Treatment method of waste graphite crucible
A treatment method and technology for waste graphite, applied in nuclear engineering, radioactive purification, etc., can solve the problems of high cost and heavy workload, and achieve the effect of reducing treatment cost, combustion cost and personnel work intensity.
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Embodiment 1
[0020] Step 1: Carry out source term investigation on the contaminated layer of the waste graphite crucible to determine the depth of contamination and the degree of contamination on the surface;
[0021] Step 2: Before ashing, the inner surface of the polluted part of the waste graphite crucible is mechanically cut; the polluted part is subjected to ashing treatment, and the non-polluted part is preserved.
[0022] The volume of the waste graphite crucible exceeds 200L, and the wall thickness is relatively thick, which is convenient for cutting.
[0023] The ashing temperature T range of the waste graphite crucible is 650°C ≤ T1 ≤ 800°C, and the heating process is as follows: after rising to 200°C, heat preservation for 1 hour, after heat preservation, continue to heat up, every 100°C heat preservation for 1 hour, the temperature rise and heat preservation time are collectively referred to as reaction Time, the range of reaction time t is 90h≤t≤120h, until the waste graphite ...
Embodiment 2
[0026] Step 1: Carrying out source item investigation on the pollution layer in the waste graphite crucible to determine its pollution elements and pollution degree;
[0027] Step 2: Ashing the graphite crucible, after a certain period of time, the polluted part is all ashed, and the non-polluting part is kept.
[0028] Step three, clean up the non-polluted part.
[0029] The volume of the waste graphite crucible exceeds 200L, and the wall thickness is relatively thick.
[0030] The uranium content on the inner surface of the waste graphite crucible is 20% to 70%, and other elements are mainly C, O and Y.
[0031] In the ashing process of the waste graphite crucible, the outer surface is in contact with the material boat.
[0032] The ashing temperature T range of the waste graphite crucible is 650°C ≤ T1 ≤ 800°C, and the heating process is as follows: after rising to 200°C, heat preservation for 1 hour, after heat preservation, continue to heat up, every 100°C heat preserva...
Embodiment 3
[0034] Embodiment 3: mechanical separation-ashing
[0035] Step 1: Take a waste graphite crucible with an outer diameter of 500 mm, an inner diameter of 400 mm, a height of 620 mm, and a wall thickness of 50 mm for source investigation. The surface activity of the waste graphite crucible after cleaning with a brush is less than 1Bq / cm 2 , when treated to a depth of 10mm, all meet the surface pollution level of less than 0.08Bq / cm 2 , up to the exemption level.
[0036] Step 2: Take a complete graphite crucible to remove the surface oxide layer and then perform preliminary crushing, select a graphite block with a larger area after crushing and cut off the inner surface of 10mm.
[0037] Step 3: After the cut part is crushed for the second time, it is evenly loaded into two boats, each boat is filled with 500g, the ashing temperature is 800°C, the reaction time is 90h, and the air flow rate is 300L / h. The ashed part of the pollution accounts for about 20% of the total mass. ...
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