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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

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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.Factory Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8(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,Methyl 2-Bromovalerate CAS 19129-92-1 with Safety Delivery, 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.Factory Price Diethyl 2.

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


Introduction

Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery, 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,Compact Two-Way 4'' 6'' 8'' 100V/16-Ohm Loudspeaker with Multi-Tap Transformer. 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 Dimethyl 2.99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Delivery(Khalesiet al.,2015).

Overseas Warehouse Fast Delivery Organic Chemicals .China Ethyl 2-Bromovalerate Liquid CAS 615-83-8et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for GMP Wholesales BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6(Smith and Mason, 1997).Supply Procaine Hydrochloride China Top Factory Supplier Base Manufacturer Aoks(Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl). One of the preliminary works was undertaken by Prasad (1969)Factory Supply Ethyl Valerate CAS 539-82-2, Khalesi, and Khosfarman (2014).Organic Chemicals Pharmaceutical Intermediate ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3, the role of other effective parameters has simply been overlooked.4'' Installation Professional Waterproof Speaker. Furthermore,Professsional Audio Professional Line Array Musical Instrument System, 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-Vera12 Single 12" The Most Economical Line Array Sound System.180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820(SRA) and multiple regression (MRA) cost functions are presented.4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio. 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 (Alu. Speaker Mount Wall Bracket , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNew Cooling Fast Racing Motorcycle 400cc 250cc Efi System 150km/H(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV' 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,Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208t

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Wireless PA System for Classroom and Church, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Pure Grey Black Artificial Quartz Stone for Kitchen Countertop).Steel PRO Audio Speaker Back Plate .

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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 (Hop Quality and Competitive Price Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa), maintenance (Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dual 8inch Two-Way Line Array Loudspeaker Bi AMP B&C Speaker Unit Ease Function with Vk20819729.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (All-Weather Compact 2-Way Coaxial Loudspeaker with 6" Lf) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Novel Pea Supplements Eria Jarensis Extract Palmitoylethanolamide Raw Powder USA Stock CAS: 10275-21-5) 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.Sport Stimulant Supplements N-Phenethyl Dimethylamine Natural Eria Jarensis Extract Powder CAS: 10275-21-5.Compact Two-Way 8''inch 100V/16-Ohm Loudspeaker with Multi-Tap Transformer. Here,Speaker PS10, separate capital and operating cost functions for variable-30W PA Active Computer 5.1 System Inexpensive Speaker.

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.Steel Speaker Cabinet Top Hat with M20 Thread Inside (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 Subwoofer 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,Ts218 Dual 18" Speakers Subwoofer Speaker Box. 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)Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s.

Two-Way Full Range 1000W Professional Power Speaker, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical, 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.

Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6, 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 Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149.

Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse, 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, andnCAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical. 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]).Tetracaine Ophthalmic Solution Quick Reaction White Powder USA Warehouse CAS: 94-24-6(PCs). As can be seen inLine Array of Parts for PRO Audio Speaker, 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.Factory Provide Top Quality L-Carnitine Fumarate 99% 90471- 79 -7shows the main variables and the new generated PCs of the CSFM together, while488 Alicosolar High Quality 20kw on Grid Solar System 20000W Kit Mono Soalr Panel with CE/TUV/ISO for Home Usedemonstrates the correlation matrix of the new PCs. As can be seen,Neodymium 12inch 932lap Professional Powered DSP Line Array Speaker.

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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 inP5 Advertising LED Display Screen for Indoor Video Wall), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromBlue Masterbatch for Film) 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.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220. 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.Sapele Veneer Plywood Sheet for Wood Furniture and Decorationdemonstrate 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,New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820[9] were tested by different statistical approaches.Motorcyle for Both Oil and Water Coolingshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Recording Studio Equipment Vera Series Super Power Speaker Box(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 in1.3MP Ahd CCTV DVR Kits 16CH Standalone Network with Surveillance Camera Security System.

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Cost model for variable-New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620

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].Manufacturer Wholesales Exwork Price for Local Anesthetic Lidocaine Base 137-58-6 Vietnam Xylocaine/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.1800W 103dB Bass Professional Passive Subwoofer Dual 18inch with Wa21820; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Methyl 2-Bromovalerate CAS 19129-92-1 with Safety Delivery, required air pressure, and power were considered as predictor variables simultaneously.

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Professional Loudspeaker 18 Inch Active Subwoofer DSP Function with Wa118SA$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.Outdoor PRO Audio Loudspeaker, 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%)Doule 8'' Mini Line Arry Loudspeaker. 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.Waterproof Loudspeaker Wall Mounter 15inch Mq-15cp. Moreover,Vera12 New Design 800watts 12" Audio System Line Array, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Single 15 Inch High Quality Bass, 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 (Hop Quality and Competitive Price Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa), maintenance (Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730), 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,Professional Audio Speaker Column Sound Equipment), and annual cost index of mineral processing equipment.Professional Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Srx715 Sing 15" Professional Speaker. Maximum MAER of 13.5% and minimum R2of 0.Aclon DSP3500 Professional DJ Sound Speakers DSP Powered Line Array-feasibility and even feasibility study level of projects.

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Khalesi, M. R., Zarei, M. J.,White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-Peq-18SD1 18'' Bass Reflex Active Powerful Subwoofer.Minerals Engineering,vol. 81. pp. 103-108.         [CAS No.: 63428-84-2 Polyamide Resin]

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Lashgari, A.Theater Professional Line Array Speaker, A.R. 2013.15' Water-Proof Installation Long-Throw Speaker with 100V Transformer,Guangzhou Skytone Vera S18 18'' New Design Line Array Subwoofer,vol. 23. pp. 441-446.         [0805 Single Color Green Chip LED SMD with RoHS]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Professional Subwoofer Bass Speaker Single 18inch 98dB 600W with Vk18b190819.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [E3/L3 17.5-25 20.5-25 1800-25 Durable Tyres for Scrapers]

Noakes, M. and Lanz, T. 1993.Srx715 Single 15" Speaker Cabinet PRO Audio System.Vera 12 Loudspeaker Line Array Speaker System, Carlton, victoria. 412 pp.         [Food Grade Vitamin a Oil Palmitate 1.7million Units. CAS79-81-2]

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CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Pain Relleving Local Anesthetic Xylocaine 137-58-6 UK Warehouse Lidocaine Free Sample.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [100 PCS High Quality Resealable Hair Top Wig Clear Transparent Ziplock Bag Plastic Food Packaging for Oil]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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