Sodium zirconium phosphate-monazite glass ceramic solidified body and preparation method thereof

Abstract

The invention discloses a zirconium sodium phosphate-monazite glass ceramic solidified body and a preparation method thereof. The solidified body is prepared by taking the following raw materials in parts by weight: 30-60 parts of P2O5, 10-35 parts of Fe2O3, 1-4 parts of B2O3, 3.5-14 parts of CeO2, 6-32 parts of ZrO2 and 1.5-8 parts of Na2CO3 and carrying out mixing, pre-sintering and ball-milling, thus obtaining substrate raw material powder; and then mixing 45-100 parts of substrate raw material powder and 0-55 parts of high-level radioactive wastes or simulated high-level radioactive wastes by weight and carrying out ball-milling, forming under pressure and sintering, thus preparing the solidified body. The zirconium sodium phosphate-monazite glass ceramic solidified body has high occlusion capacity toward the high-level radioactive wastes, high volume reduction ratio and good stability; and the preparation process is simple, is easily applied to engineering and can be widely used for solidified disposal of the high-level radioactive wastes.

Description

technical field [0001] The invention belongs to the treatment and disposal of radioactive nuclear waste, and relates to a sodium zirconium phosphate-monazite glass ceramic solidified body and a preparation method thereof. It is especially suitable for solidification treatment of high-level waste containing plutonium and transuranic elements (ie high-level radioactive waste) discharged from nuclear industry and other fields. Background technique [0002] The peaceful use of nuclear energy has had a profound impact on the improvement of people's living standards and scientific and technological progress in my country and the world, and has become an indispensable part of human progress. However, the development of the nuclear industry will inevitably produce a large amount of radioactive waste, especially high-level radioactive waste. Once these radionuclides enter the biosphere, they will bring catastrophic radioactive pollution to the people of the world, which must be prope...

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Problems solved by technology

However, the radiation stability and thermal stability of iron phosphate vitrified body are poorer than those of borosilicate vitrified body, which limits its practical application.

In addition, according to practical experience, whether it is a borosilicate system or a phosphate system glass solidified body, the containment capacity of high-level radioactive waste is relatively low, and it is easy to form uncontrollable crystallites in the solidified glass in actual operation. phase or produce uncontrollable phase separation, resulting in a sharp decrease in the stability of the cured body

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