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Soil heavy metal ion adsorbing and separating material and preparation method thereof

A heavy metal collector and composite material technology, applied in the application field of inorganic mineral materials, can solve problems such as adsorption, and achieve the effects of expanding specific surface area, wide absorption, and increasing binding capacity.

Inactive Publication Date: 2019-04-23
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a brand-new composite adsorption material prepared from clay minerals, which can absorb heavy metals in the soil and improve the nutritional structure of the soil, and can effectively solve the problems of heavy metals in the soil. Adsorption and recovery issues

Method used

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  • Soil heavy metal ion adsorbing and separating material and preparation method thereof
  • Soil heavy metal ion adsorbing and separating material and preparation method thereof
  • Soil heavy metal ion adsorbing and separating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Purification of attapulgite

[0039] Take 5kg of attapulgite raw ore, break it into particles of about 10cm, add water 10 times its mass, add 50g of sodium hexametaphosphate, heat in a water bath at 60°C, stir for 30 minutes, and centrifugally filter the dispersed attapulgite slurry for later use .

[0040] 2. Surface activation of attapulgite

[0041] Add 1000ml of hydrochloric acid with a mass concentration of 10wt% to the filtered attapulgite, stir for 30 minutes, disperse ultrasonically for 5 minutes, then centrifuge at 200 rpm for 3 minutes, wash and dry the obtained wet solid to obtain solid powder, pass through an 80-mesh sieve for use .

[0042] 3. Material preforming

[0043] Mix 80 parts of activated and sieved attapulgite clay, 10 parts of DTCR, 3 parts of sodium bicarbonate, 3 parts of calcium silicate, and 4 parts of sodium-based concrete sealing and curing agent. , and then dry in the shade to a moisture content of 15%.

[0044] 4. Forming of rod-s...

Embodiment 2

[0047] 1. Purification of attapulgite

[0048] Take 5kg of attapulgite raw ore, break it into particles of about 10cm, add water 10 times its mass, add 50g of sodium hexametaphosphate, heat in a water bath at 60°C, stir for 30 minutes, and centrifugally filter the dispersed attapulgite slurry for later use .

[0049] 2. Surface modification of attapulgite

[0050] The purified attapulgite was reconfigured into an aqueous solution with a mass concentration of 5%, heated in a water bath at 80°C, stirred for 60 minutes, and the rotation speed was 500 rpm, and a modifier with a solid content of attapulgite of 1wt% was added. Alkyltrimethylammonium bromide was heated in a water bath at 80°C, stirred for 60 minutes at a speed of 500 rpm, and the obtained wet solid was washed and dried to obtain solid powder, which was passed through an 80-mesh sieve for use.

[0051] 3. Material preforming

[0052] Mix 80 parts of surface-modified attapulgite clay, 10 parts of DTCR, 3 parts of so...

Embodiment 3

[0056] 1. Purification of attapulgite and montmorillonite

[0057] 1. Purification of attapulgite

[0058] Take 5kg of attapulgite raw ore, break it into particles of about 10cm, add water 10 times its mass, add 50g of sodium hexametaphosphate, heat in a water bath at 60°C, stir for 30 minutes, and centrifugally filter the dispersed attapulgite slurry for later use .

[0059] Take 5kg of montmorillonite raw ore, break it into particles of about 10cm, add water 10 times its mass, add 50g of sodium hexametaphosphate, heat in a water bath at 60°C, stir for 30 minutes, and centrifugally filter the dispersed montmorillonite slurry for later use .

[0060] 2. Surface activation of attapulgite and montmorillonite

[0061] Add 1000ml of hydrochloric acid with a mass concentration of 10wt% into the filtered attapulgite, stir for 30 minutes, disperse ultrasonically for 5 minutes, then centrifuge at 200 rpm for 3 minutes, wash and dry the obtained wet solid to obtain solid powder, pas...

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Abstract

The invention discloses a compound material. The compound material is composed of natural clay minerals, heavy metal capturing agent, foaming agent, gelatinizing agent and curing agent. The inventionalso discloses a preparation method of the compound material. The preparation method of the compound material comprises crushing, purifying and surface-activating or modifying the natural clay minerals, and proportionally mixing the processed natural clay minerals with the heavy metal capturing agent, the foaming agent, the gelatinizing agent and the curing agent, then uniformly mixing in an appropriate amount of water, and placing the mixture into a forming die for compression forming. The compound material can adsorb heavy metal in soil, improve the nutrition structure of soil as well as soil hardening and accordingly effectively solve the problem of adsorption and recovery of heavy metal in soil.

Description

technical field [0001] The field to which the invention belongs is the application of inorganic mineral materials, specifically a method of using natural clay minerals to prepare a plug material for absorbing and separating heavy metal ion pollutants in soil and improving soil at the same time. Background technique [0002] Soil heavy metal pollution refers to the phenomenon that due to human activities, the content of trace metal elements in the soil exceeds the background value, resulting in the heavy metal content in the soil being significantly higher than the original content, and causing the deterioration of the ecological environment quality. The heavy metals that pollute the soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as zinc (Zn) and copper with certain toxicity. (Cu), nickel (Ni) and other elements. It mainly comes from pesticides, wastewater, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/16B09C1/00
CPCB01J20/10B01J20/12B01J20/165B09C1/00
Inventor 刘伟生王文杰王刚王莹窦伟唐晓亮张国林刘伟王星予
Owner LANZHOU UNIVERSITY
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