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Anti-layering saline-alkali soil improvement and improvement method

A saline-alkali soil improvement, saline-alkali soil technology, applied in chemical instruments and methods, soil conditioning materials, organic fertilizers, etc., can solve problems such as less research on saline-alkali geological improvement methods, achieve easy implementation, facilitate drainage and salt washing, and low production costs Effect

Inactive Publication Date: 2018-04-24
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that there are few effective and durable saline-alkali soil improvement methods in the prior art, and to provide an anti-stratification saline-alkali soil improvement agent and improvement method

Method used

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  • Anti-layering saline-alkali soil improvement and improvement method
  • Anti-layering saline-alkali soil improvement and improvement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Select iron tailings, then add polyacrylic acid with a molecular weight of 2000-5000, a solid content of 30%, and a 1% aqueous solution with a pH value of 3.0, stir evenly, adjust the pH of the iron tailings to 6.5, and obtain modified iron tailings.

[0038] Take soil samples from the plow layer (0-20cm) in the sandy clay loamy saline-alkali soil area to be improved, and analyze the mechanical composition after air drying (see Table 1). The soil bulk density is 1.32g / cm 3 .

[0039] Table 1. Mechanical composition of sandy clay loamy saline-alkali soil

[0040] Particle size classification

<0.002mm

0.002≤~<0.05mm

0.05≤~<2mm

content(%)

23.1

24.0

52.9

[0041] Select 30m in the area to be improved 2 In the plot, add modified iron tailings sand to the soil after leveling, and calculate according to formulas (1), (2) and (3), the addition amount is clay 0kg, silt 700kg, sand 0kg, and then mix with the plow layer soil (20cm depth...

Embodiment 2

[0048] Dewatered sludge with a water content of 80%±5 and a pH of 8.5±0.5 from a domestic sewage treatment plant was mixed evenly with corn stalk powder. After composting, decomposed sludge with a water content of 25.7% and a pH of 8.3 was obtained.

[0049] Take the plow layer soil (0-20cm) in the clay loamy saline-alkali soil area to be improved, and analyze the mechanical composition after air-drying (see Table 4). The soil bulk density is 1.41g / cm 3 .

[0050] Table 4. Mechanical composition of clay loamy saline-alkali soil

[0051] Particle size classification

<0.002mm

0.002≤~<0.05mm

0.05≤~<2mm

content(%)

28.2

42.3

29.5

[0052] Select 30m in the area to be improved 2 For the plot, add iron tailings sand to the soil after leveling, and calculate according to the formulas (1), (2) and (3), the addition amount is clay 0kg, silt 510kg, sand 420kg, and the plow layer (20cm depth) soil Stir evenly, then add 60kg of decomposed sludge...

Embodiment 3

[0059] Mix the residue obtained from anaerobic fermentation with cow dung as raw material in the biogas digester and straw at a C / N ratio of 25 to 35:1, and undergo static aerobic composting to obtain a decomposed material with a water content of 27.3% and a pH of 8.5. Biogas residue.

[0060] Take the plow layer soil (0-20cm) in the sandy loam saline-alkali soil area to be improved, and analyze the mechanical composition after air-drying (see Table 7). The soil bulk density is 1.30g / cm 3 .

[0061] Table 7. Mechanical composition of sandy loamy saline-alkali soil

[0062] Particle size classification

<0.002mm

0.002≤~<0.05mm

0.05≤~<2mm

content(%)

6.4

41.0

52.6

[0063] Select 30m in the sandy loamy saline-alkali soil area to be improved 2 In the plot, add iron tailings sand to the soil after leveling, and calculate according to formulas (1), (2) and (3). ) and stir evenly, then add 60kg of decomposed biogas residue, stir evenly wit...

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Abstract

The invention provides a saline-alkali soil improvement method and an improvement agent in order to solve the problem in the prior art that few effective and lasting studies are available on saline-alkaline land texture improvement methods, and belongs to the technical field of saline-alkali soil improvement. According to the improvement method provided by the invention, the to-be-improved saline-alkali soil is added with iron tailing sand which changes the proportion of sand, powder and clay particles in the saline-alkali soil and reasonably adjusts the texture composition so as to transformthe saline-alkali soil into loam; due to the irregular edge block structure of the iron tailing, a large number of capillary pores can be maintained while a lot of non-capillary pores and large crackscan be constructed, thereby not only improving the permeability to facilitate water drainage and salt leaching, but also hindering the rise of capillary water to reduce salt accumulation and effectively lower soil salinity; moreover, through the anti-layering improvement agent, compatibility between the iron tailing sand and natural soil is improved, the phenomenon of non-uniform settling and layering is avoided or reduced in a saline-alkali soil improvement process, a uniform-texture soil structure is formed, and lasting improvement of the saline-alkali soil and stability of the soil textureare realized.

Description

technical field [0001] The invention belongs to the technical field of saline-alkali soil improvement, in particular to an anti-stratification saline-alkali soil improvement agent and an improvement method. Background technique [0002] The area of ​​saline-alkali soil in my country is huge, and saline soil is distributed from the tropics to the cold temperate zone, from the coast to the inland, and from the lowland to the plateau. Saline-alkali soil is a general term for saline soil and alkaline soil and various salinized and alkaline soils. Among them, saline soil refers to the soil that contains a large amount of soluble salts and makes most plants unable to grow, and its salt content is generally more than 0.6%; alkaline soil refers to the soil whose substitution rate (ESP) of sodium ion cation substitution exceeds 20%. strong alkaline soil. The physical and chemical properties of saline soil are poor. The main performance is that the salinity or alkalinity is too high...

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 邵安林潘大伟高江郝忠庆
Owner ANSTEEL GRP MINING CO LTD
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