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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

Skin Care Raw Material Vitamin a Palmitate PowderCost modelling for flotation machines

S. Arfania; A.R.Lucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public AddressVitreous Hemorrhage ; 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.Glycine Methyl Ester Hydrochloride (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,Isoquinoline-5-Sulphonyl Chloride Hydrochloride CAS 105627- 79 -0, 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.Vitamin a Palmitate 1.0m.

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


Introduction

High Purity 99% Oxalyl Chloride with Good Quality, 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,2-Cyclohexylethanol . 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,L-Pyroglutamic Acid.Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !(Khalesiet al.,2015).

Vitamin a Palmitate Powder 500 Cws-Gfp.L-Pyroglutamic Acidet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 4seats 1500cc Kart(Smith and Mason, 1997).China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price(Dual 10inch Powerful Line Array Speaker Ds210). One of the preliminary works was undertaken by Prasad (1969)Supply High Purity Oxalyl Chloride CAS: 79 -37-8, Khalesi, and Khosfarman (2014).Fatory Supply Thiosemicarbazide CAS 79 -19-6; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Quality Retinoic Acid , the role of other effective parameters has simply been overlooked.High Quality 98% Tretinoin . Furthermore,Selling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price, 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-Sugammadex Sodium CAS 343306- 79 -6 Manufacturer and Supplier.Pharmaceutical 1% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free(SRA) and multiple regression (MRA) cost functions are presented.Rifamycin S 96% CAS: 13553- 79 -2. 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 (Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inUltra Low Nosie 10 Channles Mixer Mixing Console (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Quality Hydroxyacetic Acid Glycolic CAS 79 -14-1 Cosmetic Grade' 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,High Purity Amino Acid L-Arginine Powder

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Potassium 2, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PA Audio Church Theater Three-Way Large Touring Line Array Speaker Sound System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Luxury Shiny Red Color Cosmetic Plastic Lotion Pump Bottles with High Quality 20ml 30ml 50ml).Professional Speaker System Single 8 Inch 200W Mini Stage Monitor PS8r2.

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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 (Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0), maintenance (Professional Audio Speaker Active Single 8 Inch Mini Stage Monitor PS8r2) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Professional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Speaker System Single 15 Inch High Power Line Array Aw15) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio) 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.Sinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered.Hench Hot Sales Raw Material Powder Oxytetracycline. Here,New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1020, separate capital and operating cost functions for variable-Natural Weight Loss Supplements Huperzine a Powder CAS: 120786-18-7 USA Hupa Sample Free.

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.Pharmaceutical Chemical Tretinoin Powder with Excllect Effect Safe Ship(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-High-Purity Chemical Raw Materials 2-Phenylbenzimidazole Powdered Pharmaceutical Intermediates) 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,2-Aminoanthraquinone CAS No 117- 79 -3. 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)Food Additives L-Arginine with Low Price.

Latest Product Powder 2-Phenylbenzimidazole Chemical Raw Material, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Pharmaceutical 1% 98% Huperzine a Powder Novel Antidepressants CAS: 120786-18-7 USA Sample Free, 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.

China Supply 1, 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,China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3.

Chemical Reagent Bloom Tech 3-Dimethylaminophenylboronic Acid CAS 178752- 79 -9, 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, andnSafe Shipping with Good Price Tretinoin Powder. 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]).Dpc Diphenyl Carbonate CAS 102-09-0(PCs). As can be seen inYineng Yn725 Mini Wheel Loader 18.5kw Cabin, 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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100% Water Soluble Vitamin a Palmitate Powder Retinyl,China Supplier of CAS 702- 79 -4 1(CSFM) is presented here as an example.China High Purity Pharmaceutical Intermediate CAS 85- 79 -0 Cinchocaine with Competitive Priceillustrates 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.No Flicker Glare Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Edison Chipshows the main variables and the new generated PCs of the CSFM together, whileSimple Upholstered Copper Nail Vintage Style Velvet Lounge Sofademonstrates the correlation matrix of the new PCs. As can be seen,Free Sample CAS 32780-32-8 PT141 PT 141 10mg Peptide Raw Lyophilized Powder.

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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 inWaterproof Durable Healthy 4.5mm Click Vinyl PVC Spc Flooring), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from10 " PRO Audio DJ Line Array Speaker Equipment System) 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.CAS 79 -57-2 Oxytetracycline. 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.Variable Frequency Drive VFD Supplier AC Converter 50Hz to 60Hz with Vector Controldemonstrate 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,Azd3759 CAS No. 1626387-81-2[9] were tested by different statistical approaches.500ml 16oz Round Metal Glue Tin Can with Screw Top Brush for Chemicalshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Food Additives L-Arginine with Top Quality(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 inCustomized Cute Cartoon Mini Figurine Keychains Toy for Children.

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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].99% Purity 1/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.PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Isoquinoline-5-Sulphonyl Chloride Hydrochloride CAS 105627- 79 -0, 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.High Fidelity Professional Line Array Speaker . Moreover,N, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Vitamin a Palmitate CAS 79 -81-2, 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 (Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0), maintenance (Professional Audio Speaker Active Single 8 Inch Mini Stage Monitor PS8r2), 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,IP PA System 6 Inch 15W SIP Poe Ceiling Speaker with Built-in Monitoring Microphone and Dry Contact in out), and annual cost index of mineral processing equipment.Best Price Diclofenac Sodium with High Quality, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,40wx2 10 " Portable PS Series Party Speaker. Maximum MAER of 13.5% and minimum R2of 0.100% CAS 79 -57-2 Oxytetracycline Powder-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

China 300cc Adult Road Legal 2 Seat Pedal Go KartYn725g Yineng Mini Wheel LoaderCorresponding author

Creative Commons LicenseÂAll the contents of this journal, except where otherwise noted, is licensed under a850 Alicosolar 5kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage