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Method for transforming heavy metal tailing slag into soil capable of growing plants

A technology for heavy metals and tailings slag, which is applied to the restoration of vegetation on the surface of heavy metal tailings ponds and the field of anti-erosion fertile soil layers. It can solve problems such as no specific guidance plan, and achieve the effects of restoring mine vegetation, reducing renovation costs, and maintaining water and soil.

Active Publication Date: 2020-08-25
INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for transforming heavy metal tailing 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

The invention provides a method for transforming heavy metal tailing slag into soil capable of growing plants. The method comprises the steps that: waste slag on the surface of a heavy metal tailing pond is collected, and the waste slag, sawdust and organic fertilizer are mixed to obtain a material A; ground clay and biomass power plant ash are mixed with MgO and CaO, so that a material B can be obtained; acrylic acid, water, a sodium hydroxide solution, ammonium persulfate, N, N-methylene bisacrylamide and montmorillonite are mixed and undergo a reaction, drying is performed, so that a material C is obtained; a material D is polyacrylamide; urea and diammonium phosphate are mixed and dissolved in water, so that a material E can be obtained; after the material A is subjected to rotary tillage into the surface of the tailing pond to be cured, the material B, the material C and the material D are evenly spread and then subjected to rotary tillage into the surface of the tailing pond, plants are planted on the surface layer of the improved heavy metal tailing pond after watering reaction, and then the material E is sprayed, so that luxuriant plants can grow on the surface of the heavymetal tailing pond where the plants are difficult to grow. With the method adopted, the purposes of passivating tailings heavy metal, preserving water and soil, recovering mine vegetation and improving the ecological environment are achieved at the same time.

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 Applications(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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