Monday, 11 December 2017

To most of us the laymen, the chemical composition of each category of residues does not carry much significance in our understanding of how eco-toxic or otherwise they may be. We are more concerned on how the combination of WLP; NUF and FGD in the ratio 1:2:7 could enhance the efficacy of the Condisoil.

The combination ratio seems to demonstrate an agenda behind it i.e. to achieve an end result of radionuclide reading below 1 Bq/g so that it could be classified as non-radioactive and passed as a clean waste. This will remove WLP from the regulatory control of AELB and the final mixture will be placed under the purview of DOE.

It really does not matter if the 'Condisoil" is marketable. If it is not then it can be used in municipal landfills and there would not be a need to build a PDF for it!

Here are the Chemical compositions of each category of the residues :

Chemical Composition of the Residue Streams
Composition WLP......Weight %
FePO4.5H2O ------------ 54
Fe2O3 ----------------------- 5.5
Fe(OH)3--------------------- 4
Al2O3 -------------------------0.1
Al (OH)3 ----------------------3
Al2 (SO4)3.16H2O---------1.7
CaSO4. 2H2O---------------3.5
CaSO4 ------------------------0.9
Ca(OH)2 ----------------------0.1
CaCO3 ------------------------Nil
CaCO3.2H2O----------------0.1
CaC2O4 ----------------------Nil
Ca3(PO4)2.4H2O ----------2
SiO2 ---------------------------8
MgF2 --------------------------Nil
Mg(OH)2----------------------0.03
MgCO3.3H2O--------------- 2.5
MgSO3.7H2O--------------- 6.5
Mg3(PO4)2.5H2O---------- 0.2
LaPO4 ------------------------ Nil
LaPO4.4H2O---------------- 2
La(OH)3 ----------------------0.1
La2(CO3)3.5H2O-----------0.2
CePO4.4H2O --------------- 3
Ce(OH)3----------------------- 0.1
Ce2(CO3)3.5H2O----------- 0.4
PrPO4.4H2O------------------0.4
Pr(OH)3-------------------------0.01
Pr2(CO3)3.5H2O-------------0.03
Nd(OH)3------------------------ 0.05
Nd2(CO3)3.5H2O------------ 0.1
NdPO4.3H2O------------------1.3
ThO2-----------------------------1000ppm
Th(PO3) 4.4H2O--------------1200ppm
CaUO4 ------------------------- 30ppm
Radiations----------------------62.29


( Total Activity concentration of Th-232 and U-238 decay chains) Bq/g 


With this detailed breakdown of WLP's Chemical compositions, one will be able to determine its 'synergistic' if any role in complementing the FGD and NUF in the 'Condisoil'(2).


The FGD Chemical Compositions :
Composition...................... Weight %
FePO4.5H2O----------------------Nil -
Fe2O3-------------------------------Nil -
Fe(OH)3---------------------------- Ni l-
Al2O3--------------------------------Ni l-
Al (OH)3-----------------------------Nil -
Al2 (SO4)3.16H2O---------------Ni l-
CaSO4. 2H2O---------------------95
CaSO4 ------------------------------Ni l-
Ca(OH)2----------------------------- 4
CaCO3------------------------------- 0.1
CaCO3.2H2O-----------------------Nil -
CaC2O4------------------------------Ni l-
Ca3(PO4)2.4H2O------------------Nil -
SiO2-----------------------------------0.6
MgF2----------------------------------0.3
Mg(OH)2----------------------------- Nil -
MgCO3.3H2O----------------------- Nil -
MgSO3.7H2O----------------------- Nil -
Mg3(PO4)2.5H2O------------------ Nil -
LaPO4--------------------------------- Nil -
LaPO4.4H2O------------------------ Nil -
La(OH)3------------------------------- Nil -
La2(CO3)3.5H2O------------------- Nil -
CePO4.4H2O------------------------ Nil -
Ce(OH)3------------------------------- Nil -
Ce2(CO3)3.5H2O------------------- Nil -
PrPO4.4H2O------------------------- Nil -
Pr(OH)3-------------------------------- Nil -
Pr2(CO3)3.5H2O-------------------- Nil -
Nd(OH)3------------------------------- Nil -
Nd2(CO3)3.5H2O------------------- Nil -
NdPO4.3H2O------------------------- Nil -
ThO2------------------------------------ Nil -
Th(PO3) 4.4H2O--------------------- Nil -
CaUO4---------------------------------- Nil -
Radiations------------------------------ 0.47 Bq/g
( Total Activity concentration of Th-232 and U-238 decay chains)


Here comes the NUF chemical compositions :
Composition ...................Weight %
FePO4.5H2O...................... -
Fe2O3................................. -
Fe(OH)3.............................. -
Al2O3.................................. -
Al (OH)3.............................. -
Al2 (SO4)3.16H2O.............. -
CaSO4. 2H2O..................... -
CaSO4.................................73.5
Ca(OH)2.............................. -
CaCO3................................ 4
CaCO3.2H2O...................... 2
CaC2O4............................... -
Ca3(PO4)2.4H2O................ 1.5
SiO2..................................... -
MgF2.................................... -
Mg(OH)2.............................. 17.5
MgCO3.3H2O....................... -
MgSO3.7H2O........................ -
Mg3(PO4)2.5H2O.................. -
LaPO4................................... 1.5
LaPO4.4H2O.......................... -
La(OH)3 ..................................-
La2(CO3)3.5H2O.................... -
CePO4.4H2O.......................... -
Ce(OH)3.................................. -
Ce2(CO3)3.5H2O.................... -
PrPO4.4H2O............................ -
Pr(OH)3.................................... -
Pr2(CO3)3.5H2O...................... -
Nd(OH)3.................................... -
Nd2(CO3)3.5H2O...................... -
NdPO4.3H2O............................. -
ThO2.......................................... -
Th(PO3) 4.4H2O........................ -
CaUO4....................................... -
Radiations.................................. 0.52Bq/g


( Total Activity concentration of Th-232 and U-238 decay chains)


The concentration of radionuclides in the rare earth products should be very low (< 0.2 Bq/g)


All figures above are from the RWMP.




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