Circulating column experiment device for researching nuclein migration

Abstract

A circulating column experiment equipment for researching the nuclein migration is composed of experiment column, flowmeter, sampler, liquid container and circulating pump. It features that the experiments with different liquid-solid ratios can be conducted by regulating the height of filled adsorption medium and equipping the assembly with corresponding height. Its advantage is high correctness.

Description

technical field [0001] The invention relates to an experimental device, in particular to a circulating column test device. Background technique [0002] The migration behavior of radionuclides is the core issue in the safety assessment and environmental impact assessment of nuclear waste geological disposal. In the study of nuclide migration experiments, two methods are commonly used: static method and dynamic column method. The static method calculates the adsorption-distribution ratio (Kd) by means of liquid phase measurement in the state of adsorption equilibrium, and the Kd value is relatively large compared with the field experimental results. The dynamic column method is to rinse the column with nuclide with water, or flow the solution containing the nuclide through the column with medium, measure the effluent, and finally disassemble the column for measurement. The experiment period is long, and it is difficult to obtain the adsorption distributi...

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Problems solved by technology

The dynamic column method is to rinse the column with nuclide with water, or flow the solution containing the nuclide through the column with medium, measure the effluent, and finally disassemble the column for measurement. The experiment period is long, and it is difficult to obtain the adsorption distribution ratio. Quantitative results, and experimental results are difficult to reproduce

K.H.LISER and U.MOHLENWEG1988 in Radiochemical Acta (44 / 45 129-133) disclose a kind of circulation column experimental device for measuring nuclide adsorption distribution ratio, it comprises circulation pump, needle valve, conical top (conical top), liquid storage container, but the device has the following disadvantages: (1) there is a danger of radioactive solution leakage with a syringe penetrating the rubber tube, especially in the measurement of nuclide migration, which requires multiple sampling, which is more likely to have this danger; ( 2) The entire circulation device is sealed. In the case of low permeability of the experimental medium, the pressure of the pump needs to be increased to allow the liquid to flow through the medium. (3) The two ends of the experimental column are fixed by splint-type four-screw rods, which is cumbersome to disassemble, and only one length-to-diameter ratio experiment can be performed.

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