A kind of recovery treatment method of galvanized pickling waste hydrochloric acid

A technology for recovery and treatment of waste hydrochloric acid, applied in metallurgical wastewater treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as cross-contamination, increased difficulty of waste acid treatment, increased cost, etc. Environmental protection, easy maintenance and management, and low input cost

Active Publication Date: 2018-04-17
新兴铸管集团邯郸新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When backwashing, it is the same pickling pool as the pickling of general galvanized parts, so the result of backwashing is to cause cross-contamination, and the pickling solution contains ZnCl 2 and ZnO and other compounds, Zn needs to be considered in the post-processing process 2+ treatment method, and Zn 2+ with Fe 2+ The mutual influence of waste acid increases the difficulty and cost of waste acid treatment

Method used

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  • A kind of recovery treatment method of galvanized pickling waste hydrochloric acid
  • A kind of recovery treatment method of galvanized pickling waste hydrochloric acid

Examples

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Embodiment 1

[0049] Required equipment: sedimentation tank, filter press, waste acid storage tank, mother liquor storage tank, sulfuric acid replacement reaction kettle, circulating steam distillation device, cooling kettle, suction filtration device, vacuum negative pressure device.

[0050] Steps:

[0051] 1. Sediment filtration

[0052] Put the galvanized parts that need to be pickled in a special pickling tank and pickle them with hydrochloric acid. There is no backwashing process for galvanized parts in the pickling tank. The pickling solution is used repeatedly until it fails. According to experience, it is generally considered that the pickling solution When the specific gravity reaches 1.2 to 1.4, the pickling solution is considered to be invalid, discarded, and treated as a waste acid solution. It was detected that the density was greater than 1.2g / mL containing hydrochloric acid and FeCl 2 The spent acid solution is recovered separately. The waste acid solution is first introd...

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Abstract

The invention relates to the technical field of waste acid treatment, and specifically discloses a recovery and treatment method for galvanized pickling waste hydrochloric acid. The waste acid solution containing hydrochloric acid and FeCl2 with a density greater than or equal to 1.2 g / mL is sequentially processed through the following steps: precipitation filtration , sulfuric acid replacement, cooling crystallization, suction filtration of crystals, circular distillation, cooling crystallization, suction filtration of crystals, and finally obtain high-purity, high-concentration hydrochloric acid and FeSO4 7H2O crystals. The remaining mother liquor in the treatment process can be recycled through recycling. The invention has low investment, high treatment efficiency, simple process, convenient operation, high recovery rate, environmental protection and no pollution in the treatment process, easy maintenance and management, and good economic benefits.

Description

technical field [0001] The invention relates to the technical field of waste acid treatment. Background technique [0002] The hot-dip galvanizing process is one of the important means to delay the corrosion of steel. Before the steel is galvanized, it is necessary to pre-treat the surface of the steel with hydrochloric acid, that is, the pickling process. The surface of the steel is etched in hydrochloric acid to remove the surface of the steel. Rust and oxide film on. When steel is pickled in hydrochloric acid, two iron salts are produced: one is ferric chloride and the other is ferrous chloride. Pickling parts are generally rarely seriously rusted, so most of them are ferrous chloride. With the increase of iron salt, the concentration of hydrochloric acid in the pickling solution will also lighten, the specific gravity (density) of the pickling solution will increase, and its corrosion efficiency will gradually decrease until it fails. Generally, the specific gravity of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01B7/07C02F103/16
Inventor 张宝生李生
Owner 新兴铸管集团邯郸新材料有限公司
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