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Preparation method of modified mineral composition for heavy metal polluted soil improvement

A technology for improving contaminated soil and composition, which is applied in the field of preparation of modified mineral composition for improving heavy metal-contaminated soil, which can solve the problems of unsatisfactory removal of heavy metals and high cost of improving contaminated soil, so as to reduce bioavailability and mobility , improve water retention and air permeability, and promote plant growth

Active Publication Date: 2018-04-13
盱眙欧佰特粘土材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the technical problems of the high cost of improving contaminated soil and the unsatisfactory removal effect of heavy metals in the prior art, the inventors have completed the present invention after conducting a large number of in-depth studies.

Method used

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  • Preparation method of modified mineral composition for heavy metal polluted soil improvement

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] This example relates to a preparation method of a modified mineral composition for heavy metal polluted soil improvement, which consists of the following steps:

[0028] In step (1), attapulgite, vermiculite, sepiolite, zeolite, and diatomite are coarsely crushed respectively, and the five kinds of small particle minerals under the sieve (attapulgite: vermiculite: seafoam stone: zeolite: diatomaceous earth weight ratio is 6: 1: 1: 1: 1) mixed evenly to obtain mixed minerals, spray groundwater to the mixed minerals, so that the water weight content of the mixed minerals is 48%, and then use a three-roll machine Extruded into flake mineral composition (control flake thickness 5mm);

[0029] Step (2), stacking the flaky mineral combination for more than 48 hours, and then drying naturally until the water weight content is less than 20%;

[0030] In step (3), the sheet-shaped mineral composition with a water weight content of less than 20% is transported into a rotary kiln...

Embodiment 2

[0034] This example relates to a preparation method of a modified mineral composition for heavy metal polluted soil improvement, which consists of the following steps:

[0035] In step (1), attapulgite, vermiculite, sepiolite, zeolite, and diatomite are coarsely crushed respectively, and the 4cm aperture is rolled to sieve, and five kinds of small particle minerals under the sieve (attapulgite: vermiculite: seafoam Stone: zeolite: diatomaceous earth (8:1:1:1:1) mix evenly to obtain mixed minerals, spray groundwater to the mixed minerals so that the water weight content of the mixed minerals is 50%, and then use a three-roll machine to extrude into Flaky mineral composition (control sheet thickness 1mm);

[0036]Step (2), stacking the flaky mineral combination for more than 48 hours, and then drying naturally until the water weight content is less than 20%;

[0037] In step (3), the sheet-shaped mineral composition with a water weight content of less than 20% is transported in...

Embodiment 3

[0041] This example relates to a preparation method of a modified mineral composition for heavy metal polluted soil improvement, which consists of the following steps:

[0042] In step (1), attapulgite, vermiculite, sepiolite, zeolite, and diatomite are coarsely crushed respectively, and the 3 cm aperture is rolled to sieve, and the five kinds of small particle minerals under the sieve (attapulgite: vermiculite: seafoam stone: zeolite: diatomaceous earth weight ratio is 5: 2: 2: 2: 2) mixed evenly to obtain mixed minerals, spray groundwater to the mixed minerals, so that the water weight content of the mixed minerals is 40%, and then use a three-roll machine Extruded into flake mineral composition (control flake thickness 2mm);

[0043] Step (2), stacking the flaky mineral combination for more than 48 hours, and then drying naturally until the water weight content is less than 20%;

[0044] In step (3), the sheet-shaped mineral composition with a water weight content of less ...

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Abstract

The invention relates to a preparation method of a modification mineral composition for improving heavy metal polluted soil. The preparation method comprises the following steps: separately carrying out coarse crushing and roller screening on attapulgite, vermiculite, sepiolite, zeolite and diatomite, uniformly mixing the five screened small granular minerals to obtain a mineral mixture, spraying water onto the mineral mixture and extruding to obtain a flaky mineral composition; piling the flaky mineral composition up and drying in the sun naturally; roasting in a rotary kiln to obtain roasted mineral; compounding and mixing the roasted mineral with flyash and quick lime uniformly to obtain a mixture; and milling the mixture into powder to obtain the modification mineral composition. On one hand by virtue of adsorption and precipitation effects for heavy metals, the modifier composition provided by the invention is capable of changing the existence state of heavy metals in soil and reducing the bioavailability and mobility 0f heavy metals; on the other hand, by improving the soil structure, the modifier composition is capable of improving the water-retaining property and air permeability of soil, which is beneficial to promoting the growth of plants.

Description

technical field [0001] The invention relates to a preparation method of a polluted soil modifier composition, in particular to a preparation method of a modified mineral composition for heavy metal polluted soil improvement. Background technique [0002] Soil is a strategic resource for human survival and rejuvenation. With the rapid development of industrialization, urbanization, and agricultural intensification, a large amount of untreated waste is transferred to the soil system, and is collected and left in the soil environment under the action of natural factors. It is estimated that the soil area polluted by pesticides and heavy metals in my country has reached tens of millions of hectares, which has posed a serious threat to the quality of my country's ecological environment, food safety and sustainable social and economic development. The types of pollutants mainly include heavy metals, nitrates, pesticides and persistent organic pollutants, radionuclides, pathogenic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/08C09K101/00
CPCC09K17/08C09K2101/00
Inventor 梁丽芹沈培友杭小帅马国超曹一康
Owner 盱眙欧佰特粘土材料有限公司