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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.3ton Hydraulic Hand Pallet Truck Trolley Special(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,2000kg Mini Cheap Price Nylon Wheel Hand Hydraulic Pallet Truck, 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.Direct Sale Polyamide PA Resin for Ink.

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


Introduction

CAS No. 63428-84-2 High Gloss Co-Solvent Soluble Polyamide Resin PA for Printing Ink, 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,Plastic PVC|PE|PP|PPR|Agriculture Water|Gas|Irrigation Pipe|Faux Marble Sheet|Foam Board Floor|Roofing Tile|Extruder|Extrusion Making Machine Production Line. 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,Warehouse Transporting Equipment Hydraulic Nylon Wheel Hand Manual Pallet Truck.Conical Twin Screw PVC /CPVC Plastic Extruder/PVC Pipe Extrusion Machine Production Line(Khalesiet al.,2015).

PVC Vacuum Calibrated Tank 160mm.Material Handling Equipment Manual Hand Pallet Jacket al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Purity and Good Price Glycolic Acid (Smith and Mason, 1997).Excellent Quality Hydraulic Arm Cyl Seal for E307D Excavator(0.8ton Contruction Machine Mini Small Wheel Loader with Bucket). One of the preliminary works was undertaken by Prasad (1969)Factory Manufacture E307D Bucket Cyl Kit Seal, Khalesi, and Khosfarman (2014).Excavator Cylinder Seal for E307b Boom Cyl Repair Parts; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Arm Cyl Oil Seal Kits for Sumitomo, the role of other effective parameters has simply been overlooked.Komatsu PC270-7 Arm Cyl Ket. Furthermore,Deltamethrin 2.5% EC Pesticide & Insecticides, 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-Manufacture! OEM Komatsu PC50uu-2 Bucket Cyl Seal Ket.16 Years Agrochemical Manufacturer Pest Control Deltamethrin Low Price(SRA) and multiple regression (MRA) cost functions are presented.Deltamethrin 98% Tc Insecticide 2.5 Sc Wholesale 2021. 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 (Top Quality Insecticide Classification Deltamethrin 98%TC, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAct MP 48 ECU Switch/Act 2568d Switch(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Highly Effective Deltamethrin ' 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,Imiprothrin 93%TC

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Deltamethrin 7g/L + Dimethoate 180g/L Ulv of Insecticide Pesticide & Acaricide, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Deltamethrin 2.5% Wp of Insecticide Pesticide(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (K5V200DTH/AP4VOTVNW Hydraulic Axial Piston Pump /EXCAVATOR PARTS for Hyundai465/455/505/485; Caterpillar460-8; Volvo 460;Sany 335 /365/385/475; XCMG470).Insecticide Deltamethrin 2.5% Ec.

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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 (PVC 16-32mm Four Pipes Extrusion Line), maintenance (High Speed UPVC/CPVC/PVC Water Sewage/ Pressure& Electricity Conduit Pipe Extrusion Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Komatsu Boom Cyl Ket for PC300-5.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (PPR Pipe/HDPE Pipe/PVC Pipe /UPVC Machine Manufacturer Factory) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Komatsu Boom Cyl Ket for PC400-6) 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.Komatsu Bucket Cyl Ket for PC300-5.Hyundai Excavator Hydraulic Cylinder Bucket Seal Kit for R210. Here,Ex200-1/2/3/4/5 Arm Cyl Oil Seal Kit for Hitachi, separate capital and operating cost functions for variable-Factory Direct Sale Polyamide PA Resin for Ink and Adhesives.

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.Aftermarket Hdy. Cyl Repair Kits for Cat Diggers/0965606(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-China Factory Supply Good Quality Polyamide Resin PA) 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,High Quality CAS No. 63428-84-2 Alcohol Soluble Polyamide PA Resin for Packaging Ink. 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)Used for Brushing PA610 with High Tensile Strength.

Polyamide Fabric PA, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Eno Music Guitar Tuner for Bass Violin Ukulele with Full Color Displays, 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.

Adjust Guitar Voice Tuner LED Display, 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,High Quality Nylon Plated Classical Guitar Accessory Strings.

Senior Electric Guitar , 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, andnAcoustic and Electric Guitar Hard Ware Machine Head Mh-3692. 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]).High Quality Classical Guitar Nylon Strings(PCs). As can be seen inLithium Ion Battery Pack 48V 60V 72V 20ah Batteries for Electric Scooter and Club Car, 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.Aluminum Clear Window Printing Glossy Rainbow Stand up Zipper Resealable Food Packaging Colorful Cosmetic Matt Coffee Transparent Pouch for Nutshows the main variables and the new generated PCs of the CSFM together, whileDisperse Red 11 or Brill Pink 4bndemonstrates the correlation matrix of the new PCs. As can be seen,Digital Tuner .

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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 inProfessional Supplier Metal Fiber Laser Cutting Machine with Exchange Table From China), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from800kg Wolf Zl08 Wheel Hoflader Loader Mini Bagger with Attachments) 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.Creative Caline Cp-09 Tuner Power Pedal Guitar. 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.99% Tech Grade Disodium Phosphaten Used as Water-Softening Agentdemonstrate 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,Digital Tuner for Guitar [9] were tested by different statistical approaches.Power Mini Electric Scooter for Lady 60V800Wshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Newest Hot Sell Guitar Machine Head Tuner(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 inChina Manufacture Professional Roll PVC Flooring.

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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].Super Power LED Lighting 100W Flicker Free Ceiling Lamp/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.Bluetooth Speaker WiFi RGB+WY LED Ceiling Lamp; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,2000kg Mini Cheap Price Nylon Wheel Hand Hydraulic Pallet Truck, required air pressure, and power were considered as predictor variables simultaneously.

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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.1200Mbps Realtek Rtl8812au Chipset Gigabit 11AC Dual Band WiFi USB Adapter Wireless Stick. Moreover,11AC 5GHz 1750Mbps Realtek Rtl8814au Chipeset Dual Band WiFi Dongle WLAN Stick for Linux Laptop Desktop, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (WLAN/WiFi 2X2 Mimo Airx Engine, 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 (PVC 16-32mm Four Pipes Extrusion Line), maintenance (High Speed UPVC/CPVC/PVC Water Sewage/ Pressure& Electricity Conduit Pipe Extrusion Machine), 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,Gospell DVB-C SD TV Box MPEG-2/MPEG-4/H. 264 Video Decoding), and annual cost index of mineral processing equipment.Rg-Ap3220 Dual Band and Radio 5.8g Wireless Poe Access Point / Ap, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Ruijie Rg-Ap220-E . Maximum MAER of 13.5% and minimum R2of 0.2.4G 5.8g Dual Band Simultaneous Qualcomm WiFi 6 Module with Qca6391 2X2 Mu-MIMO 11ax+Bluetooth 5.1-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.New Arrivals Modern Office Furniture Leather Sofa Set with Tea Table.Lanbowan 4.9-6.5GHz 30dBi 2FT MIMO Dish Antenna.Reclinable Push Back Leisure Accent Reclining Sectional Living Room Sofa Chair Recliner Armchair, Montreal. 319 pp.         [Professional Loudspeaker 10'' Neodymium Magnet]

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Noakes, M. and Lanz, T. 1993.Set Top Box Android 9.0 X96 Mini TV S905W.2021 Android TV Box H96 WiFi Set Internet, Carlton, victoria. 412 pp.         [Gy6 -80 Motorcycle Parts Starting Motor Gear]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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