Preparation method of straw pulp

Abstract

The invention discloses a preparation method of straw pulp. The preparation method comprises the steps of: (1) adding straw raw materials and cooking liquor into cooking equipment according to the weight ratio being (1:3)-(1:6) and evenly mixing, and then sealing then cooking equipment, wherein the cooking liquor contains alkali; (2) introducing oxygen into the sealed cooking equipment to keep the oxygen pressure in the cooking equipment be 0.3-1.0MPa, and cooking the straw raw materials at 90-130 DEG C for 30-240 minutes by using the cooking liquor; and (3) washing and screening pulp obtained after the cooking process is completed. By adopting the preparation method of the straw pulp, provided by the invention, the advantages of the straw raw materials can be fully achieved, and the straw pulp with low hardness, high yield and good quality can be obtained.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a method for preparing straw pulp for papermaking. Background technique [0002] Grasses (such as straw and wheat straw), as an important class of plant fiber raw materials, have dominated the development of my country's pulp and paper industry in the past few decades, and have a prominent position in the world's non-wood paper industry. However, grass fiber raw materials have congenital deficiencies such as many miscellaneous cells and high silicon content, which lead to restrictive problems such as low black liquor extraction rate, serious silicon interference, and low pulping efficiency, which makes the development of grass pulp industry in recent ten years. More and more restrictions have been imposed on the remaining years, and it is hoped that wood pulping will eventually replace grass-based pulping. [0003] However, the actual situation of my country's papermaking fiber raw ma...

AI Technical Summary

Problems solved by technology

However, grass fiber raw materials have congenital deficiencies such as many miscellaneous cells and high silicon content, which lead to restrictive problems such as low black liquor extraction rate, serious silicon interference, and low pulping efficiency, which makes the development of grass pulp industry in recent ten years. More and more restrictions have been imposed on the remaining years, and people also hope that wood pulping can eventually replace grass pulping

[0003] However, the actual situation of my country's papermaking fiber raw materials is: wood resources are very limited, which is far from meeting the needs of the papermaking industry, and the hundreds of millions of tons of rice straw and wheat straw left over from the processing of agricultural products each year are used due to many problems in straw pulping. Not to mention the advantages that it should have as a papermaking resource

For example, high-yield semi-chemical pulping and mechanical pulping are difficult to meet people's requirements for paper product quality. Although chemical pulping methods can produce medium and low-end paper products, the yield is relatively low.

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