Method for producing sponge fertilizer from pickling waste liquid and waste lignin

Abstract

The invention discloses a method for producing a sponge fertilizer from pickling waste liquid and waste lignin, and relates to the technical field of fertilizer production process. The method comprises the steps: in a waste black liquid produced from alkaline-process pulping of a papermaking factory, adding a steel pickling waste acid liquid, then adding ammonium persulfate as a catalyst, and adding sodium superoxide as an initiator; heating the materials with hot flue gas, carrying out heat preservation for a period of time in a normal pressure vessel with stirring, and making the materials subjected to a chemical reaction, to generate modified lignin; and then cooperating with biological bacteria and nitrogen, phosphorus and potassium auxiliary materials, and thus obtaining the sponge fertilizer. The method has the beneficial effects that the wastes are used for treating the wastes, processing problems of two kinds of industrial waste liquids are solved, and the sponge fertilizer is an organic fertilizer having great gap in production agriculture, has the fertilizer efficiency significantly improved compared with similar products, can obtain remarkable economic benefits and environmental-protection benefits, and has the advantages of simple equipment, simple method, easy implementation and the like.

Description

technical field [0001] The invention relates to the technical field of fertilizer production technology, in particular to a method for producing sponge fertilizer from pickling waste liquid and waste lignin. Background technique [0002] Lignin widely exists in nature, it accounts for about one-third of land plant biomass; lignin is a complex polymer compound, it forms the main component of plant skeleton with cellulose and hemicellulose, plant photosynthesis A large part of the CO2 fixed by the action is converted into lignin, or in other words, lignin accounts for about 40% of the solar energy stored in plants through photosynthesis; in nature, the reserves of lignin are second only to cellulose, and each year All regenerate at a rate of 50 billion tons; my country's forest resources are not very rich, but there are 500-600 million tons of crop orange stalks every year; my country's pulp and paper industry will separate about 140 million tons of cellulose from plants every y...

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Problems solved by technology

[0003] In addition, the iron and steel pickling of my country's iron and steel industry produces a large amount of acid waste liquid. If pickling with sulfuric acid, the content of waste acid is about 6-8% (percentage by weight, the same below), and about 7-9% of ferrous sulfate; For pickling with hydrochloric acid, the waste acid content is about 7-9%, and the ferrous chloride is about 25-33%; these waste acids have not been rationally utilized

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