Modification method for filter material used in filter core of nuclear grade water filter

A water filter and filter material technology, which is applied in the field of modification of filter materials used in nuclear-grade water filter elements, can solve problems such as unsatisfactory, and achieve the effect of improving filtration efficiency and improving leaching resistance

Active Publication Date: 2013-05-08
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Relevant domestic units have also conducted research on the filter materials used in nuclear power plant water filter elements. First, according to the glass fiber composition of foreign samples, glass fibers with basically the same ratio are specially processed; Additives, to treat the surface of the glass fiber, not only to obtain a good bonding effect, but also to further effectively prevent boric acid from corroding the surface of the glass fiber, so that SiO 2 The leaching has been improved to a certain extent, but it still cannot meet the water quality requirements of nuclear power plants

Method used

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  • Modification method for filter material used in filter core of nuclear grade water filter

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Embodiment 1

[0025] The method for modifying the filter material used in the filter element of the nuclear-grade water filter comprises the following steps:

[0026] (1) the chitosan modified polyacrylamide polymer is formulated with distilled water as an aqueous solution with a mass concentration of 1%;

[0027] (2) soak glass fiber filter material 10h with the aqueous solution described in step (1);

[0028] (3) Place the soaked filter material in an oven and dry at 30°C to cross-link the polymer on the filter material;

[0029] (4) Wash the cross-linked filter material with distilled water, dry it in an oven at 30° C., and set it aside.

Embodiment 2

[0031] The method for modifying the filter material used in the filter element of the nuclear-grade water filter comprises the following steps:

[0032] (1) the copolymer of acrylamide and ethyl acrylate trimethyl ammonium chloride is mixed with distilled water and is the aqueous solution of 0.01% in mass concentration;

[0033] (2) with the aqueous solution described in step (1), flow through filter core 30min, the material of filter core is glass fiber filter material;

[0034] (3) place the filter element after flowing through in an oven and dry at 120° C., so that the polymer on the filter element filter material is cross-linked;

[0035] (4) Wash the cross-linked filter element with distilled water, dry it in an oven at 50° C., and set it aside.

Embodiment 3

[0037] The method for modifying the filter material used in the filter element of the nuclear-grade water filter comprises the following steps:

[0038] (1) Cationic polyamide epichlorohydrin polymer is mixed with distilled water and is the aqueous solution of 0.4% in mass concentration;

[0039] (2) Soak the paper filter material with the aqueous solution described in step (1) for 24h;

[0040] (3) Place the soaked filter material in an oven and dry at 80°C to cross-link the polymer on the filter material;

[0041] (4) Wash the cross-linked filter material with distilled water, dry it in an oven at 40° C., and set it aside.

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Abstract

The invention discloses a modification method for a filter material used in a filter core of a nuclear grade water filter. To improve leaching resistance of a filter material in a filter core of a water filter used in a nuclear power station, especially the problem of leaching of SiO2, the invention provides a following scheme: a commercially available glass fiber filter material and a commercially available paper-based filter material are treated with a polyacrylamide polymer aqueous solution, then the filter materials are dried in a baking oven so as to allow polymers on the filter materials to undergo crosslinking, and finally, the filter materials are washed and dried for subsequent usage. With the modification technology for the filter material in the invention, leaching resistance of a plurality of trace elements (especially SiO2) in the filter material can be improved, and filtration efficiency of the filter material on a subsize particle can be enhanced.

Description

technical field [0001] The invention relates to filter material modification technology, in particular to a method for modifying filter materials used in nuclear-grade water filter elements. Background technique [0002] In order to ensure the stable operation of the nuclear power plant, it is necessary to control the water quality of the primary circuit and the secondary circuit. Therefore, water filters for different purposes are installed in the water treatment system, which are mainly used for the purification of the reactor primary circuit coolant and the radioactivity of the boron recovery system. Removal of crushed resin, boric acid crystals and impurities, and removal of suspended solids in intermediate level waste liquid; in addition, it is also used in the main pump shaft seal water, fuel pool water filtration, make-up water, secondary circuit steam generator sewage and other systems . [0003] The filtration accuracy of the filter element is determined according ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/00
Inventor 孔海霞史英霞丘丹圭赵滢侯建荣王瑞云沈大鹏刘鲜丽邓才远乔太飞李永国韩丽红
Owner CHINA INST FOR RADIATION PROTECTION
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