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Method for preparing chemithermomechanical pulp from corn straw by potash process and extracting pulping waste liquid to prepare fertilizer

A technology of corn stalks and pulping waste liquid, which is applied in the direction of alkaline orthophosphate fertilizer, fertilizer mixture, ammonium orthophosphate fertilizer, etc., can solve problems such as difficult to implement, not specific enough, pulping process is not clearly stated, and achieve The effect of complete process, reduced operating costs, and increased farmers' income

Active Publication Date: 2020-09-22
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] published by the State Intellectual Property Office "The Method of Utilizing Potassium Hydroxide Alkali Method for Papermaking Pulping Black Liquor to Produce Fertilizers" (patent application number: 03122742.2), although mentioned Using potassium hydroxide alkali pulping black liquor to produce fertilizers, but the raw materials involved are too broad and not specific enough, and the pulping process is not clearly stated, so it is difficult to implement in actual operation

Method used

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  • Method for preparing chemithermomechanical pulp from corn straw by potash process and extracting pulping waste liquid to prepare fertilizer

Examples

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Effect test

Embodiment 1

[0023] The corn stalks of this embodiment were taken from a papermaking enterprise in Liaoning, and were not separated from the skins and stalks, and were whole corn stalks. The preparation of corn stalk chemical pulp by KOH pre-impregnation and refining, and preparation of fertilizer from the pulping waste liquid include the following steps:

[0024] (1) The process parameters of the pre-impregnation are 5.6% of the pre-impregnated potassium hydroxide, the liquid ratio is 1:5, the maximum temperature is 130°C, and the heat preservation time is 30 minutes. The process parameters of the refining are as follows: the concentration of the refining slurry is 20%, the refining gap is 0.5mm, 0.3mm, 0.1mm, 0.1mm, four stages of refining, after screening, the corn stalk chemical mechanical pulp is prepared;

[0025] (2) The screw extruder extracts the pulping waste liquid, which can be concentrated and granulated to produce organic fertilizer. Add 310kg ammonium phosphate to each ton of was...

Embodiment 2

[0028] The corn stalks of this embodiment were taken from a papermaking enterprise in Liaoning, and were not separated from the skins and stalks, and were whole corn stalks. The preparation of corn stalk chemical pulp by KOH pre-impregnation and refining, and preparation of fertilizer from the pulping waste liquid include the following steps:

[0029] (1) The process parameters of pre-impregnation are 6.0% potassium hydroxide, the liquid ratio is 1:4, the maximum temperature is 130°C, and the heat preservation time is 30 minutes. The process parameters of the refining are as follows: the concentration of the refining slurry is 20%, the refining gap is 0.5mm, 0.3mm, 0.1mm, three stages of refining, after screening, the corn stalk chemical pulp is prepared;

[0030] (2) The screw extruder extracts the pulping waste liquid and concentrates it to 35% solid content to produce organic liquid fertilizer. Add 50kg of ammonium bicarbonate and 300kg of diammonium hydrogen phosphate to each t...

Embodiment 3

[0033] The corn stalks in this embodiment were taken from a farm in Beijing, and were not separated from the hides and stalks, and were whole corn stalks. The preparation of corn stalk chemical pulp by KOH pre-impregnation and refining, and preparation of fertilizer from the pulping waste liquid include the following steps:

[0034] (1) The process parameters of the pre-impregnation are 6.0% of the pre-impregnated potassium hydroxide, the liquid ratio is 1:5, the maximum temperature is 110°C, and the heat preservation time is 30 minutes. The process parameters of the refining are as follows: the concentration of the refining slurry is 25%, the refining gap is 0.5mm, 0.3mm, 0.1mm, three stages of refining, after screening, the corn stalk chemical pulp is prepared;

[0035] (2) The screw extruder extracts the pulping waste liquid, which can be concentrated and granulated to obtain organic fertilizer. Adding 260kg of diammonium hydrogen phosphate to each ton of waste liquid solids can...

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Abstract

The invention discloses a method for preparing chemithermomechanical pulp from corn straw by a potash process and extracting pulping waste liquid to prepare a fertilizer, and relates to the technicalfield of pulping and papermaking utilizing agricultural solid wastes and resource utilization of the waste liquid in the pulping process. Corn straw is pre-impregnated with a potassium hydroxide solution and then ground into pulp to obtain corn straw chemithermomechanical pulp, and the pulp can be used for preparing qualified corrugating medium paper without being matched with other paper pulp; anorganic fertilizer can be prepared from the waste liquid generated in the pulping process only by concentration or granulation without the need of adding nutrients, and an organic-inorganic compoundfertilizer can be prepared by adding related nutrients for concentration and granulation. A complete process for preparing chemithermomechanical pulp by pre-impregnating and grinding corn straw and preparing a fertilizer from pulping waste liquid is provided by the invention, the process is complete, the implementation process is simple, the potential of straw fiber raw material pulping and papermaking is explored, and the fertilizer prepared from the waste liquid is used for agricultural production, and therefore resource cyclic sharing of the pulping and papermaking industry and agriculturalproduction is embodied, and sustainable development of the two industries is promoted.

Description

Technical field [0001] The invention relates to the technical field of agricultural solid waste pulping and papermaking and the resource utilization of waste liquid in the pulping process, in particular to a method for preparing corn stalk potash process mechanical pulp and extracting pulping waste liquid to make fertilizer. Background technique [0002] Insufficiency of fiber raw materials has always been a bottleneck restricting the sustainable development of China's paper industry. According to the "White Paper on Sustainable Development of China's Paper Industry", my country's paper fiber raw materials are dependent on foreign sources as high as 50% and are affected by the waste paper import policy. , After 2018, the import volume of waste paper has decreased significantly, and this problem has become more prominent. Therefore, it is urgent to choose suitable papermaking fiber raw materials to replace part of wood pulp and waste paper pulp. As a by-product of crops, corn stal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G3/80C05G5/12
CPCC05G3/00C05G3/40C05G3/80C05G5/12C05B7/00C05D1/00C05F11/00C05C3/00
Inventor 范述捷苏振华龚琛
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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