阅读说明：本技术 一种两段挤压两段浸渍的生物机械法制浆工艺 (Two-section extrusion and two-section impregnation bio-mechanical pulping process ) 是由 丁威 费旭勇 刘强利 单升来 吴宪宝 江理勇 于 2021-09-02 设计创作，主要内容包括：本发明提供一种两段挤压两段浸渍的生物机械法制浆工艺,竹片首先经过筛选,收集合格竹片切断到定长除尘用塑料袋封存,平衡水分,经热水洗涤,脱水后熏蒸,加入氢氧化钾水溶液浸泡3h以上,使其快速吸水、润胀,将竹片采用TSPI挤压机进行一段挤压,挤压后的物料进行第一段生物菌液发酵预浸,浸渍完成后进行第二段TSPI挤压,加入第二段生物菌液发酵充分混匀浸渍,浸渍后的物料进行高浓盘磨磨浆,并通过输入不同的电能,分别磨取多个不同加拿大游离度的浆样。该两段挤压两段浸渍的生物机械法制浆工艺生产的生物纸浆质量好,可以大规模或超大规模生产,是一项非常节能、省钱的制浆技术,不需要大量强碱高温蒸煮,在常温、常压条件下完成制浆,环保节能。(The invention provides a bio-mechanical pulping process by two-stage extrusion and two-stage impregnation, which comprises the steps of screening bamboo chips, collecting qualified bamboo chips, cutting the bamboo chips into fixed-length dust removal, sealing and storing the bamboo chips by using a plastic bag, balancing moisture, washing by hot water, dehydrating, fumigating, adding a potassium hydroxide aqueous solution, soaking for more than 3 hours to enable the bamboo chips to quickly absorb water and swell, carrying out one-stage extrusion on the bamboo chips by using a TSPI (transreflective synthetic spinning) extruder, carrying out fermentation and presoaking on the extruded materials by using a first-stage biological bacterial liquid, carrying out TSPI extrusion after impregnation, adding a second-stage biological bacterial liquid, fermenting, fully mixing and impregnating, carrying out high-concentration disc grinding on the impregnated materials, and respectively grinding a plurality of pulp samples with different Canadian freenesses by inputting different electric energy. The bio-paper pulp produced by the bio-mechanical pulping process with two-stage extrusion and two-stage impregnation has good quality, can be produced on a large scale or a super large scale, is a very energy-saving and money-saving pulping technology, does not need a large amount of strong alkali and high-temperature cooking, completes pulping under the conditions of normal temperature and normal pressure, and is environment-friendly and energy-saving.)

1. A bio-mechanical pulping process with two-section extrusion and two-section impregnation is characterized by comprising the following steps:

(1) firstly, screening bamboo chips, collecting qualified bamboo chips, cutting the bamboo chips to a fixed length, removing dust on the surfaces of the bamboo chips by using a dust remover, sealing and storing the bamboo chips by using a plastic bag after dust removal, balancing moisture, washing the qualified bamboo chips by hot water, dehydrating, pre-steaming and fumigating at 105 ℃, adding a potassium hydroxide aqueous solution with the mass concentration of 0.9-1% according to the solid-liquid mass ratio of 1: 8, soaking the bamboo chips for more than 3 hours at the temperature of more than 65 ℃ under normal pressure to enable the bamboo chips to quickly absorb water and swell;

(2) carrying out first-stage extrusion on bamboo chips by adopting a TSPI (TSPI) extruder, and carrying out first-stage biological bacterium liquid fermentation and presoaking on the extruded materials at the dipping temperature of about 28-35 ℃ for 3-5 days;

(3) after the impregnation is finished, carrying out second-stage TSPI extrusion, adding second-stage biological bacterium liquid, fermenting, fully mixing and impregnating, and conveying into a fermentation bin for biological fermentation for 10-12 days at the temperature of about 32-38 ℃;

(4) and (2) grinding the impregnated material by a high-concentration disc mill, respectively grinding a plurality of pulp samples with different Canadian freenesses by inputting different electric energy, washing the ground pulp, collecting extruded thick waste liquid, measuring the pH value, the residual alkali and the solid content of the waste liquid, eliminating the potential of the washed pulp, screening, measuring the Canadian freeness of the pulp sample, making the pulp into 60g/m2 paper sheets in a paper sheet former according to related standards, drying at constant temperature and humidity, measuring the physical and strength properties of the paper sheets, selecting the pulp sample with excellent physical and strength properties, and grinding the pulp according to the Canadian freeness of the pulp sample to produce the pulp in batches.

2. The bio-mechanical pulping process of claim 1, wherein the two-stage extrusion and two-stage impregnation process comprises: the fumigation time was 20 minutes.

3. The bio-mechanical pulping process of claim 1, wherein the two-stage extrusion and two-stage impregnation process comprises: the weight ratio of the biological bacterial liquid pre-soaked by the fermentation of the first section of biological bacterial liquid to the biological bacterial liquid pre-soaked by the fermentation of the second section of biological bacterial liquid to water is 1: 100.

4. The bio-mechanical pulping process of claim 1, wherein the two-stage extrusion and two-stage impregnation process comprises: the concentration of the high-concentration disc mill is 25-30%.

5. The bio-mechanical pulping process of claim 1, wherein the two-stage extrusion and two-stage impregnation process comprises: and a heat-preservation and moisture-preservation film is laid on the upper part of the fermentation bin in the second section of biological bacterium liquid fermentation.

6. The bio-mechanical pulping process of claim 1, wherein the two-stage extrusion and two-stage impregnation process comprises: the length of the cut bamboo chips is 4-6 cm.

7. The bio-mechanical pulping process of claim 1, wherein the two-stage extrusion and two-stage impregnation process comprises: the first section of biological bacterial liquid and the second section of biological bacterial liquid at least comprise compound bacteria consisting of three different strains of white rot fungi, soft rot fungi and actinomycetes, and the mass ratio of the white rot fungi to the soft rot fungi to the actinomycetes is 2:2: 3.

Technical Field

The invention relates to the technical field of biological pulping, in particular to a pulping process by a two-section extrusion and two-section impregnation bio-mechanical method.

Background

In the paper making industry, the pulp making and the paper making can be divided into two parts. Pulping is the front end of papermaking, and is a process and technology for firstly decomposing raw materials into paper pulp and secondly making the paper pulp into paper by a paper machine.

In the traditional pulping process and technology, pulping production is seriously environmental-pollution, and the pulping process is a process for decomposing lignin under the conditions of high temperature, high pressure and high alkali to obtain cellulose. The high temperature and high pressure reach 170 ℃ and 180 ℃, and the energy consumption is very high; the water consumption is large, and about 100 tons of water are used for each ton of pulp; high alkali (caustic soda) reaches 26-40%, and other various chemicals react with lignin at high temperature to generate a large amount of black liquor, which is the main cause of environmental pollution. According to the current situation of the pulping industry in China, chemical pulp is mainly used in production (namely, the traditional pulping method), and the biological pulping technology is still immature and is in an exploration stage. The main problem existing in the prior pulping production is that the waste liquid pollutes the environment, and the pollution can be reduced by the existing feasible environment-friendly new process and equipment, but the pollution cannot be eliminated, and only the pollution can be reduced. Only part of caustic soda can be recovered through large-scale environment-friendly equipment, but the production cost of enterprises is increased, the profit is greatly reduced, and the profit is slight and even the cost is lost.

Therefore, it is desirable to design a bio-mechanical pulping process with two-stage extrusion and two-stage impregnation to solve the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a bio-mechanical pulping process with two-stage extrusion and two-stage impregnation, the bio-mechanical pulping process with two-stage extrusion and two-stage impregnation has good quality of biological paper pulp, although the degradation time is longer, a large amount of equipment investment is saved, only a large storage pool or a stacking field is needed, sufficient raw material supply lays a foundation for continuous production and automatic operation, and large-scale or super-large-scale production can be guaranteed, so that the bio-mechanical pulping process is a very energy-saving and money-saving pulping technology; the technology does not need a large amount of strong alkali (caustic soda) for high-temperature cooking, completes pulping under the conditions of normal temperature and normal pressure, and is environment-friendly and energy-saving.

In order to achieve the purpose, the invention is realized by the following technical scheme: a bio-mechanical pulping process with two-section extrusion and two-section impregnation comprises the following steps:

(1) firstly, screening bamboo chips, collecting qualified bamboo chips, cutting the bamboo chips to a fixed length, removing dust on the surfaces of the bamboo chips by using a dust remover, sealing and storing the bamboo chips by using a plastic bag after dust removal, balancing moisture, washing the qualified bamboo chips by hot water, dehydrating, pre-steaming and fumigating at 105 ℃, adding a potassium hydroxide aqueous solution with the mass concentration of 0.9-1% according to the solid-liquid mass ratio of 1: 8, soaking the bamboo chips for more than 3 hours at the temperature of more than 65 ℃ under normal pressure to enable the bamboo chips to quickly absorb water and swell;

(2) carrying out first-stage extrusion on bamboo chips by adopting a TSPI (TSPI) extruder, and carrying out first-stage biological bacterium liquid fermentation and presoaking on the extruded materials at the dipping temperature of about 28-35 ℃ for 3-5 days;

(3) after the impregnation is finished, carrying out second-stage TSPI extrusion, adding second-stage biological bacterium liquid, fermenting, fully mixing and impregnating, and conveying into a fermentation bin for biological fermentation for 10-12 days at the temperature of about 32-38 ℃;

(4) and (2) grinding the impregnated material by a high-concentration disc mill, respectively grinding a plurality of pulp samples with different Canadian freenesses by inputting different electric energy, washing the ground pulp, collecting extruded thick waste liquid, measuring the pH value, the residual alkali and the solid content of the waste liquid, eliminating the potential of the washed pulp, screening, measuring the Canadian freeness of the pulp sample, making the pulp into 60g/m2 paper sheets in a paper sheet former according to related standards, drying at constant temperature and humidity, measuring the physical and strength properties of the paper sheets, selecting the pulp sample with excellent physical and strength properties, and grinding the pulp according to the Canadian freeness of the pulp sample to produce the pulp in batches.

Preferably, the fumigation time is 20 minutes.

Preferably, the weight ratio of the biological bacterial liquid pre-soaked by the fermentation of the first section of biological bacterial liquid to the biological bacterial liquid pre-soaked by the fermentation of the second section of biological bacterial liquid to water is 1: 100.

Preferably, the refining concentration of the high-concentration disc mill is 25-30%.

Preferably, a heat-preservation and moisture-preservation film is laid on the upper part of the fermentation bin in the second section of biological bacterium liquid fermentation.

Preferably, the length of the cut bamboo chips is 4-6 cm.

Preferably, the first section of biological bacterium liquid and the second section of biological bacterium liquid at least comprise compound bacteria consisting of three different strains of white rot fungi, soft rot fungi and actinomycetes, and the mass ratio of the white rot fungi to the soft rot fungi to the actinomycetes is 2:2: 3.

The invention provides a bio-mechanical pulping process with two-section extrusion and two-section impregnation. The method has the following beneficial effects:

1. the bio-paper pulp produced by the bio-mechanical pulping process with two-stage extrusion and two-stage impregnation has good quality, saves a large amount of equipment investment although the degradation time is longer, only needs a large storage tank or a stacking field, and sufficient raw material supply lays a foundation for continuous production and automatic operation, can provide guarantee for large-scale or super-large-scale production, and is a pulping technology with very energy conservation and money saving; the technology does not need a large amount of strong alkali (caustic soda) for high-temperature cooking, completes pulping under the conditions of normal temperature and normal pressure, and is environment-friendly and energy-saving.

Detailed Description

The invention will be further described with reference to specific embodiments:

a bio-mechanical pulping process with two-section extrusion and two-section impregnation comprises the following steps:

(1) firstly, screening bamboo chips, collecting qualified bamboo chips, cutting them into fixed length, making the length of cut bamboo chips be 4-6 cm, using dust-removing machine to remove dust on the surface, sealing and storing them with plastic bag, balancing water content, firstly washing qualified bamboo chips with hot water, dewatering, pre-steaming at 105 deg.C for 20 min, adding 0.9-1% potassium hydroxide aqueous solution at solid-liquid mass ratio of 1: 8, soaking at 65 deg.C for more than 3 hr under normal pressure to rapidly absorb water and swell, preparing zymogen liquid, the first section and the second section at least comprise compound bacteria composed of white rot bacteria, soft rot bacteria and actinomycetes, the mass ratio of the white rot fungi to the soft rot fungi to the actinomycetes is 2:2:3, and the weight parts of the biological bacteria liquid pre-soaked by the fermentation of the first section of biological bacteria liquid and the biological bacteria liquid pre-soaked by the fermentation of the second section of biological bacteria liquid to water are 1: 100;

(2) carrying out first-stage extrusion on bamboo chips by adopting a TSPI (TSPI) extruder, and carrying out first-stage biological bacterium liquid fermentation and presoaking on the extruded materials at the dipping temperature of about 28-35 ℃ for 3-5 days;

(3) after the impregnation is finished, carrying out second-stage TSPI extrusion, adding second-stage biological bacterium liquid, fermenting, fully mixing and impregnating, conveying into a fermentation bin for biological fermentation for 10-12 days at the temperature of about 32-38 ℃, and paving a heat-preservation and moisture-preservation film on the upper part of the fermentation bin during the second-stage biological bacterium liquid fermentation;

(4) and (2) grinding the impregnated material by a high-concentration disc mill, wherein the grinding concentration of the high-concentration disc mill is 25-30%, grinding a plurality of pulp samples with different Canadian freeness respectively by inputting different electric energy, washing the ground pulp, collecting the extruded thick waste liquid, measuring the pH value, the residual alkali and the solid content of the waste liquid, wherein the measurement is of great significance for subsequent wastewater treatment and environmental protection evaluation, after the washing, the pulp is subjected to latency elimination and screening, measuring the Canadian freeness of the pulp sample, making 60g/m2 paper in a paper former according to relevant standards, drying at constant temperature and humidity, measuring the physical and strength properties of the paper, selecting the pulp sample with excellent physical and strength properties, and grinding according to the Canadian freeness of the pulp sample to produce the pulp in batches.

The bio-paper pulp produced by the bio-mechanical pulping process with two-stage extrusion and two-stage impregnation has good quality, saves a large amount of equipment investment although the degradation time is longer, only needs a large storage tank or a stacking field, and sufficient raw material supply lays a foundation for continuous production and automatic operation, can provide guarantee for large-scale or super-large-scale production, and is a pulping technology with very energy conservation and money saving; the technology does not need a large amount of strong alkali (caustic soda) for high-temperature cooking, completes pulping under the conditions of normal temperature and normal pressure, and is environment-friendly and energy-saving.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.