Inorganic residual from kraft or soda pulping separated from green liquor in the chemical recovery cycle.

Oxidising properties

Description of key information

There are no constituents or chemical groups present in Green liquor sludge that could be associated with oxidative properties, whicht would lead to classification if tested. For Green liquor sludge, danger of oxidative properties is not a concern and no classification is needed.

Key value for chemical safety assessment

Oxidising properties:

no

Justification for classification or non-classification

The chemical structure of Green liuqor sludge and its manufacturing process does not indicate the presence of highly oxidizing constituents or remarkable oxidizing potential. GLS is separated from a liquid (pulp mill green liquor), which is known to be a reducing solution rather than oxidizing.

 

Green liquor sludge contains mineral constituents, which may in theory have some potential for spontaneous but generally slow oxidation-reduction reactions. However, these constituents cannot be regarded as highly reactive or highly unstable groups. GLS has a high content of carbonates. Normally carbonates have flame retarding properties since CO₂ is evolved in heating.

 

The known structure does not indicate that GLS would present a danger of oxidation and increase the burning rate or burning intensity of a combustible test reference substance, under the conditions of the test as described in Test Guideline A.17. Oxidising properties (solids) of the EC Regulation No 440/2008.

 

The molecular/ionic structure of GLS and its constituents do not indicate the presence of highly oxidizing constituents or remarkable oxidizing potential. For Green liquor sludge, danger of oxidative properties is not a concern and no classification is needed.