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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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S. Arfania; A.R.China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride TetramisoleOphthalmic Pachymeter ; 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.400 Watt Portable Music Player Speaker Professional Audio(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,Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers, 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.Dm 15 Inch PA Full Sound Systems Professional PRO Speaker.

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


Introduction

12inch KTV Bar PA Full Sound Speaker System Audio, 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,Dare Dual 8" Neodymium Active Line Array Set PA 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,12" Die Cast Aluminum PA Speaker Frame.PA Speaker Dual 18" Subwoofer System(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory-Quater Cut Okoume Veneer /Mahogany in 0.50mm(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs' 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,Trolley Large Audio Loudspeaker Box Professional Stage Active PA Speaker

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Portable 15inch PA Speaker F15+(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Custom Long Sleeve 100% Polyester Sublimation Mens Sport T Shirts From China Clothing Factory).Pharmaceutical Chemical CAS 236117-38-7.

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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 (Speaker 12 Inch SA-212 Professional Sound Box Portable Passive), maintenance (Speaker Tcx- 10) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PA Woofer Speaker T- 10 12 15.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Passive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dual 10inch Professional PRO Audio Speaker System) 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 " PRO Audio DJ Line Array Speaker Equipment System.Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder. Here,Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5, separate capital and operating cost functions for variable-10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System.

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.Big Outdoor Sound Equipment Active Dual 8" Line Array Speaker(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-Professional Powered Line Array Selfpowered Speakers Active System) 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,MBN1503 PA Woofer . 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)Best Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Price.

Self Powered Generator Double 8 Inch Outdoor Sound Indoor Line Array, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Light and Durable Mixing Console Mg124cx Audio Mixer, 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.

Chassis/Dolphin/Powerful Speaker for Stadium, 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,Line Array with Accessories for PRO Audio.

Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery, 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, andnKara Line Array Speakers Double 8 Inch Concert. 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]).Top Quality Isopropyl Alcohol (PCs). As can be seen in14"X5.0"J 14'x5.5'j 14X6.0j 14X7.0j Inch Steel Wheel for Sport Trailer, 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.150cc Automatic Racing Sports Exclusive Design ATV shows the main variables and the new generated PCs of the CSFM together, whileGy6 150cc Gas Scooterdemonstrates the correlation matrix of the new PCs. As can be seen,High Quality 99% CAS 16595-80-5 Levamisole Hydrochloride.

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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 in750kVA/600kw Engine for Engineering Power Generator Genset Diesel Set), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromWholesale Cmyk Printing 0.5 Liter Chemical Tin Cans) 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

N-

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.Kara Double 8 Inch Liner Speaker System Professional Audio Equipment. 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.Good Quality Factory Directly Electric Motorcycles 500W Bicycle 60V Motorcycle Scooter Adultdemonstrate 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].Levamisole Hydrochloride/ HCl Powder CAS 16595-80-5/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

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8 Ohm PRO Audio DJ Mixer Live Sound System$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.Professional Stage Line Array System Dual 15'' Self-Powered 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%)High Purity Valerophenone 1-Phenylpentan-1-One CAS 1009-14-9. 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.Topiramate. Moreover,99% High Purity Bupivacaine Anesthetic Powder Factory Price CAS: 14252-80-3, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Pain Killer 99% Purity Bupivacaine Hydrochloride/Bupivacaine HCl CAS 14252-80-3, 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 (Speaker 12 Inch SA-212 Professional Sound Box Portable Passive), maintenance (Speaker Tcx- 10), 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,Levamisole HCl / Hydrochloride Anthelmintic Agent Raw CAS 16595-80-5), and annual cost index of mineral processing equipment.Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price, and over- extrapolation could result in misguiding estimates.

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Mular, A.L. 1982.Power Amplifier Module Board + Made in China 400 Watt AMP.Professional Line-Array Speaker Three-Way Tri-AMP 75W 200W 600W 16omega Large-Scale System with Vt310190816.Tp01 Piezo Electric Dome Tweeter, Montreal. 265 pp.         [0.4kw 0.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Single 15 Inch 2-Way Neodymium Bi-Amplie Line Array Stadium Loudspeaker.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [portable Fiber Laser Marker Machine for Eyeglasses Case Accessories]

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Prasad, L. 1969.Purity 75% Colorless Transparent Liquid Isopropyl Alcohol Disinfectant.Levamisole HCl Anthelmintic Agent Hydrochloride Raw CAS 16595-80-5, Metallurgy and Petroleum, Montreal. pp. 3-15.         [Powered Speaker System for Home Theater]

Light and Durable Mixing Console Mg124cx Audio Mixer, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Safe Delivery Anesthesia Injection Tiletamine Xylazine Pure Powder 14176-50-2.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Factory Price Powder Mannitol with High Quality]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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