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Recycling process of waste sulfuric acid from corrosion of electrode foil

A technology for recycling and processing waste sulfuric acid, applied in aluminum sulfate, sulfur trioxide/sulfuric acid, aluminum sulfur compounds, etc., can solve the problems of waste of resources, high cost, affecting the filtration speed, etc., achieving no secondary pollution and a wide range of applications , the effect of high environmental performance

Active Publication Date: 2014-07-23
NANTONG VOCATIONAL COLLEGE +2
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  • Claims
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Problems solved by technology

Although this process can absorb part of sulfuric acid through the resin, the concentration of sulfuric acid after washing with water is less than 20%, which is lower than the concentration of sulfuric acid required by the corrosion process, and the concentration of aluminum ions in it exceeds the standard. Considering the impact of aluminum ion concentration on the corrosion process, part of the recovered acid cannot be reused; on the other hand, the lime precipitation process produces a large amount of gypsum solid waste, which must be sent to the solid waste treatment center for treatment. The cost is high, and it still needs to be discharged every day A lot of waste water, waste of resources
[0003] Patent CN 102079512A discloses the process of recovering sulfuric acid and sulfate from the waste acid of titanium dioxide prepared by the sulfuric acid method. By adopting three times of evaporation and three times of condensation, the heat energy of steam evaporated each time is not utilized, and the energy consumption is large; a membrane filter press is used to Filtration, because the aluminum sulfate colloid has formed a dense filter layer during the press filtration process, which affects the filtration speed, and it is not easy to carry out continuous operation, and no other substances are recovered from the waste materials

Method used

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  • Recycling process of waste sulfuric acid from corrosion of electrode foil
  • Recycling process of waste sulfuric acid from corrosion of electrode foil

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Embodiment Construction

[0022] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the examples and figures. The following examples are only used to explain the present invention, and do not constitute a limitation to the protection scope of the present invention.

[0023] Such as figure 2 Shown: a recovery treatment process of electrode foil corrosion waste sulfuric acid, the specific steps are as follows:

[0024] Step 1. Preheating: the electrode foil corrosion waste sulfuric acid from the waste sulfuric acid storage tank is pumped into the preheater for preheating, and the uncondensed steam generated by the three-effect evaporator and the concentrated high-temperature sulfuric acid are used as the preheating heat source;

[0025] Step 2. Evaporation: The preheated waste sulfuric acid enters the three-effect evaporator to evaporate, and the sulfuric acid content reaches 40%-70% through the control of the acid flo...

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Abstract

The invention discloses a recycling process of waste sulfuric acid from corrosion of an electrode foil, and the specific steps are as follows: preheating, evaporating, cooling, condensing and crystallizing, performing centrifugal separation and drying. According to the recycling process disclosed by the invention, steam-saving three-effect evaporation is adopted for concentrating the waste sulfuric acid, basic conditions for enabling aluminum sulfate in the waste acid to form a colloid are created, and sulfuric acid-containing steam which is evaporated out is condensed and recovered; and the aluminum sulfate in the concentrated sulfuric acid is further crystallized at certain temperature for facilitating centrifugal separation of the concentrated sulfuric acid and an aluminum sulfate polymer, the effective recovery of the sulfuric acid and the aluminum sulfate is realized, the purpose of reducing the emission is achieved, and the cost of a corrosion process of the electrode foil is further effectively reduced, thereby greatly assisting in upgrading of market competitiveness of an electrode foil product.

Description

technical field [0001] The invention relates to a recovery and treatment process for electrode foil corrosion waste sulfuric acid. Background technique [0002] At present, there is a lot of waste acid output in the corrosion hole expansion process of electrode foil production, of which: sulfuric acid is 28%, Al 3+ 0.8%, hydrochloric acid and nitric acid are 1%, density is 1140 kg / m 3 , normal temperature, colorless. The recovery and treatment process of electrode foil corrosion waste sulfuric acid is: waste acid—ion exchange resin—adding lime to adjust pH—precipitationdischarge, such as figure 1 shown. Although this process can absorb part of sulfuric acid through the resin, the concentration of sulfuric acid after washing with water is less than 20%, which is lower than the concentration of sulfuric acid required by the corrosion process, and the concentration of aluminum ions in it exceeds the standard. Considering the impact of aluminum ion concentration on the corr...

Claims

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Application Information

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IPC IPC(8): C01B17/90C01F7/74C23F1/46
Inventor 蔡凤解彦刚李铁军何晓春史桢儒
Owner NANTONG VOCATIONAL COLLEGE
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