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Separation process of acid and salt in waste acid containing salt

A technology of salt separation and acid in acid, applied in water/sewage multi-stage treatment, filtration treatment, special treatment targets, etc., can solve the problems of incomplete resin saturation, small treatment capacity, and water swelling.

Active Publication Date: 2020-10-09
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution still has problems such as incomplete saturation of the resin per cycle, small processing capacity, complicated control, and water expansion.

Method used

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  • Separation process of acid and salt in waste acid containing salt
  • Separation process of acid and salt in waste acid containing salt
  • Separation process of acid and salt in waste acid containing salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A kind of process of separating acid and salt in salt-containing waste acid of the present invention, this salt-containing waste acid adopts the waste electrolytic solution decoppered liquid of a certain copper smelter, contains sulfuric acid 245g / L, contains copper 14.7g / L, such as figure 1 Shown, technique of the present invention comprises the following steps:

[0055] (1) Before the first use, wash and elute the acid adsorption resin column with water. After finely filtering the salt-containing waste acid (copper-removed liquid) with a 1μm filter membrane, acid adsorption is carried out through an acid adsorption resin column filled with a strong basic anion exchange resin after washing with water. The acid adsorption resin column is equipped with an inner diameter Acid-absorbing resin of 5.5 cm x height 100 cm. The first cycle of adsorption is to pump the decopper liquid after precision filtration into the acid adsorption resin column from the bottom, and collect...

Embodiment 2

[0062] A process for separating acid and salt in salt-containing waste acid of the present invention uses the same salt-containing waste acid solution as in Example 1, the process is basically the same as in Example 1, the only difference is: only for the acid adsorption process The volume of the solution collected by adsorption and elution is changed. During the adsorption process, 1.8L of residual eluent water, 0.7L of deacidified salt solution and 0.7L of waste acid return solution are collected from the upper end in sequence. During the elution process, Collect 1.8L of residual waste acid solution, 0.7L of desalted acid solution and 0.7L of eluate return solution sequentially from the lower end.

[0063] Repeat the second cycle 3 times as well. Finally, the obtained average results are shown in Table 2 below.

[0064] Table 2 Concentration and separation rate of deacidified saline solution and desalted acid solution

[0065]

Embodiment 3

[0067] A process for separating acid and salt in salt-containing waste acid of the present invention uses the same salt-containing waste acid solution as in Example 1, the process is basically the same as in Example 1, the only difference is: only for the acid adsorption process The volume of the solution collected by adsorption and elution is changed. During the adsorption process, 1.8L of residual eluent water, 0.8L of deacidified salt solution and 0.6L of waste acid return solution are collected sequentially from the upper end. During the elution process, Collect 1.8L of residual waste acid solution, 0.7L of desalted acid solution and 0.7L of eluate return solution sequentially from the lower end.

[0068] Repeat the second cycle 3 times as well. Finally, the obtained average results are shown in Table 3 below.

[0069] Table 3 Concentration and separation ratio of deacidified saline solution and desalted acid solution

[0070]

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Abstract

The invention discloses a process for separating acid and salt in salt-containing waste acid. The process comprises that the salt-containing waste acid is subjected to multi-cycle adsorption-elution treatment through an acid adsorption resin column, and the waste acid obtained in the previous cycle is absorbed The return solution, residual waste acid solution, and salt-containing waste acid stock solution are successively acid-adsorbed through the acid adsorption resin from bottom to top, and the residual eluate, deacidification salt-containing solution and waste acid return solution are collected successively, and the process is stopped after reaching the volume requirement. In the first cycle, all salt-containing waste acid is fed in. When elution, the eluate obtained in the previous cycle is returned to the liquid, the residual eluate, and the eluate are eluted successively through the acid adsorption resin from top to bottom, and the residual water is collected successively. Waste acid liquid, desalted acid-containing liquid, and eluate water return liquid, stop water intake after reaching the volume requirement, and all the eluent water is fed in the first cycle, and repeat until the salt-containing waste acid is processed. The process of the invention can be used for the separation of various acids and cations, has good separation effect, is not limited by the height of the resin column, does not produce volume expansion, and has wide applicability.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and reuse, and relates to a process for separating acid and salt in waste acid containing salt, in particular to a process for separating acid and metal salt in waste acid containing high-concentration metal ions. Background technique [0002] In metallurgy, chemical industry, surface treatment and other fields, there are a large number of high-concentration waste acids containing high-concentration impurity metal ions. Such as copper electrolyte in the metallurgical industry, zinc electrolysis waste liquid, leachate in the process of anode slime treatment, etc. Because the impurity metal ions in the solution are too high to be reused, the common treatment methods include neutralization precipitation method, concentrated crystallization method, membrane separation method, etc. Among them, the neutralization precipitation method consumes a lot of auxiliary materials, the amount of was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/04C02F1/26C02F1/28C02F9/00C02F2001/007C02F2001/422C02F2303/14
Inventor 蒋晓云夏栋何劲松易亚男
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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