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A method for solidifying alkali slag cement of nuclear power plant boron-containing waste resin

A technology of alkali slag cement and solidification method, which is applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., and can solve the problems of delamination between resin and cement slurry, insufficient solidification of solidified body, and small resin inclusion capacity. It achieves the effects of small hydration heat release, large-volume curing, and good anti-leaching performance

Active Publication Date: 2018-01-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when traditional cement is used for curing, the water-cement ratio is often too large, and the cured body is not dense enough; the resin inclusion capacity is small, about 30%-40%, resulting in a relatively obvious expansion of the cured body; the heat of hydration is not conducive to large-volume pouring The cured body and the borate ions adsorbed in the resin have a retarding effect on the cement, causing problems such as delamination between the resin and the cement slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 375g alkali slag, 100g zeolite powder, 25g silica fume, 190g water, 300g boron-containing waste resin, 25g sodium silicate water glass, 3.5g polycarboxylate water reducer, and then prepare the solidified body according to the following steps:

[0020] (1) mixing alkali slag, zeolite powder and silica fume evenly to make a mixed material;

[0021] (2) Stir the above mixed material and water in a mixer for 90s, then pour boron-containing waste resin and stir for 90s, then add water glass and stir for 180s, and finally add polycarboxylate water reducer and stir for 90s to prepare a mixed slurry;

[0022] (3) Transfer the above-mentioned slurry to a φ50mm mold and form it compactly, and cure it in a curing box for 28 days at a curing temperature of 25°C and a relative humidity of ≧90%.

[0023] GB / T1346-2011 was used to measure the setting time of the mixed slurry. The initial setting time of the mixed slurry was 120min, the final setting time was 140min, and the flui...

Embodiment 2

[0026] Weigh 400g alkali slag, 75g zeolite powder, 25g silica fume, 200g water, 325g boron-containing waste resin, 35g water glass, 3.5g polycarboxylate water reducer, and then prepare the solidified body according to the following steps:

[0027] (1) mixing alkali slag, zeolite powder and silica fume evenly to make a mixed material;

[0028] (2) Stir the above mixed material and water in a mixer for 90s, then pour boron-containing waste resin and stir for 90s, then add water glass and stir for 180s, and finally add polycarboxylate water reducer and stir for 90s to prepare a mixed slurry;

[0029] (3) Transfer the above-mentioned slurry to a φ50mm mold and form it compactly, and cure it in a curing box for 28 days at a curing temperature of 25°C and a relative humidity of ≧90%.

[0030] GB / T1346-2011 was used to measure the setting time of the mixed slurry. The initial setting time of the mixed slurry was 108 minutes, the final setting time was 136 minutes, and the fluidity wa...

Embodiment 3

[0033] Weigh 325g alkali slag, 125g zeolite powder, 50g silica fume, 210g water, 325g boron-containing waste resin, 30g sodium silicate water glass, 5g polycarboxylate water reducer, and then prepare the solidified body according to the following steps:

[0034] (1) mixing alkali slag, zeolite powder and silica fume evenly to make a mixed material;

[0035] (2) Stir the above mixed material and water in a mixer for 90s, then pour boron-containing waste resin and stir for 90s, then add water glass and stir for 180s, and finally add polycarboxylate water reducer and stir for 90s to prepare a mixed slurry;

[0036] (3) Transfer the above-mentioned slurry to a φ50mm mold and form it compactly, and cure it in a curing box for 28 days at a curing temperature of 25°C and a relative humidity of ≧90%.

[0037] GB / T1346-2011 was used to measure the setting time of the mixed slurry. The initial setting time of the mixed slurry was 136min, the final setting time was 158min, and the fluidi...

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Abstract

The invention relates to an alkaline slag cement solidification method for boron-containing waste resin of nuclear power plant. The alkaline slag cement solidification method comprises: uniformly mixing alkaline slag, zeolite powder and silica fume to prepare a mixed material; then stirring the mixed material with water in a stirrer; then pouring the boron-containing waste resin and stirring the mixture for 30-120 seconds, then adding water glass to be stirred, and finally adding a polycarboxylate superplasticizer to prepare mixed slurry; and then pouring the mixed slurry into a solidification container. The alkaline slag cement solidification method provided by the invention has the beneficial effects that (1) the resin loading capacity is obviously increased, and when the resin loading capacity is 65%, performance requirements specified by the national standard GB14569.1-2011 can be still satisfied; (2) the setting time of the mixed slurry is adjustable, so that delayed coagulation of the mixed slurry caused by borate can be effectively avoided; and (3) the hydrating heat release of the solidification body is small, no cracks are generated on the surface of the curing body, the leaching resistance of nuclide ions is good, and the mixed slurry is good in flowing property, so that the requirement of large-size solidification can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste cement solidification, and in particular relates to a method for solidifying alkali slag cement of nuclear power plant boron-containing waste resin. Background technique [0002] With the rapid development of nuclear power technology, the problem of energy shortage in some parts of our country has also been effectively improved, but it is the development of these nuclear power plants that has caused a large amount of nuclear waste in our country. At present, cement curing is considered as an economical and effective curing method by countries all over the world. However, when traditional cement is used for curing, the water-cement ratio is often too large, and the cured body is not dense enough; the resin inclusion capacity is small, about 30%-40%, resulting in a relatively obvious expansion of the cured body; the heat of hydration is not conducive to large-volume pouring The cured body...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/20
CPCY02W30/91
Inventor 李相国王冠东马保国徐朋辉何超蒋文广
Owner WUHAN UNIV OF TECH
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