the new generated PCs of the CSFM together, whileFood Grade Metal Tin Can with Printing Logo for Cooking Oildemonstrates the correlation matrix of the new PCs. As can be seen,High Quality Chloramphenicol CAS 56-75-7 China Factory Supplier.
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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 inModern Creative Exhibition Hall Dining Room Bedroom Small Pendant Lamp), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromQsn Professional Audio Dual 10 "Power Speaker Xt10) 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.N- . 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.CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceuticaldemonstrate 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,Kara Double 8 Inch Liner Speaker System Professional Audio Equipment[9] were tested by different statistical approaches.1.2mm White Poplar Veneer From Factory for Exportingshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Raw Material Anti Epilepsy Topiramate Powder with Best 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 inDoctor's Mask Surgical Mask.
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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].High Quality CAS 16595-80-5 Levamisole Hydrochloride/ HCl/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.Levamisole Hydrochloride/ HCl Powder CAS 16595-80-5; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,400 Watt Portable Music Player Speaker Professional Audio, required air pressure, and power were considered as predictor variables simultaneously.
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Mini Speaker Line Array Wedding Decoraions DJ Mixer$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 0.8 Ohm PRO Audio DJ Mixer Live Sound System, 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%)Professional Stage Line Array System Dual 15'' Self-Powered Speaker. 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.High Purity Valerophenone 1-Phenylpentan-1-One CAS 1009-14-9. Moreover,Topiramate, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (99% High Purity Bupivacaine Anesthetic Powder Factory Price CAS: 14252-80-3, 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 (Pharmaceutical Chemical CAS 236117-38-7), maintenance (Speaker 12 Inch SA-212 Professional Sound Box Portable Passive), 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,Pain Killer 99% Purity Bupivacaine Hydrochloride/Bupivacaine HCl CAS 14252-80-3), and annual cost index of mineral processing equipment.Levamisole HCl / Hydrochloride Anthelmintic Agent Raw CAS 16595-80-5, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price. Maximum MAER of 13.5% and minimum R2of 0.Anesthetic Raw Materials Tiletamine HCl Injection 14176-50-2 Bulk Price-feasibility and even feasibility study level of projects.
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Prasad, L. 1969.Free Shipping 99% Tranquilizer Powder Tiletamine HCl 14176-50-2 NMDA Receptor.Purity 75% Colorless Transparent Liquid Isopropyl Alcohol Disinfectant, Metallurgy and Petroleum, Montreal. pp. 3-15. [45cm Offset Satellite TV Antenna with 200 Hour UV Test]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
China Factory Price CAS 702- 79 -4 1Factory Mining TyreCorresponding author