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Method for promoting lead-zinc ore plant recovery by using organic and inorganic composite modifier

An inorganic compound and modifier technology, applied in the restoration of polluted soil, etc., can solve the problems of strict requirements, difficulty in fully exerting the function of organic soil and calcium carbonate, and complicated production process of organic soil, so as to prevent soil erosion and dust. , Improve physical and chemical properties, improve the effect of mining environment

Inactive Publication Date: 2020-09-22
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of making soil with organic matter is complex and demanding, and the organic soil and lime powder are only spread without being fully mixed with the polluted soil, so it is difficult to give full play to the role of organic soil and calcium carbonate

Method used

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  • Method for promoting lead-zinc ore plant recovery by using organic and inorganic composite modifier
  • Method for promoting lead-zinc ore plant recovery by using organic and inorganic composite modifier
  • Method for promoting lead-zinc ore plant recovery by using organic and inorganic composite modifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] For the test material oleander ( Nerium indicum ) was purchased from a nursery in Hunan. It is an annual seedling, and seedlings with similar height and thickness are selected for use. The lead-zinc tailings were collected from a tailings pond of a lead-zinc mine in Hunan Province. The pH value of the tailings was 7.37, the organic matter content was 25.95 mg / g, the lead content was 4297.08 mg / kg, and the zinc content was 3704.92 mg / kg.

[0037] A kind of organic and inorganic compound improver promotes the method main steps of lead-zinc ore plant recovery as follows:

[0038] 1) Select peat soil and calcium carbonate separately, crush them in a room temperature grinder, and grind them to less than 2 mm;

[0039] 2) Mix peat soil and calcium carbonate according to the mass ratio of 1:1, stir and mix repeatedly to obtain a composite improver, which is marked as N+C;

[0040] 3) According to the mixing ratio of 10%, add the compound improver to the heavy metal polluted...

Embodiment 2

[0073] The present invention also measures the influence of different mass ratios of peat soil and calcium carbonate on the physical and chemical properties of tailings, so as to select the best mixed mass ratio of 1:1. The specific experimental methods and measurement results are as follows:

[0074] The lead-zinc tailings were collected from a lead-zinc mine tailings pond in Hunan, and passed through a 20-mesh sieve after natural air drying. The pH of the tailings was 7.13, and the cation exchange capacity was 11.45 cmol kg. -1 , lead content 4981.25 mg / kg, zinc content 5000.34 mg / kg.

[0075] Composite improver design: peat soil and calcium carbonate (N+C), mixed evenly according to the ratio of 1:1, 1:2, 2:1.

[0076] For the slag control (CK), the compound improver was added according to the mass ratio of 10%, 20%, and 30%. There were 10 treatment groups, and each treatment group had 3 parallel samples.

[0077] Mix the compound improver with the slag to be tested, weigh...

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Abstract

The invention discloses a method for promoting lead-zinc ore plant recovery by using an organic and inorganic composite modifier, which comprises the following steps: 1) selecting peat soil and calcium carbonate, grinding and crushing; 2) uniformly mixing and stirring peat soil and calcium carbonate according to a mass ratio of 2: 1-1: 2 to obtain a composite modifier; 3) adding the composite modifier into the heavy metal contaminated soil, repeatedly and uniformly plowing, and fully mixing the heavy metal contaminated soil to obtain mixed heavy metal contaminated soil; and 4) selecting fast-growing woody plants resistant to heavy metals, planting the fast-growing woody plants in the mixed heavy metal contaminated soil, and ploughing the soil regularly. By adding the organic and inorganiccomposite improver, the physicochemical properties of lead-zinc mining area soil are effectively improved, mining area lead-zinc ore and mining area water and soil are fixed, the growth of heavy metalresistant woody plant seedlings is promoted, water and soil loss and dust raising are prevented, and the mining area environment is improved; the growth of woody plants realizes the transfer of the lead-zinc ore to the plants, and reduces the content of the lead-zinc ore in the soil.

Description

technical field [0001] The invention relates to the technical field of mine phytoremediation, in particular to a method for promoting the recovery of lead-zinc ore plants by an organic and inorganic compound improver. Background technique [0002] Lead-zinc tailings have the characteristics of high heavy metal content, strong toxicity, and poor soil physical and chemical properties, resulting in low vegetation coverage and serious soil erosion in mining areas. Rainwater erosion and surface runoff have further aggravated the water pollution around the mining area. Vegetation restoration in mining areas plays an important role in ecological restoration of mines. The vegetation in the mining area has a certain accumulation effect on heavy metals. It can not only effectively prevent soil erosion and dust diffusion, but also fix lead-zinc mine pollution through plant root exudates and reduce the content of bioavailable heavy lead and zinc. [0003] At present, plant species tha...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/105B09C2101/00
Inventor 苏荣葵陈永华欧琪琪杜露柳俊
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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