Methyl iodide adsorbent and preparation method thereof
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An adsorbent, methyl iodide technology, applied in the field of methyl iodide adsorbent and its preparation, can solve the problems of cost reduction, high cost, poor adsorption effect, etc., achieve high efficiency, high hydrothermal, and improve silver utilization Effect
Inactive Publication Date: 2021-06-25
718TH RES INST OF CHINA SHIPBUILDING INDAL CORP +1
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[0007] In view of the problems in the prior art that the cost of radioactive methyl iodide adsorbent is high, the adsorption performance is difficult to apply or the adsorption effect is not good under high humidity conditions or high temperature and high humidity and other harsh environmental conditions, one of the purposes of the present invention is to provide a methyl iodide Base iodide adsorbent, the adsorbent still has a high filtration efficiency for radioactive methyl iodide at low silver content, improves the utilization rate of silver, and greatly reduces costs; at the same time, the adsorbent can It also has a high filtration efficiency for radioactive methyl iodide, which improves the utilization rate of silver
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Embodiment 1
[0035] (1) The silicone ratio of the BETA molecular sieve powder is = 20, and the aperture size is Purchase Dalian Zhuoran Environmental Technology Co., Ltd., after mixing the dry beta molecular sieve powder and clays, the water is added to the water, and the total mass of the beta molecular sieve powder and clay is 100%, and the mass fraction of the clay is 20%; then Extruded the blasting machine granules, then dried overnight, 500 ° C for 6 h; finally sieved with a sampling screen, the sieve particle size is 1.5 mm to 2.5 mm to obtain BETA molecular sieve particles.
[0036] (2) The BETA molecular sieve particles obtained by step (1) were added to 1000 ml of a silver nitrate solution of 1 m, and the heated ion exchange at 40 ° C water bath was exchanged for 8 h, and silver ions were introduced into a molecular sieve, and then filtered, and excess nitric acid was washed. Silver, 100 ° C dried overnight, calcined at 500 ° C under the air atmosphere to obtain a silver BETA molecul...
Embodiment 2
[0042] (1) Referring to the literature (chemical progress, 2007 (26) 7, 921-926), the ZSM-12 molecular sieve powder, silicone ratio = 150, the hole size is After mixing the dry ZSM-12 molecular sieve powder and clays were mixed with water, the water was added, and the total mass of the ZSM-12 molecular sieve powder and the clay total was 100%, and the mass fraction of the clay was 20%; then the extrusion shot blasting machine Particles, then dried overnight, 500 ° C for 6 h at 500 ° C; finally sieved by a sampling screen, the sieve particle size is 1.5 mm to 2.5 mm to obtain ZSM-12 molecular sieve particles.
[0043] (2) The ZSM-12 molecular sieve particles obtained by step (1), the remaining steps are the same as in Example 3, and the silver ZSM-12 molecular sieve is obtained, which is a methyl iodine adsorbent according to the present invention.
[0044] The methyleneiodine adsorbent made in this example was tested, and the test results were as follows:
[0045] (1) It is detec...
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Abstract
The invention relates to a methyl iodide adsorbent and a preparation method thereof, and belongs to the technical field of environmental protection. The adsorbent is a silver-loaded molecular sieve prepared by taking aluminosilicate molecular sieve particles as a carrier through a silver salt aqueous solution in an ion exchange manner, and the mass fraction of silver in the adsorbent is 3-10%. The preparation method comprises the following steps: by taking aluminosilicate molecular sieve particles as a carrier and water-soluble silver salt as a silver source, carrying out ion exchange at room temperature to 100 DEG C for 1-48 hours, introducing silver ions into the molecular sieve, filtering, washing, and carrying out heat treatment at 400-700 DEG C in the atmosphere of air, nitrogen or inert gas for 1-12 hours to prepare the adsorbent. The adsorbent still has very high filtering efficiency on radioactive methyl iodide under the condition of low silver content, the utilization rate of silver is increased, and the cost is greatly reduced; Meanwhile, the adsorbent has very high filtering efficiency on radioactive methyl iodide under the high-humidity working condition, and the utilization rate of silver is increased.
Description
Technical field [0001] The present invention relates to a methyl iodine adsorbent and a preparation method thereof, belonging to the field of environmental protection. Background technique [0002] In view of the advantages of nuclear energy, the greenhouse gas discharge is small, and the low power generation is low, nuclear power generation is an important power generation. However, during the operation of nuclear energy, in particular, a large amount of radioactive substance is generated during a serious accident and the risk of fuel treatment, including radioactive aerosols, radioactive monosyl iodine, radioactive methyl iodine, and radioactive inert gas. Among them, radioactive methyliodine is an important radioactive contaminant that leaked radioactive methyl iodide in the atmosphere, is easily absorbed by human thyroid, and thrommitar pathogenesis or even forming thyroid cancer. After the Japanese Fukushima nuclear accident in 2011, the radioactive methyl iodine has a great...
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