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Compacted bentonite sample and preparation method

A technology of bentonite and pressure equipment, which is applied in the field of compacted bentonite samples and preparation, can solve the problems of uniform water mixing, limited range of compactness, difficulty, etc., and achieves increasing non-uniformity coefficient, delaying expansion time, and environmental protection of materials. Effect

Active Publication Date: 2019-06-18
宜昌鸿乾环保建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Bentonite will swell rapidly when water is added to the optimal moisture content, and it is difficult to restore to the initial compact state through mechanical compaction, and it is difficult for water to mix evenly with bentonite in a short time
[0009] 2. Bentonite is very fluffy in a dry state, with extremely fine particles and poor gradation, and the range of increasing the compactness by mechanical force is limited
Especially when high-compacted bentonite samples are required, it is more difficult to achieve the predetermined target value only through the above measures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A compacted bentonite sample. The bentonite is coated with a coating dispersion liquid, and then the coated bentonite is compacted with a pressure device according to a predetermined dry density according to the optimal water content, and the compacted bentonite is dried. A compacted bentonite sample was obtained. Such as figure 2 Among them, the use of coated bentonite can delay the interaction time between water and bentonite, and control the swelling of bentonite samples before the test officially starts.

[0040] In a preferred solution, the component of the coating dispersion liquid is ethyl cellulose dissolved in ethanol, wherein the content of ethanol is 20%-40% by weight. Preferably, the volume concentration of ethanol in this example is more than 75%, and further preferred ethanol is absolute ethanol. In a preferred solution, the coating thickness is controlled by adjusting the ethanol content. When the ethanol content is higher, the envelope thickness is t...

Embodiment 2

[0057] 1. Take an appropriate amount of bentonite and spread it in a tray with a thickness of 1cm, and place it in an oven at 105°C for 12 hours. After drying, take 160g of bentonite and place it in the material tank of the fluidized bed.

[0058]2. Add 32g of ethyl cellulose into the reaction vessel, and slowly add 8g of ethanol solution. Stir well with a glass rod to obtain an ethyl cellulose dispersion, and pour the ethyl cellulose dispersion into a binder preparation tank in a fluidized bed spray system.

[0059] 3. Preheating the fluidized bed with an empty machine. There are two main purposes of the empty machine preheating: the initial air intake of the fluidized bed is generally unstable, and the equipment can be guaranteed after a certain period of time through the empty machine preheating. This parameter tends to be stable, so as to avoid the adverse effect of parameter instability on subsequent material preheating; secondly, through machine preheating, the material ...

Embodiment 3

[0068] 1. Take an appropriate amount of bentonite and spread it in a tray with a thickness of 1cm, and place it in an oven at 105°C for 12 hours. After drying, take 160g of bentonite and place it in the material tank of the fluidized bed.

[0069] 2. Add 24g of ethyl cellulose into the reaction vessel, and slowly add 16g of ethanol solution. and fully stirred with a glass rod to obtain an ethyl cellulose dispersion, and pour the ethyl cellulose dispersion into a binder preparation tank in a fluidized bed spray system.

[0070] 3. Preheat the fluidized bed with empty machine. There are two main purposes of empty machine preheating: First, the initial air intake of the fluidized bed is generally unstable. It can ensure that the parameter tends to be stable, and avoid the adverse effect of parameter instability on subsequent material preheating; second, through machine preheating, it can greatly reduce the material preheating time and improve efficiency.

[0071] 4. Preheating t...

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Abstract

The invention discloses a compacted bentonite sample and a manufacturing method. Bentonite is coated with a coating dispersion liquid; the coated bentonite is compacted with pressure equipment based on the pre-set dry density according to an optimum moisture content; and the compacted bentonite is dried to obtain the compacted bentonite sample. The manufacturing method comprises the following steps: drying bentonite and putting the dried bentonite in a material container of a fluidized bed; preparing a coating dispersion liquid and pouring the coating dispersion liquid in an adhesive preparation tank of a spray system of the fluidized bed; air-conveying bentonite through the fluidized bed at different air quantity and atomizing and spraying the coating dispersion liquid to coat bentonite; and performing mixing to the coated bentonite till the optimum moisture content is achieved, and performing compaction and drying to obtain the compacted bentonite sample. Through delaying the action time of water and bentonite, the expansion time of bentonite is obviously delayed and can be regulated through adjusting the thickness of a coating. Through control of the particle size of the coated bentonite, the compaction degree of bentonite is increased.

Description

technical field [0001] The invention relates to the field of geotechnical tests, in particular to a compacted bentonite sample and a preparation method aiming at a larger dry density. Background technique [0002] At present, most of the world believe that deep geological disposal using the concept of multiple barriers is the most feasible method to solve the problem of high-level radioactive waste. According to the experience of advanced nuclear energy countries, deep geological disposal mainly relies on buffer materials as the last artificial barrier. The buffer layer should have sufficient mechanical strength and good ductility to play its role in supporting high-level radioactive waste containers and solidified bodies, equalizing surrounding rock pressure, sealing surrounding rock cracks, and preventing mechanical damage to high-level radioactive waste solidified bodies and waste containers, etc. effect. [0003] my country has basically selected bentonite as the raw m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 谈云志吴军汪洪星明华军左清军孙文静
Owner 宜昌鸿乾环保建材有限公司
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