Treatment method for converting acidic tailings into soil

A treatment method and soilization technology, applied in chemical instruments and methods, recycling technology, solid waste removal, etc., can solve the problems of unable to promote the adaptive growth of plants, the soil is strongly alkaline, and the survival rate is low. The effect of increasing cation exchange, increasing soil water holding capacity, and improving survival rate

Active Publication Date: 2019-07-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that this invention exists is: after slaked lime and the acid waste water produced by tailings are neutralized, still contain a large amount of slaked limes in the abandoned mine tailings, although the solubility of slaked limes in water is very little, its pH is about 12, will make soil strong alkaline
[0005] To sum up, at present, the treatment of acid tailings wasteland in China generally adopts the method of covering the surface of the wasteland with foreign soil matrix (or neutralization slag) with different thicknesses, but the common problems are high cost, high cost, and serious secondary pollution. In addition, most guest soil substrates cannot promote the adaptive growth of plants when plants are planted in the later stage of improvement, resulting in low survival rate and slow improvement.

Method used

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  • Treatment method for converting acidic tailings into soil
  • Treatment method for converting acidic tailings into soil
  • Treatment method for converting acidic tailings into soil

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A method for soil treatment of acid tailings, specifically comprising the following steps:

[0027] (1) Raw material preparation: Air-dry the acid tailings and biomass waste separately (dry for 5 hours to make the moisture content below 20%), crush, and sieve (acid tailings and biomass waste pass through a 50-mesh sieve respectively , 100 mesh sieve), spare.

[0028] (2) Combustion: Take 1,000 kg of acid tailings and 3,000 kg of biomass waste, mix the acid tailings with one-third of the biomass waste evenly, make a pile of the mixture, then ignite the mixture pile, and wait for the biomass waste to Fully burn until the flame is extinguished, stir the mixed stockpile and spray with clean water. The amount of spraying is appropriate to ensure that there is no water seeping out of the stockpile.

[0029] (3) Carbonization: Fully mix the mixture treated in step (2) and the remaining biomass waste evenly, and place it in a carbonization furnace for carbonization after dryin...

Embodiment 2

[0040] A method for soil treatment of acid tailings, specifically comprising the following steps:

[0041] (1) Raw material preparation: Air-dry the acid tailings and biomass waste separately (dry for 4 hours to make the moisture content below 25%), crush, and sieve (acid tailings and biomass waste pass through a 50-mesh sieve respectively , 100 mesh sieve), spare.

[0042] (2) Combustion: Take 800 kg of acid tailings and 4000 kg of biomass waste, mix the acid tailings with 1 / 4 of the biomass waste evenly, make a pile of the mixture, then ignite the mixture pile, and wait for the biomass waste to Fully burn until the flame is extinguished, stir the mixed stockpile and spray with clean water. The amount of spraying is appropriate to ensure that there is no water seeping out of the stockpile.

[0043] (3) Carbonization: Fully mix the mixed material treated in step (2) with the remaining biomass waste evenly, put it in the carbonization furnace after drying, and first pass N 2 ...

Embodiment 3

[0054] A method for soil treatment of acid tailings, specifically comprising the following steps:

[0055] (1) Raw material preparation: Air-dry the acid tailings and biomass waste separately (dry for 3 hours to make the moisture content below 30%), crush, and sieve (the acid tailings and biomass waste pass through a 50-mesh sieve respectively , 100 mesh sieve), spare.

[0056] (2) Combustion: Take 1200 kg of acid tailings and 5000 kg of biomass waste, mix the acid tailings with one-fifth of the biomass waste evenly, make a pile of the mixture, then ignite the mixture pile, and wait for the biomass waste to Fully burn until the flame is extinguished, stir the mixed stockpile and spray with clean water. The amount of spraying is appropriate to ensure that there is no water seeping out of the stockpile.

[0057] (3) Carbonization: Fully mix the mixture treated in step (2) with the remaining biomass waste evenly, put it in the carbonization furnace after drying, and first pass N...

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Abstract

The invention discloses a treatment method for converting acidic tailings into soil, and belongs to the technical field of ecological restoration. The method comprises the following steps that biomasswaste and the acidic tailings are separately aired, crushed and sieved; the biomass waste and the acid tailings are carbonized to obtain a carbide; the carbide is uniformly spread on the waste land of the strong acid tailings, a certain amount of compound fertilizer, organic fertilizer and artificial soil are added into the carbide, and the mixture is uniformly mixed; and stress resistance trees,shrubs and herbaceous plants are selected to be planted. According to the method, the biomass waste such as straws are fully utilized, so that soil fertility is increased; meanwhile, carbonization isconducted to promote thermal weathering of the tailings, and the conversion of the tailings into the soil is accelerated, so that the ecological restoration is accelerated; and fine charcoal is wrapped around the acid tailings to isolate sulfur from being in contact with the air, so that generation of an acid liquid is reduced.

Description

technical field [0001] The invention relates to a soil treatment method for acid tailings, which belongs to the technical field of ecological restoration. Background technique [0002] Mining activities cause the discharge and storage of a large number of waste rock piles, which not only occupy a large amount of land resources, but also produce acidic substances when the ore debris (ie tailings) formed by a series of mining activities in the mining process comes into contact with the air. The extremely acidic environment is easy to accelerate the dissolution and poisoning of heavy metals. Tailings wasteland has great particularity, and its physical and chemical properties are quite different from normal soil, usually manifested as: extremely acidic (pH 2~4), lack of plant nutrition mechanism, serious soil erosion, heavy metal pollution Seriously wait. At the same time, the discharge of acidic waste water produced by tailings into rivers will increase the salinity and hardn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B5/00B09B3/40Y02W30/78
Inventor 黄建洪张琴田森林胡学伟李英杰
Owner KUNMING UNIV OF SCI & TECH
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