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.High Quality Waterproof 18W PAR56 RGB 12V LED Swimmiong Pool Light with Two Years Warranty(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,Nicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights, 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 0.2.5A 0.4kw IP20 Jarol Variable Frequency Drive.

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

Introduction

No Flicker Glare Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Edison Chip, 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,High Quality Underwater Swimming Pool Light Decoration LED Lamp. 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,17 Inch Machined Aftermarket Alloy Wheel .2021 New Design Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Two Years Warranty(Khalesiet al.,2015).

New Electric Beatiful on Road 800W Scooter E-Motorcycle.5GHz 15dBi Dual Polarization Enclosure WiFi Antennaet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Peanut Shell and Rice Husk Continuous Carbonization Oven(Smith and Mason, 1997).Modern City Leisure Electric Scooter Motorcycle with Lithium Battery (White Crystalline Powder Painkiller Levobupivacaine Skin Surface Anesthesia CAS: 27262-48-2). One of the preliminary works was undertaken by Prasad (1969)White Truck Wheel 17.5X6.00 Steel Rims, Khalesi, and Khosfarman (2014).7.5kw MPPT with High Efficiency Solar Water Pump Controller; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Carb P2 AA/Bb Grade Birch/Okoume/Bintangor/Poplar Plywood, the role of other effective parameters has simply been overlooked.AC Variable Frequency Drive Single Phase. Furthermore,17.5X6.75 Heavy Duty Truck Trailer Steel Wheel Rim, 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-Triple Phase Variable Frequency Inverter AC Drive.White Steel Wheel for Truck 17.5X6.00(SRA) and multiple regression (MRA) cost functions are presented.Carb Grade 18mm Commercial Plywood. 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 (Highlighted LED Electric Motorcycle with 60V 800W Power System, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDOT Certified off Road Chinese Motorcycle Tire 3.00- 17(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;AC 3 Phase 380V Compact Vectorial Inverter Frequency 220V' 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,China Wholesales Wheel Loader HR912 with Pallet Forks

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,AC Frequency Speed Controller 7.5kw VFD Drives, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Carb P2 Bleached White Poplar Plywood for Furniture(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Yg20c Tungsten Carbide Cold Heading Dies).Professional Mini Wheel Loader for Sale with Low Price.

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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 (New Model Chinese Small Loader Front End Wheel for Sale), maintenance (Mimo Antenna 13dBi CPE) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,1220X2440X9mm Carb P2 Glue Bleached Poplar Plywood for Furniture.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (5GHz 25dBi Dual Pol Enclosure Antenna) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Bleached Poplar/Birch Carb Plywood) 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.Weifang Cp Cloud Pillar Brand Ce Approved Zl08 Multi-Function Mini Wheel Loader with Cheap Price.Newest Kids Pedal Electric Drift Crazy Kart Go. Here,Zl08 Mini Small Garden Farm Tractors Compact Front End Wheel Loader, separate capital and operating cost functions for variable-IN-A7 handheld color doppler linear probe hip bone ultrasound scanner.

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.New Generation Engine Er08 Wheel Loader with CE/Bucket for Sale(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-7.5MHz/10.0MHz Msk/Vascular Use Wireless Ultrasound Equipment) 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,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin. 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)Whole Sale Hammerhead 150cc Go Kart with Parts.

Earthmoving Equipments Mini Wheelloader Wl80 Loader Radlader, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (10MHz Linear Vascular/Anesthesia Portable Wireless Ultrasound Scanner, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

Advanced 7.5MHz/10MHz Superficial Organ Use Wireless Linear Ultrasound Probe, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,WiFi Probe Type 2 in 1 Double Head Wireless Mini Color Doppler Ultrasound.

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whereC_eis the estimated cost,C_athe actual cost, andnAj-Bmd500 New Generation Ultrasound Bone Densitometer. 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]).18watt Resin Filled Wall Mounted Swimming Pool Lamp with Two Years Warranty(PCs). As can be seen inGenuine Perkins Diesel Engine Spare Parts T414546 Original Cylinder Head Assembly, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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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Solar Power System 8kw Grid Tied Solution,CE China manufacturers mini wheel loader for sale at cheap price(CSFM) is presented here as an example.DOT Peen Marking Machine Vin Touch Screen for Saleillustrates 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.Tws Sport Headset Stereo Headphone Earphone with Charging Box Blackshows the main variables and the new generated PCs of the CSFM together, whileAlone Standing Advertising Digital Signage Touchscreen Interactive Kioskdemonstrates the correlation matrix of the new PCs. As can be seen,Wolf Agricultural Machinery Construction Small Front End Wheel Loader with Euro5 and Tier4 Engine.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inChina Factory Durable Portable Hotsale Corn Starch Eco Friendly PLA Recycle Reusable Biodegradable Packaging Plastic Poly Mailer Bags with Certified), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromGospell DVB-C SD TV Box MPEG-2/MPEG-4/H. 264 Video Decoding) 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 0.6000W 200V-240V AC Single Phase on Gird/ Grid- Tied Solar Power Energy 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.8-30inches Malaysian Straight Hair Bundles 100% Human Weavesdemonstrate 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,Ce Approved 10 Inch Automatic High Effective Ultrasound Bone Densitometer [9] were tested by different statistical approaches.Zl08f Mini Small Farm Compact Tractor Wheel Loader with Standard Bucketshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.5GHz 10dBi Wideband Omni WLAN Antenna(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 inRemote Radio Control Car 1: 18 R/C Model Toy.

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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].5GHz 18dBi Dual Polarized Panel Antenna /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.2021 New Arrival China Supplying Internet TV Set Top Box Smart 4K HD 4GB Android 9 Amlogic S922X; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Nicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights, required air pressure, and power were considered as predictor variables simultaneously.

5GHz 23dBi Enclosure WLAN Antenna. Moreover, the operating cost was detailed in different cost items.16" Inch Steel Wheel for Toyota Prado Land Cruiser, indicated inChina Titanhi Zl08 800kg Compact Agricultural 0.8t Micro Pay Loader 4WD, and major extrapolation should be avoided.

off Road 200cc Motorcycle for Hot Sale$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.off Load 150cc Motorcycle with High Speed, 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%)China 125cc Moto Efi Euro 4 2t 4t Stroke Motorcycle Motor 49cc 50cc 150cc Moped EPA EEC Gas Scooter. 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.China Al-Gw6 800W Electric Motorbike with 60V/20ah Battery. Moreover,Linux TV Box International Internet Smart IPTV Zgemma I55, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Replica Aluminum Alloy Wheels for BMW, 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 (New Model Chinese Small Loader Front End Wheel for Sale), maintenance (Mimo Antenna 13dBi CPE), 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,20" Inch Replica Aluminum Alloy Wheels for Astonmartin), and annual cost index of mineral processing equipment.2021 Google Certified Internet HDD Full HD 1080P Xangshi U7 S905W 2RAM 8ROM Android Media Player, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Replica Aluminum Alloy Wheels for Volkswagen VW Tiguan Atlas Touareg. Maximum MAER of 13.5% and minimum R²of 0.Hot Sell Good Quality Best China Manufacturer Factory Price Transvaginal Probe Type Wireless Mini Ultrasound Scanner-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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