Steam explosion pulping: a new papermaking process solves a big problem

How can the pollution caused by traditional pulping be effectively reduced? How to make full use of waste bamboo waste produced by bamboo processing companies? ...... A process developed by Fujian Lishu Pulp & Paper Co., Ltd., based in Jianye, provided a package of solutions to solve this problem and became a model for energy conservation and emission reduction of local enterprises, resulting in good economic and social benefits. .

In the papermaking process, traditional chemical pulping needs to be cooked with chemicals for about 5 hours. A ton of finished pulp consumes more than 200 kg of coal. However, in Lishu Pulp & Paper Co., Ltd., due to the steam explosion pulping process, the cans can be put out in one hour, and one ton of finished pulp consumes less than 40 kilograms of coal. Moreover, the pulping ratio of raw materials for chemical pulping is only about 40%, and the pulping rate for steamblasting pulps is as high as 75%.

In 2004, Lishu Pulp Paper settled in Jianxing Xingning Industrial Park and invested 60 million yuan. It mainly produces high-strength corrugated paper, kraft noodle box boards and environment-friendly dry wood pulp. The annual output is 50,000 tons and the output value is 100 million yuan. The company adopts the world's leading waterless and drug-free physical steam explosion pulping process, and it is the first high-efficiency physical pulping technology in our province that can make full use of waste, low investment, low cost, high slurry rate, and can fully meet the requirements of environmental protection.

According to reports, the process is connected to the corn stove steam explosion pulping technology of the company's affiliated companies. After technical personnel have tackled hundreds of times in one year, they have invested more than 8 million yuan and basically completed the technology of steam explosion pulping of waste bamboo. Conversion.

The steam explosion pulping process does not add any chemicals during the steam explosion process and is a solid slurry. There is no black liquor problem, which fundamentally solves the problem of papermaking wastewater treatment. With traditional chemical pulping, the ratio of plant raw materials to liquid chemicals is 1:4, and the mechanical pulping process also requires 4 times more water. However, the ratio of raw materials for steam explosion pulping to water is less than 1:1. In terms of emissions, only 25% of chemical and mechanical pulping is used. Moreover, one ton of dry plant material for chemical pulping consumes about 150 kilograms of chemicals, while steam explosion pulping basically eliminates the need to adjust mid-segment water pH. This company alone can save more than 1,500 yuan per day.

In fact, the green “blast” of the steam explosion pulping process brings far more benefits than this. Many local bamboo processing companies produce a large amount of scraps such as bamboo heads, bamboo tails, bamboo shoots, shavings, etc., which are not fully utilized. They are piled up along sidewalks of factories and cause environmental mess and poor roads. There are also hidden fire hazards. After the company is put into production, it can consume 150,000 tons of waste bamboo material each year, which is calculated at a purchase price of 300 yuan per ton, which can bring an unexpected income of 45 million yuan to local farmers.

In addition, the company also absorbs more than 400 rural surplus laborers, which not only reduces the pressure on employment in the society, but also directly adds 2.5 million yuan of wage income to local farmers. (Reporter Lan Feng Zhou Lin Correspondent Quan Yongguang Li Baocheng Jiang Daoming)