Preparation method of particulate cesium removal inorganic ion adsorbent, and product and application of adsorbent

A technology of inorganic ions and adsorbents, which is applied in the preparation of composite adsorption materials and in the field of granular inorganic ion adsorbents. It can solve the problems of active ingredient loss, secondary pollution, and reduced adsorbent performance, and achieve high adsorption performance and stable structure. , the effect of broad application prospects

Active Publication Date: 2016-09-21
TSINGHUA UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, in practical applications, ferrocyanide generally has small particle size and poor hydraulic properties, so it cannot be operated on the column, and the separation of solid and liquid phases is very difficult; in addition, the internal mass transfer conditions of ferrocyanide particles are poor, and the inner layer adsorption Agents are often not fully utilized (Nuclear Chemistry and Radiation Chemistry, 23, 108-113, 2001)
In view of this problem, domestic and foreign counterparts usually adopt immobilization technology, one is to load ferrocyanide on the surface of carriers such as silica (Separation and Purification Technology 16, 147-158, 1999), and its disadvantage is: the active group The loading capacity of the component is low; the process of using transition metal ions to fix ferrocyanide is difficult to complete, and the active ferrocyanide component is easy to lose during use
The other is to combine the adsorbent with PAN to make inorganic / organic hybrid pellets (Chinese patent CN1319849A). The problem is that the binder is easy to block the surface area pores of the adsorbent and reduce the performance of the adsorbent.
However, excessive accumulation of metal salts leads to a large amount of active ingredients on the surface of the carrier to be easily lost during use, thereby reducing the service life of the adsorbent and causing secondary pollution problems

Method used

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  • Preparation method of particulate cesium removal inorganic ion adsorbent, and product and application of adsorbent
  • Preparation method of particulate cesium removal inorganic ion adsorbent, and product and application of adsorbent
  • Preparation method of particulate cesium removal inorganic ion adsorbent, and product and application of adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: the laboratory preparation of five kinds of silica gel-loaded adsorbents

[0059] Two-step impregnation method to prepare silica-supported adsorbent:

[0060] 1) Add 4L of deionized water to five 10L beakers respectively, add: A-630g of Co(NO 3 ) 2 ·6H 2 O; B - 790g of CuSO 4 ·5H 2 O; C-180g (CH 3 COO) 2 Zn·2H 2 O; D-1020g of ZrO(NO 3 ) 2 ; E-430g FeCl 3 ·6H 2 O. Heat and stir until completely dissolved, then pour the five solutions into five enamel trays each containing 1kg of silica gel particles, the solution is basically immersed in all the silica gel, and stand for 3 hours, stirring often during the process to make the particles impregnated evenly. Then put the 5 trays in a constant temperature oven and dry them at 120°C for 10 hours, then take them out and cool down naturally to obtain silica gel intermediates impregnated with different ions.

[0061] 2) Add 5L of deionized water to each of the five 10L beakers of A, B, C, D, and E, resp...

Embodiment 2

[0067] Example 2: Trial production of a single batch of 500kg KCuHCF-S

[0068] Add 500L of water to a 1 ton reaction box, and add 395kg of CuSO 4 ·5H 2 O, heated to 80°C with continuous stirring to dissolve completely. Then add 500kg of silica gel carrier, impregnate at 80°C for 12 hours, and stir frequently during the process to make the adsorption process uniform. Afterwards, the material was filtered, placed in a tray, and dried in an electric blast drying room at 120°C for 24 hours. The filtrate was collected and the water uptake of the first maceration was determined by volume. Pour the filtrate back into the reaction box, and add water in it, so that the volume of the solution is equal to the amount of water absorbed for the first time. Put the dried material into the reaction box again, repeat the first impregnation process and operating conditions until the solution is basically absorbed. Place the material in a tray again, and dry it in an electric blast drying ...

Embodiment 3

[0071] Example 3: Trial production of 500kg KZnHCF-S in a single batch

[0072] Add 500L water in 1 ton of reaction box, add 92kg (CH 3 COO) 2 Zn·2H 2 O, heated to 40°C with continuous stirring to dissolve completely. Then add 500kg of silica gel carrier, impregnate at 40°C for 12 hours, and stir frequently during the process to make the adsorption process uniform. Afterwards, the material was filtered, placed in a tray, and dried in an electric blast drying room at 120°C for 24 hours. The filtrate was collected and the water uptake of the first maceration was determined by volume loss. Pour the filtrate back into the reaction box, add water to make the volume of the solution equal to the first water absorption. Put the dried material into the reaction box again, repeat the first impregnation process and operating conditions until the solution is basically absorbed. Place the material in the tray again, and dry it in an electric blast drying room at 120°C for 24 hours to...

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Abstract

The invention relates to a preparation method of a particulate cesium removal inorganic ion adsorbent, and a product and application of the adsorbent. Concretely, firstly, according to the single-layer dispersion principle of salts on the oxide carrier surface, the single-layer dispersion threshold value of M<n+> ion salt on the silica gel surface is measured by an X ray diffraction method; the single-layer dispersion threshold value is used as the optimal M<n+> ion salt load quantity. During the adsorbent preparation, a certain concentration of M<n+> ion salt is firstly used for fully impregnating silica gel particles, so that M<n+> ions are loaded on the silica gel surface to form a dispersion single layer, and the strong bonding force is formed between the M<n+> ions and silica gel; then, a potassium ferrocyanide solution is used for fully soaking an intermediate M / SiO2, so that potassium ferrocyanide and the M<n+> ions at the surface take a reaction; a ferrocyanide with strong bonding force and stable M ions is generated on the silica gel surface. Through Cs<+> adsorption performance measurement, fixed bed reactor cold experimental determination and fixed bed reactor 137Cs radioactive tracing experiment verification, the silica gel load ferrocyanide prepared by the method has good adsorption performance on Cs<+>.

Description

technical field [0001] The invention relates to a method for removing radioactive waste liquid 134 Cs / 137 The invention relates to a granular inorganic ion adsorbent for Cs ions and an industrial preparation method thereof, in particular to a preparation method of a composite adsorption material. The material uses silica gel as a carrier, and uses a surface monolayer dispersion technology to load a series of metal ion-stabilized ferrocyanide active components, in which the stable metal ions include Fe 3+ 、Co 2+ 、Cu 2+ , Zn 2+ and Zr 4+ Wait. The formed granular adsorbent is suitable for filling in fixed-bed adsorption reactors and applied to the waste liquid treatment process of nuclear power plants and other nuclear facilities. The invention belongs to the technical field of material preparation and radioactive waste water treatment. Background technique [0002] As an important clean energy, nuclear power is gradually becoming an important part of my country's ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30G21F9/12
CPCB01J20/0211B01J20/0225B01J20/0229B01J20/0237B01J20/0244B01J20/0274B01J20/103B01J2220/42B01J2220/4806G21F9/12B01J20/04B01J20/223B01J20/28064B01J20/28066B01J20/3085B01J20/3204B01J20/3236C02F1/281C02F1/288C02F2101/006
Inventor 赵璇尉继英成徐州
Owner TSINGHUA UNIV
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