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Liquid Waste Solidification

#0376


Research on the Process of Liquid High-Level Waste Solidification in Induction Smelter with Cold Crucible.

Tech Area / Field

  • ENV-RWT/Radioactive Waste Treatment/Environment

Status
8 Project completed

Registration date
24.02.1995

Completion date
04.03.2002

Senior Project Manager
Tocheny L V

Leading Institute
All-Russian Scientific Research Institute of Non-Organic Materials named after A. Bochvar, Russia, Moscow

Project summary

The objective of this project is to develop a technology for solidification of High Level Wastes ( HLW ). In fact, two options of the technology will be developed. The wastes from the main process stream will be treated using a two step technology. A deep concentration in a direct flow evaporator or calcination of the initial solutions in a spray dryer (SD) will be followed by melting of the product from the first stage with flux in an induction smelting furnace with cold crucible. The final product is a block of material suitable for storage or repository. The second option is a one step technology for non-soluble residues, ashes and pulps. In this case the wastes will be melted in an induction melting furnace with flux materials to form a final product.

The goal of the project is to find the material compositions ensuring leaching rates of radionuclides by a factor of 10-15 times less compared to the leaching rates from phosphate or borosilicate glasses which are considered as the best matrix materials. In the course of the project intensive studies of other matrix materials suitable for incorporation of HLW will be carried out The proposers plan to design and manufacture a laboratory facility to perform experiments for the technology development. The experiments will be performed with simulants of radwastes.

In case of industrial use of technology being developed a double reduction of volume of monolited wastes due to the enhanced efficiency of matrix materials is expected. The low leaching rate of long-lived radionuclides in from the product minerals will allow to reduce the size of costly repositories and secure environmentally safe storange and disposal of HLW.

Expected Results:

At completion of the project two options of the solidification technology for the two types of HLW will be developed. The technologies will be experimentally tested using the newly designed laboratory prototype of an industrial solidification facility.

Technical Approach and Methodology:

A new experimental induction smelting furnace with cold crucible will be manufactured. It will be equipped with a high frequency generator of 25 kWt output power at 5.28 MHz. The planned experimental studies of the matrix materials for solidification will be carried out using this furnace. In the course of the project the procedure and experimental equipment for reliable localisation of long-lived radionuclides in mineral-like compositions will be developed and measurements performed.


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