Acid Recovery and Purification System for Pickling Waste Liquid

A technology of pickling waste liquid and purification system, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., and can solve problems such as large water consumption, poor recovery and treatment effect of waste acid, complex structure, etc. , to achieve the effect of reducing the rework rate, reducing the amount of sludge generated, and improving the pickling speed

Active Publication Date: 2021-12-31
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%), nitric acid (1- 2%), aluminum: ≥75mg / L, chromium: ≥5mg / L, and nickel ≥6mg / L. The waste acid to be recovered in the system of the present invention is mainly phosphoric acid (weak acid). The strength of acidity is directly proportional to the relationship. Strong acid ions have higher electronegativity and are more likely to be adsorbed by resin, while weak acid ions have lower electronegativity and are less likely to be adsorbed by resin;

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

[0064] Among them, the waste acid settling device a is used to p...

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 Example 1 is that a detachable basket a-1 is arranged in the waste acid settling device a, and the bottom surface of the basket a-1 There is a precipitation adsorption part a-2 with a multi-porous structure, and the precipitation adsorption part a-2 is composed of several precipitation adsorption plates a-2.1 with pores.

[0074] In actual use, the interior of the precipitation adsorption part a-2 formed by stacking several pieces of the precipitation adsorption plates a-2.1 is composed of a staggered pore structure, which makes the aluminum hydroxide, nickel hydroxide and chromium hydroxide mainly The sediment is easily adsorbed in the pores. At the same time, the staggered pore structure supports each other, making it difficult for the sediment to desorb from the precipitation adsorption part a-2. When the sediment is ads...

Embodiment 3

[0076] Example 3: Reference figure 1 , Figure 7 , Figure 8 with Figure 9 , an acid recovery and purification system for pickling waste liquid, the difference from Example 1 is that several speed-increasing tubes c-1 are arranged at the feed liquid inlet of the ion exchange resin recovery device c, and the Speed-up tube c-1 is composed of gathering part c-1.1 and speed-up port c-1.2 in sequence according to the flow direction of feed liquid. Small, the speed-increasing port c-1.2 is internally connected to the ion exchange resin recovery device c;

[0077] Several booster tubes c-2 are arranged at the feed liquid outlet of the ion exchange resin recovery device c, and the booster tubes c-2 are sequentially connected by the diffusion part c-2.1 and the booster port c according to the flow direction of the feed liquid -2.2, the diffusion part c-2.1 is a section of pipe body, the inner diameter of which gradually increases according to the flow direction of the feed liquid...

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Abstract

The invention relates to an acid recovery and purification system for pickling waste liquid, which belongs to the technical field of metal finishing waste water reuse. It includes waste acid sedimentation device, filtration device and ion exchange resin recovery device in sequence. It also includes a first storage tank arranged between the waste acid settling device and the filtering device, and a second storage tank arranged between the filtering device and the ion exchange resin recovery device. The purification system is used for the recovery and purification of pickling waste liquid in the metal finishing industry, and has the advantages of high purity of cleaning acid, efficient recovery, low energy consumption and less workload.

Description

technical field [0001] The invention belongs to the technical field of metal finishing waste water reuse, and in particular relates to an acid recovery and purification system for pickling waste liquid. Background technique [0002] In the metal finishing industry, strong inorganic acids (sulfuric acid, nitric acid, hydrochloric acid, etc.) are commonly used to remove oxides on the metal surface to reduce its impact on subsequent production operations. To a large extent, these oxide skins are acid-dissolved, and as the concentration of metal dissolved in the acid solution increases, the concentration of free acid decreases accordingly. While new acid can be added to the acid solution to compensate for this shortcoming, oxide removal (pickling power) generally decreases as the metal concentration increases. When the scale can no longer be adequately removed, the acid must be discarded and replaced with new acid. [0003] This method of operation reduces production efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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