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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.Top Quality and Best Price for Isopropyl Alcohol 99.9%(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,Bp Grade Benzyl Benzoate 99% Min, 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.Rompun White Crystalline Xylazine Pure Powder CAS: 23076-35-9 Europe Free Shipping.

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


Introduction

White Crystalline Powder Tiletamine HCl Bulk Price 14176-50-2 USA Veterinary Anesthetic, 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,Mule Deer Tranquilizer First Choice Tiletamine HCl Injection Free Sample 14176-50-2. 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,High Purity Ethylamine HCl.Steel Circle for PA Speaker Parts 16*3h (Khalesiet al.,2015).

PA Speaker Cabinet Accessories .Professional Audio Loudspeaker PA Stage Active Line Arrayet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2021 New Machine Grade CO2 Laser Marking with a Discount(Smith and Mason, 1997).PA Speaker Accessories and Parts (9mm E1 Glue Bintangor Plywood Board). One of the preliminary works was undertaken by Prasad (1969)PA System with Rigging Shackle Hardware Parts M25 , Khalesi, and Khosfarman (2014).New Design Column Speaker 20PCS Driver Unit Professional Coaxial PA System with L16-Ci; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Professional Self-Powered Subwoofer Indoor Outdoor PA Sstem DSP Bass Speaker Vk10SA, the role of other effective parameters has simply been overlooked.Power Column Speaker PA System. Furthermore,Speaker Wall Mounting Bracket , 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-Single 18'' High Power Speaker Subwoofer.Single 15inch Two Ways Full Range Loudspeaker Perfessional PA System Disco Event 450W with Ks15190802(SRA) and multiple regression (MRA) cost functions are presented.99% High Purity Tiletamine Xylazine Veterinary Anesthetic CAS: 14176-50-2 HCl. 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 (Chinese Top Veterinary Anesthesia Injection Solution Xylazine Hydrochloride Wholesales CAS: 23076-35-9, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inGood Packed Bottle PE Film Shrink Wrapping Machine China(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Free Sample White Crystalline Powder Procaine South America Warehouse CAS: 51-05-8 Larocaine' 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,Battery-Powered PA Multimedia USB Radio Speaker Outdoor Use

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Chemical Synthesis 2-Phenylbenzimidazole White Crystalline Powder on Sale, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Active Compact Column PA Speaker Powered Loudspeaker Point Source(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Manufactory Direct KN95 Protection Masks).PA Speaker Sound System Dual 8'' Two-Way Line Array.

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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 (Wall Amplifier Bluetooth Home Theater Amplifiers Mini with 6'' in Ceiling Speaker Audio Amplificador AMP Bgm Bacground Music Host Wireless Remote Control), maintenance (12"Neodymium Loudspeaker for Line Array Speakers or PA in Professional Audio Equipments) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PRO Audio with Tweeter Horn for Line Array .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Manufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Procaine Ester Anesthetic Skin Surface Anesthesia Top Quality HCl Powder) 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.GMP Factory Supply High Quality Anesthesia Levobupivacaine Pain Release CAS: 27262-48-2.Professional Audio Loudspeaker Vt312 Dual 12 Inch Stadium PA Speaker. Here,Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0, separate capital and operating cost functions for variable-Buy Real Local Anesthetic Pure Powderr Niche Larocaine Free Shipping Europe CAS: 94-15-5.

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.High Purity Local Anesthetic Larocaine Powder CAS: 94-15-5 UK Hot Sales(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-Safe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse) 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,Free Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5. 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)Speaker Wall Mount Bracket for PRO Audio Steel 134.8L*90W*160h .

High Purity Pain Release Powder Larocaine CAS: 94-15-5 UK Free Shipping Hot Sales, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (New Design Source Column Speaker 6X6.5inch B&C Imported Driver Unit PA Line Array Subwoofer with Novi, 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.

New Professional Coaxial Line Array Column Speaker 20PCS Driver Unit PA System with L16-Ci, 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,PA System Single 18" Sub Bass Speaker Low Pitch Subwoofer with Wa118.

Home Theater PA PRO Audio Speaker, 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, andnPA Speaker Dual 8 Inch PRO Audio Professional Line Array 18inch Passive/Active Powered Subwoofer. 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]).Professional Audio Kara Line Array(PCs). As can be seen inHot Wholesale 1L /2L/3L Laundry Liquid Detergent Bottle, 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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Manufacturers Supply Top Quality High Purity Bupivacaine Powder with Best Price CAS: 14252-80-3,Professional Audio Signal 8" Two-Way Full-Range Speakers PA System with Tq8(CSFM) is presented here as an example.MBN1503 PA Woofer illustrates 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.Cafe Bar Table Wrought Iron Home Living Room Diningshows the main variables and the new generated PCs of the CSFM together, whileHigh Purity Retinol Palmitate Powderdemonstrates the correlation matrix of the new PCs. As can be seen,Fdb Audio Double 6 Inch Line Array Speaker Professional Outdoor PA System.

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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 inNature Series Artificial Engineered Quartz Stone for Vanity Top /Island/ Benchtop), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from15-20 Inch Quality Auto Alloy Wheels 4*4 Wheel for Trailer) 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.Cheap Price Speaker Wall Mount Bracket . 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.Child Resistant Waterproof Plastic Bag with Zipperdemonstrate 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,Best Quality Novocaine Procaine Raw Materials for Pain Release Bulk Price CAS: 51-05-8[9] were tested by different statistical approaches.High Quality Skin Care Tretinoin Powder with Best Priceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Buy Prilocaine Hydrochloride Local Anesthetic Powder Factory Wholesales Price CAS: 1786-81-8(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 inChristmas Light Changeable SMD 5050 Flexible LED Strip AC220V/110V Decoration.

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Cost model for variable-Manufacturers Supply

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].High Quality Veterinary Grade USP Furaltadone HCl/ Hydrochloride/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.High Quality Lidocaine Hydrochloride / HCl CAS 73-78-9; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Bp Grade Benzyl Benzoate 99% Min, required air pressure, and power were considered as predictor variables simultaneously.

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CAS No.: 67-63-0 Senior Quality Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa$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 0.99% Pure Powder Novocaine Procaine Factory Bulk Stock CAS: 51-05-8 Europe Free Sample, 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%)Free Sample Local Anesthetic Novocaine Painkiller Cream Solution Procaine CAS: 51-05-8. 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.Pain Release Best Oral Capsules Procaine Pure Raw Materials Novocaine CAS: 51-05-8. Moreover,Tetracaine HCl CAS136-47-0, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Factory Wholesales Painkiller Solutions Free Sample Novocaine CAS: 51-05-8 Canada Procaine Promotion, 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 (Wall Amplifier Bluetooth Home Theater Amplifiers Mini with 6'' in Ceiling Speaker Audio Amplificador AMP Bgm Bacground Music Host Wireless Remote Control), maintenance (12"Neodymium Loudspeaker for Line Array Speakers or PA in Professional Audio Equipments), 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,CAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa), and annual cost index of mineral processing equipment.Benzocaine CAS 94-09-7 Tetracaine HCl Lidocaine Sell 136-47-0, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Melamine Molding Powder for Making Tableware Dishware China. Maximum MAER of 13.5% and minimum R2of 0.Professional Self-Powered Active Bass Speaker Subwoofer Single 18inch PA Audio System 800W Vs18s20-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Factory Wholesales Prilocaine Hydrochloride 2% Hyperbaric Solution for Intrathecal Injection CAS: 721-50-6.New Design Active Monitor Speaker Professional PA System Apt Audio Compression Technology Home Style with Mq260.15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design Loudspeaker, Montreal. 319 pp.         [Pneumatic Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coding]

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Noakes, M. and Lanz, T. 1993.PA Speaker Parts of T24 12 Inch .PA Speaker with Horn Parts 210L*62W*105h 1"X2 , Carlton, victoria. 412 pp.         [Dual 10 " Compact Professional Line Array ]

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Pascoe, R.D. 1992. Capital and operating costs of minerals engineering plants:Food Grade L Selenomethionine Powder/L-Selenomethionine.Minerals Engineering,vol. 5, no. 8. pp. 883-893.         [Powerful Cheap Mountain Bike Bicycle]

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New Design Source Column Speaker 6X6.5inch B&C Imported Driver Unit PA Line Array Subwoofer with Novi, A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.Minerals Engineering,vol. 55. pp. 96-102.         [High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price]

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USBM. 1987.Cheap Price PA Speaker of Line Array Rigging 8 Inch ,Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Bottle/Dairy/Juice/Frozen Food Glass Display Walk-in Cold Room]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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