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Microbial capsule for tailing remediation and three-in-one tailing in-situ remediation method

An in-situ repair, three-in-one technology, applied in the direction of solid waste removal, fixation on or in inorganic carriers, etc., to achieve the effects of strong stability, strong isolation performance, and simple principle

Active Publication Date: 2021-06-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of repairing different types of complex mining areas, and to provide a three-in-one treatment and repair plan that divides the tailings pond into three parts: the surface layer, the insulating layer, and the bottom layer for separate treatment.

Method used

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  • Microbial capsule for tailing remediation and three-in-one tailing in-situ remediation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the aforementioned method, the contaminated tailings of a pyrite mine in Zhejiang were treated. The present embodiment selects pyrite heavy metal contaminated tailings to carry out the restoration experiment, which specifically includes the following steps: (1) raw material preparation: carry out bagging and washing with acid tailings soil, then add oxidant and fully stir to make it react, and then carry out Press filter, spare. (2) First, ore sand and microbial capsules are mixed and filled into the bottom layer of the tailings pond; then, the above-mentioned modified environmental minerals are evenly spread on the bottom layer of the acid tailings waste land, and the spreading thickness is 40cm. (3) Use microorganisms to pre-oxidize the tailings, and then mix catalysts and oxidants in the tailings to rapidly oxidize the tailings, and collect and treat the formed acidic wastewater in time. Add the pre-oxidized tailings sand and mix it evenly with the cata...

Embodiment 2

[0041] According to the aforementioned method, an acid tailings contaminated site in Gansu was treated. Add a mass fraction (relative) of 8.5% of the mixed agent to the acid tailings polluted site. After the contaminated soil is fully mixed with the agent, after natural aging, in the restored site, the organic matter content of the restored polluted soil increases by 35% %, the soil pH is significantly reduced, and the site can be used as planting soil. Concretely include the following steps: (1) Raw material preparation: bag the acid tailings sand, wash it with water, add an oxidizing agent and stir it sufficiently to make it react, and then carry out pressure filtration for standby. (2) First, ore sand and microbial capsules are mixed and filled into the bottom layer of the tailings pond; then, the above-mentioned modified environmental minerals are evenly spread on the bottom layer of the acid tailings waste land, and the spreading thickness is 40cm. (3) Use microorganisms...

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Abstract

The invention discloses a microbial capsule for tailing remediation and a three-in-one tailing in-situ remediation method. In the prior art, the operation and maintenance cost of acid wastewater treatment is high, the duration time is long, and the treatment effect is unstable. The invention provides a microbial capsule for tailing restoration. The microbial capsule comprises a porous calcium carbonate ball and a microbial agent loaded on the porous calcium carbonate ball. The microbial capsule can effectively inhibit the oxidation of sulfide minerals, and the microbial inoculum is not easy to lose. According to the separation layer, modified environmental minerals and metal ions are combined together, and a modified environmental mineral-metal combination is used as a separation substance, so that acidic wastewater formed after sulfide in an upper-layer tailing pond is oxidized can be prevented from permeating to a lower layer; and air on the upper layer is prevented from entering the bottom layer to oxidize sulfide minerals. On the basis, the isolation layer not only achieves the effect of adsorbing and isolating the pyrite, but also can oxidize sulfide minerals on the mineral surface layer through metal ions.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration, and in particular relates to a three-in-one method to control the source of tailings ponds that generate acidic mine wastewater, so as to achieve the effect of tailings treatment. Background technique [0002] Mineral resources are the material basis of economic and social development, and their demand has been kept at a high level in recent years. Although mineral mining has brought great economic benefits, the accompanying ecological damage cannot be underestimated. The mining process will destroy the original natural ecosystem in the mining area, gradually weakening the ecosystem function until it is lost, and a large number of mining abandoned land will lose its use value. There are many problems in the stacking and treatment of tailings after mining development. The sulfide minerals in the tailings are oxidized and converted into sulfate radicals, which will penetrate into su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N11/14B09B3/00
CPCC12N11/14B09B3/00Y02W30/40
Inventor 叶志平余生水王潇男任凌伟
Owner ZHEJIANG UNIV OF TECH
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