Use of attapulgite in soil heavy metal pollution restoration agent

A technology of pollution remediation and attapulgite is applied in the field of remediation of heavy metal polluted soil, which can solve the problems of weak non-metallic mineral processing industry foundation, low level of development and utilization, waste of resources, etc. The effect of improving the proportion, activity and adsorption performance of heavy metals

Inactive Publication Date: 2015-07-15
LANZHOU JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country has a large resource reserve of attapulgite, due to its late discovery, its development and utilization level is low, and the foundation of the national non-metallic mineral processing industry is relatively weak, and the attapulgite products that can be produced are still relatively low compared with other countries. Quite few, so that the application of this economically significant mineral deposit is limited to general fillers, and even exported cheaply in the form of raw soil, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In this embodiment, an attapulgite is used as a soil heavy metal pollution remediation agent, and the attapulgite is prepared by the following steps:

[0015] (1) Raw ore treatment: crush the red attapulgite ore from Linze, Gansu;

[0016] (2) Acidification treatment: slowly add 2mol / L dilute sulfuric acid to the attapulgite ore for acidification treatment, and activate 4h after the acidification treatment;

[0017] (3) Drying and screening: Transport the acidified attapulgite clay to a cement site to dry until the moisture content is less than 14%, then smash, and screen with a vibrating sieve to screen out attapulgite powder with a particle size of 120 mesh;

[0018] (4) Roasting and packaging: the sieved powder is put into a roasting furnace for roasting, the roasting temperature is controlled at 300°C, and the roasting time is controlled at 0.5 hours; the cooling package is the finished product of the attapulgite-based soil heavy metal pollution remediation agent.

[0019] Af...

Embodiment 2

[0021] In this embodiment, an attapulgite is used as a soil heavy metal pollution remediation agent, and the attapulgite is prepared by the following steps:

[0022] (1) Raw ore processing: crushing attapulgite ore;

[0023] (2) Acidification treatment: slowly add 2mol / L dilute sulfuric acid to the attapulgite ore for acidification treatment, and activate 3h after the acidification treatment;

[0024] (3) Drying and screening: The acidified attapulgite clay is transported to a cement site to dry until the moisture content is less than 14%, then crushed, and sieved with a vibrating screen, and the attapulgite powder is sieved with a particle size of 150 mesh;

[0025] (4) Roasting and packaging: the sieved powder is fed into the roasting furnace for roasting, the roasting temperature is controlled at 360°C, and the roasting time is controlled at 1 hour; the cooling package is the finished product of the attapulgite-based soil heavy metal pollution remediation agent.

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Abstract

The invention discloses a use of attapulgite in a soil heavy metal pollution restoration agent. A preparation method of the attapulgite-based soil heavy metal pollution restoration agent comprises the following steps of 1, raw ore treatment: crushing attapulgite ore, 2, acidification treatment: slowly adding 2mol/L of dilute sulphuric acid into the attapulgite ore, carrying out acidification treatment and then carrying out activation, 3, drying in the sun and screening: transporting the acidified attapulgite clay to a cement place, carrying out drying in the sun until water content is less than 14%, carrying out crushing and carrying out screening by a vibrating screen, and 4, roasting and packaging: inputting the screened powder into a roasting furnace, carrying out roasting and carrying out cooling and packaging so that the attapulgite-based soil heavy metal pollution restoration agent is prepared. The attapulgite clay subjected to sulfuric acid acidification has the characteristics of large specific surface area and high amount of porosity, has high activity and adsorptivity, can reduce a ratio of liquid heavy metal in the soil and realizes soil heavy metal passivation and heavy metal-polluted soil restoration.

Description

Technical field [0001] The invention belongs to the technical field of remediation of heavy metal contaminated soil, and in particular relates to the use of an attapulgite as a remediation agent for soil heavy metal pollution. Background technique [0002] At present, soil heavy metal pollution control methods are mainly divided into engineering remediation and bioremediation. Each method has certain advantages and disadvantages. Remediation of heavy metal contaminated soil by engineering has the advantages of thoroughness and stability, but the large amount of engineering and the high cost of treatment can easily lead to weakening of soil fertility. Bioremediation measures are simpler to implement, less investment, and less disturbing to the environment, but the governance efficiency is low. The main manifestation is that the hyperaccumulative plants that have been used in production are usually short, low biomass, slow growth and long cycle, and it is difficult to achieve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08B09C1/08B01J20/12B01J20/30C09K101/00
Inventor 陶玲任珺郝建秀许丹高洋
Owner LANZHOU JIAOTONG UNIV
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