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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

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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.Single 15 Inch High Quality Bass(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,Professional Audio Speaker Column Sound Equipment, 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.Professional Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820.

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


Introduction

Srx715 Sing 15" Professional Speaker, 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,Aclon DSP3500 Professional DJ Sound Speakers DSP Powered Line Array. 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,Small Column White Color Church Conference Room Speaker.Arc Shaped Column Speaker for Restaurant and Shopping Mall(Khalesiet al.,2015).

Peq-18SD1 18'' Bass Reflex Active Powerful Subwoofer.Professional DJ Line Array Sound Speakers DSP Powered Loudspeaker Amplifieret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Rotary Cut Bintagor Veneer for Panels and Furniture with Good Price(Smith and Mason, 1997).Theater Professional Line Array Speaker(100 PCS High Quality Resealable Hair Top Wig Clear Transparent Ziplock Bag Plastic Food Packaging for Oil). One of the preliminary works was undertaken by Prasad (1969)15' Water-Proof Installation Long-Throw Speaker with 100V Transformer, Khalesi, and Khosfarman (2014).Guangzhou Skytone Vera S18 18'' New Design Line Array Subwoofer; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Double 6inch Powered Line Array Speaker, the role of other effective parameters has simply been overlooked.Factory Export 99% Purity Chlorhexidine CAS55-56-1 with Lowest Price. Furthermore,Free Clearance Surface Anesthesia of Eyes, 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-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(SRA) and multiple regression (MRA) cost functions are presented.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. 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 (Vrx932 Horn Line Array Professional Manufacturer, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory Supply Dibenzylideneacetone CAS 35225- 79 -7 with Fast Delivery(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Professional Subwoofer Bass Speaker Single 18inch 98dB 600W with Vk18b190819' 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,Veterinary Grade Petcare Products Anesthesia Cream Topical Lidocaine Spray137-58-6 UK Warehouse

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Double 6" Professional Speaker Line Array, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),CAS No.: 67-63-0 Isopropyl Alcohol 99.9%/Ipa 99.9%/Isopropanol 99.9% Used as Pharmaceutical Intermediate(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Super Mini 3-Axis Vandalproof IR Dome Camera).Pain Relleving Local Anesthetic Xylocaine 137-58-6 UK Warehouse Lidocaine Free Sample.

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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 (Veterinary Grade Petcare Products Anesthesia Cream Topical Anesthetic Spray137-58-6 USA Warehouse Lidocaine), maintenance (Best Quality Valerophenone CAS 1009-14-9 Ukraine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Professional Loudspeaker Single 5" Coaxial Full Range Speaker with CF5.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Vrx932la Compact Line Array Speaker System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Vrx932la Dual Voice Coil Line Array Speaker Box) 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.Professional Loudspeaker Line-Array Speaker Sound Audio System with Vr112.Aluminum Speaker Box for 3" Column . Here,Portable Wireless Professional Rechargeable DJ Karaoke Sound Box Bluetooth PA Speaker with Wire Microphone 1PCS, separate capital and operating cost functions for variable-Single 12" Plastic Waterproof Speaker.

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.800W VERA 12 Line Array DJ Speaker Cabinet PRO Audio(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-Powered Concert Theater High Performance PA System Power Sub Bass) 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,2way Indoor Club Party Wedding Line Array 15inch Sound System. 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)12 Inch Audio Wireless Professional Portable Rechargeable DJ Bluetooth PA Trolley Speaker with LED Light ED-1201 Wire Microphone 1PCS.

Professional Active Powered Line Array Speaker Mini 5 Inch Audio, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Professional Dual 15" Multi-Purpose Speaker, 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.

Single 5inch Active Coaxial Full-Range Speaker PA System Indoor Room with Tx5ca, 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,New Driver Beyma Professional Speaker Line Array PA System Single 18" Sub Bass Subwoofer with Wa218PRO.

Srx725 Dual 15" PRO Audio Speaker Box, 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, andn3 in 6 out Digital Signal Processors Professional Audio System Line Array PA with Dp-36. 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 System Signal 15" Two-Way Full-Range Speakers PA with Tq15(PCs). As can be seen inPVC Pipe Making Machine Alibaba, 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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Professional Audio Signal 12" Two-Way Full-Range Speakers PA System with Tq12,DJ Stage PRO Audio Indoor Club 15" Line Array Loudspeaker(CSFM) is presented here as an example.Customized Rubber Spacer Black Silicone Bushingillustrates 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.High Bonding Polyamide Textile Fabric Hot Melt Adhesive Film Making/Extruding/Prodcution/Manufacturing Machine Lineshows the main variables and the new generated PCs of the CSFM together, whileFrench Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Candemonstrates the correlation matrix of the new PCs. As can be seen,15'' Waterproof Subwoofer with High Spl Use Indoor and Outdoor.

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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 in3D Illuminated Stainless Steel LED Front Light Channel Letter Sign), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromChinese Factory Special Cosmetic Raw Materials for Wrinkle Removal and Moisturizing High Purity Nano Liposomal Hydroxypropyl Tetrahydropyrantriol) 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.Stadium Banquet Hall Theater PRO Audio PA Speaker Line Array System. 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.498 Alicosolar Good Price 25kw on Grid Solar System 25000W Power Kit Mono Soalr Panel with CE/TUV/ISO for Home Usedemonstrate 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].Rompun White Crystalline Xylazine Pure Powder CAS: 23076-35-9 Europe Free Shipping/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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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.PA Speaker Accessories and Parts . Moreover,PA System with Rigging Shackle Hardware Parts M25 , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (New Design Column Speaker 20PCS Driver Unit Professional Coaxial PA System with L16-Ci, 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 (Veterinary Grade Petcare Products Anesthesia Cream Topical Anesthetic Spray137-58-6 USA Warehouse Lidocaine), maintenance (Best Quality Valerophenone CAS 1009-14-9 Ukraine), 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,Professional Self-Powered Subwoofer Indoor Outdoor PA Sstem DSP Bass Speaker Vk10SA), and annual cost index of mineral processing equipment.Power Column Speaker PA System, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Speaker Wall Mounting Bracket . Maximum MAER of 13.5% and minimum R2of 0.Single 18'' High Power Speaker Subwoofer-feasibility and even feasibility study level of projects.

References

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Kim, G.H., An, S.H., and Kang, K.I. 2004.Free Sample White Crystalline Powder Procaine South America Warehouse CAS: 51-05-8 Larocaine, neural networks, and case-based reasoning.Building and Environment,vol. 39, no. 10. pp. 1235-1242.         [UV Birch Plywood with Poplar Core Carb E0 Glue From Factory]

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Mular, A.L. 1982.Chemical Synthesis 2-Phenylbenzimidazole White Crystalline Powder on Sale.Active Compact Column PA Speaker Powered Loudspeaker Point Source.PA Speaker Sound System Dual 8'' Two-Way Line Array, Montreal. 265 pp.         [Bloom Tech Chemical Reagent ]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Wall Amplifier Bluetooth Home Theater Amplifiers Mini with 6'' in Ceiling Speaker Audio Amplificador AMP Bgm Bacground Music Host Wireless Remote Control.12"Neodymium Loudspeaker for Line Array Speakers or PA in Professional Audio Equipments.PA Speaker Sound System Dual 8'' Two-Way Line Array, Montreal. 319 pp.         [Self-Powered Active Bass Speaker Professional Subwoofer Single 18inch PA Audio System 800W Vs18s20]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.PRO Audio with Tweeter Horn for Line Array .Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Bike Hidden Folding Mountain Ebike Suspension Bicycle]

Noakes, M. and Lanz, T. 1993.Manufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5.Procaine Ester Anesthetic Skin Surface Anesthesia Top Quality HCl Powder, Carlton, victoria. 412 pp.         [T-Type Electric Beveling Machine ]

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Prasad, L. 1969.Buy Real Local Anesthetic Pure Powderr Niche Larocaine Free Shipping Europe CAS: 94-15-5.High Purity Local Anesthetic Larocaine Powder CAS: 94-15-5 UK Hot Sales, Metallurgy and Petroleum, Montreal. pp. 3-15.         [Motorcycle Parts Speed Cable for Gy6 -150]

Professional Dual 15" Multi-Purpose Speaker, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Safe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Go Kart ]

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USBM. 1987.Free Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5,Speaker Wall Mount Bracket for PRO Audio Steel 134.8L*90W*160h -metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [1156/1157 13SMD 5050chip Car LED Light]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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