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A method for enriching zirconium and titanium from waste acid discharged from zirconium oxychloride production

A technology of zirconium oxychloride and waste acid, applied in the field of comprehensive utilization of waste acid resources, can solve problems such as difficult direct application of zirconium oxychloride process, and achieve the effect of improving resource utilization

Active Publication Date: 2022-04-05
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reported patents, zirconium and titanium are mainly precipitated by phosphate or phosphoric acid, and the phosphate obtained from zirconium and titanium can only be calcined to obtain pyrophosphate, which is difficult to directly apply to the existing zirconium oxychloride process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the mass ratio of waste acid to tartaric acid as 100:5, add 10% tartaric acid solution into the waste acid, stir for 30 minutes, then add 30% sodium hydroxide solution according to the mass ratio of waste acid to sodium hydroxide as 100:5, and stir Filter after 30 minutes, wash the filter residue once with water, filter again, and dry to obtain zirconium and titanium concentrates, Zr(Hf)O 2 Content 36%, TiO 2 The content is 17.5%, while Fe 2 o 3 、Al 2 o 3 The content is less than 1.5%, Y 2 o 3 The content is less than 1%.

Embodiment 2

[0023] According to the mass ratio of waste acid to glutamic acid 100:10, add 10% glutamic acid solution to the waste acid, let it stand for 1h, then add 10% hydroxide according to the mass ratio of waste acid to potassium hydroxide 100:10 Potassium solution, filtered after standing for 1h, and the filter residue was dried to obtain zirconium and titanium concentrates, Zr(Hf)O in the concentrates 2 Content 20.5%, TiO 2 The content is 13.2%, while Fe 2 o 3 、Al 2 o 3 The content is less than 1%, Y 2 o 3 The content is less than 1.4%.

Embodiment 3

[0025] According to the mass ratio of waste acid to sodium oxalate 100:15, add 20% sodium oxalate solution into the waste acid, let it stand for 2 hours, then add solid sodium carbonate according to the mass ratio of waste acid to sodium carbonate 100:15, let it stand for 2 hours After filtration, the filter residue is dried to obtain zirconium enrichment, in which Zr(Hf)O 2 Content 22.6%, TiO 2 The CaO content is 1.2%, and the CaO content is 12.8%. It can be seen that when sodium oxalate is used as an auxiliary agent, it is easy to enrich calcium into the slag, and this system mainly enriches zirconium, and the enrichment effect on titanium is not significant.

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Abstract

The invention relates to resource comprehensive utilization of waste acid, and specifically discloses a method for enriching zirconium and titanium from waste acid discharged from zirconium oxychloride production. The process of the present invention mainly includes the method of adding organic acid or organic acid salt to waste acid to enrich zirconium and titanium, which can realize the effective separation of zirconium, titanium and other elements such as sodium, iron, aluminum, yttrium and so on in waste acid, and obtain The enriched product can be used as the secondary raw material for extracting zirconium and titanium, which can be directly applied to the existing zirconium oxychloride process, and can also be used for the comprehensive utilization of waste acid resources after solvent extraction to extract scandium. Compared with the reported extraction, phosphate, and phosphoric acid precipitation methods, the present invention has the advantages of simple process and high enrichment rate, and is also conducive to the reduction of subsequent neutralization waste residue.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of waste acid resources. Specifically, the invention relates to a method for enriching zirconium and titanium from waste acid discharged from production of zirconium oxychloride. Background technique [0002] Zirconium oxychloride is an important zirconium chemical product. It is the basic raw material for the production of zirconium oxide, stabilized zirconium, zirconium carbonate, zirconium sulfate and other zirconium products. It can also be used as a raw material for nuclear grade zirconium. It is widely used in ceramics, chemicals, Electronics, industrial catalysts, automobile exhaust purification, military industry, nuclear power plants and nuclear industry and other industries. [0003] At present, zirconium oxychloride is mainly produced by the one-acid-alkali process in China. This process has the advantages of simple process and easy industrialization, but the disadvantage is hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/12C22B34/14
CPCC22B7/006C22B34/14C22B34/124Y02P10/20
Inventor 宋静齐涛董进海曲景奎吴江朱安华崔玉玲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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