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Method for recovering radioactive elements from zirconium industrial waste residues

A technology for radioactive elements and industrial waste residues, which is applied in the field of recovery of thorium and uranium from zirconium industrial waste residues, can solve the problems of environmental pollution, waste residues not properly handled, environmental protection and radiation protection measures, etc. The effect of easily controlled conditions

Inactive Publication Date: 2019-10-25
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the development and utilization of zirconium, a small part of thorium and uranium enters the waste water during each production process, and most of them are enriched in various waste residues, and a large amount of waste residues are not properly treated, resulting in a much higher radionuclide content than the local The background level of natural radioactivity; coupled with the imperfect environmental protection and radiation protection measures of most enterprises, it has caused different degrees of radioactive pollution to the surrounding environment

Method used

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  • Method for recovering radioactive elements from zirconium industrial waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 1. Roasting: Weigh 100g of zirconium industrial waste slag and place it in a corundum crucible. After testing, the content of Th in the zirconium industrial waste slag is 3.4wt%, and U is 0.045wt%. Sodium oxide 150g, mixing, roasting, control roasting temperature is 300 degree, roasting time 0.5 hour.

[0076] 2. Water leaching to remove impurities: put the roasting waste crucible into 400mL pre-boiled hot water for leaching, then suction filter, wash the filter cake with hot water once to separate aluminum and silicon. The alkaline filtrate is used to neutralize the subsequent raffinate.

[0077] 3. Acid dissolution: add an appropriate amount of concentrated nitric acid to the washed filter cake, and heat until just dissolved, and control the acidity of the feed solution to 0.1mol / L.

[0078] 4. Pickling balance: The volume ratio of the organic phase to the nitric acid solution with an acidity of 1mol / L is O:A=2:1, and the extraction balance is carried out once. After...

Embodiment 2

[0087]1. Roasting: Weigh 100g of zirconium industrial waste and place it in a corundum crucible. After testing, the content of Th in the zirconium industrial waste is 3.4wt%, and U is 0.045wt%. Add hydrogen into the crucible according to the solid-alkali ratio of 1:3 Sodium oxide 300g, mixing, roasting, control roasting temperature is 700 degree, roasting time 2 hours.

[0088] 2. Water leaching to remove impurities: put the roasting waste crucible into 400mL pre-boiled hot water for leaching, then suction filter, wash the filter cake with hot water once to separate aluminum and silicon. The basic filtrate can be used to neutralize the subsequent raffinate.

[0089] 3. Acid dissolution: add an appropriate amount of concentrated nitric acid to the washed filter cake, and heat until just dissolved, and control the acidity of the feed solution to 6mol / L.

[0090] 4. Pickling balance: The volume ratio of the organic phase to the nitric acid solution with an acidity of 3mol / L is O...

Embodiment 3

[0098] 1. Roasting: Weigh 100g of zirconium industrial waste and place it in a corundum crucible. After testing, the content of Th in the zirconium industrial waste is 3.4wt%, and U is 0.045wt%. Add hydrogen into the crucible according to the solid-alkali ratio of 1:2 Sodium oxide 200g, mixing, roasting, control roasting temperature is 450 degree, roasting time 1 hour.

[0099] 2. Water leaching to remove impurities: put the roasting waste crucible into 500mL pre-boiled hot water for leaching, then suction filter, wash the filter cake with hot water once to separate aluminum and silicon. The alkaline filtrate is used to neutralize the subsequent raffinate.

[0100] 3. Acid dissolution: add an appropriate amount of concentrated nitric acid to the washed filter cake, and heat until just dissolved, and control the acidity of the feed solution to 2.5mol / L.

[0101] 4. Pickling balance: The volume ratio of the organic phase to the nitric acid solution with an acidity of 2mol / L is ...

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Abstract

The invention relates to a method for recovering radioactive elements from zirconium industrial waste residues. The method comprises the following steps that the zirconium industrial waste residues are roasted with alkali to obtain roasted waste residues; the zirconium industrial waste residues contain thorium elements and uranium elements; the roasted waste residues are leached, filtered and washed with water to obtain filter residues; the filter residues are dissolved with concentrated nitric acid to obtain feed liquid; a salting-out agent and an extracting agent are added into the feed liquid for extraction to obtain a raffinate I and an organic phase I; the extracting agent contains tri-n-octylamine and an organic solvent, the organic solvent is selected from at least one of ethyl acetate, acetone, n-octanol and cyclohexane, the acidity of the extracting agent is 1mol / L-3mol / L, and the volume concentration of the tri-n-octylamine in the extracting agent is 5%-30%; the organic phaseI is washed with a saturated ammonium nitrate solution to obtain an organic phase II; and the organic phase II is subjected to first-time reverse extraction with 2.4 mol / L to 9.6 mol / L hydrochloric acid solution to obtain a thorium-enriched solution. The conditions of the method are easy to control, and the recovery rate of radioactive elements is high.

Description

technical field [0001] The invention relates to the technical field of nonferrous metals, in particular to a method for recovering thorium and uranium from zirconium industrial waste residue. Background technique [0002] Zirconium ore is one of the associated radioactive minerals. It usually coexists with natural radioactive elements such as thorium and uranium, and has a high concentration of radionuclides. During the development and utilization of zirconium, a small part of thorium and uranium enters the waste water during each production process, and most of them are enriched in various waste residues, and a large amount of waste residues are not properly treated, resulting in a much higher radionuclide content than the local The background level of natural radioactivity; coupled with the imperfect environmental protection and radiation protection measures of most enterprises, it has caused radioactive pollution to the surrounding environment to varying degrees. my coun...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B1/02C22B7/00
CPCC22B7/006C22B60/0208C22B60/026C22B60/0291Y02P10/20
Inventor 刘荣丽王志坚樊玉川王贵超
Owner HUNAN RARE EARTH METAL MATERIAL RES INST