FIELD: chemistry.
SUBSTANCE: caustic soda is substituted with cheap lime and complexing, flocculation and acid-base neutralisation of aluminium sulphate are additionally used, the useful ingredients contained in black liquor are reused, output close to the yield of pulp is achieved, high-quality pulp is produced, cyclical utilisation of black liquor is carried out, and the problem of its pollution is solved.
EFFECT: highly effective pulp production.
10 cl
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