Washing and recovering method for MOX powder contaminating grinding balls

Abstract

The invention relates to a washing and recovering method for MOX powder contaminating grinding balls. The washing and recovering method comprises: 1, selecting 50-500 g of ZrO2 grinding balls contaminated with MOX powder and having a diameter of 1.5-15 mm, analytically pure ethanol, HF acid and spherical ZrO2 powder having a particle size of 0.1-1.5 [mu]m and a specific surface area of 2.5-28 m<2> / g; 2, preparing a washing abrasive material according to a ratio of HF to ZrO2 of (0.1-1%):(1-10%), calculating the required grinding ball amount according to a filling rate of 5-25%, and washing theMOX powder slightly attached to the surface; 3, gradually increasing the ball milling speed, stirring at a rotation speed of 50-200 rpm for 30-90 min while introducing He at a speed of 5-10 L / h, removing the MOX powder from the surface of the grinding balls, and gradually decreasing the stirring speed at a speed of 10-50 r / min; 4, transferring the grinding balls obtained in the step 3 into a beaker, adding dehydrated alcohol according to a ratio of 1:1, and placing into vibration cleaning equipment; and 5, removing volatile impurities from the MOX powder-containing solutions collected in thesteps 3 and 4.

Description

technical field [0001] The invention belongs to the field of cleaning and recycling, and in particular relates to a method for cleaning and recycling MOX powder contaminated by grinding balls. Background technique [0002] Ball milling is a key technical process for the preparation of MOX fuel pellets, and a key link to realize the mixing and refinement of uranium dioxide, plutonium dioxide and pore-forming agents. In order to ensure that the particle size, specific surface, shape, uniformity, impurity introduction and other parameters of the powder meet the process control requirements, it is necessary to add a certain amount of balls for ball milling. During this process, the surface of the balls will be adhered to MOX powder. Since uranium and plutonium metals are non-renewable priority precious resources and have strong radioactivity, it is necessary to treat the contaminated MOX powder on the surface of the grinding ball, clean the grinding ball, and recover the uraniu...

AI Technical Summary

Problems solved by technology

[0003] At present, the balls contaminated with MOX powder involved in the nuclear industry are basically collected in storage containers. There are three deficiencies. The grinding balls are cleaned, resulting in a large number of grinding balls temporarily stored, and the utilization rate is low; the second is that MOX powder has a high viscosity, and it is difficult to solve the problem of grinding ball contamination by ordinary cleaning methods. At the same time, due to the critical characteristics of nuclear materials, it is impossible to introduce a large amount of Cleaning fluid; thirdly, MOX powder is attached to the grinding balls. A large amount of accumulation is not conducive to maximizing the utilization rate of uranium and plutonium materials, and there is a risk of material spillage and loss. At the same time, the accumulated materials pose a risk of radiation to nearby operators.