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*On-lineÂ version*Â ISSN2411-9717

*PrintÂ version*Â ISSN2225-6253

### J. S. Afr. Inst. Min. Metall.Â vol.117Â n.1Â JohannesburgÂ Jan.Â 2017

#### http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

**GENERAL PAPERS**

**TUV Ce Europe Popular 6000W Grid Tied Home Solar SystemCost modelling for flotation machines**

**S. Arfania; A.R.Polythene Plastic Sheet Making Machine****Tws True Wireless Headphone Earbud Bluetooth 5.0 New Design; M.R. Khalesi**

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.Jwell-Jwell-PVC Plastic Rigid Transparent Sheet Thickness 0.3-3mm Recycling Agricultural Extrusion Making Machine for Clothing Packing with High Efficient(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,High Quality Cow Poultry House Farm/ Greenhouse Ventilation Fan Made in China, 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 R^{2}, 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 R^{2}of 0.1HP/2HP/3HP/4HP/5HP Shrimp Pond Fish Farm Aerator Air Ring Blower.

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

**Introduction**

Diesel Engine Parts Fuel Injection Nozzle Dlla160p3125q, 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,Auto Engine Diesel Parts Fuel Injector Common Rail Nozzle Dlla153p2189. 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,Xft- 710 Axial Flow Fire Extinguisher Fan.Diesel Engine Parts Fuel Injection Nozzle Dlla155p274(Khalesi*et al.,*2015).

Diesel Engine Parts Fuel Injection Nozzle Dlla153p049.Diesel Engine Parts Fuel Injection Nozzle Dlla155p273*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Kas Professional Dual 15 Inch Subwoofer 10 Line Array Speaker(Smith and Mason, 1997).Diesel Engine Parts Fuel Injection Nozzle Dlla154p332(China Good Quality 2.75- 17 Tubeless Motorcycle Tire/Tyre). One of the preliminary works was undertaken by Prasad (1969)Diesel Engine Parts Fuel Injection Nozzle Dlla154pn006, Khalesi, and Khosfarman (2014).High Quality Nickel Alloy Monel 400 ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Tsp Trisodium Phosphate/ CAS No.: 7758- 79 -4/Anhydrous/Na3po4, the role of other effective parameters has simply been overlooked.Disperse Violet 63. Furthermore,Skycron® Disperse Violet 1/2R 100% Fabric Dye for Polyester, 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-Disperse Red 11 or Brill Pink 4bn.94% Sodium Tripolyphosphate STPP CAS No: 7758- 79 -4(SRA) and multiple regression (MRA) cost functions are presented.Skycron® Disperse Violet 63/RL 200% Color Dye For Clothes. 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 (Flame Retardant Ammonium Polyphosphate , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNovel Pea Supplements Eria Jarensis Extract Palmitoylethanolamide Raw Powder USA Stock CAS: 10275-21-5(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Pigment Violet 23 Liquid' names:

►Asapp-II Ammonium Polyphosphate for Intumescent Paints : based on 36-foot,Water Treatment Softener Dibasic Sodium Phosphate 97% Powder CAS No.: 7558- 79 -4,Indissolvable Ammonium Polyphosphate CAS No. 68333- 79 -9,Sodium Phosphate Dibasic CAS No 7558- 79 -4, and level control

►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,Detergent Grade Sodium Tripolyphosphate 94% CAS No: 7758- 79 -4

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Boring Machine Tools Micro Head F1type CNC Heads Set, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),Straight Shank Collets C16 C20 C25 C32 Collet Chuck for Power Milling(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Glass Trophy Awards).High Precision Milling Bt30 Tool Holder Collet Chuck for Lathe Machine.

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 (94% Sodium Tripolyphosphate STPP CAS No: 7758- 79 -4), maintenance (Supply Ammonium Polyphosphate APP ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Sdc Shrink Collet Chuck Toolholders for CNC Machine Part.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Nickel Based Alloy W. Nr 2.4819 Hastelloy C276 Uns N10276 High Temperature Steel Round Flat Bar) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (UNS NO2200 Nickel Plate) 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.Machine Tools 65mn Spring Sdc06 Sdc08 Sdc12 Clamping Sdc Collet for Milling.Diesel Engine Parts Fuel Injection Nozzle Dlla148p591. Here,Machine Tools High Precision 65mn Spring Sdc06 Sdc08 Sdc12 Clamping Sdc Collet for Milling, separate capital and operating cost functions for variable-Diesel Fuel Injection Nozzle Dlla160pn141.

*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.Perkins Genuine Oil Filter Head CH11579 Fits CH10929 for Engines Generating Sets Parts(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-Diesel Engine Parts Fuel System SD265 Nozzle) 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,Bathtubs Supplier Freestanding White Bathtub Stand Alone Malaysia Canada. 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:

where*Y*refers to capital or operating costs,*X*defines an independent variable (one of the machine predictor variables), and*a*and*b*are constant values (parameters)Vat Violet 13.

Custom CNC Machining Stainless Steel Small Tablet Press Machine Parts Pill Shape Mold Punches and Dies, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Solvent Violet 9 , Khalesi, and Khosfarman, 2014).

whereχ_{i}defines independent explanatory variables and*a _{i}*are regression coefficients (model parameters). As was mentioned, independency of

*x*variables 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.

_{i}CAS 81-48-1 Solvent Violet 13 for Dyestuff Powder, R^{2}, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R^{2}is 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]:

where*X _{obs}*is the observed value,

*x*the estimated value at time/place

_{e}*I,*and n,Inconel X-750 Forged/Forging Round Bars .

Factory Price Hot Selling Massage Swimming Pool SPA, analysis of residuals, tests of MAER values and evaluation of R^{2}were 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).

where*C _{e}*is the estimated cost,

*C*the actual cost, and

_{a}*n*Laswim Swim SPA Endless Swimming Pool Whirlpool Bathtub. 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]).Jwell- PVC|PP|PE|PC|ABS Small Profile Recycling Agricultural Extrusion Machine for Building Industry Home and Office Decoration(PCs). As can be seen in60W 16Ω Professional Coaxial in Ceiling Business Speaker Sound Audio System with Mq-6c190826, neither*X _{1}*nor

*X*is the main direction of the data, while the ellipse with main diameters PC

_{2}_{1}and PC

_{2}matches 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 and

*X*as Equations [5] and [6]:

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In this research, main variables of*X _{1}, X_{2}*.

*.. X*were 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.

_{n}*HDPE Plastic Geomembrane Sheet Making Extrusion Machine*

Jwell- PP PS Plastic Environmental Protection Sheet Recycling Making Extrusion Cup Machine Production for Green Food Container and Packaging Good Price,Uns No6600 Inconel600 Steel Plate(CSFM) is presented here as an example.17 Inch Machined Aftermarket Alloy Wheel 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.Alcohol/ Refrigerating Fulid Screw Top Can with Brush Wholesaleshows the main variables and the new generated PCs of the CSFM together, whileSpeaker Wall Mount Bracket for PRO Audio Steel 134.8L*90W*160h demonstrates the correlation matrix of the new PCs. As can be seen,Alloy C276 Hastelloy Nickel Pipe ASTM B622 ASME Sb622 Uns N10276..

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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)

where*X _{i}*are main technical variables (like power or required air),

*a*are calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inANSI/BIFMA Standard Rectangular Office Meeting Conference Table), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromAC Fan Frequency Inverter VFD Vector Control 3pH 30kw) 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**

*Alloy Inconel 625 Nickel Strip *

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.Diesel Engine Parts Fuel Injection Nozzle 148pn306. The R^{2}is about 0.94 for both cases,*i.e.*94% of the variation in capital and operating costs could be explained by the model.Black Valve Universal Programmable OE Replacement TPMS Sensordemonstrate 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,Wholesale High Performance Cylindrical Roller Bearings Nu19/670 Nu19/ 710 N19/ Nup19/ Nu19/750 Nu19/1060 Nu19/1250 Nu19/1320[9] were tested by different statistical approaches.R-3-Amino-1-N-Boc-Piperidineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Original Hot Selling NTN Timken Koyo SKF Taper Roller Bearing 512/630m 512/630/So 5692/670 572/ 710 5692/800 5692/950 /Auto(a1, a_{2}, a_{3}) and new intercept (a_{0}) 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 inFood Grade Beef Skin Wholesale Edible Gelatin Powder 220 Bloom.

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*Cost model for variable-Perkins Engine Spare Parts Fan Belt Gasket - Cylinder Head Seal Cyl Cover 403D-11g 403A-11g1 403D-15g 403A-15g2 404D-22g 080109134 111147491 U11996410*

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].Zys Rolling Mill Bearing Four Row Taper Roller Bearings 3810/ 710/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.Virgin PA12 Resin GF20 GF30 Pellets; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality Cow Poultry House Farm/ Greenhouse Ventilation Fan Made in China, required air pressure, and power were considered as predictor variables simultaneously.

PA410 Resin Q-Hgm24 10 -20% Glass Mineral Filled Heat Stabilized. Moreover, the operating cost was detailed in different cost items.Pharmaceutical Raw Materials 1 2-Dimethyl-5-Nitroimidazole Dimetridazole CAS 551-92-8, indicated inPeq-18SD1 18'' Bass Reflex Active Powerful Subwoofer, and major extrapolation should be avoided.

Trimethyl Cis$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.Fast Delivery High Purity Benzaldehyde 100-52-7, 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 R^{2}values 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%)Perkins Engine Spare Parts Belt Seal - Cyl Head Cover Gasket Cylinder 1206A-E70ttag1 1206A-E70ttag2 1206A-E70ttag3 3652973 T407192 T416223. 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.Swimming SPA Pool Hot Tub Combo. Moreover,Zhejiang Province Acrylic Standing Alone Bathtubs, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Rofessional 21 Speed Mountain Bicycle 26 Inch New MTB, 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 (94% Sodium Tripolyphosphate STPP CAS No: 7758- 79 -4), maintenance (Supply Ammonium Polyphosphate APP ), 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,Perkins Genuine Cyl Head Assy ), and annual cost index of mineral processing equipment.Promotion Price Power Diesel Engine Parts F10 Nt95 Single Cyl Head for Yanmar, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Chinese Heavy Truck Diesel Engine Pump Cylinder 161500137712. Maximum MAER of 13.5% and minimum R^{2}of 0.Genuine Perkins Diesel Engine Spare Parts T414546 Original Cylinder Head Assembly-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015

Revised paper Received Jul. 2016

Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic GradeExclusive Model Electric Scooter 800W 1000W High Torque Matt BlackCorresponding author