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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

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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.Dual 10inch Powerful Line Array Speaker Ds210(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,Hot Sale Free Sample CAS 302- 79 -4 Retinoic Acid with Best 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.Dual 10 Inch Top and Double 15 Bass Portable Multi-Functional Line Array Speaker System.

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


Introduction

Cheap Price PRO Sound Professional Audio 10 Inch Speakers 200W, 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,Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease with Fast Delivery. 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,Cold&Heat Seal Plastic Film Roll Chocolate Bar Food Cookies Packaging Bag Frosted Zipper Container Made Craft Drawstring Low MOQ Printing.New Design Beyma Driver Imported Spanish Professional Curve Line Array Speaker Two-Way Bi-AMP Dual 10 Inch110W 500W Ease Technology with Vk210(Khalesiet al.,2015).

10 Inch Coaxial Speaker Professional Driver 250wrms " Subwoofer.Aicrowe L- et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker(Smith and Mason, 1997).Diase PRO Audio Dual 10inch Professional Line Array 700W(Water Proof Closed Box Delivery Tricycle). One of the preliminary works was undertaken by Prasad (1969)PS10 High Power 10 Inch Monitor PA Speaker for Live Performance, Khalesi, and Khosfarman (2014).Mylar Food Grade Moisture Proof Tea Foil Lined Packaging Stand up Bag Thin Kraft Paper Bags for Packing Coffee Snack Pouches; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Food Grade Vitamin a Palmitate Powder CAS 79 -81-2, the role of other effective parameters has simply been overlooked.Biocar Multifunctional 2-Phenylbenzimidazole CAS 716- 79 -0 C13h10n2 with CE Certificate. Furthermore,Local Anesthetics Dibucaine Pharma Raw Powder CAS 85- 79 -0, 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-10AA50-1 RMS 200 Watts 10 Inch Full Range Woofer with.High Quality 98% Acrylamid Powder CAS 79 -06 1(SRA) and multiple regression (MRA) cost functions are presented.Plastic Laminated Bio Black White Craft Zipper Yemek Paketleme Paper Kraft Packaging Ziplock Bags for Coffee Food. 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 (Food Grade Lactic Acid 79 -33-4, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inThree Phase 380V Small Frequency Converter(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Wholesale Top Quality Retinoic Acid/Retinoic Acid Powder/Tretinoin Powder/Vitamin a CAS 302- 79 -4' 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,Custom Plastic Food Contact Packaging Bags

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 10 Inch 600W High-End Stage Line Array PRO Audio, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Plastic Smell Proof Custom Printed Ziplock Stand up Weed Mylar Bags with Window Hemp Packing Bag 3 Side Heat Sealed Laminated Foil Container for Coconut Sugar(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Global Sunrise Solar Lamp with USB Charger/Cable for Camping/Outdoor/Research).Child Resistant Stand up Exit Bag.

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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 (Plastic Mylar Customize Container Food Grade Zip Stand-up Pouch Packaging Bag with Clear Window), maintenance (Single 10 Inches Passive/Active Full-Range Professional Loudspeaker) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Custom Zip Bag Plastic Stand-up Pouch Sweet Child Proof.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Combo Speaker Professional Loudspeaker /Doule 10'' Line Array System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (PRO Audio Speaker Dual 10 Inch Professional DSP Active Line Array) 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.10 " Professional Stage Performance Audio PA Trolley Wireless Bluetooth Active Speaker.Single 10 Inch 2 Way Mini Portable Line Array Speaker. Here,China Factory Supply CAS 79 -03-8 Propionyl Chloride with Best Quality, separate capital and operating cost functions for variable-Pharmaceutical Chemical 1-Hydroxypyrene CAS 5315- 79 -7.

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 Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery(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-Polymer Science 2-Phenylbenzimidazole CAS 16- 79 -0) 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,High Quality Custom Printed Pet Food Packaging Bags. 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)Clothes /Cosmetics Plastic Packaging PP Bags PEVA/OPP/ CPE/ Pvf Shoes Shirt Storage Stock Self Heat Sealing.

Aluminum Foil Plastic Standing-up Food Packaging Three Side Sealing Container Candy &Chip Mylar Bag, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Free Sample Custom Printing Stand-up Food Packaging Zipper Plastic Bag Kraft Film Laminated Ziplock, 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.

Amino Acid L-Arginine 99% CAS 74- 79 -3, 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,Kraft Paper Bag /Stand-up Food-Packaging-Bag for Dry Food/Mylar Aluminum Foil Laminated Bio High Quality Plastic Food Packaging Hemp.

Matt Food Packaging Child Proof Zipper Plastic Stand up Pouch Water &Air & Smelly Kraft Film Laminated Food&Tea&Coffee&Candy Bag, 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, andnGlossy & Matte Plastic Flat Bag Three Side Sealing Aluminum Foil with Tear Notch &Ziplock Silver Food Packaging Pouch for Food&Hemp&Tea Smell Resistant. 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]).Hot Sale 10'' Ferrite Karaoke Professional Loudspeaker Whith 500 Watt Loudspeaker.(PCs). As can be seen in20W 30W Handheld Vin Number Metal Logo Laser Marking Machine, 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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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.Mini Dumper Wolf Wl80 Loader with CEshows the main variables and the new generated PCs of the CSFM together, whileMini Speaker Line Array Wedding Decoraions DJ Mixerdemonstrates the correlation matrix of the new PCs. As can be seen,ESD Shielding Anti Static Aluminum Foil Laminated LLDPE Bag for Electronic Parts /LED Lighting Packing.

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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 inJapanese ISO Circular Soaking Acrylic Bath Tub with Overflow), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Safe Automatic CVT 150cc Go Kart Motor with Reverse) 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 0.2021 New Compact 10 " Active Line Array Speaker Sound System. 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.Line Array Speaker Professional PA System Two Way Full Rang Passive demonstrate 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,Waterproof Dual 10 " Three Way Line Array Professional Audio Speaker System[9] were tested by different statistical approaches.Dsola Customized High Heat Resistance 2 Pins Mc4 Solar Connectorshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.PE Dog Food Pouch with Hole(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 Soak off UV Nail Polish Gel Salon.

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Cost model for variable-Dual 10 Inch Line Array for Concert Live Service

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].Professional Loudspeaker 10'' PRO Audio Speaker Passive Line Array System/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.Double 10'' Compact Active Line Array; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Hot Sale Free Sample CAS 302- 79 -4 Retinoic Acid with Best Quality, required air pressure, and power were considered as predictor variables simultaneously.

CAS: 13553- 79 -2; Rifamycin S. Moreover, the operating cost was detailed in different cost items.PE/ PA /CPP Food Vacuum Packing Bag Plastic Grade, indicated in10 Inch Coaxial Speaker Professional Driver 250wrms " Line Array, and major extrapolation should be avoided.

Fast Delivery CAS 525- 79 -1 6-Furfurylaminopurine 99% with Best Price$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.Factory Supply Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery, 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%)99% Purity 1-Bromo-3. 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.Pharmaceutical Intermediate 1. Moreover,CAS 643- 79 -8 O-Phthalaldehyde / Phthalaldehyde with Best Price, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Factory Supply  2-Phenylbenzimidazole  CAS 716- 79 -0 with Best Price, 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 (Plastic Mylar Customize Container Food Grade Zip Stand-up Pouch Packaging Bag with Clear Window), maintenance (Single 10 Inches Passive/Active Full-Range Professional Loudspeaker), 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,O-Phthalaldehyde CAS 643- 79 -8), and annual cost index of mineral processing equipment.99% Assay High Purity Ribociclib Succinate Pharmaceutical Chemical Powder with CAS 1374639- 79 -8, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Pharmaceutical Intermediate CAS 702- 79 -4 99% Pure 1. Maximum MAER of 13.5% and minimum R2of 0.Dimethylthiotoluene Diamine-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

China Supplier 1Free Sample 5GHz Antenna Rubber GainCorresponding author

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