Back-washing regeneration method of ceramic membrane method brine refining process filter

Abstract

The invention relates to the technical field of chlor-alkali chemical industry production, in particular to a back-washing regeneration method of a ceramic membrane method brine refining process filter; the ceramic membrane method primary brine filtering refining process is a novel refined brine filtering production process in chlor-alkali industry brine refining process at home and abroad; at present, the process has the disadvantages of high back-washing frequency and unclean silt removal, and a primary filtering side membrane pipe is easy to block by bridging brine sludge in crude brine and fiber matters, so as to cause the primary filtering pressure to be raised to above 0.5MPa, stopping is needed to carry out regeneration cleaning, and the normal production is affected. In the invention, crude brine is adopted and flows backwards from two grades to one grade, and back-washing is carried out for a plurality of times forcibly at the refined brine side, one-grade filtering pressure of the filter can be reduced below 0.3MPa, normal production is restored, and the production running time can be increased.

Description

technical field [0001] The invention relates to the technical field of brine refining technology in chlor-alkali chemical industry, in particular to a backwash regeneration method for a ceramic membrane method brine refining process filter. Background technique [0002] The ceramic membrane primary brine refining process is a new type of refined brine filtration production process in the brine refining process of the chlor-alkali industry at home and abroad. This process is popularized in domestic chlor-alkali industry in primary brine refining due to its advantages and characteristics such as short process flow, less equipment, less land occupation, low investment, low operating cost, and less auxiliary chemical refining agent. At present, the five chlor-alkali enterprises that use sea salt as raw material have high recoil frequency, unclean desilting, and membrane tubes on the primary filter side are easily blocked by salt mud and fibrous objects in coarse brine during pro...

AI Technical Summary

Problems solved by technology

At present, the five chlor-alkali enterprises that use sea salt as raw material have high recoil frequency, unclean desilting, and membrane tubes on the primary filter side are easily blocked by salt mud and fibrous objects in coarse brine during production and operation, resulting in The primary filtration pressure is as high as 0.5MPa or more. Due to the small pressure difference, recoil failure (recoil pressure 0.45-0.5MPa; primary normal working pressure 0.35-0.4MPa) the filter flux decays, and the phenomenon that the filter has to be stopped for regeneration and cleaning

The regeneration and cleaning cycle is short, usually 7-10 days, and the production and operation efficiency is low, which affects the high-flux production capacity of the ceramic membrane and seriously affects the normal production

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