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Acid recovery and purification system for pickling waste liquid

A technology for pickling waste liquid and purification system, which is applied in the fields of metallurgical waste water treatment, chemical instruments and methods, special treatment targets, etc. The upper and lower forces on the membrane and the difference in concentration are different, the water distribution is uniform, and the floor space is small.

Active Publication Date: 2019-11-01
ZHEJIANG DONGYANG ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its purpose is to solve the problems of complex structure, large water consumption and poor recovery and treatment effect of waste acid in the existing waste acid recovery device

Method used

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  • Acid recovery and purification system for pickling waste liquid
  • Acid recovery and purification system for pickling waste liquid
  • Acid recovery and purification system for pickling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Reference figure 1 , An acid recovery and purification system for pickling waste liquid. The system is used to treat acid-containing wastewater in the metal finishing industry. Such wastewater includes phosphoric acid (20-30%), sulfuric acid (5%), and nitric acid (1- 2%), aluminum: ≥75mg / L, chromium: ≥5mg / L, and nickel ≥6mg / L. The waste acid to be recycled in the system of the present invention is mainly phosphoric acid (weak acid). As we all know, the adsorption affinity of acid radical ions is The acidity is proportional to the strength of the acid. Strong acid ions are more electronegative and easier to be adsorbed by the resin, while weak acid ions are less electronegative and less likely to be adsorbed by the resin;

[0063] The pickling waste liquid flows through the waste acid settling device a, the first storage tank d, the filtering device b, the second storage tank e, and the ion exchange resin recovery device c in sequence;

[0064] Among them, the was...

Embodiment 2

[0073] Example 2: Reference figure 1 , Figure 5 with Image 6 , An acid recovery and purification system for pickling waste liquid. The difference from embodiment 1 is that: the waste acid settling device a is provided with a detachable basket a-1, and the bottom surface of the basket a-1 A precipitation adsorption part a-2 with a porous structure is arranged at the location, and the precipitation adsorption part a-2 is composed of a plurality of precipitation adsorption plates a-2.1 with pores.

[0074] In actual use, the inside of the precipitation adsorption part a-2 formed by superimposing several pieces of the precipitation adsorption board a-2.1 is composed of staggered pore structure, and the pore structure is mainly composed of aluminum hydroxide, nickel hydroxide and chromium hydroxide. The sediment is easily adsorbed in the pores. At the same time, the interlaced pore structure supports each other so that the sediment is not easily desorbed from the sediment adsorption...

Embodiment 3

[0076] Example 3: Reference figure 1 , Figure 7 , Figure 8 with Picture 9 , An acid recovery and purification system for pickling waste liquid. The difference from Example 1 is that: the ion exchange resin recovery device c is provided with a plurality of speed increasing tubes c-1 at the inlet of the material liquid. The speed-increasing tube c-1 is composed of a condensing part c-1.1 and a speed-increasing port c-1.2 according to the flow direction of the material and liquid. The condensing part c-1.1 is a section of tube body whose inner diameter is gradually reduced according to the flow direction of the material and liquid. Small, the speed increasing port c-1.2 is in communication with the ion exchange resin recovery device c;

[0077] The material liquid outlet of the ion exchange resin recovery device c is provided with a plurality of pressure-increasing pipes c-2. The pressure-increasing pipe c-2 consists of a diffuser c-2.1 and a pressure-increasing port c in sequenc...

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Abstract

The invention relates to an acid recovery and purification system for a pickling waste liquid, and belongs to the technical field of wastewater reuse of metal finishing. The system sequentially comprises a waste-acid sedimentation device, a filtration device and an ion exchange resin recovery device; the system further comprises a first storage tank arranged between the waste-acid sedimentation device and the filtration device, and a second storage tank arranged between the filtration device and the ion exchange resin recovery device. The purification system provided by the invention is used for recovery and purification of the pickling waste liquid in the metal finishing industry, and has the advantages of high purity of a cleaning acid, high-efficiency recovery, low energy consumption and less workload.

Description

Technical field [0001] The invention belongs to the technical field of waste water reuse in metal finishing, and in particular relates to an acid recovery and purification system for pickling waste liquid. Background technique [0002] In the metal finishing industry, strong mineral acids (sulfuric acid, nitric acid, hydrochloric acid, etc.) are commonly used to remove oxides on the metal surface to reduce their impact on subsequent production operations. To a large extent, these oxide skins are dissolved by acid, and as the concentration of metals dissolved in the acid solution increases, the concentration of free acid decreases accordingly. Although new acid can be added to the acid solution to make up for this shortcoming, when the metal concentration increases, the oxide removal rate (pickling ability) usually decreases. When the oxide scale can no longer be fully removed, the acid must be discarded and replaced with a new one. [0003] This method of operation will reduce pr...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCC02F9/00C02F2103/16C02F2001/007C02F1/001C02F1/42C02F1/44C02F2303/14C02F2303/16C02F2001/422
Inventor 任晓哲秦小伟周江钟卫权
Owner ZHEJIANG DONGYANG ENVIRONMENTAL ENG
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