Method for improving soda saline-alkali soil

A saline-alkali soil and soda technology, which is applied in field preparation methods, chemical instruments and methods, soil conditioning materials, etc., can solve problems such as imbalanced ion composition, high content of bicarbonate ions, and great harm, and achieve low prices and reduce salinity and alkalinity. Harm, the effect of improving soil structure

Inactive Publication Date: 2021-01-15
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for improving soda saline-alkali soil in order to solve the problems of excessively harmful carbonate ion and bicarbonate ion content and ion composition imbalance in soda-type saline-alkali soil with regional and local characteristics

Method used

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  • Method for improving soda saline-alkali soil
  • Method for improving soda saline-alkali soil
  • Method for improving soda saline-alkali soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The iron tailings were selected and sieved to obtain the part with a particle size of 50-200 μm (see Table 1 for the chemical element content of the iron tailings), whose main components are silicon dioxide and ferric oxide. In the plexiglass tank, the mass ratio of iron tailings, water, and concentrated sulfuric acid is controlled to be 100:50:25 respectively. Among them, the sulfuric acid is firstly added to the water to dilute, and then the iron tailings are added, stirred evenly, and passed through at 25-30°C. Oxygen (insert the mixed material with a perforated plastic tube, and adopt fan forced ventilation to supply oxygen) was reacted for 15 days, during which it was stirred regularly to promote the full oxidation of the dissolved ferrous ions. Put all the materials into an oven and dry them to prepare the improver. Determination of Fe in modifier 3+ The content is 107.8cmol / kg.

[0037] Table 1 Determination results of chemical elements in iron tailings (%)

...

Embodiment 2

[0048] The iron tailings were selected and screened to obtain the part with a particle size of 50-200 μm (see Table 3 for the chemical element content of the iron tailings), whose main components are silicon dioxide and ferric oxide. In the plexiglass tank, the proportions of iron tailings, water, and concentrated sulfuric acid are controlled to be 100:50:25 respectively. Among them, sulfuric acid is first added to the water, and then the iron tailings are added. Stir evenly. Oxygen (insert the mixed material with a perforated plastic tube, and use a fan to force ventilation) to react for 15 days, and stir regularly during this period to promote the full oxidation of the dissolved ferrous ions. Put all the materials into an oven and dry them to prepare the improver. Determination of Fe in modifier 3+ The content is 108.3cmol / kg.

[0049] Table 3 Determination results of chemical elements in iron tailings (%)

[0050]

[0051]

[0052] Taking the saline-alkali soil in ...

Embodiment 3

[0060] The iron tailings were selected and sieved to obtain the part with a particle size of 50-200 μm (see Table 1 for the chemical element content of the iron tailings), whose main components are silicon dioxide and ferric oxide. In the plexiglass tank, the proportions of iron tailings, water, and concentrated sulfuric acid are controlled to be 100:50:25 respectively. Among them, sulfuric acid is firstly added to water to dilute, and then iron tailings are added. Stir evenly. Under oxygen flow (insert the mixed material with a perforated plastic tube, and use a fan to force ventilation) to react for 15 days, during which regular stirring is performed to promote the full oxidation of the dissolved ferrous ions. Put all the materials into an oven and dry them to prepare the improver. Determination of Fe in modifier 3+ The content is 107.8cmol / kg.

[0061] Taking the saline-alkali soil in Jilin City as the object of improvement, the soil category is soda saline-alkali soil, a...

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Abstract

The invention provides a method for improving soda saline-alkali soil in order to solve the problems that carbonate ions and bicarbonate ions which have great harm in the soda saline-alkali soil withregional and local characteristics are too high in content, and ion composition is imbalanced. According to the method, mineral iron is dissolved out of iron tailings through acid, the iron tailings are chemically oxidized into ferric iron, then a mixed system is dried to prepare an improver, the improver is quantitatively applied to the soda saline-alkali soil to be improved, the carbonate ions and the bicarbonate ions which are greatly harmful in the soda saline-alkali soil are reduced or eliminated, meanwhile, the composition of soil ions is changed, the soda saline-alkali soil is transformed into sulfate saline-alkali soil, and the salt and alkali washing efficiency of the soil is improved.

Description

technical field [0001] The invention belongs to the technical field of saline-alkali soil improvement, in particular to a method for improving soda-type saline-alkali soil by using iron tailings to prepare a modifier. Background technique [0002] Iron tailings are the remaining parts after crushing, screening, grinding, grading, gravity separation, flotation and other sorting processes to select useful iron and other metals from raw iron ore. The grade of iron ore in my country is low and there are many associated ores, so a large amount of tailings will be discharged during the beneficiation process, and 2.5-3.0 tons of tailings will be discharged for every 1 ton of iron concentrate produced. At the same time, with the improvement of the utilization of mineral resources to a certain extent , the mineable grade of ore is correspondingly reduced, and the discharge of tailings is also increasing day by day. Generally, iron tailings are landfilled for a long time. This method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02C09K17/02C09K101/00C09K109/00
CPCA01B79/02C09K17/02C09K2101/00C09K2109/00
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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