Salt eluting method for surface layer soil of alkaline land

A technology for surface soil and saline-alkali land is applied in the field of rapidly restoring the planting capacity of saline-alkali soil, which can solve the problems of slow desalination, low production efficiency, and high cost of land improvement, and achieve the effects of rapid desalination, improving efficiency and speed, and restoring planting capacity.

Inactive Publication Date: 2008-10-29
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

This method only uses physical methods to dissolve and discharge salt in situ. The desalination speed is slow, the production efficiency is low, and the cost of land improvement is high.

Method used

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  • Salt eluting method for surface layer soil of alkaline land
  • Salt eluting method for surface layer soil of alkaline land
  • Salt eluting method for surface layer soil of alkaline land

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Embodiment

[0035] The existence of saline-alkali in soil can be roughly divided into four states: crystalline saline-alkali, solute salt in soil solution (existing in gravity water and pore water), saline-alkali ion3 adsorbed on the surface of soil particles, and in vivo in soil particles. Salt. It can be seen visually that the upper layer of saline-alkali soil is covered by a layer of white saline-alkali; under an optical microscope, it can be seen that the solid saline-alkali on the surface of saline-alkali soil exists in a crystalline structure in the soil (see Figure 4 ).

[0036] When eluting salt from topsoil, the crystalline salt and solute salt can be passed through the aqueous solution to make them enter the water (the solubility of saline alkali is generally greater than 30%), and then they are eluted together with the aqueous solution. Because the adsorbed water and film water are generally difficult to separate from the water-soil mixture, therefore, it is impossible to com...

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Abstract

The invention relates to a leaching and desalting method of the top soil of alkaline land; the method includes the following steps: (1) the top soil to be treated with leaching and desalting is stripped from the alkaline land; (2) the stripped soil is transferred to a special work place for leaching and desalting; (3) the stripped soil is put into a piece of comprehensive leaching and desalting equipment in the work place for leaching and desalting; (4) water with low salinity is added into the comprehensive leaching and desalting equipment for being mixed with the soil; (5) the comprehensive leaching and desalting equipment carries out soaking desalination and pumping filtration salt draining to the soil; (6) the soil treated with leaching and desalting is transferred back to the original land; (7) saline water generated in the leaching and desalting process is drained. By adopting the method, the top soil of alkaline land is stripped from the original site, and then the salt in the top soil is quickly eliminated by leaching, thus the planting capability of alkaline soil can be recovered quickly.

Description

technical field [0001] The invention relates to a method for eluting salt from the surface soil of saline-alkali soil, in particular to a method for stripping the surface soil of saline-alkali soil from its original position, quickly eluting and removing the salinity of the surface soil, and quickly restoring the planting capacity of the saline-alkali soil. Background technique [0002] There are large areas of saline-alkali land distributed in my country. There have been many studies on the salt removal of saline-alkali soil, especially the soil desalination research and experiments on surface soil. These studies mainly use engineering, biology, chemistry and physics. Salt discharge is carried out directly, while the recovery of soil planting capacity is mainly achieved through farmland water conservancy projects and supplemented by field planting management measures to achieve soil improvement, reduce surface soil salinity, and gradually achieve the effect of planting. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 王静爱于长水张峰张国明史培军顾卫
Owner BEIJING NORMAL UNIVERSITY
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