slide1 l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Valorization of solid waste rich in nickel and vanadium produced by the combustion of fuel oil PowerPoint Presentation
Download Presentation
Valorization of solid waste rich in nickel and vanadium produced by the combustion of fuel oil

Loading in 2 Seconds...

play fullscreen
1 / 20

Valorization of solid waste rich in nickel and vanadium produced by the combustion of fuel oil - PowerPoint PPT Presentation


  • 141 Views
  • Uploaded on

National Polytechnic School Extractive Metallurgy Department Quito - Ecuador. Valorization of solid waste rich in nickel and vanadium produced by the combustion of fuel oil. Ibujés Paulina, De la Torre Ernesto and Guevara Alicia. The combustion of fuel oil in boilers. Fuel oil.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Valorization of solid waste rich in nickel and vanadium produced by the combustion of fuel oil' - orpah


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

National Polytechnic School

Extractive Metallurgy Department

Quito - Ecuador

Valorization of solid waste

rich in nickel and vanadium

produced by the combustion of fuel oil

Ibujés Paulina, De la Torre Ernesto and Guevara Alicia

slide2

The combustion of fuel oil in boilers

Fuel oil

Slag incrustation

Fly ash acumulation

slide3

The problem

60 ton/year

Fly ash

V

Cd

Fe

Ni

Slag

slide4

Fly ash methodology

Acid leaching

HNO3, HCl, H2SO4

Crystallization

25°C 24h 20 – 40 g/L

75 °C

solution

Acid leaching

H2SO4

Roasting

250 – 950 °C

0.5 – 2.0 h

25°C 24h 20 – 200 g/L

cake

Characterization

Stabilization

Atomic Absorption Spectrophotometer

A X-ray diffraction (XRD) in a D8 advance equipment

Cake 33-60 %

Cement 33-40 %

Lime 10-33 %

slide6

Mineralogical content by X-ray diffraction (XRD) equipment

fly ash roasted at 550 - 950°C

slide7

Vanadium, nickel and iron recovery

from stirred leaching (750rpm) with H2SO4 200 g/L and 25% solids on the fly ash burned at 350°C for 1.5 hours.

slide8

Crystallization of the strong solution

The strong solution produced

from stirred leaching (750rpm) with H2SO4 200 g/L and 25% solids on the fly ash burned at 350°C for 1.5 hours.

slide9

Stabilization of cake

The cake produced

from stirred leaching (750rpm) with H2SO4 200 g/L and 25% solids

on the fly ash burned at 350°C for 1.5 hours

  • The standard of public sewer system discharge (Ecuador)
  • U.S. EPA 40 CFR 261.24 standards, EPA 2003

38%

Cake

31%

Cement

31%

Lime

slide10

Slag

Leaching

HNO3, HCl, H2SO4, HNO3+HCl, NH3, NaOH, NaCl, NH4Cl, Na2CO3

LeachingH2SO4 + Br / H2O2

20-300 g/L 25-80°C

Roasting

Leaching H2SO4

20-100 g/L

2 h 450-550°C

Roasting

NaCl, Na2CO3

Characterization

Leaching H2O

Atomic Absorption Spectrophotometer

A scanning electron microscope (MEB-EDX)

A X-ray diffraction (XRD) in a D8 advance equipment

2 h 450-550°C 18-22% NaCl/Na2CO3

Crystallization

120-200 g/L

0.5-2.5 M

Leaching H2SO4

Leaching Na2CO3

Stabilization

components distribution of the slag section by scanning electron microscope meb edx
Components distribution of the slag sectionby scanning electron microscope (MEB-EDX)

Increase 200x

Increase 1500x

V

Ni

Si

Fe

O

mineralogical content of the slag by x ray diffraction xrd in a d8 advance equipment
Mineralogical content of the slagby X-ray diffraction (XRD) in a D8 advance equipment

Slag roasted at 550 and 650 °C

slide15

Vanadium, nickel and iron recovery in solution

by agitated leaching (750 rpm) with H2SO4 200 g/L, 25% solids at 70°C.

slide16

Vanadium, nickel and iron recovery in solution

from agitated leaching (750 rpm) of the solid residue (from H2SO4 leaching)

with Na2CO3 2 M at 75°C.

slide18

Stabilization of slag cake

The cake produced from leaching sequence with H2SO4 and Na2CO3was constituted by

  • The standard of public sewer system discharge (Ecuador)
  • U.S. EPA 40 CFR 261.24 standards, EPA 2003

50%

Cake

40%

Cement

10%

Lime

slide19

ConclusionsFly ash

The fly ashhas 5.42wt-% iron, 5.31wt-% vanadium and 1.61wt-% nickel, and amorphous material. (NaV6O15, NiV2O6, Na0.33V2O5, NiV2O6,Ca0,17V2O5, NaV6O15)

Fly ash was roasted at 350°C for 1.5 hours and agitated leaching with H2SO4 200 g/L at 25°C, 25wt-% solids for 8 hours at 750 rpm

in order to recover 91wt-% vanadium, 73wt-% nickel and 70wt-% iron in solution

slide20

ConclusionsSlag

The slag has 28.72wt-% vanadium, 8.16wt-% nickel, 1.62wt-% iron. (Ca0,17V2O5, Na0,33V2O5, Na0,76V6O15, NaV6O15, NiV2O6, SiO2)

Slagwas leached with H2SO4 200 g/L at 70°C, 25wt-% solids for 4 hours stirring (750 rpm) followed by another leaching with Na2CO3 2 M, 75°C, 25wt-% solids and 8 hours

in order to recover 75wt-% vanadium, 21wt-% nickel and 34wt-% iron

The fly ash and slag processing is costly and complex. Their valorization for vanadium and nickel recovery is possible, but must be evaluated with large scale essays