Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for decontaminating radioactive materials

A technology of radioactive substances and substances, applied in the fields of radioactive purification, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as the ineffectiveness of dissolving plutonium

Inactive Publication Date: 2004-04-14
BRADTEC
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned in U.S. Patent No. 5,322,644, carbonate solutions have been found to be less effective at dissolving plutonium in the absence of chelating agents

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0048] Magnetic resins with iminodiacetic acid functional groups were prepared according to the method described in European Patent No. 0522856. Treatment with ammonium acetate (0.1M) converted the resin to the ammonium form. Aged plutonium-contaminated soil (6 g) from a US site was mixed with a solution (100 ml) containing 1 M carbonate, pH adjusted to pH9. Hydrogen peroxide (51 µl, 30% solution) and magnetic resin (0.8 dry weight) were added, and the mixture was stirred at a temperature of 50°C for 2 hours. The resin is separated from the soil using magnetic separation and washed with water. The solution is separated from the soil by filtration. The magnetic resin was regenerated by washing with 8M nitric acid. Soils, resin regeneration eluates and lysates were analyzed for plutonium.

[0049] The average results of the three samples showed that 27% of the plutonium originally present in the soil remained on the soil, 68% of the plutonium originally present in the soil w...

example 2

[0051] The magnetic resin with iminodiacetic acid functional group was prepared in the manner of Example 1. The resin is used in the hydrogen form. Aged plutonium-contaminated soil (6 g) obtained from a US site was mixed with a solution containing 1M carbonate, pH adjusted to pH9. Hydrogen peroxide (51 μl, 30% solution) and magnetic resin (0.8 g dry weight) were added, and the mixture was stirred at 50° C. for 2 hours. Soil separates from solution and resin. The same soil was treated with 4 more fresh batches of resin and solution using the same procedure. At the end of five exposures, the average of the two samples showed that the concentration of plutonium in the soil was reduced from 35.8 becquerels per gram (Bq / g) to 3.7 becquerels per gram, that is, >90% of the plutonium has been removed from the soil.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A process for the decontamination of radioactive materials comprises the steps of: i) contacting the material to be decontaminated with a dilute carbonate containing solution in the presence of ion exchange particles which either contain or have a chelating function bound to them; and ii) separating the ion exchange particles from the dilute carbonate containing solution. The radioactive materials which are treated may be natural materials, such as soil, or man-made materials such as concrete or steel, which have been subjected to contamination.

Description

technical field [0001] The present invention relates to a decontamination method for radioactive substances. Background technique [0002] Environmental contamination by radioactive materials is a common problem. Environmental pollution problems can arise due to mining operations, such as the extraction of uranium, or due to the operation of nuclear facilities without adequate environmental controls, or due to the disposal of radioactive waste. In addition, the proliferation of uranium billets used as high-density materials in military and civilian applications may also generate environmental pollution due to wartime or peacetime accidents. [0003] Mining operations have established practical and economical methods of recovering certain radioactive elements from contaminated material. While the purpose of mining is generally the economical recovery of material, secondary waste is given little attention. In terms of environmental purification, the economic goal is to achi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J45/00G21F9/00G21F9/12G21F9/22G21F9/28
CPCG21F9/22G21F9/28G21F9/002G21F9/00
Inventor D·布雷德伯利G·R·艾尔德
Owner BRADTEC