Industrial fertiliser, a crystalline substance that is white to whitish-grey, sometimes pinkish-grey, is created as a by-product of caprolactam production In recent years, particularly in connection with the desulphurisation of power plants, ammonium sulphate has become an increasingly important fertiliser with sulphur and ammoniacal nitrogen content. It is used for direct fertilisation or as a raw material in the production of mixed fertilisers containing sulphur.
| Total (ammoniacal) nitrogen as N, min. |
% weight |
20,6 |
SOP-A-169 |
| Water-soluble sulphur as S, min. |
% weight |
23,6 |
SOP-A-169 |
| Humidity, max. |
% weight |
0,8 |
SOP-A-169 |
| Free sulphuric acid, max. |
% weight |
0,1 |
SOP-A-169 |
| Fall-through ratio under 0.20 mm sieve, max. |
% weight |
10,0 |
SOP-A-169 |
| Presence of the hydrophobisation mixture |
– |
satisfactory |
SOP-A-169 |