Process and device for abstracting lignose with zero discharge of paper making black liquor

Abstract

The invention provides a method for extracting lignose with zero discharge of paper making black liquors and a device thereof. The method is mainly applicable to wood such as wheat straws, rice straws, sugar cane waste, cotton straws, eulaliopsis binata, reeds and bamboos; the wood after being selected is put in a spherical digester, a sauce pan or a continuous digester, sprayed in a spraying bin after the manganese value is obtained and sent to a twin screw squeezing pulp machine or other squeezing pulp equipment for squeezing by a screw discharging machine, and the high consistency black liquors are extracted by steam-boiling, and dilute liquors left in fibers are sent back to a boiler for recycling use; in the system adopting the low temperature condensation negative pressure principle, black liquors are automatically sucked in a reaction kettle for condensation reaction due to vacuum; after instant contact drying, grain-sized dry powder by products are generated. The method of the invention has the advantages of completely resolving the problem of back liquor pollution in the paper making industry because of clearing away the very root, improving the transfer ratio of resource reutilization and protecting the environment, along with low equipment cost, low cost and good economic benefits.

Description

technical field [0001] The invention relates to a method and device for extracting lignin, in particular to a method and device for extracting lignin from papermaking black liquor with zero discharge. Background technique [0002] The black liquor produced by papermaking raw materials (wood, rice straw, reed, sugarcane slag, etc.) is the largest pollution source in the papermaking industry, and the pollution of papermaking black liquor accounts for more than 90% of the whole papermaking process. Whether the pollution of papermaking black liquor is completely controlled is the key core technology of black liquor treatment, and it is also the key to whether papermaking black liquor can achieve zero discharge. [0003] In the production of pulp and paper, there are three main sources of pollution: one is from cooking waste liquid; The pulp industry has its own characteristics, high energy consumption, high water consumption, high pollutant discharge, difficult black liquor tre...

AI Technical Summary

Problems solved by technology

This method completely solves the problem of black liquor pollution in the paper industry, treats the root cause from the source, and improves the conversion rate of resource recycling energy; at the same time, it has less investment, low cost, good economic benefits and protects the environment.

Images