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Industrial waste nitric acid comprehensive utilization process

A waste nitric acid, industrial technology, applied in the directions of nitric acid, nitrogen oxides/oxyacids, copper oxide/copper hydroxide, etc., can solve the problems of interfering with resource recovery to be studied, high operating costs, complex processes, etc., to avoid The effect of secondary pollution, easy operation and reducing the amount of alkali

Inactive Publication Date: 2017-03-22
方亚飞 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Physical method: use physical action to separate pollutants, such as evaporative concentration, which is a treatment method for evaporating waste water to concentrate it, and then recycle and reuse it. Evaporation and concentration treatment of waste water is a mature and simple process that does not require Chemical reagents, no secondary pollution, reusable water or valuable heavy metals, have good environmental and economic benefits, but due to high energy consumption, high operating costs, and the problem of impurities interfering with resource recovery to be studied, the application is limited;
[0006] 2. The chemical neutralization method is one of the more traditional methods. Its basic principle is to add alkali to the wastewater and adjust the pH of the wastewater to make it neutral or close to neutral, so as to meet the requirements of efflux, and the metal ions in the solution are converted The metal hydroxide is directly discharged to the outside world, which wastes resources;
This method requires a large amount of sulfuric acid and other chemicals, the process is complicated, and the operating cost is still high

Method used

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  • Industrial waste nitric acid comprehensive utilization process

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Effect test

Embodiment 1

[0030] Treatment of nitric acid-type tin stripping solution. The nitric acid-type tin stripping solution is mainly composed of ferric nitrate and nitric acid. The acid concentration reaches about 20-25%. A large amount of waste liquid will be produced, and the waste tin stripping liquid is one of the largest waste liquids, which contains a large amount of acid, tin, copper, etc.

[0031] Take nitric acid type tin stripping solution 1m 3 , add 100kg of copper-containing waste, keep warm at 70°C, stir and leaching, detect the copper content in the leaching solution, when the mass percentage concentration of copper content in the leaching solution reaches 9%, add copper hydroxide to purify the leaching solution, and adjust the solution. pH value=4, stirred for 0.5h to remove Sn and Fe impurities in the solution; press filter, and the filter residue was sold as a material containing Sn and Fe; the filtrate was concentrated by evaporation, and the evaporated concentrate was placed ...

Embodiment 2

[0033] Treatment of waste nitric acid stripping solution, the waste nitric acid stripping solution is mainly composed of HNO 3 , Cu(NO 3 ) 2 Composition, the concentration of acid reaches about 20%, and Ni ions are precipitated between P=4-5.

[0034] Take waste nitric acid strip solution 1m 3 , add 120kg of copper-containing waste, keep warm at 60-80°C, stir and leaching, detect the copper content in the leaching solution, when the mass percentage concentration of copper content in the leaching solution reaches 8%, add copper hydroxide to purify the leaching solution, adjust The pH value in the solution is 3.5, stir for 0.5h to remove the Fe impurities in the solution; press filter, and the filter residue is sold as Fe-containing material; the filtrate is concentrated by evaporation, and the evaporated concentrate is cooled at 15°C for 2h, crystallization occurs Copper nitrate, while the mother liquor is returned to heating and leaching; the steam generated by evaporation ...

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Abstract

The invention relates to an industrial waste nitric acid comprehensive utilization process. The process comprises the steps of heating and leaching industrial waste nitric acid and copper-containing wastes, clearing impurities, press-filtering, evaporating and concentrating the filtered solution, crystallizing to generate cupric nitrate, conducting pyrogenic decomposition of the cupric nitrate to acquire cupric oxide products for sale, delivering nitrogen dioxide and oxygen generated by the pyrogenic decomposition into a mutil-stage absorption tower for catalyzing, oxidizing and absorption to acquire diluted nitric acid. The process has the advantages of consuming small dose of chemical agents, having no secondary pollution, having recyclable valuable heavy metal, thus bearing good environmental benefit and economic benefit.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a comprehensive utilization process of industrial waste nitric acid. Background technique [0002] Nitric acid is one of the important products of the basic chemical industry. It is widely used in chemical industry, metallurgy, medicine, dyestuff, pesticide and other fields. It is an important chemical raw material. In the steel industry, it is used for pickling and polishing of rare earth processing, in the electronics industry, it is used for tin stripping and cleaning of semiconductors and printed circuit boards, and in the nuclear industry, it is used for the extraction and refining of uranium. Especially in the application of etching and deplating in the electroplating industry, the etching is that in the electroplating process, the metal parts are immersed in the corresponding etching solution, and the etching solution is used to chemically react with the oxidiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/40C01G3/02
CPCC01B21/40C01G3/02
Inventor 方亚飞方婷
Owner 方亚飞