Modifier for repairing rare earth tailing sand and treatment method of rare earth tailing sand

A technology for improving agent and tailings sand, which is applied in chemical instruments and methods, botanical equipment and methods, and applications, etc., can solve the problems of short duration, high treatment cost, and limited improvement effect of natural modifiers.

Active Publication Date: 2017-09-26
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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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 repairing rare earth tailing sand and treatment method of rare earth tailing sand

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preparation example Construction

[0039] The present invention does not have any special restrictions on the preparation method of the improver in the above technical scheme, and the technical scheme prepared by the composition well known to those skilled in the art can be used, specifically: the sepiolite, animal feces, humic acid Mixed with biochar to obtain the improver of rare earth tailing sand restoration. In the present invention, the mixture is preferably stored in the form of a bag, preferably 50 kg per bag, for convenient metering during application.

[0040] The invention also provides a method for treating rare earth tailings sand, including the following steps:

[0041] (1) Apply the improver described in the above technical scheme to rare earth tailings sand;

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

[0043] In the embodiment of the present invention, the mass percentage of organic matter in the rare earth tailing sand to ...

Embodiment 1

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

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

[0059] The pH 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 (calculated on a dry basis) 65%, humic acid (dry basis) 40%, CEC≧250meq / 100g, and a particle size of 5mm.

[0061] The particle size of biochar is 2mm and the specific surface area is 50.22m 2 / g, the pH 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 crude ash is 2.67wt%.

[0062] The simulation experim...

Embodiment 2

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

[0067] Among them, the pH value of sepiolite is 9.8, the organic matter is 0.83%, the CEC is 15 cmol / kg, the pore size is 1.30 nm, and the specific surface area is as high as 900 m. 2 / g; component is Mg 3 Si 2 (OH) 4 O 5 8%, Si 3 O 6 ·H 2 O 10%, CaMg Si 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 is pH 5.5, organic matter (calculated on a dry basis) is 73%, dry basis humic acid is 40% of the mass of wet humic acid, CEC≧300meq / 100g, particle size 4.5mm.

[0070] The particle size of biochar is 2.8mm and the specific surface area is 60.30m 2 / g, the pH is 8.0. Biochar components: C 57.23%, H 2.36%, N 1.9%, O 17%, total potassium 10.67% and total phosphorus 2.68%, of which the crude ash content is 1.32w...

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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 particularly relates to a modifier used for the repair of 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 ion-type rare earth mines in southern Jiangxi. Due to the early supervision disorder and the backward mining technology, the in-situ leaching process called "moving the mountain" was mainly used in the early stage of mining to strip the vegetation covering the surface of the rare earth mine, and use ammonium sulfate, ammonium nitrate and other solutions for injection The crude rare earth ore is extracted from the well hole, and the waste pile produced after the ore extraction is called tailings. The soil of a large number of tailings accumulation sites is acidic and has a low pH, which reduces the nutrient content of the soil, the soil is barren, and the gras...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40A01G1/00C09K109/00
Inventor 杨侨侯红赵龙孙在金
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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