A kind of oxidation adjustment equipment for oxidizing pu(iii) to pu(iv)

Abstract

The invention belongs to the technical field of nuclear fuel reprocessing and discloses an oxidizing valence-adjusting equipment for oxidizing Pu (III) to Pu (IV). The equipment mainly comprises an oxidizing tower, a feed liquid receiving tank and a NOX storage tank, wherein a feed liquid outlet is formed at the upper end of the oxidizing tower, a Pu (III) feed liquid inlet and a NOX feed inlet are formed at the lower end, and the feed liquid outlets at the upper parts of the feed liquid receiving tank and the oxidizing tower are connected by virtue of a pipeline; the main body of the oxidizing tower and packing in the tower are both radiation-resistant and nitric acid corrosion-resistant materials; a heating device is arranged on the outer tower wall of the oxidizing tower; the Pu (III) feed liquid enters the oxidizing tower from the Pu (III) feed liquid inlet at the lower part of the oxidizing tower; NOX gas provided by the NOX storage tank enters into the oxidizing tower from the NOX feed inlet at the lower part of the oxidizing tower separately or together with carrier gas; the valence-adjusted feed liquid enters the feed liquid receiving tank from the feed liquid outlet at the upper part of the oxidizing tower. The equipment is large in processing scale, high in NOx utilization ratio, safe and stable in valence-adjusting process and low in processing burden of nitric oxide tail gas.

Description

technical field

[0001] The invention belongs to the technical field of nuclear fuel reprocessing, and in particular relates to an oxidation price adjustment device for plutonium in 1BP to 2AF and 2BP feed liquid before plutonium precipitation conversion in the nuclear fuel reprocessing Purex process. Background technique

[0002] The post-treatment process usually uses reducing agents such as U(IV)-hydrazine, hydroxylamine-hydrazine or N,N-dimethylhydroxylamine-methylhydrazine to reduce and strip Pu(Ⅲ), and the 1BP feed liquid obtained after the separation of uranium and plutonium The middle plutonium is trivalent, and Pu(Ⅲ) needs to be adjusted to Pu(Ⅳ) before purifying and concentrating plutonium in the next step through extraction-stripping; at the same time, the Pu(Ⅲ) nitrate solution obtained from the plutonium purification cycle is in the precipitation conversion step It needs to be converted to Pu(Ⅳ). The traditional post-treatment process uses sodium nitrite (NaNO ...

Examples

Embodiment 1

[0031] A kind of oxidation adjustment device that Pu(III) is oxidized to Pu(IV), such as figure 1 As shown, the equipment mainly includes oxidation tower 5, feed liquid receiving tank 20 and NO X Storage tank 2, wherein the upper end of oxidation tower 5 is provided with feed liquid outlet 17, and the lower end is provided with Pu(III) feed liquid inlet 22 and NO X Feed inlet 6, feed liquid receiving tank 20 and feed liquid outlet 17 on the top of oxidation tower 5 are connected by pipelines; wherein the main body of oxidation tower 5 and the packing in the tower are all radiation-resistant and nitric acid corrosion-resistant stainless steel west tower rings; An electric heating plate 10 is set on the outer wall of the tower 5, so that the temperature of the liquid in the tower is 40°C; a neutron-absorbing material is set in the middle of the oxidation tower 5 10 B 4 c. A demister 14 is installed on the top of the oxidation tower 5 to separate the feed liquid entrained by t...

Embodiment 2

[0041] The difference from Example 1 is that one or more sieve plates are arranged inside the oxidation tower 5 to separate the packing; the heating method of the gasification tank 3 is water bath heating, and the heating temperature is 90 ° C; the heating method of the oxidation tower 5 In order to wind a layer of heating water jacket on the outer wall of the tower, the temperature of the liquid in the tower is 50°C; the neutron-absorbing material placed on the wall of the oxidation tower 5 is 6 LiF; NO X The highest point of the inverted U-shaped tube through which the gas enters the oxidation tower body is 300mm higher than the outlet of the feed liquid.

Embodiment 3

[0043] The difference from Example 1 is that the heating method of the oxidation tower 5 is to wrap a layer of electric heating tape on the outer wall of the tower, so that the temperature of the feed liquid in the tower is 40 ° C; NO X is NO, NO and oxygen are jointly formed by NO X The feed inlet enters the tower, where the oxygen content is twice that of NO; ​​NO X The highest point of the inverted U-shaped tube through which the gas enters the oxidation tower body is 400mm higher than the outlet of the feed liquid.

technical field

[0001] The invention belongs to the technical field of nuclear fuel reprocessing, and in particular relates to an oxidation price adjustment device for plutonium in 1BP to 2AF and 2BP feed liquid before plutonium precipitation conversion in the nuclear fuel reprocessing Purex process. Background technique

[0002] The post-treatment process usually uses reducing agents such as U(IV)-hydrazine, hydroxylamine-hydrazine or N,N-dimethylhydroxylamine-methylhydrazine to reduce and strip Pu(Ⅲ), and the 1BP feed liquid obtained after the separation of uranium and plutonium The middle plutonium is trivalent, and Pu(Ⅲ) needs to be adjusted to Pu(Ⅳ) before purifying and concentrating plutonium in the next step through extraction-stripping; at the same time, the Pu(Ⅲ) nitrate solution obtained from the plutonium purification cycle is in the precipitation conversion step It needs to be converted to Pu(Ⅳ). The traditional post-treatment process uses sodium nitrite (NaNO ...

Examples

Embodiment 1

[0031] A kind of oxidation adjustment device that Pu(III) is oxidized to Pu(IV), such as figure 1 As shown, the equipment mainly includes oxidation tower 5, feed liquid receiving tank 20 and NO X Storage tank 2, wherein the upper end of oxidation tower 5 is provided with feed liquid outlet 17, and the lower end is provided with Pu(III) feed liquid inlet 22 and NO X Feed inlet 6, feed liquid receiving tank 20 and feed liquid outlet 17 on the top of oxidation tower 5 are connected by pipelines; wherein the main body of oxidation tower 5 and the packing in the tower are all radiation-resistant and nitric acid corrosion-resistant stainless steel west tower rings; An electric heating plate 10 is set on the outer wall of the tower 5, so that the temperature of the liquid in the tower is 40°C; a neutron-absorbing material is set in the middle of the oxidation tower 5 10 B 4 c. A demister 14 is installed on the top of the oxidation tower 5 to separate the feed liquid entrained by t...

Embodiment 2

[0041] The difference from Example 1 is that one or more sieve plates are arranged inside the oxidation tower 5 to separate the packing; the heating method of the gasification tank 3 is water bath heating, and the heating temperature is 90 ° C; the heating method of the oxidation tower 5 In order to wind a layer of heating water jacket on the outer wall of the tower, the temperature of the liquid in the tower is 50°C; the neutron-absorbing material placed on the wall of the oxidation tower 5 is 6 LiF; NO X The highest point of the inverted U-shaped tube through which the gas enters the oxidation tower body is 300mm higher than the outlet of the feed liquid.

Embodiment 3

[0043] The difference from Example 1 is that the heating method of the oxidation tower 5 is to wrap a layer of electric heating tape on the outer wall of the tower, so that the temperature of the feed liquid in the tower is 40 ° C; NO X is NO, NO and oxygen are jointly formed by NO X The feed inlet enters the tower, where the oxygen content is twice that of NO; ​​NO X The highest point of the inverted U-shaped tube through which the gas enters the oxidation tower body is 400mm higher than the outlet of the feed liquid.

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