A method for separating iron and zinc in iron-containing waste acid

A separation method and acidity technology, which is applied in the field of separation of iron and zinc in iron-containing waste acid, can solve the problems of low recovery efficiency and complicated separation and recovery process, and achieve the effects of long cycle, simple process, and convenient resin elution and regeneration

Active Publication Date: 2021-02-09
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome the defects and deficiencies of the existing complex separation and recovery process of zinc-containing iron waste acid, regeneration pollution, and low recovery efficiency, and provide a method for separating iron and zinc in iron-containing waste acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for separating iron and zinc in iron-containing waste acid, comprising the steps of:

[0043] S1. Pretreatment: Take 1000mL of iron-containing waste acid to remove suspended solids and impurities in the iron-containing waste acid;

[0044] S2. Resin activation: wash and activate 1# resin and 2# resin;

[0045] S3. Adsorption of zinc: 1# resin and 2# resin columns are connected in series, and the iron-containing waste acid pretreated in S1 is sand-filtered and then pumped into the series-connected 1# resin column and 2# resin with a peristaltic pump at a rate of 2BV / h column, zinc ions are adsorbed by the resin, and the ferrous acid solution is collected at the outlet of the resin column;

[0046] S4. Analysis: Use 100mL of clear water to elute the zinc ions adsorbed by the saturated 1# resin column and 2# resin column with running water at a rate of 2BV / h to obtain a low-acidity zinc chloride solution.

[0047] The cross-linking degree of 1# resin column is 6%,...

Embodiment 2

[0054] A method for separating iron and zinc in iron-containing waste acid, comprising the steps of:

[0055] S1. Pretreatment: Take 600mL of iron-containing waste acid to remove suspended solids and impurities in the iron-containing waste acid;

[0056] S2. Resin activation: wash and activate 1# resin and 2# resin;

[0057] S3. Adsorption of zinc: 1# resin and 2# resin columns are connected in series, and the iron-containing waste acid pretreated in S1 is sand-filtered and then pumped into the series-connected 1# resin column and 2# at a rate of 1.5BV / h by a peristaltic pump Resin column, zinc ions are adsorbed by the resin, and ferrous acid solution is collected at the outlet of the resin column;

[0058] S4. Analysis: Use 150mL of clear water to elute the zinc ions adsorbed by the saturated 1# resin column and 2# resin column with flowing water at a rate of 2BV / h to obtain a low-acidity zinc chloride solution.

[0059] The cross-linking degree of 1# resin column is 5%, an...

Embodiment 3

[0066] A method for separating iron and zinc in iron-containing waste acid, comprising the steps of:

[0067] S1. Pretreatment: Take 200mL of iron-containing waste acid to remove suspended solids and impurities in the iron-containing waste acid;

[0068] S2. Resin activation: wash and activate 1# resin and 2# resin;

[0069] S3. Adsorption of zinc: 1# resin and 2# resin columns are connected in series, and the iron-containing waste acid pretreated in S1 is sand-filtered and then pumped into the series-connected 1# resin column and 2# resin with a peristaltic pump at a rate of 1BV / h column, zinc ions are adsorbed by the resin, and the ferrous acid solution is collected at the outlet of the resin column;

[0070] S4. Analysis: Use 150mL of clear water to elute the zinc ions adsorbed by the saturated 1# resin column and 2# resin column with flowing water at a rate of 2BV / h to obtain a low-acidity zinc chloride solution.

[0071] The cross-linking degree of 1# resin column is 5%...

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Abstract

The invention discloses a method for separating iron and zinc in iron-containing waste acid. The method comprises the following steps: S1, pretreating to remove suspended matters and impurities in theiron-containing waste acid; S2, carrying out water washing activation treatment on a 1 # resin and a 2 # resin; S3, carrying out column filing of the 1 # resin column and the 2 # resin column and connection in series, enabling the iron-containing waste acid pretreated in the step S1 sequentially flowing through a 1 # resin column and a 2 # resin column, so that zinc ions are adsorbed by resin, and a ferrous acid solution is collected at a liquid outlet position of the resin columns; and S4, eluting the zinc ions adsorbed by the 1 # resin column and the 2 # resin column with running water to obtain a low-acidity zinc chloride solution. Zinc ions in the waste acid are adsorbed by the activated amphoteric resins; the adsorption columns are washed with water to obtain the low-acidity zinc chloride solution through recovery; meanwhile, a solution obtained after adsorption is a recyclable ferrous acid solution, and can be used for preparing a water purifying agent after being oxidized; thetechnological process is simple, the resins are convenient to elute and regenerate, the usable period is long, no secondary is generated in the process, and separation and resource utilization of ironand zinc elements in the iron-containing waste acid are realized to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of waste acid treatment, in particular to a method for separating iron and zinc in iron-containing waste acid. Background technique [0002] At present, the waste acid containing zinc and iron mainly comes from galvanizing plants. Before galvanizing or spraying, the rust and oxide film on the steel surface need to be pickled, and unqualified galvanized steel needs to be backwashed with hydrochloric acid. The galvanized layer on the surface is dezincified. When the hydrochloric acid content of the two is reduced to a certain concentration, it can no longer be used and becomes a waste liquid. This type of waste liquid generally contains high-concentration hydrochloric acid, ferrous chloride and zinc chloride. Therefore, It has good utilization value and application prospect. However, due to the difficulty in the separation process of iron and zinc, the recycling and utilization of iron-containing waste acid i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/36B01D15/42C02F1/52
CPCB01D15/364B01D15/424C02F1/5245
Inventor 黄莉君蒋银峰朱松锋陈炎彬居银栋
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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