Hebei's first green pulping technology with raw ma

2022-08-17
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Hebei's first green pulping technology straw pulp papermaking regeneration

straw based papermaking straw pulp is separated into primary color clean pulp, clear liquid and solid after two technical treatments after passing through four extruders and a centrifuge. Clean pulp directly enters the papermaking process after environmental protection bleaching, which will not produce intermediate pollution. What will cause errors; The clear liquid is reused for pulping through the pipeline; On June 29, Shijiazhuang zhuangdi pulp Co., Ltd. saw that this new pulping process achieved zero black liquor, zero waste water and zero solid waste discharge

this technology has successfully solved the worldwide problem of black liquor pollution of straw pulp papermaking, which puzzles the papermaking industry. A few days ago, after the identification of the expert group of the Provincial Department of science and technology, the raw material environmental pulping technology presided over by Liang Zhilin, a retired professor of the school of science of Hebei University of science and technology, is considered to have reached the domestic leading level, which is of great significance for the technological upgrading and sustainable development of China's non wood pulping and papermaking industry

at the working pressure level of 7.5 bar, it is a large country in the production and consumption of paper and paperboard. Can the impact test be realized on the universal experimental machine in the last century? Before the 1990s, straw pulp accounted for more than 85% of China's papermaking raw materials. However, due to the serious pollution of the environment and difficult to control, the black liquor produced by straw pulp papermaking, the state began to restrict straw pulp production in 2003, and almost all straw pulp production enterprises were shut down, The required gap can only be made up by importing wood pulp and waste paper. According to the statistics of the provincial paper industry association, up to now, more than 120 enterprises have been shut down in our province, and 1.8 million tons of backward production capacity have been eliminated, resulting in a pulp demand gap of more than 1.5 million tons in the province

the green pulping technology of raw materials breaks the end intervention idea of studying how to treat black liquor before it is produced in the past. Instead, starting from the characteristics of straw pulp, the pollution control and pulping process are carried out simultaneously, so that the extraction rate of black liquor in straw pulp can reach more than 99%, and the separated primary color clean pulp can directly enter the papermaking process. After special customized precipitation treatment, the black liquor can be separated into reusable clear liquor and reusable lignin solids. It is estimated that due to the reuse of clear liquid for pulping, the consumption of clean water per ton of pulp is controlled within 15 tons, and the production water consumption is only 1/16 of the national standard; The high-strength corrugated paper made of lignin solids produced by ton pulp can also bring 700 yuan of economic benefits

Liang Zhilin said that this technology can be widely applied to non wood fiber raw materials including wheat straw, straw, reed, bamboo, hemp, bagasse, short fiber and so on. It will be of great significance to break through the bottleneck of raw material supply in China's paper industry and get rid of the situation of being subject to foreign imported wood pulp

this technology will bring the straw pulp paper industry with agricultural waste as raw material back to life. Yuan Yuegang, chairman of the appraisal committee and senior engineer of the provincial environmental protection department, believes that according to the planting area of small impact samples of wheat in our province is 36 million mu, with an annual output of about 10.8 million tons of wheat straw, using this technology can make our province produce 4million tons of paper straw pulp, realize profits and taxes of 7.208 billion yuan, and increase farmers' additional income of more than 3 billion yuan. This will bring about a revolution in the paper industry

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