Large-particle passivation material with montmorillonite as substrate and preparation method and application thereof

A particle material and montmorillonite technology, applied in the field of large particle passivation materials and preparation, can solve the problem of poor operability and safety of alkaline passivation materials, affecting material operability and construction cost, and endangering the personal safety of construction personnel, etc. problems, to overcome poor operability and safety, reduce ecotoxicity, and improve sustained-release performance

Pending Publication Date: 2022-02-25
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most passivation materials are still limited by two aspects in the application process: on the one hand, the operability and safety of alkaline passivation materials are poor
Among the current passivators, alkaline materials have the best application effect, among which slaked lime is the most widely used, but because most of the materials are small in particle size and in the form of fine powder, dust is easily generated during the spreading process, which strongly irritates human eyes and skin, and is harmful The personal safety of construction personnel seriously affects the operability and construction cost of the material
On the other hand, the acute ecotoxicity caused by the rapid release of alkaline passivation materials

Method used

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  • Large-particle passivation material with montmorillonite as substrate and preparation method and application thereof
  • Large-particle passivation material with montmorillonite as substrate and preparation method and application thereof
  • Large-particle passivation material with montmorillonite as substrate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Large montmorillonite particles, montmorillonite powder

[0036] making process:

[0037] 1. Large montmorillonite particles: Weigh 50 g of montmorillonite powder (purity ≥ 95%) in a centrifuge tube, add 50 g of water, and shake at 180 rpm at room temperature for 2 hours to fully mix the materials evenly. Dry the material in an oven at 75°C until the humidity is about 25%, put the viscous material into a syringe with a circular outlet diameter of 5mm, extrude it to obtain a strip of passivation material, and bake it at 350°C Dry to constant weight, then cut into cylindrical granular materials with a height of 5 mm and a cross-sectional diameter of 5 mm.

[0038] 2. Montmorillonite powder: montmorillonite powder with a purity ≥ 95%.

[0039] Application process:

[0040] 1. Material preparation: weigh 0.2g of each of the two materials, add Cd with a volume of 500mL and a concentration of 50mg / L 2+ Adsorption experiments were carried out in solution.

[0041] 2. Adso...

Embodiment 2

[0045] Comparison of cadmium passivation powder and particles at a mass ratio of 3:1

[0046] making process:

[0047] 1. Montmorillonite: Calcium Hydroxide = 3:1 large particles: Weigh 37.5g of montmorillonite powder (purity ≥ 95%) and 12.5g of calcium hydroxide powder (purity ≥ 95%) in a centrifuge tube, add 50g of water , shake at 180rpm at room temperature for 2 hours, so that the materials are fully mixed and even. Subsequent preparation process is with embodiment 1, as figure 1 shown.

[0048] 2. Montmorillonite: Calcium Hydroxide=3:1 powder: Take montmorillonite powder (purity ≥ 95%) 37.5g and calcium hydroxide powder (purity ≥ 95%) 12.5g in a centrifuge tube, at 180rpm rotating speed , Shake at room temperature for 2 hours, so that the materials are fully mixed, and can be taken directly for subsequent use.

[0049] Application process: with embodiment 1. Test pH results see Figure 4 , sample Cd concentration see Figure 5 . The test results show that after ad...

Embodiment 3

[0051] making process:

[0052] 1. Montmorillonite: Calcium Hydroxide = 2:1 large particles: Weigh 33.33g of montmorillonite powder (purity ≥ 95%) and 16.67g of calcium hydroxide powder (purity ≥ 95%) in a centrifuge tube, add 50g of water , shake at 180rpm at room temperature for 2 hours, so that the materials are fully mixed and even. Subsequent preparation process is the same as in Example 1.

[0053] 2. Montmorillonite: Calcium Hydroxide=2:1 powder: Take by weighing montmorillonite powder (purity ≥ 95%) 33.33g and calcium hydroxide powder (purity ≥ 95%) 16.67g in centrifuge tube, at 180rpm rotating speed , Shake at room temperature for 2 hours, so that the materials are fully mixed, and can be taken directly for subsequent use.

[0054] Application process: with embodiment 1. Test pH results see Figure 6 , sample Cd concentration see Figure 7 . The test results show that after adding montmorillonite: calcium hydroxide=2:1 large particle and montmorillonite: calcium...

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Abstract

The invention discloses a large-particle passivation material with montmorillonite as a substrate and a preparation method and application thereof. The preparation method comprises the following steps that montmorillonite and calcium hydroxide powder are placed in a reaction container according to the proportion, water with the same mass is added, the humidity of a mixture is kept to be 100%, and the mixture is oscillated, stirred and evenly dispersed at the room temperature; the obtained product is placed in an oven to be baked and then placed in a pressurizer, and a cylindrical passivation material is prepared; and the cylindrical passivation material is dried and shrunk at a high temperature, and finally the cylindrical passivation material is cut into the large-particle passivation material. According to the invention, the powdery passivation material is uniformly dispersed and cross-linked by utilizing the strong adsorption force and viscosity of the montmorillonite after absorbing water and expanding, and then the powdery material is further tightly fixed by utilizing the volume shrinkage characteristic of the montmorillonite after high-temperature dehydration, so that the powdery material becomes a large-particle material, dust is not raised when the powdery material is spread, and the operability and the safety are improved. The slow release performance of the passivation material for releasing hydroxyl ions is improved, the ecological toxicity is reduced, and the passivation effect of the passivation material on cadmium is not affected after modification.

Description

technical field [0001] The invention relates to the technical field of cadmium pollution restoration materials, in particular to a large particle passivation material based on montmorillonite, a preparation method and an application thereof. Background technique [0002] The 2014 "National Soil Pollution Survey Bulletin" shows that the rate of soil points exceeding the standard in my country is 16.1%, and the problem of cadmium exceeding the standard is the most serious, with the rate of point exceeding the standard reaching 7%. Cadmium is the primary pollutant to be controlled in farmland, whether it is in the Southwest and Central South regions, or in the Yangtze River Delta, Pearl River Delta, Liaoning and Northwest regions. Cadmium pollution in farmland has led to frequent incidents such as "cadmium rice" and "heavy metal vegetables", which directly threaten the quality and safety of agricultural products in my country and the sustainable development of agriculture. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K17/06B09C1/08C09K109/00
CPCC09K17/08C09K17/06B09C1/08C09K2109/00
Inventor 黄高翔黄柯依任雯靖丁明军
Owner JIANGXI NORMAL UNIV
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