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Purification device for waste alkali liquor in alkali washing and degreasing process of strip steel

A purification device and waste lye technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, special treatment targets, etc., can solve the problem of increasing the cost of environmental protection treatment of enterprises, reducing the service life of lye, and affecting the cleaning efficiency of lye And other problems, to achieve better filtering effect, reduce cleaning frequency, economical and practical effect

Active Publication Date: 2021-09-03
CHANGZHOU VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These sediments and pollutants remaining in the lye may not only stick to the surface of the strip with the lye, so that the strip needs to be cleaned again, but also cause a significant reduction in the service life of the lye, seriously affecting the life of the lye. Cleaning efficiency is not conducive to the production and processing of strip steel; in addition, a large amount of waste lye is produced after the strip steel is washed and degreased by alkali, which virtually increases the environmental protection treatment cost of the enterprise

Method used

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  • Purification device for waste alkali liquor in alkali washing and degreasing process of strip steel
  • Purification device for waste alkali liquor in alkali washing and degreasing process of strip steel
  • Purification device for waste alkali liquor in alkali washing and degreasing process of strip steel

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Embodiment

[0042] Such as Figure 1-7 As shown, the present invention is a purification device for spent caustic lye in the strip steel alkali washing and degreasing process, comprising a primary filter box 1, a temporary storage tank 2 and a second filter tank 3, and the liquid outlet at the bottom of the primary filter box 1 The mouth is connected with the liquid inlet pipe of the three-way pipe 14, and the three-way pipe 14 also includes a cleaning pipe 141, a first infusion pipe 142, and the end of the first infusion pipe 142 away from the primary filter box 1 is connected to the temporary storage tank 2. The liquid inlet is connected, and the liquid outlet located at the bottom of the temporary storage tank 2 is connected with the liquid inlet at the lower end of the second filter tank 3 through the second infusion tube 21;

[0043] The outer wall of the primary filter box 1 is provided with a control panel 11, the top of the primary filter box 1 is provided with a liquid inlet 12, ...

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Abstract

The invention discloses a purification device for waste alkali liquor in alkali washing and degreasing process of strip steel. The device is characterized in that the waste alkali liquor generated in the strip steel degreasing process is divided into two stages of filtering operations through the cooperation of a primary filtering box, a temporary storage tank and a secondary filtering tank, wherein the primary filter tank can effectively remove metal residues with larger volume in the waste alkali liquor (coarse filtration), and the secondary filter tank can effectively remove metal residues with smaller volume in the alkali liquor (fine filtration), so that the filtering treatment operation of the metal residues in the waste alkali liquor is carried out step by step, and the filtering efficiency of the metal residues in the waste alkali liquor is obviously improved; the cleaning period of the purification device is prolonged to a certain extent, and staged cleaning of the primary filter tank and the secondary filter tank can be realized without shutdown, so that the purification treatment efficiency of the waste alkali liquor is further ensured, the equipment investment cost of an enterprise and the total amount of purchased alkali liquor are reduced, and the economic practicability is high.

Description

technical field [0001] The invention relates to the technical field of purification of strip steel alkali washing liquid, in particular to a purification device for waste alkali liquid in the process of strip steel alkali washing and degreasing. Background technique [0002] After the hot-rolled steel plate is pickled and cold-rolled, it is made into a cold-rolled steel strip with a thickness of about 0.2-2.0 mm. During the cold-rolling process, it is necessary to spray rolling oil (emulsion) on the surface of the steel plate to lubricate and cool, and to achieve short-term anti-rust. Before the subsequent heat treatment (annealing) of the cold-rolled strip, the grease and iron powder remaining on the surface of the strip must be cleaned with a degreasing agent. In this way, the cold-rolled steel sheet must be treated with alkali washing and degreasing before annealing, and generally an alkaline degreasing agent is used for cleaning and degreasing. [0003] Alkali cleaning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12
CPCC02F1/001C02F1/484C02F2303/16C02F2303/14
Inventor 孙致平张翠英孙德松
Owner CHANGZHOU VOCATIONAL INST OF ENG
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