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Preparation method of composite stabilizer for treating heavy metal contaminated soil

A composite stabilizer and polluted soil technology, which is applied in the field of preparation of composite stabilizers, can solve the problems of reducing the bioavailability of heavy metals, the migration speed of heavy metals, reducing the total amount of heavy metals in soil, and affecting site use planning, so as to avoid soil salinization , strong operability and simple processing

Pending Publication Date: 2021-03-19
中节能大地(杭州)环境修复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, traditional curing / stabilization technologies mainly use curing agents such as cement and fly ash and inorganic salt stabilizers such as phosphate and sulfide; among them, curing agents such as cement and fly ash have a more significant effect on soil curing. However, it has a greater impact on the compatibilization of soil. For example, a compound heavy metal curing agent for treating polluted soil disclosed in Chinese patent (patent No. ZL201410737402.X) and its preparation method, the compounding amount of the compound heavy metal curing agent is 30- 35 wt%, which has a greater effect on soil expansion; while phosphate, sulfide, polyferric sulfate and other inorganic salt stabilizers have a higher repair efficiency, but excessive addition of inorganic salts will easily lead to soil salinization and affect the later use of the site planning
In addition, the solidification / stabilization technology does not reduce the total amount of heavy metals in the soil, but only temporarily reduces the bioavailability of heavy metals and slows down the migration speed of heavy metals. Over time, there is a risk of heavy metal pollution spreading

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method for a composite stabilizer for controlling heavy metal polluted soil, comprising the following steps:

[0030] (1) Dry bentonite at 80°C for 4 hours, and after cooling to room temperature, use a ball mill to grind for 0.2 hours to form stabilizer carrier powder;

[0031] (2) Weigh a certain amount of ferric chloride as an iron-based stabilizer, dissolve it in clean water, and prepare a 0.2 mol / L solution;

[0032] (3) The mass ratio of stabilizer solution to stabilizer carrier powder is 10:1, add the stabilizer carrier powder prepared in step (1) to the stabilizer solution prepared in step (2), and stir and react at 50°C for 4 h ;

[0033] (4) Separating the suspension prepared in step (3) from solid to liquid using a plate and frame filter press;

[0034] (5) Add clean water to the filter cake produced in step (4), stir and clean it, and perform solid-liquid separation again to form a composite stabilizer mud cake;

[0035] (6) Dry the mud cake ...

Embodiment 2

[0037] A preparation method for a composite stabilizer for controlling heavy metal polluted soil, comprising the following steps:

[0038] (1) Dry zeolite and biochar at 80°C for 4 h, and after cooling to room temperature, use a ball mill to grind for 0.4 h to form stabilizer carrier powder;

[0039] (2) Weigh a certain amount of polyferric sulfate as an iron-based stabilizer, dissolve it in clean water, and prepare a 0.4mol / L solution;

[0040] (3) The mass ratio of the stabilizer solution to the stabilizer carrier powder is 5:1, add the stabilizer carrier powder prepared in step (1) to the stabilizer solution prepared in step (2), and stir and react at 80°C for 2 h ;

[0041] (4) Separating the suspension prepared in step (3) from solid to liquid using a plate and frame filter press;

[0042] (5) Add clean water to the filter cake produced in step (4), stir and clean it, and perform solid-liquid separation again to form a composite stabilizer mud cake;

[0043] (6) Dry th...

Embodiment 3

[0045] A preparation method for a composite stabilizer for controlling heavy metal polluted soil, comprising the following steps:

[0046] (1) Dry the biochar at 80°C for 4 hours, and after cooling to room temperature, use a ball mill to grind it for 1 hour to form stabilizer carrier powder;

[0047] (2) Weigh a certain amount of polyferric sulfate and ferrous sulfate as iron-based stabilizers, dissolve them in clean water, and prepare a 1 mol / L solution;

[0048] (3) The mass ratio of the stabilizer solution to the stabilizer carrier powder is 2:1, the stabilizer carrier powder prepared in step (1) is added to the stabilizer solution prepared in step (2), and the reaction is stirred at 60°C for 6 h ;

[0049](4) Separating the suspension prepared in step (3) from solid to liquid using a plate and frame filter press;

[0050] (5) Add clean water to the filter cake produced in step (4), stir and clean it, and perform solid-liquid separation again to form a composite stabilize...

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PUM

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Abstract

The invention relates to a preparation method of a composite stabilizer for treating heavy metal contaminated soil, which comprises the steps of preparing stabilizer carrier powder from a stabilizer carrier, preparing a stabilizer solution from a certain amount of iron-based stabilizer or aluminum-based stabilizer, adding the stabilizer carrier powder into the stabilizer solution, stirring to react to obtain a turbid liquid, performing solid-liquid separation to obtain a composite stabilizer mud cake, drying and cooling to normal temperature, adding a certain amount of chemical stabilizer powder, and grinding by using a ball mill to obtain composite stabilizer powder. The agent is green, environmentally friendly, small in secondary pollution, short-term efficient, long-term effective, widein agent raw material source and easy to process.

Description

technical field [0001] The invention belongs to the technical field of regeneration of polluted soil, and in particular relates to a preparation method of a composite stabilizer for treating heavy metal polluted soil. Background technique [0002] Heavy metals are an important class of pollutants, mainly including zinc, lead, mercury, etc., which are widely used in electroplating, battery, chemical and other industries. Heavy metals have poor mobility in soil, long residence time, and have the characteristics of concealment, long-term, irreversible and non-degradable by microorganisms. [0003] Due to poor management during use and improper disposal after use, heavy metals widely exist in industrial legacy sites such as electronic waste dismantling, metallurgy, and electroplating, which will adversely affect the subsequent reuse and development of the site; while in the soil, when heavy metals accumulate to a certain extent , will not only lead to soil degradation, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08
CPCB09C1/00B09C1/08C09K17/40
Inventor 元妙新陈玲莉陈财丁占升陈欢
Owner 中节能大地(杭州)环境修复有限公司
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