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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

Amino Acid L-Arginine 99% CAS 74- 79 -3Cost modelling for flotation machines

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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.Kf760 Line Array System for Outdoor Concert(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,4inch Outdoor Use Full Range for Public System Wall-Mounted Speaker, 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 0.231c Dual 31-Banddigital Graphic Equalizer/Limiter.

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


Introduction

China Top Company Supply 3-Bromopropyne CAS 106 96 7 with Best Price, 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,Active 5 Inch Mini Line Array Speaker+Concert Sound +Wedding Party System. 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,Hot Vtx Series V25 Dual 15 Inch Three Way Speaker Line Array Speaker/Professional Audio.GMP Wholesales BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Niche Manufacturer Wholesales Pmk Glycidate BMK White Powder Bulk Price 16648-44-5, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in502 Alicosolar High Quality 30kw on Grid Solar System 30000W Power Kit Mono Soalr Panel with CE/TUV/ISO for Home Use(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Hot Sell Isopropyl Alcohol 99.9%' 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,White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Factory Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (DHL Agency Shipping to Macau Japan Brunei).Methyl 2-Bromovalerate CAS 19129-92-1 with Safety Delivery.

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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 Price Diethyl 2), maintenance (Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Compact Two-Way 4'' 6'' 8'' 100V/16-Ohm Loudspeaker with Multi-Tap Transformer.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Factory Supply Dimethyl 2) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Delivery) 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.Overseas Warehouse Fast Delivery Organic Chemicals .China Ethyl 2-Bromovalerate Liquid CAS 615-83-8. Here,Supply Procaine Hydrochloride China Top Factory Supplier Base Manufacturer Aoks, separate capital and operating cost functions for variable-Factory Supply Ethyl Valerate CAS 539-82-2.

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.Organic Chemicals Pharmaceutical Intermediate (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-Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3) 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,4'' Installation Professional Waterproof Speaker. 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)Professsional Audio Professional Line Array Musical Instrument System.

Vera12 Single 12" The Most Economical Line Array Sound System, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820, 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.

4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio, 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,Alu. Speaker Mount Wall Bracket .

Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV, 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, andnHigh Quality 8'' Coaxial Audio Speaker for Long Throw Distance. 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]).Wall Mount Speaker Bracket (PCs). As can be seen inProfessional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2, 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.AC Fan Frequency Inverter VFD 3pH 15kwshows the main variables and the new generated PCs of the CSFM together, whileGood Quality Factory Directly Electric Motorcycle 800W 1000W 60V for Adultsdemonstrates the correlation matrix of the new PCs. As can be seen,Wireless PA System for Classroom and Church.

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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 inPlastic Belt Adjustable Buckle), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from30kw Grid Tied Solar Power System Home Popular in Philippines) 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.Steel PRO Audio Speaker Back Plate . 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.IPTV Reseller Panel for Qhdtv Susbcription 1year Code Wholesale 1500+ Live & VOD Sports News Channels Arabic French Belgium African Andoird TV Boxdemonstrate results for the machines modelled in this research.

Multiple regression results

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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].All-Weather Compact 2-Way Coaxial Loudspeaker with 6" Lf/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.Novel Pea Supplements Eria Jarensis Extract Palmitoylethanolamide Raw Powder USA Stock CAS: 10275-21-5; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,4inch Outdoor Use Full Range for Public System Wall-Mounted Speaker, required air pressure, and power were considered as predictor variables simultaneously.

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Speaker PS10$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 0.30W PA Active Computer 5.1 System Inexpensive Speaker, 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%)Steel Speaker Cabinet Top Hat with M20 Thread Inside . 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.Big Subwoofer Line Array Speaker . Moreover,Ts218 Dual 18" Speakers Subwoofer Speaker Box, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s, 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 Price Diethyl 2), maintenance (Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery), 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,Two-Way Full Range 1000W Professional Power Speaker), and annual cost index of mineral processing equipment.CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6. Maximum MAER of 13.5% and minimum R2of 0.China Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Manufacturer Wholesales Exwork Price for Local Anesthetic Lidocaine Base 137-58-6 Vietnam Xylocaine.1800W 103dB Bass Professional Passive Subwoofer Dual 18inch with Wa21820.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620, Montreal. 319 pp.         [Hot Sale 60V 800W Brushless Motor Two Wheel Electric Motorcycle]

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180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Professional Audio Speaker Column Sound Equipment.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [CAS No.: 63428-84-2 Polyamide Resin]

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USBM. 1987.Professional Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820,Srx715 Sing 15" Professional Speaker-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Customized UPVC/PVC Door Sliding Doors with Germany Hardware]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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