A method of transforming heavy metal tailings slag into soil capable of growing plants

A heavy metal and tailings slag technology, which is applied to the restoration of vegetation on the surface of heavy metal tailings ponds and the field of anti-erosion fertile soil, can solve problems such as no specific guidance plan, and achieve the effect of restoring mine vegetation, maintaining water and soil, and low cost

Active Publication Date: 2022-05-17
INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above technologies are how to transform the heavy metal tailings slag into the soil that can grow plants in the present invention, so that it is difficult to grow any plants on the surface of the tailings pond to grow lush vegetation, so as to realize passivation of tailings heavy metals, water and soil conservation, The purpose of restoring mine vegetation and improving the ecological environment has not given a specific guidance plan

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  • A method of transforming heavy metal tailings slag into soil capable of growing plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: The effect of different combinations of various materials required to transform heavy metal tailings slag into soil capable of growing plants on the ecological restoration of tailings ponds.

[0019] Test site: a polymetallic tailings pond in Guangxi, with a storage capacity of 1.24 million cubic meters and a height of 59 meters. It stopped being used in 2014 and is facing closure. There is no vegetation on the ground, and ecological restoration work is to be carried out. After collecting and testing the tailings pond waste residue, it was found that it contained high concentrations of heavy metal elements, such as: cadmium 12.1mg / kg, arsenic 3500mg / kg, lead 831mg / kg, zinc 1220mg / kg, etc. If treatment and restoration are not carried out, there will be a great risk of pollution to the downstream water body, soil, animals, plants and human body. Establish a 4m×5m test plot to verify the effect of different combinations of five materials on the ecological resto...

Embodiment 2

[0022] Example 2: 1) Tailings pond to be repaired: a mine tailings pond in Hebei, with a storage capacity of 500,000 cubic meters, has been out of use for 4 years, and the vegetation on the tailings slag surface is sparse. Among them, 410mg / kg of heavy metal copper, 2040mg / kg of zinc, and 14.99mg / kg of cadmium were measured, and 10 mu were selected for ecological restoration work. The tailings pond belongs to the flat land type tailings pond. 2) Purchase materials: 60 tons of sawdust, 20 tons of decomposed cow dung, 3.5 tons of clay, 5.5 tons of biomass power plant ash, 35 kg of MgO, 103 kg of CaO, 100 kg of polyacrylamide, 500 kg of urea, and 1000 kg of diammonium phosphate. 3) Equipment: 500L turning drum mixer, 50KW Raymond mill, mechanical hopper, fan, dust collector.

[0023] The method for transforming heavy metal tailings slag into soil capable of growing plants is characterized in that it comprises the following process steps:

[0024] (1) Prepare material A, materia...

Embodiment 3

[0027] Example 3: 1) Tailings pool to be repaired: a metal mine tailings pool in central my country, with a total volume of 300,000 cubic meters of slag and sparse vegetation on the surface. Among them, 2250mg / kg of heavy metal lead, 2040mg / kg of zinc, and 4.32mg / kg of cadmium were measured, and 5 mu were selected to carry out ecological restoration work. 2) Purchase materials: 50 tons of sawdust, 15 tons of decomposed chicken manure, 1.6 tons of clay, 2.7 tons of biomass power plant ash, 24 kg of MgO, 78 kg of CaO, 50 kg of polyacrylamide, 250 kg of urea, 500 kg of diammonium phosphate . 3) Equipment: 500L turning drum mixer, 50KW Raymond mill, mechanical hopper, fan, dust collector.

[0028] The method for transforming heavy metal tailings slag into soil capable of growing plants is characterized in that it comprises the following process steps:

[0029] (1) Prepare material A, material B, material C, material D, and material E.

[0030](1) Preparation material A: collect...

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Abstract

A method for transforming heavy metal tailings slag into soil that can grow plants, collecting the waste slag on the surface of the heavy metal tailings pond, mixing the waste slag, sawdust, and organic fertilizer to obtain material A; grinding clay, biomass power plant ash Mix with MgO and CaO to obtain material B; mix acrylic acid, water, sodium hydroxide solution, ammonium persulfate, N,N-methylenebisacrylamide, and montmorillonite, react, and dry to obtain material C; material D is polyacrylamide; mix urea and diammonium phosphate and dissolve in water to obtain material E. After the material A is rotary plowed into the surface of the tailings pond and matured, the materials B, C, and D are evenly spread and then rotated into the surface of the tailings pond. After watering and reacting, plants are planted on the surface of the improved heavy metal tailings pond. The material E is then sprayed to make lush plants grow on the surface of the heavy metal tailings pool where it is difficult to grow plants. The invention simultaneously realizes the purposes of passivating heavy metals in tailings, maintaining water and soil, restoring vegetation in mines, and improving ecological environment.

Description

technical field [0001] The invention relates to a method for restoring vegetation on the surface of a heavy metal tailing pond, and belongs to the technical field of soil improvement and mine ecological restoration. Furthermore, it belongs to a technology that transforms heavy metal tailings with high content of effective heavy metals, serious soil erosion, and difficulty in growing vegetation into an anti-erosion fertile soil layer that can well grow vegetation. Specifically, it is a method of transforming heavy metal tailings slag into soil that can grow plants. Background technique [0002] The tailings slag formed after metal ore beneficiation still contains a certain amount of heavy metals. Although it has lost the beneficiation value, its heavy metal concentration is still high as soil. In addition, because it is ground from ore, it has large sandiness, low clay content, lack of nutrients, and loose physical structure. These shortcomings make the surface of the taili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08C09K17/40B09C2101/00
Inventor 宋乐韩占涛张发旺张勤军栾崧黄桂强康志强
Owner INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
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