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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
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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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S. Arfania; A.R.Professional Column Speaker Line Array Full Range Loudspeaker Multi-Function L3DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional; 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.Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery(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,White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk, 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 Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8.

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


Introduction

Methyl 2-Bromovalerate CAS 19129-92-1 with Safety 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,Factory Price Diethyl 2. 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,Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery.Compact Two-Way 4'' 6'' 8'' 100V/16-Ohm Loudspeaker with Multi-Tap Transformer(Khalesiet al.,2015).

Factory Supply Dimethyl 2.99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Deliveryet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for CAS No. 151103-09-2 4- (Smith and Mason, 1997).Overseas Warehouse Fast Delivery Organic Chemicals (IPTV Reseller Panel for Qhdtv Susbcription 1year Code Wholesale 1500+ Live & VOD Sports News Channels Arabic French Belgium African Andoird TV Box). One of the preliminary works was undertaken by Prasad (1969)China Ethyl 2-Bromovalerate Liquid CAS 615-83-8, Khalesi, and Khosfarman (2014).Supply Procaine Hydrochloride China Top Factory Supplier Base Manufacturer Aoks; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Factory Supply Ethyl Valerate CAS 539-82-2, the role of other effective parameters has simply been overlooked.Organic Chemicals Pharmaceutical Intermediate . Furthermore,Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3, 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-4'' Installation Professional Waterproof Speaker.Professsional Audio Professional Line Array Musical Instrument System(SRA) and multiple regression (MRA) cost functions are presented.Vera12 Single 12" The Most Economical Line Array Sound System. 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 (180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inVeterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio' 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,Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208t(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Fashion Clothing Men's Knitted Sweater with V-Shaped Intarsia and Reversible Zipper).Wireless PA System for Classroom and Church.

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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 (All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf), maintenance (Steel PRO Audio Speaker Back Plate ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hop Quality and Competitive Price Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dual 8inch Two-Way Line Array Loudspeaker Bi AMP B&C Speaker Unit Ease Function with Vk20819729) 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.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. Here,Sport Stimulant Supplements N-Phenethyl Dimethylamine Natural Eria Jarensis Extract Powder CAS: 10275-21-5, separate capital and operating cost functions for variable-Compact Two-Way 8''inch 100V/16-Ohm Loudspeaker with Multi-Tap Transformer.

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.Speaker PS10(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-30W PA Active Computer 5.1 System Inexpensive 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,Steel Speaker Cabinet Top Hat with M20 Thread Inside . 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)Big Subwoofer Line Array Speaker .

Ts218 Dual 18" Speakers Subwoofer Speaker Box, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s, 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.

Two-Way Full Range 1000W Professional Power Speaker, 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,CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical.

Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6, 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, andnChina Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149. 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]).Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse(PCs). As can be seen inFactory Produce Natural Face Veneer Size 1220X1830X0.25mm, 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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Tetracaine Ophthalmic Solution Quick Reaction White Powder USA Warehouse CAS: 94-24-6,Single 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5c(CSFM) is presented here as an example.Medrogestone Top Quality Low Price 977- 79 -7illustrates the high correlation between predictor variables for the CSFM.

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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.New Zl08 Mini Radlader with Hydraulic Transmissionshows the main variables and the new generated PCs of the CSFM together, whileFactory Provide Top Quality L-Carnitine Fumarate 99% 90471- 79 -7demonstrates the correlation matrix of the new PCs. As can be seen,High Qualty Line Array Loudspeaker.

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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 inNail Polish), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromNitrogen Fertilizer N21% Min Ammonium Sulphate White Granular) 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.Neodymium 12inch 932lap Professional Powered DSP Line Array Speaker. 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.New Driver Beyma Professional Speaker Line Array PA System Single 18" Sub Bass Subwoofer with Wa218PROdemonstrate 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,8in 8out Professional DSP Matrix Digital Audio Processors with Dp-0808date20[9] were tested by different statistical approaches.Sapele Veneer Plywood Sheet for Wood Furniture and Decorationshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220(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 inTouchless Wheel Alignment with Clamping System Wa061.

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Cost model for variable-New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820

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].Recording Studio Equipment Vera Series Super Power Speaker Box/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.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk, required air pressure, and power were considered as predictor variables simultaneously.

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Line Array Horn of Professional Audio 170L*160W*140h 1" $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.Single 18'' Low Frequency Sub-Bass, 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%)Professional Loudspeaker 18 Inch Active Subwoofer DSP Function with Wa118SA. 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.Outdoor PRO Audio Loudspeaker. Moreover,Doule 8'' Mini Line Arry Loudspeaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Waterproof Loudspeaker Wall Mounter 15inch Mq-15cp, 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 (All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf), maintenance (Steel PRO Audio Speaker Back Plate ), 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,Vera12 New Design 800watts 12" Audio System Line Array), and annual cost index of mineral processing equipment.Single 15 Inch High Quality Bass, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Professional Audio Speaker Column Sound Equipment. Maximum MAER of 13.5% and minimum R2of 0.Professional Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820-feasibility and even feasibility study level of projects.

References

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Mular, A.L. 1982.Double 6inch Powered Line Array Speaker.Factory Export 99% Purity Chlorhexidine CAS55-56-1 with Lowest Price.Free Clearance Surface Anesthesia of Eyes, Montreal. 265 pp.         [Top Grade Cross-Country Motorcycle Tire 120/90-18]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Free Clearance USP40 Tetracaine Base Skin Surface Anesthesia Pain Reliever Cream CAS: 94-24-6.High Purity 9-Hydroxyfluorene CAS 1689-64-1 with Good Price in Stock.Free Clearance Surface Anesthesia of Eyes, Montreal. 319 pp.         [Sunpal 150kw Solar Grid Tied System Low Price]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.CAS No.: 67-63-0 Isopropyl Alcohol 99.9%/Ipa 99.9%/Isopropanol 99.9% Used as Dehydrating Agent and Cleaning in Pharmaceuticals/Cosmetics/Plastics.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [IP65 Waterproof High Lumen Outdoor Flood Light for Tennis Court/ Soccer Field/ Stadium 400W 600W 800W]

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Prasad, L. 1969.Single 15" Plastic Powered Speaker.Veterinary Grade Petcare Products Anesthesia Cream Topical Lidocaine Spray137-58-6 UK Warehouse, Metallurgy and Petroleum, Montreal. pp. 3-15.         [CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film Sunmide]

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USBM. 1987.CAS No.: 67-63-0 Isopropyl Alcohol 99.9%/Ipa 99.9%/Isopropanol 99.9% Used as Pharmaceutical Intermediate,Pain Relleving Local Anesthetic Xylocaine 137-58-6 UK Warehouse Lidocaine Free Sample-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Automatic Moving Hydraulic Pressure Hollow Block Brick Making Machine for Sale in USA]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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