Method of using black liquid extracted during pulping of corn straw through bioenzyme pretreatment and potassium hydroxide alkaline process to produce potassium fulvate organic fertilizer

Abstract

The invention discloses a method of using black liquid extracted during pulping of corn straw through bioenzyme pretreatment and a potassium hydroxide alkaline process to produce potassium fulvate organic fertilizer and belongs to the field of fertilizer production. The method includes three steps of bioenzyme pretreatment of corn straw, extraction of corn straw black liquid through the potassium hydroxide alkaline process and production of the potassium fulvate organic fertilizer, wherein the step of bioenzyme pretreatment of the straw corn includes: wet-process material preparation, bioenzyme pretreatment of the corn straw and storage of black liquid rich in potassium fulvate, the step of extraction of the black liquid by pulping the corn straw through the potassium hydroxide alkaline process includes: extruding of the corn straw pretreated by bioenzyme, mixing of the corn straw and potassium hydroxide liquid in a pre-soaking machine, steaming and discharging through a spherical boiler and collection and storage of the black liquid after being steamed, and the step of production of the potassium fulvate organic fertilizer includes: evaporation and concentration of the black liquid, treatment through a gunite granulating machine and a hot-cold screening system and packing of organic fertilizer finished products. By the method, waste is changed into wealth, the black liquid high in concentration is prepared through evaporation and concentration, and the potassium fulvate organic fertilizer having high activity is produced finally.

Description

technical field [0001] The invention belongs to the extension of the technical field of papermaking and extends to the field of agricultural production of organic fertilizers, and specifically relates to a method of extracting potassium fulvic acid organic fertilizer from the black liquor produced in the pulping process of corn stalks by biological enzyme pretreatment + potassium hydroxide alkali method Methods. Background technique [0002] At present, the cooking of paper mills generally uses the reaction process of chemical dissolution and lignin removal. The general chemical pulping not only needs to use various chemicals, but also has high cost and high energy consumption. If the black pulp produced If the liquid is directly discharged into the sewage treatment plant, the cost of sewage treatment will be greatly increased. [0003] Fertilizer is a direct or indirect supplier of nutrients needed for crop growth, and has the function of improving soil properties and impr...

AI Technical Summary

Problems solved by technology

"Method of Producing Fertilizer Using Potassium Hydroxide Alkaline Papermaking Black Liquor" (patent application number: 03122742.2), although it talks about the use of potassium hydroxide alkali method to produce fertilizers from papermaking pulping black liquor, but the mentioned raw materials and preparation The process is too broad, not specific and clear, and it is difficult to implement it in actual operation

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