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Resourceful treatment method for hot galvanizing pickling waste liquid

A technology for pickling waste liquid and treatment methods, which is applied in the preparation of zinc compounds, zinc oxide/zinc hydroxide, iron halide, etc., can solve the problems of low added value of products, large consumption of ammonia water, etc., and achieve easy maintenance and management, The effect of avoiding water pollution and simple operation of impurity removal

Pending Publication Date: 2021-02-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention can realize the resource utilization of waste acid, the added value of the product is low; in addition, the invention patent directly adjusts the pH of the pickling waste liquid by adding ammonia water, and the concentration of HCl in the pickling waste liquid is 10 to 80 g / L, so that the consumption of ammonia water is very huge

Method used

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  • Resourceful treatment method for hot galvanizing pickling waste liquid
  • Resourceful treatment method for hot galvanizing pickling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The content of each chemical component in the hot-dip galvanizing pickling waste solution Zn: 17.6 g / L, Fe 2+ : 141.1 g / L, Fe 3+ : 2.1g / L and HCl: 51.1g / L.

[0050] Processing procedure:

[0051] (1) Add reduced iron powder to the pickling waste liquid according to the weight ratio of reducing agent and pickling waste liquid at 1:50, stir and reduce for 2 hours, and then filter out insoluble matter and unreacted iron powder.

[0052] (2) Prepare 15% extractant, compared with O / A=1:1, extraction time is 10 minutes, countercurrent extraction stage is 3, zinc ion content in raffinate is 9.5ppm, saturated zinc extraction of organic phase The capacity is 11.4g / L.

[0053] (3) The stripping agent used is 0.5M NaOH solution, at the ratio of O / A=1:1.5, the stripping time is 15 minutes, the primary stripping efficiency is 98.6%, and then the stripping solution is filtered.

[0054] (4) Dissolve the filter cake with dilute hydrochloric acid solution obtained by distillation, ...

Embodiment 2

[0056] The content of each chemical component in the hot-dip galvanizing pickling waste solution Zn: 30.2 g / L, Fe 2+ : 148.4 g / L, Fe 3+ : 2.5g / L and HCl=69.4g / L.

[0057] Processing procedure:

[0058] (1) Add reducing agent according to the ratio of reduced iron powder to pickling waste liquid at 1:100, stir and reduce for 2 hours, then filter out insoluble matter and unreacted iron powder.

[0059] (2) Prepare 20% extractant, compared with O / A=1.5:1, extraction time is 10 minutes, countercurrent extraction stage is 4, zinc ion content in raffinate is 8.4ppm, saturated zinc extraction of organic phase The capacity is 15.2g / L.

[0060] (3) The stripping agent used is 0.5M ammonia solution, compared to O / A=1:1, the stripping time is 15 minutes, the primary stripping efficiency is 98.8%, and then the stripping solution is filtered.

[0061] (4) Dissolve the filter cake with the dilute hydrochloric acid solution obtained by distillation, then add ammonium chloride-ammonia wat...

Embodiment 3

[0063] The content of each chemical component in the hot-dip galvanizing pickling waste solution Zn: 25.6 g / L, Fe 2+ : 145.2 g / L, Fe 3+ : 2.5g / L and HCl: 46.2g / L.

[0064] Processing procedure:

[0065] (1) Add reducing agent according to the ratio of reduced iron powder to pickling waste liquid at 1:80, stir and reduce for 1.5 hours, then filter out insoluble matter and unreacted iron powder.

[0066] (2) Prepare 10% extractant, compared to O / A=2:1, countercurrent extraction for 7 minutes, the extraction stage is 5, the zinc ion content in the raffinate is 6.5ppm, the saturated zinc extraction capacity of the organic phase It is 7.4g / L.

[0067] (3) The stripping agent used is 1MNa 2 CO 3 Solution, compared to O / A=1:2, the stripping time is 10 minutes, the primary stripping efficiency is 97.8%, and then the stripping liquid is filtered.

[0068] (4) Dissolve the filter cake with the dilute hydrochloric acid solution obtained by distillation, then add 3% ammonium chlorid...

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Abstract

The invention discloses a resourceful treatment method of hot galvanizing pickling waste liquid, which comprises the following steps: filtering the pickling waste liquid to remove suspended matters and insoluble solids, and adding a reducing agent to reduce Fe < 3 + > in the pickling waste liquid into Fe < 2 + >; carrying out multi-stage countercurrent extraction on the pickling waste liquid through an extraction agent, carrying out reverse extraction on an organic phase through a reverse extraction agent, filtering reverse extraction liquid to obtain a filter cake A, dissolving the filter cake A with diluted hydrochloric acid, and adding a small amount of pickling waste liquid to obtain a solution A; adjusting the pH value of the solution A by using ammonia water and ammonium chloride toremove Fe < 3 + > to obtain a solution B; adding strong alkali into the solution B, and heating and boiling until no ammonia smell exists, so as to obtain a solution C containing white precipitate; and filtering the white precipitate to obtain a filter cake B, and drying the filter cake B to obtain zinc oxide. The recovery treatment method for the hot galvanizing pickling waste liquid is simple, low in energy consumption, safe to operate, low in investment cost, capable of achieving maximum resourceful utilization of the hot galvanizing pickling waste liquid, convenient to implement, easy to maintain and manage and worthy of being further popularized in industrial production.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to a low-consumption and high-efficiency hot-dip galvanizing pickling waste liquid resource treatment method. Background technique [0002] Hot-dip galvanizing is an important means of steel plate anti-corrosion. 70% (more than 7 million tons / year) of the world's annual zinc production is used in the field of hot-dip galvanizing anti-corrosion. When the steel plate is galvanized, it is necessary to carry out pre-washing inspection, degreasing, water washing, pickling and rust removal, water washing, galvanizing treatment, hot-dip galvanizing, post-plating treatment, and classification and identification. Wherein the used processing raw material of the present invention is exactly the pickling waste liquid of pickling derusting link. [0003] In the process of hot-dip galvanizing and pickling, backwashing of galvanized parts is a process of re-pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02C01G49/10C22B19/34C22B7/00
CPCC01G9/02C01G9/003C01G49/10C01G49/0009C22B19/34C22B7/006C01P2006/80Y02P10/20
Inventor 李世伟王永密龙海林尹少华张利波彭金辉朱镕徐彩霞张艺婷
Owner KUNMING UNIV OF SCI & TECH
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