Ecological restoration method for mining waste land

An ecological restoration and wasteland technology, applied in the restoration of polluted soil, etc., can solve the problems of unsustainability, high cost, secondary pollution, etc., and achieve the effect of improving nutrients, low cost and good fertilizer efficiency.

Active Publication Date: 2021-06-11
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide an ecological restoration method to solve the problems of high cost, unsustainability and possible secondary pollution in the existing mining wasteland restoration method

Method used

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  • Ecological restoration method for mining waste land
  • Ecological restoration method for mining waste land

Examples

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Embodiment 1

[0068] This embodiment carries out ecological restoration for the tailings of graphite ore dressing, and the process is as follows:

[0069] Step 1. Crushing straw, sawdust, fruit peel, bagasse, coconut shell, bamboo, fallen leaves and livestock manure, the particle size after crushing is 0.073mm; hydrothermally carbonizing the crushed waste biomass, and the crushed waste biomass The mass ratio to water is 1:1; the hydrothermal carbonization temperature is 160°C, and the hydrothermal carbonization time is 60 minutes; the hydrothermal carbonization product is subjected to solid-liquid separation to obtain solid hydrothermal carbon and hydrothermal carbon liquid;

[0070] Step 2. Add solid hydrothermal carbon to potassium dihydrogen phosphate solution with a mass concentration of 800mg / L for eutrophication. After eutrophication, perform solid-liquid separation and dry treatment. The drying temperature is 69°C to obtain eutrophication Hydrothermal carbon;

[0071] Step 3, fully ...

Embodiment 2

[0075] In this embodiment, ecological restoration is carried out for bauxite dressing tailings, and the process is as follows:

[0076] Step 1. Crushing straw, sawdust, fruit peel, bagasse, coconut shell, bamboo, fallen leaves and livestock manure, the particle size after crushing is 0.054mm; hydrothermally carbonizing the crushed waste biomass, and the crushed waste biomass The mass ratio to water is 1:5; the hydrothermal carbonization temperature is 320°C, and the hydrothermal carbonization time is 290 minutes; the hydrothermal carbonization product is subjected to solid-liquid separation to obtain solid hydrothermal carbon and hydrothermal carbon liquid;

[0077] Step 2. Add solid hydrothermal carbon to the potassium dihydrogen phosphate solution with a mass concentration of 1600mg / L for eutrophication. After eutrophication, perform solid-liquid separation and dry treatment. The drying temperature is 60°C to obtain eutrophication Hydrothermal carbon;

[0078] Step 3. Fully...

Embodiment 3

[0082] This embodiment carries out ecological restoration for magnesite ore dressing tailings, and the process is as follows:

[0083] Step 1. Crushing straw, sawdust, fruit peel, bagasse, coconut shell, bamboo, fallen leaves and livestock manure, the particle size after crushing is 0.054mm; hydrothermally carbonizing the crushed waste biomass, and the crushed waste biomass The mass ratio to water is 1:3; the hydrothermal carbonization temperature is 240°C, and the hydrothermal carbonization time is 180 minutes; the hydrothermal carbonization product is subjected to solid-liquid separation to obtain solid hydrothermal carbon and hydrothermal carbon liquid;

[0084] Step 2. Add solid hydrothermal carbon to the potassium dihydrogen phosphate solution with a mass concentration of 1200mg / L for eutrophication. After eutrophication, perform solid-liquid separation and dry treatment. The drying temperature is 55°C to obtain eutrophication Hydrothermal carbon;

[0085] Step 3. Fully ...

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Abstract

The invention relates to an ecological restoration method for mining wasteland, belongs to the technical field of ecological restoration of mines, and solves the problems that an existing restoration method for mining wasteland is high in cost and not sustainable and possibly causes secondary pollution. The ecological restoration method comprises the following steps: step 1, crushing waste biomass, performing hydrothermal carbonization, and performing solid-liquid separation on a hydrothermal carbonization product to obtain solid hydrothermal carbon and hydrothermal carbon liquid; step 2, adding the solid hydrothermal carbon into a nutrient solution for eutrophication to obtain eutrophicated hydrothermal carbon; step 3, mixing the eutrophicated hydrothermal carbon, water-absorbing minerals, biomacromolecules, a water absorbent monomer, a cross-linking agent and an inducer, and carrying out polymerization reaction to obtain a modifier; and step 4, adding the modifier into the mining wasteland soil, and planting plants for ecological restoration. According to the invention, the green and efficient modifier is prepared from the waste biomass, and an environment-friendly and sustainable mining waste land ecological restoration method is provided.

Description

technical field [0001] The invention relates to the technical field of mine ecological restoration, in particular to an ecological restoration method for mining abandoned land. Background technique [0002] With the development of society and the acceleration of industrialization, a huge variety of minerals have been mined. The mining of minerals generates significant amounts of mining waste, such as degraded mine sites and mineral processing tailings. There are many reasons for mining abandoned land, including the accumulation of stripped topsoil, the accumulation of rock fragments and low-grade ore, the accumulation of tailings, and the unusable land affected by mining. The key to ecological damage caused by mining is land degradation, that is, the deterioration of physical and chemical properties of abandoned soil, loss of nutrients, and increase of toxic and harmful substances in the soil. Site improvement is an important part of mining abandoned land restoration. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/08B09C1/00
Inventor 王重庆曹亦俊
Owner ZHENGZHOU UNIV
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