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Process using waste liquid to produce ferrous carbonate and sodium nitrate

A technology of ferrous carbonate and sodium nitrate, which is applied in the preparation of alkali metal nitrate, iron compounds, chemical instruments and methods, etc., can solve the problems such as large output of waste acid and cannot be completely consumed, and achieves low equipment investment, simple steps, high yield effect

Inactive Publication Date: 2019-05-14
罗丽斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the huge amount of waste acid obtained from the production of titanium dioxide by the nitric acid method, the above methods cannot be completely consumed. The

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] Embodiment: produce the technique of ferrous carbonate and sodium nitrate by waste liquid, the method comprises following specific steps:

[0013] Step A: Mix the waste acid obtained by producing titanium dioxide by the nitric acid method with excess ferric hydroxide solution, react nitric acid with ferric hydroxide to generate ferrous nitrate; filter the reaction solution to obtain a filtrate mainly containing ferrous nitrate, containing a small amount of unreacted The filter residue of ferric hydroxide and insoluble impurities, the filter residue is deeply buried or processed by other processes;

[0014] Step B: add excessive sodium carbonate to the filtrate mainly containing ferrous nitrate obtained in step A, react under stirring, generate ferrous carbonate and sodium nitrate, filter the reaction solution, separate ferrous carbonate precipitation and sodium nitrate solution; this step In, a small amount of unreacted sodium carbonate is also in the sodium nitrate sol...

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Abstract

The invention provides a process using waste liquid to produce ferrous carbonate and sodium nitrate. The process includes: subjecting waste acid obtained by titanium dioxide production using a nitricacid method and excessive ferric hydroxide to mixed reaction to generate ferrous nitrate; filtering reaction liquid to obtain filtrate mainly containing ferrous nitrate; adding excessive sodium carbonate into the filtrate mainly containing ferrous nitrate to perform reaction to generate ferrous carbonate and sodium nitrate, and filtering the reaction liquid to separate ferrous carbonate precipitates and the sodium nitrate solution; subjecting the ferrous carbonate precipitates to washing, drying and crushing to obtain the ferrous carbonate product; adding a small amount of nitric acid into thesodium nitrate solution to neutralize ammonium carbonate, feeding into a reduced-pressure distiller to perform reduced-pressure distillation to obtain the oversaturated sodium nitrate solution, and performing cooling crystallization and drying to obtain the sodium nitrate product.

Description

technical field [0001] The invention relates to a process for producing ferrous carbonate and sodium nitrate from waste liquid. Background technique [0002] Titanium dioxide is produced by nitric acid method. The waste acid in the production process mainly contains nitric acid and ferrous nitrate, and also contains a small amount of metatitanic acid and other metal ions. The content of nitric acid is 18-23%, and the content of ferrous nitrate is 80g / L (in terms of anhydrous ferrous nitrate), only a small amount of waste acid can be returned for reuse, and most of the waste cannot be directly utilized. [0003] At present, there are many comprehensive utilization methods for the waste acid obtained from the nitric acid production of titanium dioxide, mainly using the waste acid to react with iron to generate ferrous nitrate, and using ferrous nitrate to produce iron-based pigments such as iron hydroxide black and iron red; or Use ammonia to neutralize waste acid to produce ...

Claims

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Application Information

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IPC IPC(8): C01G49/00C01D9/08
Inventor 罗丽斌
Owner 罗丽斌