Method for producing organic fertilizer, organic complex fertilizer by using papermaking black liquor through alkaline process including process of sodium sulfite

• Main Author: XIXIN,SUN ZHAO
• Format: Patent
• Language: English
• Published: 21.02.2007
• Subjects: CHEMISTRY; FERTILISERS; FERTILISERS CHARACTERISED BY THEIR FORM; MANUFACTURE THEREOF; METALLURGY; MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS; ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE

This invention provides a method for manufacturing organic and organic-inorganic composite fertilizers using wastewater from sodium hydroxide-sodium sulfite paper production. The method comprises: (1) extracting the wastewater; (2) condensing the wastewater; (3) manufacturing lignin powder; (4) manufacturing organic and organic-inorganic composite fertilizers. The method can make good use of wastewater from paper production, protect environment and save resources. The produced organic and organi-inorganic composite fertilizers have such advantages as abundant nutrition (organic matters as well as N, P, K and trace elements), high bioactivity and long effective time, and can improve crop quality.