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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.Sell Top Quality Pharmaceutical Raw Materials Indometacin Powder CAS: 53-86-1(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,Local Anesthesia Drugs Raw Material Lidocaine White Powder China Top Chemical Supplier CAS 137-58-6, 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.BMK New Arrival High Quality Glycidic Acid CAS 16648-44-5.

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


Introduction

Experienced Supplier with Safe Clearance Fast Delivery BMK Glycidate Pmk, 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,Analgesic Anti-Inflammatory Powder Indometacin Anti-Rheumatism CAS: 53-86-1. 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,Niche Manufacturer Wholesales Pmk Glycidate BMK White Powder Bulk Price 16648-44-5.Hot Sell Isopropyl Alcohol 99.9%(Khalesiet al.,2015).

Speaker Wall Bracket White/Black .High Security Door Peephole Eyes Viewer DV3828b et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Dual 10 Inch Line Aray Powered Active Sound System(Smith and Mason, 1997).Free Sample Factory Wholesales BMK Glycidate Europe Safe Delivery White Powder(Wholesale 1.5 mm Natural Bamboo Skateboard Veneer with Best Price). One of the preliminary works was undertaken by Prasad (1969)Professional Column Speaker Line Array Full Range Loudspeaker Multi-Function L3, Khalesi, and Khosfarman (2014).Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk, the role of other effective parameters has simply been overlooked.Factory Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8. Furthermore,Methyl 2-Bromovalerate CAS 19129-92-1 with Safety Delivery, 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-Factory Price Diethyl 2.Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery(SRA) and multiple regression (MRA) cost functions are presented.Compact Two-Way 4'' 6'' 8'' 100V/16-Ohm Loudspeaker with Multi-Tap Transformer. 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 (Factory Supply Dimethyl 2, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSpeaker Wall Bracket White/Black (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Delivery' 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,Organic Chemicals Pharmaceutical Intermediate

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),4'' Installation Professional Waterproof Speaker(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High quality supply 95% TC CAS No. 71283-80-2 Fenoxaprop-P-Ethyl).Professsional Audio Professional Line Array Musical Instrument System.

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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 (Vera12 Single 12" The Most Economical Line Array Sound System), maintenance (180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Alu. Speaker Mount Wall Bracket ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV) 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.High Quality 8'' Coaxial Audio Speaker for Long Throw Distance.Wall Mount Speaker Bracket . Here,Professional Outdoor Speaker All Weather Water-Proof Humidity Proof Functions Two Ways with Mq6tp190801, separate capital and operating cost functions for variable-Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801.

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.Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208t(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-Wireless PA System for Classroom and Church) 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,All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf. 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)Steel PRO Audio Speaker Back Plate .

Hop Quality and Competitive Price Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730, 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.

Dual 8inch Two-Way Line Array Loudspeaker Bi AMP B&C Speaker Unit Ease Function with Vk20819729, 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,All-Weather Compact 2-Way Coaxial Loudspeaker with 6" Lf.

Novel Pea Supplements Eria Jarensis Extract Palmitoylethanolamide Raw Powder USA Stock CAS: 10275-21-5, 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, andnSport Stimulant Supplements N-Phenethyl Dimethylamine Natural Eria Jarensis Extract Powder CAS: 10275-21-5. 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]).Compact Two-Way 8''inch 100V/16-Ohm Loudspeaker with Multi-Tap Transformer(PCs). As can be seen inChina Suppliers Alone Type Wraped Beam Disc Machenism Padlock, 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.Hot Sell Good Quality Best China Manufacturer Factory Price Transvaginal Probe Type Wireless Mini Ultrasound Scannershows the main variables and the new generated PCs of the CSFM together, whileVFD Air Compressor Asynchronous Variable Frequency Drivedemonstrates the correlation matrix of the new PCs. As can be seen,Big Subwoofer 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 in3'' 10W Recessed Downlight), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromManufacture! OEM Komatsu PC50uu-2 Bucket Cyl Seal Ket) 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.Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s. 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.Quad Core Media Player Mxq PRO S905W Android Best Kodiiptv Set Top Box TV with SIM Card Slotdemonstrate 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,Two-Way Full Range 1000W Professional Power Speaker[9] were tested by different statistical approaches.Amlogic Chipset S905X2 Quad Core Android8.1 4K Smart Internet TV Box T95qshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical(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 inEn 60309 16A Yellow Outdoor Plug Socket with PVC Tail.

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Cost model for variable-Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6

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].China Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149/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.Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Local Anesthesia Drugs Raw Material Lidocaine White Powder China Top Chemical Supplier CAS 137-58-6, required air pressure, and power were considered as predictor variables simultaneously.

CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical. Moreover, the operating cost was detailed in different cost items.Tetracaine Ophthalmic Solution Quick Reaction White Powder USA Warehouse CAS: 94-24-6, indicated in55inch wall mount LCD panel surveillance LED video, and major extrapolation should be avoided.

Single 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5c$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.High Qualty Line Array 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%)DSP Active Line Array Speaker. 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.Neodymium 12inch 932lap Professional Powered DSP Line Array Speaker. Moreover,8in 8out Professional DSP Matrix Digital Audio Processors with Dp-0808date20, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220, 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 (Vera12 Single 12" The Most Economical Line Array Sound System), maintenance (180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820), 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,New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820), and annual cost index of mineral processing equipment.Recording Studio Equipment Vera Series Super Power Speaker Box, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620. Maximum MAER of 13.5% and minimum R2of 0.Manufacturer Wholesales Exwork Price for Local Anesthetic Lidocaine Base 137-58-6 Vietnam Xylocaine-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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