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In-situ catalytic oxidation inactivation method for iron-sulfur oxidation acid-producing bacteria in extremely-acidified pyrite mountain soil

An in-situ catalysis, iron mine technology, applied in the field of mine ecological restoration, can solve the problems of increasing manpower, material cost, soil nutrient imbalance, accelerating soil magnesium and potassium, etc., to achieve low cost, avoid cost input and environmental pressure. , the effect of improving stability

Active Publication Date: 2022-07-12
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method can only precipitate Fe by increasing the pH 3+ , thereby inhibiting some free iron-sulfur oxidation acid-producing microorganisms, and has no obvious effect on the attached microorganisms; in order to control acid reflux, lime must be applied to the acidified soil many times, and long-term application of lime will not only increase the cost of manpower and material resources, but also cause soil pollution. Compaction, accelerated soil magnesium and potassium leaching, resulting in soil nutrient imbalance and other issues

Method used

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  • In-situ catalytic oxidation inactivation method for iron-sulfur oxidation acid-producing bacteria in extremely-acidified pyrite mountain soil
  • In-situ catalytic oxidation inactivation method for iron-sulfur oxidation acid-producing bacteria in extremely-acidified pyrite mountain soil

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Embodiment 1

[0033]The implementation site is located in a pyrite acidized tailings pond, which is a typical pyrite (FeS 2 ), a 100m×50m area was selected as the experimental site, and a 100m×50m area adjacent to the experimental site was selected as its control. The original soil conditions in this area are very bad, the pH of tailings is as low as 2.52±0.45, the degree of soil acidification is very serious, and there is no plant growth in the area. The area is governed by the following method steps:

[0034] (1) Surface trimming of extremely acidified mine soil, removal of stones, and filling of mining pits.

[0035] (2) The soil surface ploughing depth of the test site is 0.5m, and the water content of this batch of acidified tailings pond is calculated to be 2500m according to the moisture content required by the restoration process. 3 ; Mix 5.0 tons of sodium hypochlorite solid (industrial grade, effective substance content of 25% to 35%) and 2.5 tons of amino acid salt to obtain a ...

Embodiment 2

[0040] The implementation site is located in a compound iron ore acidified tailings pond, which not only contains a large amount of magnetite, but also some chalcopyrite and lead-zinc ore. An area of ​​80m × 50m was selected as the experimental site, and an area of ​​80m × 50m adjacent to the experimental site was selected as its control. The original soil conditions in this area are very bad, the pH of the tailings is as low as 3.02±0.56, the soil acidification degree is serious, and there is no plant growth in the area. The area is governed by the following method steps:

[0041] (1) Surface trimming of extremely acidified mine soil, removal of stones, and filling of mining pits.

[0042] (2) The soil surface ploughing depth of the test site is 0.5m, and the water addition amount of this batch of acidified tailings pond is calculated to be 2000m according to the moisture content required by the restoration process. 3 ; Mix 4.0 tons of calcium hypochlorite solid (industrial...

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Abstract

The invention particularly relates to an in-situ catalytic oxidation inactivation method of iron-sulfur oxidation acid-producing bacteria in extremely-acidified pyrite mountain soil, which comprises the following steps: carrying out surface finishing on the extremely-acidified pyrite mountain soil, compounding an oxidation agent, applying the compounded oxidation agent into the finished mine soil with the depth of 0-0.5 m, turning and mixing, spraying water, and maintaining for 3-7 days, thereby obtaining the iron-sulfur oxidation acid-producing bacteria in the extremely-acidified pyrite mountain soil. And then covering lime to adjust the pH value of the surface layer. According to the method, H < + > and Fe < 2 + > naturally existing in the extremely-acidic pyrite hill are utilized to catalyze pypocholoride to generate a strong oxidation effect, iron-sulfur oxidation acid-producing microorganisms are inactivated so as to inhibit soil acidification, and a covering layer is formed for lower-layer soil to protect the lower-layer soil so as to avoid oxidative acidification. The method is easy to operate, the demand quantity of pypocholoride is greatly reduced through in-situ catalysis, compared with a pure lime covering technology, the dosage of lime is greatly reduced, the problem of soil hardening is avoided, the input cost is low, the acidification inhibition effect is good, acid return is not prone to occurring, and the method can be used as a pretreatment step for ecological restoration of the extremely-acidified pyrite hill.

Description

technical field [0001] The invention belongs to the technical field of mine ecological restoration, and in particular relates to an in-situ catalytic oxidation inactivation method for acid-producing bacteria by oxidation of iron and sulfur in extremely acidified pyrite soil. Background technique [0002] Acidification of mining waste is a very serious and increasingly important environmental problem in China and the world. Most non-ferrous metal ores exist as various types of metal sulfides, such as pyrite (FeS 2 ), chalcopyrite (CuFeS) 2 ), sphalerite (ZnS), galena (PbS), arsenopyrite (FeAsS), etc. The sulfide in the exposed mine is oxidized and acidified under the action of air, water and microorganisms to form a high acidity (pH: 2.5-6) ​​containing a large amount of sulfate (1000-130000mg / L) and heavy metal ions (200-2000mg / L). Leachate - Acid Mine Drainage (AMD). Once AMD occurs, process control is difficult and the treatment cost is high; it is potentially corrosiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00Y02W10/10
Inventor 董滨孙相娟陈思思徐祖信
Owner TONGJI UNIV