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PM2.5 filter paper taking forestry waste as raw material and preparation method thereof

A technology for filter paper and slurry, which is applied in pulp beating/refining methods, filter paper, filtration separation, etc., can solve the problems of high price and achieve low price, good social and environmental benefits, and good effect

Active Publication Date: 2017-12-29
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country is still at a backward stage in the research and development of PM2.5 filter materials. Many industrial and civilian filter materials need to be imported from abroad, and the price is very expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: natural zeolite modification: adding the natural zeolite after cleaning, filtering and drying to the reactor, adding a concentration of 1mol L by solid-liquid ratio 1:15g / ml -1 The oxalic acid solution was stirred at a constant speed for 2 hours at 85°C, filtered, washed with water, dried in an oven at 105°C for 10 hours, cooled and ground to a particle size of 20-30 μm for use. According to the standard of 30% degree of sulfidation and 18% of the amount of alkali used, the cooking liquid was prepared; according to the liquid ratio of 1:5, the forestry waste was added to the cooking liquid for cooking, and the temperature of the cooking pot was adjusted to 150° C., and the cooking was carried out for 2 hours to obtain the obtained product. Need slurry. Refining the obtained slurry to a beating degree of 25°SR, adding modified zeolite, the absolute dry weight ratio of zeolite to slurry is 5:95, mixing evenly, and then making paper, pressing, and drying. PM...

Embodiment 2

[0023] Embodiment 2: natural zeolite modification: adding the natural zeolite after cleaning, filtering and drying to the reactor, adding a concentration of 0.5mol L by solid-liquid ratio 1:10g / ml -1 The oxalic acid solution was stirred at a constant speed for 3 hours at 75°C, filtered, washed with water, dried in an oven at 100°C for 8 hours, cooled and ground to a particle size of 30-40 μm for use. According to the standard of 28% degree of sulfidation and 20% of the amount of alkali used, the cooking liquid is prepared, and the forestry waste is added to the cooking liquid according to the liquid ratio of 1:5.0 for cooking. slurry. Refining the obtained slurry to a beating degree of 29°SR, adding modified zeolite, the absolute dry mass ratio of zeolite to slurry is 10:90, mixing evenly, and then making paper, pressing, and drying. PM2.5 filter paper. Paper machine width 1880mm, wire speed 250m / min, shaking amplitude 8mm, frequency 250 times / min, paper weight 80g / m 2 .

Embodiment 3

[0024] Embodiment 3: natural zeolite modification: adding the natural zeolite after cleaning, filtering and drying to the reactor, adding a concentration of 0.6mol L by solid-liquid ratio 1.2:10g / ml -1 The oxalic acid solution was stirred at a constant speed for 2 hours at 85°C, filtered, washed with water, dried in an oven at 105°C for 9 hours, cooled and ground to a particle size of 40-50 μm for use. According to the standards of 25% degree of sulfidation and 15% alkali amount, the cooking liquid was prepared, and the forestry waste was added into the cooking liquid according to the liquid ratio of 1.2:5 for cooking, and the temperature of the cooking pot was adjusted to 160°C for 2 hours to obtain Need slurry. Refining the obtained slurry to a beating degree of 32°SR, adding modified zeolite, the absolute dry mass ratio of zeolite to slurry is 8:92, mixing evenly, and then making paper, pressing, and drying. PM2.5 filter paper. Paper machine width 2640mm, wire speed 300m / ...

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PUM

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Abstract

The invention discloses a method for preparing a PM2.5 filter paper by taking forestry waste as a raw material. The PM2.5 air filter paper prepared according to the method not only effectively utilizes abundant fiber raw materials in the forestry waste and reduces the waste of biomass energy but also can deal with present serious PM2.5 air pollution and has higher social economic value. The key point of preparing the PM2.5 filter paper according to the method comprises the two aspects of cooking pulping process of the forestry waste and modifying process of natural zeolite. The forestry waste is selected for cooking and pulping and is prepared into a usable unbleached pulp, and then the oxalic acid modified natural zeolite is used as a filling material for manufacturing the paper. The natural zeolite is a hydrous framed porous aluminosilicate ore; after the natural zeolite is modified with acid, the natural zeolite has strong adsorptive property and is capable of adsorbing PM2.5 grains; compared with other PM2.5 adsorbing materials, the product prepared according to the method has the advantages of lower cost, lower technical difficulty, no secondary pollution and capability of effectively utilizing waste resources and natural minerals.

Description

technical field [0001] The invention relates to the technical field of processing methods for forestry waste. Background technique [0002] Every year, about 350 million tons of residual waste will be produced during forestry logging and processing in my country. The utilization rate of these resources has reached more than 50%. If they are developed into energy, they are equivalent to 80 million tons of oil resources. However, the utilization rate of forestry waste in our country is very low at present, and a large number of plant resources are not fully utilized and are discarded, which is far from the goal of building a resource-saving society in our country. As an important component of biomass energy, forestry resources will surely play a more important role in the future. [0003] The current main method of dealing with forestry waste in my country is natural incineration or incineration to generate electricity, which not only pollutes the environment, but also causes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/08D21C7/00D21D1/20D21F1/10D21F3/00D21F5/00D21H17/69D21H11/02
CPCD21C7/00D21D1/20D21F1/10D21F3/00D21F5/00D21H11/02D21H17/69D21H27/08
Inventor 陈华沙力争赵会芳胡志军周佳楠
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY