Repairing agent for treating alkaline cadmium-contaminated soil and preparation method thereof

A technology of cadmium-contaminated soil and remediation agent, applied in the direction of soil conditioning materials, chemical instruments and methods, applications, etc., can solve the problems of unstable source of raw materials, complex composition of raw materials, high cost, etc., and achieve low repair cost and controllable quality The effect of strong stability and high quality stability

Inactive Publication Date: 2018-11-09
环保桥(湖南)生态环境工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The composition of raw materials is complex and unstable. Some products have as many as 8 kinds of raw materials, and the source of some raw materials is unstable, so it is not easy to promote and use
2. The cost is high. Some products use biochar as the main raw material, and the application rate per mu is as high as 1 ton, which is equivalent to more than 10,000 yuan per mu of repair cost, which loses the value of large-scale promotion
3. The coupling repair effect of soil-agricultural products is not considered. In the prior art, almost all of them only consider the passivation effect of cadmium in farmland soil, and do not consider the effect of repair agents on the transfer of cadmium in crop plants, so it is not very good. achieve the goal of safe utilization of heavy metal-contaminated cultivated land
4. When repairing cadmium-contaminated soil, it may aggravate soil salinization. Some existing product formulas use a large proportion of quicklime, resulting in a pH of 10-12, while most of the soil in the north is originally at a certain level. The salinization of the soil, the application of a strong alkaline repair agent will increase the salinization of the soil, which is not conducive to the growth of crops

Method used

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  • Repairing agent for treating alkaline cadmium-contaminated soil and preparation method thereof
  • Repairing agent for treating alkaline cadmium-contaminated soil and preparation method thereof
  • Repairing agent for treating alkaline cadmium-contaminated soil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: a kind of remediation agent that is used to control alkaline cadmium polluted soil, it is made of following 5 kinds of raw materials of weight percent:

[0035]

[0036]

[0037] A repairing agent for controlling alkaline cadmium-contaminated soil, the preparation method of which is:

[0038] (1) Prepare the premix: send the four raw materials of blast furnace slag, sepiolite, bentonite and desulfurized gypsum into the dry powder mixer through the extractor in proportion, and stir for 15 minutes to obtain the premix;

[0039] (2) Mixing of the finished product: add fulvic acid in proportion to the premix, and stir for 5 minutes to obtain the finished product - a repairing agent for treating alkaline cadmium-contaminated soil.

Embodiment 2- Embodiment 7

[0040] Embodiment 2-embodiment 7: a kind of repairing agent that is used to control alkaline cadmium polluted soil, it is made of following 5 kinds of raw materials of weight percent, and the raw material composition and content of each example are as follows:

[0041] Example

2

3

4

5

6

7

blast furnace slag

30％

50％

40％

40％

40％

45％

meerschaum

30％

20％

20％

30％

25％

20％

Bentonite

20％

10％

20％

15％

17％

20％

Desulfurization gypsum

18％

12％

15％

10％

13％

10％

Fulvic acid

2％

8％

5％

5％

5％

5％

[0042] Its preparation steps are identical with embodiment 1.

[0043] The comprehensive technical indicators of the powdery restorative agent obtained in Examples 1-7 were tested, and the results are shown in Table 1.

[0044] The comprehensive technical index of the restorative agent that table 1 embodiment 1-7 makes

[0045]

[0046] Note: effe...

Embodiment 8

[0047] Example 8: Pilot test of cadmium-contaminated cultivated land restoration in Baiyin City, Gansu Province (planting corn)

[0048] From May 2017 to September 2017, a field test of restoration agent application was carried out in Luojiatan Village, Wangxian Town, Baiyin District, Baiyin City, Gansu Province. The total cadmium in the test soil is 65.2mg / kg, the available cadmium is 19.6mg / kg, pH: 8.23 ​​(the test method for soil pH is NY / T 1121.2-2006, the same below). The corn variety planted was Jinsui No. 1.

[0049] A. Test treatment

[0050] In the field experiment, 2 treatments were set up, and each treatment was repeated 3 times. Each field had an area of ​​2 mu, and a 2.5-meter-wide protective row was set up around the test field.

[0051] Treatment 1: blank (CK), conventional fertilization, without any conditioner;

[0052] Treatment 2: conventional fertilization + 200 kg / mu of restoration agent prepared in Example 1.

[0053] B. Application method

[0054] O...

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Abstract

The invention relates to the technical field of agricultural environment conservation and restoration, in particular to a repairing agent for treating alkaline cadmium-contaminated soil and a preparation method thereof. The preparation method comprises the following steps: weighing blast furnace slag, sepiolite, bentonite and flue gas desulfurization gypsum in proportion, uniformly mixing, addingfulvic acid, and mixing to obtain the repairing agent. The preparation method of the invention has the following advantages: the raw materials are easily available; the operation is simple; the preparation cost of the repairing agent can be controlled within 800 yuan/ton, the dosage per acre is 100-300 kg, the cost of the repairing agent per acre is only 80-240 yuan, and the repairing agent can bewidely promoted and used at large scale. By the principle of multi-dimensional repairing, the activity of cadmium in soil can be reduced through sedimentation, adsorption and complexation, and the upward transfer of cadmium in crops can be inhibited through deposition on the endodermis and formation of -SH (sulfhydryl). The two-pronged approach makes it possible to effectively reduce the contentof cadmium in agricultural products.

Description

technical field [0001] The invention relates to the technical field of agricultural environment conservation and restoration, in particular to a restoration agent for treating alkaline cadmium-contaminated soil and a preparation method thereof. Background technique [0002] In the chemical treatment technology of heavy metal pollution in soil, the in-situ chemical passivation repair technology of passivating heavy metals in soil by applying soil remediation agent has been widely valued for its simplicity, good effect, economical and practical advantages, especially suitable for remediation of large Moderately and slightly polluted farmland soil. At present, there have been a lot of researches on remediation agents for acidic cadmium-contaminated soil, and many products have come out. The raw materials used are mainly alkaline materials, phosphorus-containing materials, clay minerals, iron-manganese oxides and organic materials. However, there is a lack of research on remedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00C09K109/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 唐守寅袁海伟熊琪胡露寻佳佳雷超
Owner 环保桥(湖南)生态环境工程股份有限公司
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