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A Method for Ecological Restoration on Acid Tailings Pool

A technology for ecological restoration and tailings pond, applied in the fields of botanical equipment and methods, planting substrates, and restoration of polluted soil, which can solve the problems of downstream personal safety and natural environment threats, large amount of engineering, and no plant survival.

Active Publication Date: 2021-04-20
杰瑞(莱州)矿山治理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Under normal environmental conditions, the surface covered by tailings has been idle for many years, the surface layer is hardened, and there are basically no plants in the storage area. The biomass at the boundary of the storage area has also decreased significantly, and it occupies a large amount of land resources.
[0004] (2) Diffusion of tailings particles: due to the small particle size of tailings, it is not easy to bond during storage, and it is easy to be washed away under the action of hydraulic force, which poses a huge threat to downstream personal safety and the natural environment
Physical and chemical remediation methods include: alien soil method, leaching precipitation method, electrochemistry method, magnetization method and agricultural chemical regulation method. The above methods have their own advantages, but they all have problems such as large amount of engineering, high cost, and secondary pollution.
The bioremediation method mainly selects plants with strong resistance, and uses the method of ecological restoration to control the acid tailings pond. Due to the strong acid environment, the seed reproduction cannot survive, and the method of "cultivating first and then transplanting" is generally adopted. However, Whether the transplanted seedlings can adapt to the acidic environment becomes the key factor, the survival rate is low, the effect of repeated transplanting and ecological restoration is slow, time-consuming, and cannot fundamentally solve the problem of underground pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1, in a tailings pond in the south, the heavy metals with environmental pollution risks are zinc, arsenic, cadmium, and hexavalent chromium. The area of ​​the test section is selected to be 100 square meters, and the pH of the tailings acidic water is measured to be 3.02, and the conductivity is 1325 μs / cm. Ecological restoration method: (1) remove the acidic water in the tailings; (2) lay anti-corrosion non-woven fabric at 50cm of the tailings; (3) lay a 3cm-thick sealing layer on the anti-corrosion non-woven fabric, sodium humate 10 %, silty clay 45%, calcium carbonate powder 15%, tailings powder 30%; (4) Lay a 5cm thick aquifer on the sealing layer, red loam 15%, tailings powder 50%, decomposed matrix 20% , fly ash 5%, humic acid 5%, water-retaining material 3%, negative polyacrylamide 2%; (5) hydrodynamically sowing a 1cm-thick coated seed layer on the aquifer; (6) artificial maintenance; The measured water permeability coefficient of the sealing layer is ...

Embodiment 2

[0027] Example 2, in a tailings pond in the south, the heavy metals with environmental pollution risks are zinc, arsenic, cadmium, and hexavalent chromium. The area of ​​the test section is selected to be 100 square meters, and the pH of the tailings acidic water is measured to be 3.02, and the conductivity is 1325 μs / cm. Ecological restoration method: (1) remove the acidic water in the tailings; (2) lay anti-corrosion non-woven fabric at 70cm of the tailings; (3) lay a 5cm thick sealing layer on the anti-corrosion non-woven fabric, sodium humate 25 %, silty clay 35%, calcium carbonate powder 5%, tailings powder 35%; (4) lay a 10cm thick aquifer on the sealing layer, red loam 25%, tailings powder 35%, decomposed matrix 24% , 7% of fly ash, 7% of humic acid, 1.5% of water-retaining material, 0.5% of negative polyacrylamide; (5) spraying a 3cm-thick coated seed layer on the aquifer; (6) artificial maintenance; The water permeability coefficient of the sealing layer is measured...

Embodiment 3

[0028] Example 3, in a tailings pond in the south, the heavy metals with environmental pollution risks are zinc, arsenic, cadmium, and hexavalent chromium. The area of ​​the test section is selected to be 100 square meters, and the pH of the tailings acidic water is measured to be 3.02, and the conductivity is 1325 μs / cm. Ecological restoration method: (1) remove the acidic water in the tailings; (2) lay anti-corrosion non-woven fabric at 60cm of the tailings; (3) lay a 4cm thick sealing layer on the anti-corrosion non-woven fabric, sodium humate 12 %, silty clay 37%, calcium carbonate powder 8%, tailings powder 43%; (4) lay a 7cm thick aquifer on the sealing layer, red loam 17%, tailings powder 37%, decomposed matrix 30% , fly ash 8%, humic acid 5%, water-retaining material 2%, negative polyacrylamide 1%; (5) hydraulically spray and sow a 2cm thick coating seed layer on the aquifer; (6) artificial maintenance, The measured water permeability coefficient of the sealing layer...

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PUM

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Abstract

The invention provides a method for ecological restoration on the acid tailings pond, by discharging acid to the soil, laying anti-corrosion non-woven fabric and sealing layer to achieve good isolation, and then laying a water storage layer and a coated seed layer to realize Regreening purpose on acid tailings pond. Beneficial effects: it can store rainwater to the greatest extent, and the sealing layer can prevent rainwater from penetrating into the tailings, fundamentally solving the problem of polluting groundwater and surface water. The construction method is simple and the construction cost is low; the seed coating technology is used to form a set of rapid Breeding seedling technology, cultivating a stable ecological restoration system, realizing the goal of complete regreening of woody plants in 90 days, and solving the environmental problems of pickling tailings ponds once and for all.

Description

technical field [0001] The invention relates to the field of mine ecological restoration, in particular to a method for carrying out ecological restoration on an acid tailing pond. Background technique [0002] Tailings are the waste left after the extraction of useful minerals through the crushing, grinding, and sorting of ores in the mine beneficiation production. It can be called tailings slurry. In the existing technology, the tailings slurry produced by ore dressing is generally transported to the tailings storage system through the tailings conveying system for centralized stacking, and the stacked tailings waste is produced. The adverse consequences mainly consist of the following points: [0003] (1) Under normal environmental conditions, the surface covered by tailings has been idle for many years, the surface layer is hardened, and there are basically no plants in the storage area. The biomass at the boundary of the storage area has also decreased significantly, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
CPCA01G17/005A01G24/10A01G24/20A01G24/22A01G24/23A01G24/28A01G24/35A01G24/46B09C1/105
Inventor 杨建国任广滨梁欢王少光
Owner 杰瑞(莱州)矿山治理有限公司