Processing method

Abstract

The present invention provides a treatment method that can reduce the concentration of radioactive contaminants such as Cs in the ash to be treated. [Solution] The processing method comprises a first water washing step S10 in which the ash to be treated containing the recovered radioactive material is washed with water, an acid washing step S20 in which the ash to be treated washed in the first water washing step S10 is washed with acid, and a second water washing step S30 in which the ash to be treated washed in the acid washing step S20 is washed with water.

Claims

1. The first water washing process involves washing the treated ash containing the recovered radioactive material with water, The first water washing step involves washing the ash to be treated with acid, and A method for treating ash to be treated, comprising the following components.

2. The method for treating ash according to claim 1, further comprising a second water washing step of washing the ash that has been washed in the acid washing step with water.

3. The treatment method according to claim 1 or 2, wherein the acid is hydrochloric acid.

4. The treatment method according to claim 1 or 2, wherein the molar equivalent ratio of the acid-soluble component contained in the ash to be treated washed in the first water washing step to the acid is 0.8 to 1.

2.

5. The treatment method according to claim 1 or 2, wherein the concentration of the acid is 1 to 8% by weight.

6. A first dewatering step is performed on the ash to be treated after the first water washing step, A second dewatering step involves dewatering the ash to be treated after the acid washing step, Equipped with, The treatment method according to claim 1 or 2, wherein the ash to be treated after the first dewatering step is washed with acid in the acid washing step.

7. The processing method according to claim 1 or 2, wherein the radioactive material contains radioactive cesium.

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