Soil surface crust breaking agent for magnesite region and application

A technology of soil surface and cracking agent, which is applied in application, soil conditioning materials, restoration of polluted soil, etc. It can solve the problems of increased pollution, economic loss, and soil quality decline, so as to increase nutrient absorption and control the environment conditions, operation is convenient and easy to do

Inactive Publication Date: 2016-01-20
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium-polluted soil quality declines, crops decrease, the degree of pollution intensifies, and plant species gradually decrease. Plants in severely polluted areas can hardly survive, and only a small number of shrubs and young pine trees survive, causing huge economic losses to agricultural production.

Method used

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  • Soil surface crust breaking agent for magnesite region and application
  • Soil surface crust breaking agent for magnesite region and application
  • Soil surface crust breaking agent for magnesite region and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The experimental site is located in the Shenyang Ecological Station of the Chinese Academy of Sciences. The method of artificially filling the soil column is used for the infiltration experiment. The soil is collected from Bali Town, Haicheng City. Physical and chemical properties of the tested soil: pH 8.36, organic matter 6.7g / kg, total magnesium content 18.07g / kg, clay 39.2%, silt 41.6%, gravel 19.3%, water-soluble magnesium 33.53%, water-soluble calcium 25.86 %, exchanged magnesium 1.77%, exchanged calcium 1.29%. The collected soil was air-dried indoors, and after a week, it was ground with a mortar to make it pass through a 2mm sieve for later use.

[0025] Application of soil amendments:

[0026] Control group: weigh 505g of spare soil and put it into a plexiglass column with an inner diameter of 5cm as a control, and the filling height is about 25cm, so that the soil bulk density is about 1.15gcm -3 .

[0027] Test group: Weigh 400g of soil and place it in a s...

Embodiment 2

[0034] The physical and chemical properties of the tested soil and the filling of the soil column are the same as in Example 1, except that:

[0035] Test group: Weigh 400g of soil and place it in the soil column, sprinkle 100g of soil, 5g of magnesium oxide powder, and 4g of citric acid on the surface of the soil column, mix evenly, and sprinkle on the surface of the soil in the soil column. The conditions of the infiltration experiment and the method of alternating wet and dry are the same as in Example 1. After the first rinsing for 10 minutes, the penetration rate is greater than 0.676mlmin -1 , the second leaching reaches a stable permeation rate of 0.454mlmin -1 (>0.382mlmin -1 , image 3 ), after two times of alternating wet and dry, the third wash reaches a stable penetration rate of 0.764mlmin -1 (>0.677mlmin -1 , image 3 ). By comparing the results, the penetration rate has been improved. With the alternation of drying and wetting, citric acid can alleviate an...

Embodiment 3

[0037] The physical and chemical properties of the tested soil and the filling of the soil column are the same as in Example 1, except that:

[0038] Test group: Weigh 400g of soil and place it in the soil column, sprinkle 100g of soil, 5g of magnesium oxide powder, and 5g of citric acid on the surface of the soil column, mix evenly, and sprinkle on the surface of the soil in the soil column. The conditions of the infiltration experiment and the method of alternating wet and dry are the same as in Example 1. By rinsing four times and alternating wet and dry three times, the permeation rate increases by 11% compared to Example 1 ( Figure 5 ).

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Abstract

The invention relates to the technical field of polluted soil improvement and recovery, in particular to a soil surface crust breaking agent for a magnesite region and application. The crust breaking agent is organic acid shown in the first formula. It can be seen that citric acid has a good crust breaking effect on soil crusts; particularly, citric acid is natural micromolecular organic acid, a complex is formed through citric acid and metal ions to promote the desorption of the metal ions, and the activity of the metal ions is increased; meanwhile, acid organic matter can promote the soil granular structure, and salt and alkali are effectively relieved. The first formula can be seen in the specification.

Description

technical field [0001] The invention relates to the technical field of improvement and restoration of polluted soil, in particular to a soil surface crust breaking agent in a magnesite mining area and its application. Background technique [0002] The reserves and output of magnesite in Liaoning rank first in China and in the world. The development and utilization of mineral resources provides human beings with various materials and energy, but also brings many environmental problems. Soil pollution is a prominent problem in mining activities. According to data, the Pidgeon method produces a large amount of waste residue, about 6.5 tons of magnesium reduction residue per ton. It is estimated that 10,000 tons of waste residue covers an area of ​​about 1 mu. In 2001, China produced 216,000 tons of magnesium, occupying 140 mu of land. Hard and compact crusts are often seen on the soil surface around the magnesite mine area, and the thickest crusts can reach 10cm in severe are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/14B09C1/08C09K109/00
Inventor 贾春云方玥蒙李晓军台培东刘宛
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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