Method for recovering sodium nitrate from waste nitric acid

A technology for waste nitric acid and sodium nitrate, applied in the field of recycling sodium nitrate, can solve the problems of containing large impurities, failing to achieve good industrial value, low concentration of sodium nitrate, etc., and achieving the effect of saving processing costs

Inactive Publication Date: 2019-12-13
安庆五宁精细化工有限责任公司
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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the present invention provides a method for recovering sodium nitrate from waste nitric acid, which solves the problem that most of the existing waste nitric acid treatment methods are directly neutralized by soda ash, and the sodium nitrate produced is not only low in concentration , and it contains a large amount of impurities, which cannot achieve good industrial value

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  • Method for recovering sodium nitrate from waste nitric acid

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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] see figure 1 , the embodiment of the present invention provides a technical solution: a method for recovering sodium nitrate from waste nitric acid, specifically comprising the following steps:

[0029] S1. Pretreatment of waste nitric acid: cool down the collected waste nitric acid until it reaches 22°C-26°C, and then press filter the waste nitric acid through a filter press to separate out the solid organic matter and separate it through solid-liquid ...

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Abstract

The invention discloses a method for recovering sodium nitrate from waste nitric acid, and relates to the technical field of waste nitric acid treatment. The method comprises the following steps: S1,preprocessing the waste nitric acid: cooling the collected waste nitric acid to 22-26 DEG C, carrying out filter pressing on the waste nitric acid through a filter press to separate out solid organicmatters in the waste nitric acid, carrying out solid-liquid separation to obtain liquid-phase waste nitric acid water and solid-phase organic matter impurities, and recycling the organic matter impurities. The invention discloses a method for recovering sodium nitrate from waste nitric acid. The filter pressing, solid-liquid separation, standing and filtering operations of the collected waste nitric acid can effectively remove the organic matter impurities, then high-concentration sodium bicarbonate obtained after pulping and washing is mixed and reacted with the waste nitric acid solution, and substances generated in the reaction are few, only are carbon dioxide and water, and are easy to treat, so the utilization rate of the waste nitric acid reaches the maximum; and the price of the sodium bicarbonate is lower than that of sodium carbonate and other substances, so the recovery cost of the waste nitric acid is reduced.

Description

technical field [0001] The invention relates to the technical field of waste nitric acid treatment, in particular to a method for recovering sodium nitrate from waste nitric acid. Background technique [0002] Sodium nitrate is a kind of inorganic salt, the chemical formula is NaNO3, white solid powder, also known as Chilean saltpeter or Peruvian saltpeter (less common), the largest sodium nitrate mine in the world is located in the Atacama Desert of Chile, and can be synthesized by the following chemical formula: NaOH(aq)+HNO3(aq)→NaNO3(aq)+H2O(l) Sodium nitrate is heated to 380°C and decomposed to produce sodium nitrite and oxygen. Sodium nitrate is oxidizing and can react with lead to produce sodium nitrite and Lead oxide, also oxidize hydroiodic acid into iodine element at room temperature and form nitric oxide: After introducing hydrogen ions into sodium nitrate solution, it will show the characteristics of nitric acid: sodium nitrate is one of the components of picklin...

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Application Information

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IPC IPC(8): C01D9/04
CPCC01D9/04
Inventor 杨来文杨基林杨文清杨红志
Owner 安庆五宁精细化工有限责任公司
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