Method for recycling and purifying scandium oxide powder from waste acid in zirconium salt production

A technology for producing zirconium salt and scandium oxide, which is applied in the fields of hydrometallurgy and the treatment and comprehensive utilization of zircon sand waste acid, can solve the problems of difficulty in similarity separation, affecting the extraction capacity and extraction rate of organic relative scandium, and achieves a reduction in processing effect

Active Publication Date: 2014-04-02
江西赛瓷材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In the recovery and extraction process of scandium oxide, the separation and removal of iron, zirconium and other rare earth elements has become the main technical difficulty; the existence of iron and zirconium has ser...

Method used

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  • Method for recycling and purifying scandium oxide powder from waste acid in zirconium salt production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The recovery and purification of scandium oxide from the waste acid solution of producing zirconium salt is carried out according to the following steps:

[0050] The steps of raw material preparation and zirconium precipitation agent precipitation zirconium: first discharge 2000L waste acid solution from the discharge port into an 800-mesh filter bag for filtration, the filtrate flows into the flow tank, and inject the filtered waste acid solution into the sedimentation tank with an acid-resistant pump. After the waste acid in the precipitation tank reaches a certain volume, zirconium precipitation begins; while stirring, a certain amount of ammonium phosphate, a zirconium precipitation agent, is slowly and evenly added to the precipitation tank, and the stirring frequency is gradually increased as the amount of white precipitate increases until the material Stop stirring when the liquid is white and viscous and the color is stable. And use 400-mesh filter bag to filte...

Embodiment 2

[0061] Different from Example 1, the steps of raw material preparation and zirconium precipitation agent precipitation zirconium.

[0062] Filter 1000L of waste acid with an 800-mesh filter bag, the filtrate flows into the launder, and inject the filtered waste acid into the sedimentation tank with an acid-resistant pump, and start to precipitate zirconium after the waste acid in the sedimentation tank reaches a certain volume; A certain amount of zirconium-precipitating phosphoric acid (directly use industrial-grade phosphoric acid, the dosage is 60L, about 10% in excess) is slowly and evenly added to the sedimentation tank, and the stirring frequency is gradually increased with the increase of the amount of white sediment until the feed liquid is white and viscous. Stop stirring when it is thick and the color is stable. And use 400-mesh filter bag to filter, the filter cake is collected separately for further processing or used directly as crude zirconium, and the filtrate i...

Embodiment 3

[0066] Different from Examples 1 and 2, the step of extracting and removing iron with N235 is adopted.

[0067] Filter 1000L of waste acid with an 800-mesh filter bag, the filtrate flows into the launder, and inject the filtered waste acid into the sedimentation tank with an acid-resistant pump, and start to precipitate zirconium after the waste acid in the sedimentation tank reaches a certain volume; A certain amount of zirconium-precipitating phosphoric acid (directly use industrial-grade phosphoric acid, the dosage is 60L, about 10% in excess) is slowly and evenly added to the sedimentation tank, and the stirring frequency is gradually increased with the increase of the amount of white sediment until the feed liquid is white and viscous. Stop stirring when it is thick and the color is stable. A 400-mesh filter bag is used to filter, the filter cake is collected separately for further processing, and the filtrate is collected into the launder.

[0068] Take about 10mL of th...

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Abstract

The invention discloses a method for recycling and purifying scandium oxide powder from waste acid in zirconium salt production. The method comprises the following steps: (S1) performing precipitation separation to remove zirconium from the waste acid liquid in zirconium salt production by use of a zirconium precipitation agent; (S2) performing extraction separation to remove iron from the waste acid after zirconium removal by use of organic-phase trioctyl tertiary amine N235; (S3) extracting and enriching scandium from the waste acid liquid treated by the step (S2) by use of organic-phase mono(2-ethylhexyl) 2-ethylhexyl phosphonate P507; (S4) extracting and purifying scandium from the back extraction liquid of the step (S3) by use of organic-phase di(methylheptyl) methyl phosphonate P350; (S5) precipitating and refining scandium oxide of the back extraction liquid in the step (S4) directly by use of oxalic acid. According to the method disclosed by the invention, scandium is recycled from waste acid and is enriched and further purified and refined to obtain high-purity scandium oxide powder; the method is beneficial to the environment-friendly discharge control and comprehensive utilization of waste acid, and reduces the environmental protection cost of waste acid treatment and up-to-standard discharge of an enterprise; more importantly, the method is used for recycling and preparing expensive high-purity scandium oxide powder.

Description

technical field [0001] The invention belongs to the field of treatment and comprehensive utilization of hydrometallurgy and zircon sand waste acid. Background technique [0002] Millions of cubic meters of waste acid solutions are discharged every year in our country. In addition to a considerable amount of residual acid, the waste acid solution is also rich in many kinds of metal salts. If these waste acid solutions are not treated Discharge into the environment will not only acidify the water body or soil, cause harm to the ecological environment, but also waste a lot of resources. At present, the treatment methods adopted at home and abroad can be roughly divided into three categories: recycling, comprehensive utilization and neutralization treatment. [0003] Although most of them use PH=7 (ie neutral) as the waste acid discharge standard. However, it has to be noticed that even after acid-base neutralization, the industrial waste acid that meets the national and regio...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B7/00
CPCY02P10/20
Inventor 刘琪刘辉刘小海黄余智周萍萍
Owner 江西赛瓷材料有限公司
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