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Electrolytic decontamination method

An electrolyte and ultrasonic technology, applied in the field of pipe fittings treatment, can solve the problems of low electrolysis efficiency, discontinuous electrolysis process, difficulty in increasing current utilization efficiency, etc., and achieve the effect of optimizing decontamination effect and improving efficiency

Inactive Publication Date: 2019-03-01
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the electrolytic decontamination process, the electrolytic process is discontinuous and the electrolytic efficiency is low due to impurities and scaling on the metal surface to be decontaminated, which makes it difficult to increase the current utilization efficiency in the electrolytic decontamination process

Method used

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  • Electrolytic decontamination method

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Embodiment 1

[0035] An electrolytic decontamination method, comprising the following steps: under ultrasonic conditions, using titanium as the anode and platinum as the cathode, under the action of conductive balls, decontaminating metal pipe fittings polluted by radionuclide cobalt and silver at 40°C Electrolytic decontamination; the frequency of the ultrasound is 28kHz; the current density is 2000A / m 2 The distance between the anode and the cathode is 15mm; the electrolyte includes nitric acid with a mass concentration of 10% and sulfuric acid with a mass concentration of 10%; the electrolysis time is 10min;

[0036] Under the situation that above-mentioned parameter is determined, research the impact of conductive pellet material on electrolytic decontamination efficiency: described conductive pellet is respectively the particle diameter of 2mm copper particle, titanium particle, lead particle and graphene pellet particle; Simultaneously study The electrolytic decontamination rate witho...

Embodiment 2

[0040] An electrolytic decontamination method, comprising the following steps: under ultrasonic conditions, using titanium as an anode and platinum as a cathode, under the action of conductive balls, performing electrolytic decontamination on metal pipe fittings contaminated by uranium at 40°C; The frequency of the ultrasound is 28kHz; the current density is 2000A / m 2 ; In the electrolyte, the mass concentration is 10% phosphoric acid and 10% sulfuric acid; the conductive ball is a titanium ball with a particle diameter of 2 mm;

[0041] In the case of determining the above parameters, the influence of the distance between the cathode and the anode on the electrolytic decontamination efficiency is studied: the distance between the cathode and the anode is 13mm, 15mm, 19mm, 25mm according to the inner diameter of different contaminated metal pipes, and the electrolysis time is 5min; The electrolytic decontamination efficiency of the contaminated metal pipe fittings was measured...

Embodiment 3

[0045] An electrolytic decontamination method, comprising the following steps: under ultrasonic conditions, using titanium as the anode and platinum as the cathode, and under the action of titanium conductive balls, the surface pollution is 15.3Bq / cm at 40°C 2 The polluted metal pipe fittings are electrolyzed and decontaminated; the frequency of the ultrasound is 40kHz; the current density is 2000A / m 2 ; The distance between the anode and the cathode is 15mm;

[0046] Under the situation that above-mentioned parameter is determined, research different electrolytes to the influence of electrolysis decontamination rate: wherein one electrolyte is the sulfuric acid that mass concentration is 20%; Include mass concentration in an electrolyte liquid and be that the phosphoric acid of 10% and mass concentration are 10% sulfuric acid; one electrolyte includes nitric acid with a mass concentration of 10% and sulfuric acid with a mass concentration of 10%; after electrolysis for 10 min...

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Abstract

The invention provides an electrolytic decontamination method, and belongs to the technical field of pipe processing. The electrolytic decontamination method comprises the steps of electrolytically decontaminating a radioactively contaminated metal pipe under the action of conductive balls by using titanium as an anode and platinum as a cathode under ultrasonic conditions, wherein the ultrasonic frequency is 20-40 kHz. The ultrasonic is added in the electrolysis process, and high-speed micro jet generated by ultrasonic cavitation strengthens the stirring action of an electrolyte in the electrolysis process, strengthens the transport capacity of ions in the electrolyte, reduces the thickness and the concentration gradient of a diffusion layer, reduces concentration polarization, and optimizes the electrolytic decontamination conditions. The ultrasonic can permeate the surface and the gap of the contaminated metal pipe, so that the decontaminated metal surface is thoroughly cleaned, andthe electrolytic decontamination efficiency is improved. From an embodiment, the surface decontamination rate and the electrolysis depth of a metal material are significantly improved after the ultrasonic is added.

Description

technical field [0001] The invention relates to the technical field of pipe fitting treatment, in particular to an electrolytic decontamination method. Background technique [0002] During decommissioning of nuclear facilities, operation of nuclear power plants and refueling overhaul, a certain amount of metal equipment and pipe fittings contaminated by radioactive substances will inevitably be produced. In order to protect the surrounding environment from radioactive pollution, prevent excessive radioactive exposure to workers and residents, and minimize radioactive waste, all metal materials contaminated by radioactive substances must be decontaminated before entering the environment and final disposal. . [0003] The principle of electrolytic decontamination is that the metal to be electrolyzed is connected to the anode of the DC power supply, which corresponds to the cathode in the electrolyte. If an external power supply applies a voltage between the two poles, the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F1/06
CPCC25F1/06
Inventor 王东文刘艳张灏赵庆凯周狂飙张曼
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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