KR870010564A - Method and apparatus for encapsulating low and medium level radioactive waste as hydroponic cement - Google Patents

Abstract

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Description

Method and apparatus for encapsulating low and medium level radioactive waste as hydroponic cement

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Claims (8)

A method for encapsulating low and medium levels of radioactive wastes containing borate by hydroponic system by chemical treatment for producing crystals of calcium tetrahydrate, reduced capacity and mixing the obtained product with one or more hydraulic cements, comprising: A method consisting of steps; -Calcium tetraborate tetrahydrate is formed by adding the calculated amount of lime to the solution to be treated to form borate B ₂ O ₃ C _a O: A capacity reduction operation is carried out on this solution and / or suspension by evaporation under reduced pressure, said reduced pressure being about 0.1-0.3 bar and applied after the preparation step of the calcium tetrahydrate crystal: And continue with the above capacity reduction until a concrete suspension containing about 30-70% of the dry matter is obtained. The method of claim 1, wherein the waste is subjected to reduced pressure evaporation prior to forming the crystals of calcium tetrahydrate. The method of claim 1 wherein the whole crystallization step is carried out under reduced pressure of about 0.7-0.9 bar. A method of encapsulating low and medium levels of radioactive waste containing borate by hydroponic cement, by chemical treatment to produce crystals of hydrated calcium borate, reduction in capacity, and by mixing the obtained product with one or more hydraulic cements. The step of preparing the crystal of calcium borate is the first step of forming a nucleus by applying lime, the second step of forming a mixed salt, the third step of forming the calcium salt and the fourth step of ripening the crystal of the borate described above. And a reduction in capacity under reduced pressure is also carried out during one or more of the first and fourth steps described above, and after the step of producing crystals of calcium tetrahydrate, if possible. 5. The method of claim 4, wherein the waste is further subjected to reduced pressure evaporation prior to forming the crystals of calcium tetrahydrate. The process of claim 4 wherein the whole crystallization step is carried out under reduced pressure of about 0.7-0.9 bar. 5. The method of claim 4, wherein calcium hexahydrate is formed during the third step, which is subsequently converted to calcium tetrahydrate, during the fourth step, to produce crystals of calcium tetrahydrate. A device for encapsulating low and medium levels of radioactive wastes containing borate by hydroponic cement, by chemical treatment to produce crystals of calcium tetrahydrate, reduced capacity and by mixing the obtained product with one or more hydraulic cements. In one (or two) devices, consisting of a semi-evaporator-evaporator and a temperature maintenance device, an efficient stirrer for fluids with different agitation speeds and different viscosities and generating a pressure of about 0.1-1 bar A device that discontinuously encapsulates. ※ Note: The disclosure is based on the initial application.