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Composite modifier for extremely-acidified mining wasteland soil and application of composite modifier

An amendment and wasteland technology, applied in the fields of application, soil conditioning materials, land preparation methods, etc., can solve the problems of poor soil active peptide minerals and incomplete soil improvement, so as to improve soil permeability, reduce toxicity, increase The effect of soil organic matter content

Inactive Publication Date: 2021-11-30
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The main purpose of the present invention is to provide a compound soil improver for extremely acidified abandoned mine land and its a

Method used

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  • Composite modifier for extremely-acidified mining wasteland soil and application of composite modifier
  • Composite modifier for extremely-acidified mining wasteland soil and application of composite modifier
  • Composite modifier for extremely-acidified mining wasteland soil and application of composite modifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Extremely acidic heavy metal-contaminated soil (with a pH value of 2.5-3.5 and an average pH value of 3.0) collected from a dump site belonging to polymetallic minerals such as lead-zinc mines, iron mines, and copper mines was transported to a local open-air nursery and used as a supply For the test soil, the physical and chemical property indexes of the test soil samples are shown in Table 1, and a kind of composite improver invented was added to carry out the soil matrix improvement test in the open air environment.

[0048] Table 1

[0049]

[0050] The composite improver comprises 12 parts by weight of slaked lime powder (300 meshes in particle size), active clay mineral powder (32 parts of attapulgite clay; 25 parts of sepiolite powder; 18 parts of active montmorillonite powder; particle size is 325 mesh), chicken dung rice 36 parts of shell decomposed fertilizer, 12 parts of biological bacteria organic material solid particles (from the manufacturer Beijing She...

Embodiment 2

[0057] The difference with Example 1 is: the composite improver includes 16 parts by weight of slaked lime powder (300 orders of particle size), active clay mineral powder (28 parts of attapulgite clay; 30 parts of sepiolite powder; 22 parts of active montmorillonite powder; particle size average 325 mesh), 40 parts of chicken manure, rice husk decomposed fertilizer, and 16 parts of biological bacteria organic material solid particles.

[0058]Compared with each index before the improvement of the test soil (the changes of each index before and after the pot test soil improvement are shown in Table 3, wherein the embodiment group is the index average value of the corresponding soil of four kinds of plant pots), the soil pH value has increased by 4.52 pH units , the net acid production potential NAG decreased by 42.90%; the contents of soil organic matter, available nitrogen, available phosphorus, and available potassium were 44.67, 3.96, 26.27, and 13.71 times the corresponding...

Embodiment 3

[0062] The difference with Example 1 is: the composite improver includes 12 parts by weight of slaked lime powder (300 orders of particle size), active clay mineral powder (15 parts of attapulgite clay; 40 parts of sepiolite powder; 35 parts of active montmorillonite powder; particle size average 325 mesh), 36 parts of chicken manure, rice husk decomposed fertilizer, and 12 parts of biological bacteria organic material solid particles.

[0063] Compared with each index before the improvement of the test soil (table 4 of each index change before and after the pot test soil improvement, wherein the embodiment group is the index average value of the corresponding soil of four kinds of plant pots), the soil pH value has increased by 3.33 pH units, The net acid production potential NAG decreased by 36.24%; the contents of soil organic matter, available nitrogen, available phosphorus, and available potassium were 42.29, 3.04, 10.34, and 8.91 times of the corresponding indexes of the ...

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Abstract

The invention provides a composite modifier for extremely-acidified mining wasteland soil and application of the composite modifier. The composite modifier comprises the following components in parts by weight: 5-20 parts of slaked lime powder, 50-110 parts of active clay mineral powder, 20-50 parts of an organic fertilizer and 10-20 parts of a biological bacterium organic material. The composite modifier can quickly remove acid and adjust the pH value of soil, can increase the content of organic matters in the soil, improves the permeability of the soil, reduces the content of effective states of composite heavy metals by using an active clay mineral functional material, reduces toxicity, continuously supplements medium trace elements such as silicon, calcium, magnesium, phosphorus and the like, makes the soil rich in active peptide minerals, decreases the proportion of acid-producing microorganisms and introduces probiotic microorganism active flora. Therefore, healthy soil can be comprehensively reconstructed, and the nutrient function, the structure function and the ecological environment function of the soil can be improved.

Description

technical field [0001] The invention relates to the technical field of soil improvement, in particular to a compound soil improver for extremely acidified abandoned mine land and its application. Background technique [0002] The abandoned land area of ​​non-ferrous metal mines in my country is as high as 2 million hectares, and there has been a lack of effective ecological restoration technology, especially in the southern part of my country, which is rich in metal mineral resources, and most of them are non-ferrous metal mines with various metal sulfides, such as pyrite and copper mines , lead-zinc mines, etc. In the process of metal mineral mining, open-pit mining plants, tailings areas, dumps, collapsed areas, and land that has lost economic value due to heavy metal pollution are in urgent need of ecological restoration. [0003] Sulfur-bearing minerals (mainly pyrite FeS 2 ) exposed to air, coupled with natural leaching, and air (mainly O 2 ) in full contact with water...

Claims

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Application Information

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IPC IPC(8): C05G3/80C05G3/00A01B79/00C09K17/40C09K101/00C09K109/00
CPCC05G3/80C05C11/00A01B79/00C09K17/40C05G3/00C09K2101/00C09K2109/00C05D3/02C05D5/00C05F3/00C05F5/002C05G1/00
Inventor 张建锋王志高谢金亮何新春刘慧芳朱柱王旭
Owner CHINA ENFI ENGINEERING CORPORATION
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