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Soda type saline-alkali soil improver and improvement method

A technology of improving and improving agent for saline-alkali soil, applied in the fields of land preparation methods, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of soda saline-alkali soil without good improvement means, high content of bicarbonate ions, large carbonate ions, etc. , to achieve the effect of obvious improvement effect, low price and low production cost

Active Publication Date: 2020-12-29
ANSTEEL GRP MINING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that there is no good improvement method for soda saline-alkali soil, and to provide a soda-type saline-alkali soil improver and improvement method
The invention uses acidified modified steel slag as soda saline-alkaline soil modifier to solve the problems of excessively harmful carbonate ion and bicarbonate ion content and ion composition imbalance in soda saline-alkali soil

Method used

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  • Soda type saline-alkali soil improver and improvement method
  • Soda type saline-alkali soil improver and improvement method
  • Soda type saline-alkali soil improver and improvement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The steel slag obtained after magnetic separation by Anshan Iron and Steel Group Slag Company was used as raw material and passed through a 100-mesh sieve. The contents of its main chemical components are shown in Table 1.

[0043] Table 1 Determination results of the main chemical components of steel slag for testing (%)

[0044] index SiO 2

Al 2 o 3

TFe(Fe 2 o 3 )

CaO MgO steel slag 14.45 3.71 10.21 42.12 6.54

[0045] The preparation method is as follows: according to the composition of steel slag, control the mass ratio of steel slag, water, and concentrated hydrochloric acid (37% mass concentration) to 1:2.4:2.4, stir evenly, react with oxygen at 25-30°C for 7 days, and stir regularly during this period , to promote the full oxidation of the dissolved ferrous ions into ferric iron. After the reaction, all the materials are dried and used as acidified steel slag modifiers. At this time, the Al in the materials is meas...

Embodiment 2

[0055] The acidified steel slag prepared in Example 1 was selected as the improved material. Taking saline-alkali soil in Baicheng area, Jilin Province as the object of improvement, the soil type tested is soda-type saline-alkali soil, and its salinity content and other indicators are shown in Table 4.

[0056] Table 4 Salinity composition and content of the tested soil

[0057]

[0058] A total of three plots were set up in the area to be improved, which were respectively the experimental plots of Example 2, Control 1 and Control 2. The area of ​​each plot is 6×5m 2 , the planted crop is rice. Among them, the crest width of the irrigation ditch is 0.8m, and the depth is 0.6m; the crest width of the drainage ditch is 0.7m, and the ditch depth is 1m; the crest width of the ditches is 0.6m, and the height is 0.4m. According to the requirements of formulas (1) to (4), add 36 kg of acidified steel slag, mix the three materials evenly, and apply them to the saline-alkali soil...

Embodiment 3

[0065] The acidified steel slag prepared in Example 1 was selected as the improved material. Taking saline-alkali soil in Jilin area as the object of improvement, the type of soil tested is soda-type saline-alkali soil, and its salinity content and other indicators are shown in Table 6.

[0066] Table 6 Salinity composition and content of the tested soil

[0067]

[0068] A total of three plots were set up in the area to be improved, which were the test plots of Example 3, Control 1 and Control 2, respectively. The area of ​​each plot is 6×5m 2 , the planted crop is rice. Among them, the crest width of the irrigation ditch is 0.8m, and the depth is 0.6m; the crest width of the drainage ditch is 0.7m, and the ditch depth is 1m; the crest width of the ditches is 0.6m, and the height is 0.4m. According to the requirements of formulas (1) to (4), add 40 kg of acidified steel slag, mix the three materials evenly, and apply them to the saline-alkali soil to be improved before ...

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Abstract

The invention aims to solve the problem that soda saline-alkali soil has no good improvement means, and provides a soda saline-alkali soil improver and an improvement method. Steel slag is subjected to acid dissolution, iron, calcium, aluminum, magnesium and other elements in the steel slag are extracted, part of ferrous iron in the steel slag is oxidized into ferric iron through oxidation, a mixed system is dried to prepare an improver, and the improver is quantitatively applied to soda saline-alkali soil to be improved. Iron ions, calcium ions, magnesium ions and aluminum ions in the improver react with carbonate ions and bicarbonate ions in the soda saline-alkali soil to finally generate iron oxyhydroxide, aluminum hydroxide, carbonate or basic carbonate precipitates, so that carbonateions and bicarbonate ions which are relatively great in harm in the soda saline-alkali soil are reduced or eliminated, and meanwhile, the composition of soil ions is changed; and modifying the soda saline-alkali soil into non-soda saline-alkali soil.

Description

technical field [0001] The invention belongs to the technical field of saline-alkali soil improvement, and particularly relates to a method for changing the ion composition of soda saline-alkali soil by using acidified steel slag to realize the transformation from soda saline-alkali soil to non-soda saline-alkali soil, while reducing saline-alkali hazards and improving the efficiency of washing salt and alkali Improved methods and improved materials. Background technique [0002] Saline-alkali soil is a general term for saline soil, alkaline soil and various salinized and alkalized soils formed after the soluble salt in soil or groundwater accumulates on the soil surface. [0003] At present, the measures to control saline-alkali soil can be roughly divided into engineering improvement, chemical improvement, biological improvement and so on. Chemical improvement mainly improves soil structure, soil water and fertilizer retention capacity, and salt washing and desalination e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08A01B79/02C09K101/00C09K109/00
CPCC09K17/08A01B79/02C09K2101/00C09K2109/00Y02A40/20
Inventor 邵安林许灏高江赵虹徐久生陈晓寒李晓玲郝忠庆王志博潘大伟
Owner ANSTEEL GRP MINING CO LTD
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