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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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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

Professional Audio Speaker Column Sound EquipmentCost modelling for flotation machines

S. Arfania; A.R.PA Speaker Dual 18" Subwoofer System1500W Electric Motorcycle; 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.PA Speaker with Line Array Tweeter Horn (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,Active Mini Line Array Speaker with DSP Amplifier Module, 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.Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder.

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


Introduction

High Quality Karaoke Loudspeaker with B&C Compression Driver, 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,99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0. 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,Factory Supply BMK Powder Glycidate CAS: 5413-05-8.China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone(Khalesiet al.,2015).

Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder.99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports(Smith and Mason, 1997).High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price(4-20mA Oil Fuel Sensor Explosion Proof Differential Pressure Transmitter). One of the preliminary works was undertaken by Prasad (1969)Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5, Khalesi, and Khosfarman (2014).99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs, the role of other effective parameters has simply been overlooked.62442 Shiny and Non Phena Powder 62 44 2. Furthermore,Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate, 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-Hair Loss Treatment Acetyl Tetrapeptide-3/Capixyl CAS 827306-88-7 Purity Min 99% Powder.100% Passing The Customs Europe Free Shipping BMK Glycidate 16648-44-5(SRA) and multiple regression (MRA) cost functions are presented.Trolley Large Audio Loudspeaker Box Professional Stage Active PA Speaker. 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 (BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSanland 860MHz 34dB Gain CATV Push-Pull Amplifier Module (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Portable 15inch PA Speaker F15+' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Dual 10inch Professional PRO Audio Speaker System, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),10 " PRO Audio DJ Line Array Speaker Equipment System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Car Emblem Wtih Motorsport Letter).Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder.

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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 (Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5), maintenance (10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Big Outdoor Sound Equipment Active Dual 8" Line Array Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Powered Line Array Selfpowered Speakers Active System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (MBN1503 PA Woofer ) 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.Best Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Price.Self Powered Generator Double 8 Inch Outdoor Sound Indoor Line Array. Here,Light and Durable Mixing Console Mg124cx Audio Mixer, separate capital and operating cost functions for variable-Chassis/Dolphin/Powerful Speaker for Stadium.

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.Line Array with Accessories for PRO Audio(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-Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery) 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,Kara Line Array Speakers Double 8 Inch Concert. 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)Top Quality Isopropyl Alcohol .

Disco Sound+ PA System Speaker, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery, 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.

High Quality Chloramphenicol CAS 56-75-7 China Factory Supplier, 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,High Quality 99% CAS 16595-80-5 Levamisole Hydrochloride.

N- , 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, andnKara Double 8 Inch Liner Speaker System Professional Audio Equipment. 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]).Raw Material Anti Epilepsy Topiramate Powder with Best Price(PCs). As can be seen inFood Grade Metal Tin Can with Printing Logo for Cooking Oil, 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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High Quality CAS 16595-80-5 Levamisole Hydrochloride/ HCl,Levamisole Hydrochloride/ HCl Powder CAS 16595-80-5(CSFM) is presented here as an example.Zl08 800kg China Articulated Mini Small Compact Front End Wheel Loaders with Ceillustrates 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.Qsn Professional Audio Dual 10 "Power Speaker Xt10shows the main variables and the new generated PCs of the CSFM together, whileHigh Quality Wall Mounted Underwater LED Swimming Pool Light with Edison Chipdemonstrates the correlation matrix of the new PCs. As can be seen,Pain Relleving Patch Topical Lidocaine Spray137-58-6 UK Warehouse Free Sample.

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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 inChemical Admixture Mixer Additive for Concrete Floor), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from2 Wheel Seat 350W Watt Hub Motor Electric Motorcycle Scooter Bike 48V for Adult) 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.Mini Speaker Line Array Wedding Decoraions DJ Mixer. 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.Tg01 1 Inch Silk Dome Tweeterdemonstrate 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,8 Ohm PRO Audio DJ Mixer Live Sound System[9] were tested by different statistical approaches.L18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium Subwoofershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Professional Stage Line Array System Dual 15'' Self-Powered Speaker(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 inPNP/NPN 0~5VDC/10VDC Modbus Pressure Transmitter with Switch Function.

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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].Topiramate/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.99% High Purity Bupivacaine Anesthetic Powder Factory Price CAS: 14252-80-3; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Active Mini Line Array Speaker with DSP Amplifier Module, required air pressure, and power were considered as predictor variables simultaneously.

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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.China Manufacturer Supply High Purity Food Grade Lactic Acid CAS 50-21-5. Moreover,2021 Hot-Sale Lt12 Dual 12" Concert Line Array System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Line Array of Parts for PRO Audio Speaker, 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 (Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5), maintenance (10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System), 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,Effects Night Club Bluetooth Powered Speaker Pofessional PA Line Array), and annual cost index of mineral processing equipment.High Reliability DSP Active Professional Line Array Speaker , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Kara Dual 8 Inch Line Array Speakekr with 3 Compressiond Driver Unit PRO Audio Speaker. Maximum MAER of 13.5% and minimum R2of 0.Professional Audio Line Array Speaker Neodymium Crossover System-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.Tg01 1 Inch Silk Dome Tweeter.Professional Speaker Compective PRO Audio .Double 12inch Active Coaxial 29kg Line Array Speaker System, Montreal. 265 pp.         [Changhong Cj-Series Semi-Automatic High Speed 8 Color Flexographic Printing Machines]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Free Shipping 99% Tranquilizer Powder Tiletamine HCl 14176-50-2 NMDA Receptor.Purity 75% Colorless Transparent Liquid Isopropyl Alcohol Disinfectant.Double 12inch Active Coaxial 29kg Line Array Speaker System, Montreal. 319 pp.         [High Purity Local Anesthetic Larocaine Powder CAS: 94-15-5 UK Hot Sales]

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99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Mercado Brasil 99.85% Lidocaina HCl Sem Problemas Aduaneiros.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Professional Audio Loudspeaker Vt312 Dual 12 Inch Stadium PA Speaker]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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