Alkaline liquid purification device and method

Abstract

The invention discloses an alkaline liquid purification device and method, and belongs to the technical field of viscose fiber production. The alkaline liquid purification device comprises a raw material alkaline liquid barrel, a fluidized bed separator, a compressed air pipeline I, an exhaust gas discharging pipeline, a wastewater discharging pipeline, a soft water pipeline, a compressed air pipeline II and a filtrate output pipe. Before raw material alkaline liquid enters a nanofiltration system, the fluidized bed separator is used to replace a traditional plate and frame filter for filtering, and the opening and closing of a valve are controlled to control the opening and closing of pipelines connected to the fluidized bed separator; automatic filtration and backwashing processes of thefiltering system are realized; the production difficulty is reduced, and manpower is saved.

Description

technical field [0001] The invention belongs to the technical field of viscose fiber production, specifically relates to an alkali liquor purification device and method, and is also applicable to the technical field of papermaking. Background technique [0002] During the pulp impregnation process, a large amount of fine fibers, silt, resin, semi-fiber and other impurities will be brought into the lye, and the impurities in the lye will prevent the lye from penetrating the pulp to a certain extent and form alkali fibers. Reaching a certain content will have a corresponding impact on pulp impregnation. Therefore, the lye after impregnation needs to pass through the metal plate frame, polypropylene plate frame, or even nanofiltration membrane before it can be used for impregnation again. [0003] At present, viscose staple fiber enterprises have the following two types of lye that need to be purified and recycled: one is squeezed lye; the other is substituted lye. In the pri...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that in the process of purifying lye containing impurities such as fibers, silt, and resins in the existing viscose production process, the lye needs to be filtered through a filter device before entering the nanofiltration system, while the existing filter Most of the devices use plate-and-frame filters, and the cleaning process of plate-and-frame filters is difficult. The process of dismantling the plates and frames requires a lot of labor and wastes a lot of lye. The fluidized bed separator is used for filtration. According to the production needs of the viscose industry, the corresponding pipeline is connected, and the opening and closing of the pipeline connected to the fluidized bed separator is controlled by controlling the opening and closing of the valve, so as to realize the automatic filtration and backwashing process of the filtration system.

Images