1. Waste Mining
Ken Perrott

2. Oil Metals Non-metals
Non-renewable
resources
Land for land-fill

3. Carbon, P, N, Zn, Cu,
heavy metals +
Biosolids -
Land-fill disposal

4. Waste mining In a world of dwindling non-renewable resources
Let’s treat waste as a
resource

5. + - Economics High value product Waste Low value product Biosolids
Fly ash
Low value product -

6. Waste mining
Let’s produce high value
products from waste

7. Current project Local wastes Several wastes Proof of concept
Complimentary materials

8. Current project Biosolids Coal burning power stations Fly ash
Fertiliser
manufacture
Hydrofluoric
acid

9. Hydrofluoric acid Reagent Acid leaching HF + H2SiF6
H2SiF6 complements HF

10. Products from biosolids
Charcoal
Gases – CH4,
CO, H2
Pyrolysis
Oils

11. Products from biosolids
CH4, CO,
H2, Oils
Chemical
precursors
Fuel for
pyrolysis

12. Fluorocarbons
+HF
Charcoal
Industrial
uses
Methanol
Water
treatment

13. Products from biosolids
Activated carbon
for
water treatment
Pyrolysis
HF/H2SiF6
leaching
CuF2, ZnF2
PO4, SO4, NH3
Biosolids

14. Oxidative pyrolysis CO, CO2, H2, etc Methanol, Carboxylic acids, etc.
Ash
HF/H2SiF6
leaching
Biosolids

15. Products from fly ash SiF4, BF3, PF5, SF6 TiF4, WF6, ZrF4 Fly ash +
HF/H2SiF6
CuF2, ZnF2 etc
AlF3, CaF2, MgF2

16. Recycling HF/H2SiF6 SiF4, TiF4, CaF2, MgF2, CuF2, AlF3, etc HF, F2
Reaction or hydrolysis
Elemental Si
SiO2, CaO, MgO,
TiO2, CuO, Al2O3
Molecular sieves

17. Current project
Activated C
SiO2
TiO2
Molecular sieves
CaF2
AlF3

18. Future products? Elemental Si Fly ash Catalysts Fluorocarbons
Biosolids
Methanol
Other organic
chemicals

19. Concluding comments Waste utilisation – pressing issue
Waste has a bad name
Treat waste as a resource
Very limited NZ research