Modifier for rare earth tailing sand remediation and treatment method for rare earth tailing sand

A technology of tailings sand and improver, which is applied in chemical instruments and methods, botanical equipment and methods, applications, etc., and can solve problems such as short duration, high cost of polymer compounds, and hazards to plants and microorganisms

Active Publication Date: 2019-10-15
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the physical method refers to covering the abandoned land with topsoil, including topsoil backfilling and mellow soil covering in different places. However, the methods of backfilling topsoil and mulching soil in different places are costly and can only be used in areas with sufficient soil resources, and are not suitable for Ionic rare earth mining areas with shortage of soil resources and severe soil erosion
The chemical method uses modifiers to repair rare earth tailings. Although it is not limited by the richness of soil resources, there are still some shortcomings in the application of existing modifiers: the improvement effect of natural modifiers is limited, and there is a problem of short duration ; The high cost of artificially synthesized polymer compounds and the potential risk of environmental pollution limit its wide application; Municipal sludge modifiers contain unavoidable harmful ingredients, which are harmful to plants and microorganisms

Method used

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  • Modifier for rare earth tailing sand remediation and treatment method for rare earth tailing sand

Examples

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preparation example Construction

[0039] The present invention has no special limitation on the preparation method of the improving agent described in the above technical solution, and the technical solution prepared by a composition well known to those skilled in the art can be used, specifically: the sepiolite, animal excrement, humic acid Mixed with biochar to obtain a modifier for repairing rare earth tailings sand. In the present invention, the mixture is preferably stored in bags, preferably 50 kg per bag, so as to facilitate the metering during administration.

[0040] The present invention also provides a treatment method for rare earth tailings, comprising the following steps:

[0041] (1) applying the improving agent described in the above-mentioned technical scheme to rare earth tailings;

[0042] (2) Planting drought-tolerant herbaceous plants on the rare earth tailings sand after applying the modifier.

[0043] In an embodiment of the present invention, the mass percentage of organic matter in t...

Embodiment 1

[0057] The preparation of the improver: 4 parts of sepiolite, 3 parts of chicken manure, 2 parts of humic acid and 2 parts of biochar.

[0058] Among them, the pH value of sepiolite is 10.5, the organic matter is 0.95%, the CEC is 18cmol / kg, the pore diameter is 1.35nm, and the specific surface area is as high as 900m 2 / g; the component is Mg 3 Si 2 (OH) 4 o 5 9%, Si 3 o 6 ·H 2 O 8%, CaMgSi 2 o 6 17% and CaCO 3 66%;

[0059] The pH value of chicken manure is 6.23, and the organic matter content is 63.2g·kg -1 , N, P, K are 16g·kg respectively -1 , 7.3g·kg -1 、6.2g·kg -1 ;

[0060] Humic acid has a pH value of 4.0, organic matter (dry basis) 65%, humic acid (dry basis) 40%, CEC≧250meq / 100g, particle size 5mm.

[0061] Biochar particle size is 2mm, specific surface area is 50.22m 2 / g, pH value is 7. Biochar components: C 75.22%, H2.36%, N 1.01%, O 17.45%, total potassium 11.01% and total phosphorus 2.64%, of which the crude ash is 2.67wt%.

[0062] The simu...

Embodiment 2

[0066] The preparation of the improver: 4 parts of sepiolite, 3 parts of chicken manure, 2 parts of humic acid and 2 parts of biochar.

[0067] Among them, the pH value of sepiolite is 9.8, the organic matter is 0.83%, the CEC is 15cmol / kg, the pore diameter is 1.30nm, and the specific surface area is as high as 900m 2 / g; the component is Mg 3 Si 2 (OH) 4 o 5 8%, Si 3 o 6 ·H 2 O 10%, CaMgSi 2 o 6 15% and CaCO 3 67%;

[0068] The pH value of chicken manure is 6.5, and the organic matter content is 65.8g·kg -1 , N, P, K are 20g·kg respectively -1 , 8.3g·kg -1 , 11.5g·kg -1 ;

[0069] Humic acid has a pH value of 5.5, organic matter (on a dry basis) 73%, dry basis humic acid is 40% of the mass of wet humic acid, CEC≧300meq / 100g, and a particle size of 4.5mm.

[0070] The particle size of biochar is 2.8mm, and the specific surface area is 60.30m 2 / g, pH value is 8.0. Biochar components: C 57.23%, H 2.36%, N 1.9%, O 17%, total potassium 10.67% and total phospho...

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Abstract

The invention provides a modifier for repairing rare earth tailing sand and a treatment method of the rare earth tailing sand. The modifier is prepared from sepiolite, animal dung, humic acid and charcoal in a mass ratio of (0.05 to 0.5) : (0.05 to 0.3) : (0.03 to 0.2) : (0.04 to 0.3). Under the coordination of the sepiolite, the animal dung, the humic acid and the charcoal, repairing of the rare earth tailing sand is realized, no chemical substance is introduced, and secondary damage to soil is avoided; moreover, the soil fertility is improved by comprehensive application of the modifier.

Description

technical field [0001] The invention belongs to the technical field of soil treatment, and in particular relates to a modifier for repairing rare earth tailings and a treatment method for rare earth tailings. Background technique [0002] my country is the country with the richest rare earth resources, especially the ionic rare earth mines in southern Jiangxi. Due to the influence of disorderly supervision and backward mining technology in the early stage, the in-situ leaching process called "Mountain Moving Movement" was mainly used in the early stage of mining to strip the vegetation covered on the surface of rare earth ore, and inject it with ammonium sulfate, ammonium nitrate and other solutions. Coarse rare earth raw ore is extracted from boreholes, and the waste piles produced after the raw ore extraction are called tailings. The soil in a large number of tailings accumulation sites is acidic and has a low pH, which reduces the soil nutrient content, barren soil, and b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40A01G2/00C09K109/00
Inventor 赵龙侯红杨侨孙在金
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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