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Continuous hot grinding mechanical straw pulp preparation method

A technology of straw pulp and thermal grinding, which is applied in the field of papermaking, can solve problems such as increased cost, reduced pulp yield, and increased wastewater concentration, and achieves the effects of compact production process, less raw material consumption, and less water consumption

Inactive Publication Date: 2022-04-01
王锡鹏
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most important thing is that the previous technology relied too much on the role of chemical raw materials such as alkali and acid, and did not make good use of the heat-resistant conditions of organic substances such as lignin. During the pulping process, the thermally expanded plant raw materials were washed with water and cooled. , so that the fiber raw material is cold-shrinked, so more alkali is used, which not only breaks the macromolecules of a large number of plant raw materials, peels off into small molecules and dissolves them in the sewage, but also reduces the pulping yield and increases the cost. If the concentration increases, if the waste water is not treated at an increased cost, the enterprise will close due to environmental pollution
Thermomechanical straw pulp has not been reported

Method used

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  • Continuous hot grinding mechanical straw pulp preparation method
  • Continuous hot grinding mechanical straw pulp preparation method
  • Continuous hot grinding mechanical straw pulp preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Continuous thermal grinding mechanical rice straw pulp preparation method (SMRM method):

[0039] see figure 1 , through clean production and meticulous treatment to reduce the generation of pollutants, the steps are as follows:

[0040] First, the S stage process: the main function of this stage is to wash the grass tablets with water. The straw is cut into sections, and the straw specification after cutting: 30mm-60mm (more than 70%). The raw materials are sent to the pulper for washing and concentration after dedusting, and its function is to remove dust, sand, grass blades and impurities carried by the raw materials. It is the pretreatment stage of pulping to reduce the consumption of heat and other pulping in the next stage, and to make the raw materials clean and clean. More importantly, the wastewater in this stage is easy to settle, which is beneficial to the recovery of wastewater and the recycling of sediment.

[0041] Second, the first M stage process: the...

experiment example

[0061] Comparison of some experimental data measured by this method:

[0062] In the practice of simulating actual production, some key technical conditions, that is, data, are the inevitable requirements and key points for SMRM (no acid and alkali) continuous heat grinding rice straw pulp technology. The main technical data and comparison of key steps are as follows:

[0063] 1. The raw materials must be washed before refining and pulping, because the waste water at this stage is easy to recycle without pollution, so that the water consumption per ton of pulp is controlled within 10 tons. The maximum does not exceed 12 tons. The water consumption at this stage is about 2 per ton of pulp.

[0064] 2. Coarse refining concentration: Coarse refining is the basis of fine refining. It is a preparation for fine refining to meet the pulping requirements. It grinds the cut and washed forage into coarse fibers to facilitate heat absorption and The fibers swell. When the concentrati...

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Abstract

The invention relates to the field of papermaking, in particular to a continuous hot-grinding mechanical straw pulp preparation method. The straw pulp is suitable for producing corrugating base paper, case board, bobbin paper pulp and the like, other types of packaging paper can be produced by using the pulp according to a certain proportion, and the pulp can be used for preparing cultural paper and the like after being subjected to proper process treatment such as bleaching and the like. The method comprises the following steps: (1) washing; (2) conveying the straw raw material by a spiral conveyor, introducing steam for heating at the temperature of 60-80 DEG C during conveying, conveying the heated straw raw material into a pulping machine by a conveyor, and carrying out coarse grinding at the pulping temperature of 60-80 DEG C and at the pulping concentration of 30-50%; and (3) directly feeding the coarse pulp subjected to coarse grinding into a screw conveyor, continuously introducing steam at the temperature of 60-80 DEG C, feeding the heated straw raw material into a pulping machine through the screw conveyor, and finely grinding at the pulping temperature of 60-80 DEG C and the pulping concentration of 30-50%. And (4) screening and concentrating to obtain the straw pulp. The method realizes alkali-free pulping and has the characteristics of environmental protection, low cost and high efficiency.

Description

technical field [0001] The invention relates to the field of papermaking, namely a method for preparing rice straw pulp with continuous thermal grinding machinery. The straw pulp is suitable for the production of corrugated base paper, cardboard, bobbin paper pulp, etc. It can also be used to produce other types of packaging paper with a certain proportion of the pulp. Use paper etc. Background technique [0002] In the prior art, fiber raw materials can only be made into pulp because lignin and other organic matter in grass (including Gramineae) wood are afraid of high temperature, acid, alkali, etc. So far, acid or alkali methods are used in the world to extract fibers for papermaking or chemical fiber weaving. Fibers produced by mechanical methods can only be used for papermaking and not for weaving. Taking alkaline pulping as an example, the amount of alkali used in chemical pulping is gradually reduced from 20%. The amount of alkali used in semi-chemical pulping has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21H11/12
Inventor 王锡鹏
Owner 王锡鹏
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