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Preparation method of magnetic nucleus covered potassium titanium hexacyanoferrate adsorbent and product as well as application

A technology of titanium potassium ferrocyanide and ferrocyanide, which is applied in the field of industrial preparation of magnetic core-coated titanium potassium ferrocyanide adsorbent, can solve the problems of easy explosion, difficult ferrocyanide, and material ratio Small surface area and other problems, to achieve the effect of increasing the load capacity and bonding strength

Inactive Publication Date: 2016-05-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem that ferrocyanide is difficult to spheroidize, but the specific surface area of ​​the synthesized material is small, and a large amount of organic matter remains in the material, which is prone to explosion in the calcination and solidification stage after the treatment of radioactive waste liquid

Method used

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  • Preparation method of magnetic nucleus covered potassium titanium hexacyanoferrate adsorbent and product as well as application
  • Preparation method of magnetic nucleus covered potassium titanium hexacyanoferrate adsorbent and product as well as application
  • Preparation method of magnetic nucleus covered potassium titanium hexacyanoferrate adsorbent and product as well as application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: the laboratory preparation of kilogram grade adsorbent

[0053] The kilogram-scale magnetic core-coated titanium potassium ferrocyanide adsorbent was prepared in a laboratory glass reactor, and the steps were as follows:

[0054] Choose to use industrial magnetic powder or self-made magnetic powder as the carrier;

[0055] (1) Add 8L of absolute ethanol and 1L of tetraethyl orthosilicate (TEOS) into the reaction kettle in sequence, and stir continuously for 20 minutes to dissolve TEOS evenly, then add 4kg of magnet powder with a particle size of about 100 mesh, and heat in a water bath to keep the temperature Continue to stir at 30°C for 2h; then slowly add about 2L of concentrated ammonia water dropwise, and induce the hydrolysis of TEOS to form SiO by base catalysis 2 , the pH will decrease as the reaction proceeds. During the process, a pH meter was used to measure online, and the reaction was controlled by adding ammonia water dropwise to react for 2...

Embodiment 2

[0066] Example 2: Industrial preparation of magnetic core-coated titanium potassium ferrocyanide adsorbent

[0067] The scale-up preparation of the magnetic core-coated titanium potassium ferrocyanide adsorbent is carried out on the production line.

[0068] Choose to use industrial magnetic powder or self-made magnetic powder as the carrier;

[0069] (1) Silicon coating for the first time: First, add absolute ethanol and tetraethyl orthosilicate (TEOS) in the No. Add magnet powder from the solid feeding port under stirring, turn on the oil bath heating system to make the temperature reach 30°C, and continue to stir for 2 hours; then add NaOH solution with a concentration of 1mol / L through the automatic feeding system, and through automatic pH chain control, so that The reaction system was reacted for 1 hour under the condition that the pH was not lower than 11.5; after that, pure water was added through the automatic feeding system, and the water / ethanol volume ratio was 1:8...

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Abstract

The invention discloses a preparation method of a magnetic nucleus covered potassium titanium hexacyanoferrate adsorbent and a product as well as application. According to the magnetic nucleus covered potassium titanium hexacyanoferrate adsorbent and the product as well as the application, the surface of Fe3O4 magnetic powder is first covered with a complete SiO2 protective layer by adopting a two-step reaction method, so that Fe3O4 is difficult to dissolve out in an acidic solution; subsequently, a transitional covering layer TiO2 is prepared under the action of a high temperature, high pressure and vapor by adopting a method of tetrabutyl titanate / alcohol solution immersion and gaseous phase hydrolysis; a Ti<4+> homogeneous-phase hydrolytic action easily occurring in the solution is overcome; the loading capacity and the bonding strength of the TiO2 are improved; finally, potassium ferrocyanide is enabled to react with a TiO2 layer by adopting a method of a surface reaction of a solution phase, a component of a generated active potassium titanium hexacyanoferrate absorbent is enabled to firmly grow on the surface of a magnetic nucleus, and a magnetic nucleus covered potassium titanium hexacyanoferrate caesium-removing adsorbent with magnetism is prepared. Measured through a test, the absorbent has a favorable adsorption removal characteristic to Cs<+>, and is suitably applied to the removal of a radioactive waste liquid, which is smaller in scale and is further strong in dispersity, of a nuclear power plant by adopting a sequencing batch type dynamic adsorption reactor mode.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to an industrial preparation method of a magnetic core-coated titanium potassium ferrocyanide adsorbent as well as its product and application. Background technique [0002] As an important clean energy, nuclear power is gradually becoming an important part of my country's energy structure. In the Fukushima nuclear accident in Japan, the rapid and efficient removal of radioactive waste has become a key issue in post-accident treatment. Taking the Fukushima accident as a warning, it is very important and urgent to establish an emergency mechanism for nuclear power plant accidents and carry out research on emergency treatment technology for radioactive waste in my country. [0003] Taking the treatment process in Fukushima as an example, the radioactive waste liquid has different levels of pollution due to contact with damaged reactor fuel elements and other contaminated components...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30B01J20/28B01J19/18G21F9/12
CPCB01J19/18B01J20/02B01J20/0211B01J20/0274B01J20/04B01J20/06B01J20/103B01J20/28009B01J2220/42B01J2220/4806B01J2220/4812C02F1/281G21F9/12
Inventor 尉继英赵璇成徐州
Owner TSINGHUA UNIV
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