Inorganic ceramic membrane washing method

Abstract

The invention discloses an inorganic ceramic membrane washing method comprising the following steps: considering citric acid as an acid washing agent to carry out the acid-washing on an inorganic ceramic membrane, and adding sodium dodecyl sulfate in an alkaline washing agent to carry out the alkaline-washing on the inorganic ceramic membrane. Through the use of the inorganic ceramic membrane washing method, the difficulty in purchase and transportation caused by that nitric acid is used as an acid washing agent is solved, the eutrophication of the water body caused by that nitric acid is used as the acid washing agent is avoided, the field operation environment is improved, the production safety risk is reduced, and the alkaline-washing effect is enhanced greatly since an assistant washing agent (namely, sodium dodecyl sulfate) is added at the alkaline-washing stage.

Description

technical field [0001] The invention relates to the field of iron and steel production, in particular to an inorganic ceramic membrane cleaning method. Background technique [0002] In the field of steel, the inorganic ceramic membranes in cold rolling, silicon steel and stainless steel emulsion systems all need to be cleaned. At present, in the domestic iron and steel industry, nitric acid is generally used as acid cleaning agent and sodium hydroxide as alkaline cleaning agent for pickling of inorganic ceramic membrane ultrafiltration devices. Since nitric acid is a high-risk chemical, there are problems such as procurement and transportation difficulties, and high production safety risks. In addition, the wastewater cleaned with nitric acid contains high concentrations of nitrate nitrogen. On the one hand, it puts forward higher requirements for denitrification of the wastewater treatment process, which is not conducive to simplifying the process and saving investment; on...

AI Technical Summary

Problems solved by technology

Since nitric acid is a high-risk chemical, there are problems such as procurement, transportation difficulties, and high production safety risks.

In addition, the wastewater cleaned with nitric acid contains high concentrations of nitrate nitrogen. On the one hand, it puts forward higher requirements for denitrification of the wastewater treatment process, which is not conducive to simplifying the process and saving investment; on the other hand, it also brings eutrophication of the water body. risks of

In the industry, many experts believe that citric acid is not suitable as a pickling agent for inorganic ceramic membranes. The reason is that citric acid is a weak acid and the cleaning effect should be poor.

In addition, the cleaning effect of using sodium hydroxide without adding other auxiliary cleaning agents in the alkaline cleaning stage is generally not ideal, and there is no good solution for adding any auxiliary cleaning agent to the alkaline cleaning effect of the inorganic ceramic membrane.

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