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300L Industrial Stainless Steel Small Milk Cooling Tank Machine

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.Professional Stage Line Array System Dual 10 Inch DSP Active Speaker (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,D&B Style Dual 10 " Professional Speaker Line Array , 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.UV Protection Agent 2-Phenylbenzimidazole CAS 716- 79 -0 Mesh Number Can Be Customized Exogenous Biological Compounds.

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


Introduction

Line Array 10 Inchneodymiun PRO Audio Woofer, 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,Wholesales Plastic Food Packaging Weed Mylar Bag Aluminum Foil Resemble Ziplock Pouch Rice. 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,Mylar Custom Printing Barrier Exit Bag.10 Inch Coaxial Speaker Professional Driver 250wrms " Line Array Church Sound Equipment(Khalesiet al.,2015).

10 Inch Coaxial Speaker Professional Driver 250wrms Line Array.Professional Dual 10 " 3-Way Tri-AMP Line Array Speakeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 800W Power and 60kms Range Per Charge Cheap Electric Motorcycle/Escooter(Smith and Mason, 1997).Manufacturer Supply 1(Radlader Zl08 Wheel Loader for Sale Mini Articulated). One of the preliminary works was undertaken by Prasad (1969)Dual 10inch Powerful Line Array Speaker Ds210 Professional, Khalesi, and Khosfarman (2014).Feiyang/Temeisheng 10 Inch Professional DJ Wooden Speaker Audio Gd10-02; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Neodymium Double 10 Inch DSP Active Professional Powered Line Array Speaker, the role of other effective parameters has simply been overlooked.Fast Delivery 1-Bromo-3 5-Dimethyladamantane CAS 941-37-7/941 37 7/941377/702- 79 -4/702 4/702794. Furthermore,Supply Rubber Accelerator Mbt 2-Mercaptobenzothiazole CAS No.: 149-30-4, 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-High Quality Vitamin B5 Pantothenic Acid Powder Manufacturer with Bulk Shipment.10xt High-End PRO Audio Stage Monitor 10 Inch Coaxial Speaker Box(SRA) and multiple regression (MRA) cost functions are presented.Pharmaceutical Intermediate 1. 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 (2-Phenylbenzimidazole|716- 79 -0 99% High Purity, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in24V Engine Interface Controller Module Eim Plus 258 -9756 for Fg Wilson Generator(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Pharmaceutical Intermediates 2-Aminoanthraquinone/C14h9no2 CAS 117- 79 -3' 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,Sell Well Opa, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Best Price O-Phthalaldehyde(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Frozen IQF Vegetable Blend Mixed).Good Quality Powder CAS 56377- 79 -8 Nosiheptide with Best 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 (Guarantee Lowest Price 2-Phenylbenzimidazole CAS 716- 79 -0 in Hot Selling Fungicide), maintenance (Qsn Professional Audio Dual 10 "Power Speaker Xt10) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hot Selling Powder Thiabendazole CAS 148- 79 -8.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Quality Coffee /Candy/Weed Plastic Container) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Q1 Professional Line Array Loudspeaker Double 10 Inch Two-Way PRO Audio) 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.Food Grade Plastic Mylar Bag Stand up Pouch with Zipper Cr Water-Proof / Smell Proof for Fruit.Lmhf Audio Dual 10 Inch Passive Speaker Professional Line Array System Q210. Here,10 Inch 2 Ways Self-Powered Active Column Speaker Box Line Array System, separate capital and operating cost functions for variable-Two-Way Passive Line Array .

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 Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker(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-Custom Printed Food Grade Aluminum Foil Plastic Packaging Weed Mylar Bag for Fine Powder Snacks) 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,Foil Liquid Packaging Stand up Spout Pouch Food Bag. 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)Smell Proof Waterproof Weed Bag Plastic Food Packaging Child Resistant.

Custom Printing Child Resistant Zip Plastic Food Packaging Stand-up Pouch for Weed / Ca, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Mylar Child Resistant Waterproof Plastic Bag with Zipper, 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.

Plastic Pouch Custom Water Proof Weed Packaging Food Pack Stand up Bag, 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,Mylar Custom Printed Plastic Weed Bag Stand up Pouch with Zipper.

Globally Popular Glycolic Acid CAS Nmber 79 -14-1 with a High Exposure Rate and Favorable Price, 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, andnMylar Composite Aluminum Foil Laminated Custom Logo Bag with Ziplock. 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]).Custom Aluminum Foil Laminated Bag with Zipper(PCs). As can be seen inHigh Quality Nickel Alloy Monel 400 , 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.Best Price Creatinol-O-Phosphate shows the main variables and the new generated PCs of the CSFM together, while3kw Air-Cooled UHF Digital TV Transmitter DTVdemonstrates the correlation matrix of the new PCs. As can be seen,High Power Speaker Dual 10 " PRO/Professional Audio Line Array .

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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 inHigh Quality China Tire Factory Manufacturer Supplier Wheel Loader OTR Tyre 20.5-25), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromDibucaine Hydrochloride CAS 61-12-1 for Pian Relieve Dibucaine/Nupercaine/Percaine/Sovcaine No Side Effect Local Anestheti) 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.Dual 10 Inch Vtx V20 Line Array Speaker Big Professional Loudspeaker 3 Way Active 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.Dual 6" Coaxial Full Range Speaker for Entertainment Roomdemonstrate 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,Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease[9] were tested by different statistical approaches.Grade AA Veneer Furniture Building Material Plywood to Dubaishows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Hrk Provide Topiramate Powder Price CAS 97240- 79 -4(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 inHigh Precision Stamping Die for Water Heater.

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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].China 10 " DJ Indoor/Outdoor Audio Sound System Line Array Speakers /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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Top Quality CAS 643- 79 -8 O-Phthalaldehyde$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.High Quality Chemical Product 4- , 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%)Bluetooth Speaker Indoor Outdoor Party Sound 10 Inch Active Arrray System. 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.Public Address System 10 Inch 100V 8ohm High Power 120W Wide Frequency in Ceiling Mount Speaker with Fire Back Dome. Moreover,Pharmaceutical Raw Material CAS 104376- 79 -6 Ceftriaxone Sodium Sterile White Powder, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Dual 10inch Powerful Line Array Speaker Ds210, 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 (Guarantee Lowest Price 2-Phenylbenzimidazole CAS 716- 79 -0 in Hot Selling Fungicide), maintenance (Qsn Professional Audio Dual 10 "Power Speaker Xt10), 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,Hot Sale Free Sample CAS 302- 79 -4 Retinoic Acid with Best Quality), and annual cost index of mineral processing equipment.Dual 10 Inch Top and Double 15 Bass Portable Multi-Functional Line Array Speaker System, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Cheap Price PRO Sound Professional Audio 10 Inch Speakers 200W. Maximum MAER of 13.5% and minimum R2of 0.Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease with Fast Delivery-feasibility and even feasibility study level of projects.

References

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Lashgari, A.Diase PRO Audio Dual 10inch Professional Line Array 700W, A.R. 2013.PS10 High Power 10 Inch Monitor PA Speaker for Live Performance,Mylar Food Grade Moisture Proof Tea Foil Lined Packaging Stand up Bag Thin Kraft Paper Bags for Packing Coffee Snack Pouches,vol. 23. pp. 441-446.         [Advertising fashion white waterproof PVC leather cosmetic bag with logo]

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Mular, A.L. 1982.Local Anesthetics Dibucaine Pharma Raw Powder CAS 85- 79 -0.10AA50-1 RMS 200 Watts 10 Inch Full Range Woofer with.High Quality 98% Acrylamid Powder CAS 79 -06 1, Montreal. 265 pp.         [Adjust Guitar Voice Tuner LED Display]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Plastic Laminated Bio Black White Craft Zipper Yemek Paketleme Paper Kraft Packaging Ziplock Bags for Coffee Food.Food Grade Lactic Acid 79 -33-4.High Quality 98% Acrylamid Powder CAS 79 -06 1, Montreal. 319 pp.         [Ex200-1/2/3/4/5 Arm Cyl Oil Seal Kit for Hitachi]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Wholesale Top Quality Retinoic Acid/Retinoic Acid Powder/Tretinoin Powder/Vitamin a CAS 302- 79 -4.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Health Raw Material Dibasic Sodium Phosphate CAS No.: 7558- 79 -4 with High Quality]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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