Steel pickling and water recycling method

A technology of steel pickling and water circulation, applied in the direction of metal material coating process, etc., to reduce acid mist, improve production efficiency, and avoid ash hanging.

Inactive Publication Date: 2019-05-10
南京馥安投资管理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It is difficult to systematically solve problems in terms of production efficiency, substrate adaptability, investment, operating costs, and environmental protection in the existing steel pickling. The existing pickling method can only solve a certain aspect of the problem, and cannot reduce Acid mist is produced in the pickling process; low cost realizes the recycling of rinse water after pickling; realizes the recovery and recycling of waste acid

Method used

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  • Steel pickling and water recycling method

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Effect test

Embodiment 1

[0055] Prepare a pickling solution with 35% sulfuric acid, 8% accelerator, and 0.5% corrosion inhibitor. Air is introduced into the pickling solution and the temperature of the pickling solution is controlled to 60°C. Pickling the 304 stainless steel material with a black surface, after 35 minutes of pickling, the surface of the stainless steel reveals a silvery white matrix. Pickling the 316L stainless steel material with black surface, after pickling for 50 minutes, the surface of the stainless steel reveals a silvery white matrix.

Embodiment 2

[0057] Prepare a pickling solution with 28% sulfuric acid, 5% accelerator, and 1% corrosion inhibitor. Air is introduced into the pickling solution and the temperature of the pickling solution is heated to 40°C. Carry out pickling to the carbon steel with black surface, 5 minutes steel surface reveals silver-white matrix.

Embodiment 3

[0059] An anchor chain factory uses a large number of carbon steel wires with a diameter of 6-12mm. Before processing the anchor chain, it is pickled and derusted, and the hydrochloric acid pickling process is used. Because the rinsing water contains hydrochloric acid, after neutralization with lime, a large amount of salty wastewater containing calcium chloride will be produced, making it difficult to achieve zero discharge.

[0060] Empty all the hydrochloric acid in the pickling pool. The size of the acid pool is 3 meters long, 2.5 wide, and 2.5 deep, with an effective volume of 12 cubic meters. Prepare a pickling solution in the acid pool with 25% sulfuric acid, 3% accelerator, and 0.5% corrosion inhibitor, heat and control the temperature of the pickling solution to 40°C, use an acid-resistant pump to mix ozone with the pickling solution through a Venturi mixer, The ozone feed rate is 30g / hour. Each batch of about 1 ton round steel wire rods is derusted in the pickling t...

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Abstract

The invention discloses the field of carbon steel surface pickling and stainless steel pickling passivation, and provides a steel pickling and water recycling method. The method solves the problems that in the production process, a large amount of acid mist is generated, the workpiece rising water treatment difficulty is large, during achieving, water recycling investment and running cost are high, and waste acid recycling is difficult. The steel pickling and water recycling method can be used for acid pickling of carbon steel and also can be used for stainless steel pickling passivation, waste acid recycling is achieved whole rinsing water is circularly used with low cost, and on the basis of ensuring production efficiency and product quality, the environment risk is greatly reduced.

Description

technical field [0001] The invention belongs to the fields of environmental protection and metal processing, and in particular relates to water recycling and acid recovery methods for steel pickling. Background technique [0002] In iron and steel production enterprises and enterprises that use iron and steel to process products, it is usually necessary to pickle and derust the iron and steel surface in order to carry out subsequent surface treatments such as passivation, phosphating, and electroplating. Generally, strong acid solutions such as hydrochloric acid, sulfuric acid, nitric acid, and hydrofluoric acid are used to remove the oxide layer on the steel surface, especially hydrochloric acid or sulfuric acid is more common. [0003] Using hydrochloric acid to clean ordinary carbon steel has high efficiency and no dust on the surface. Generally, it is not necessary to heat the acid, but a large amount of acid mist will be generated during the production process. The acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08C23C22/50C23C22/34
Inventor 吴浩
Owner 南京馥安投资管理有限公司
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