Fast weathering and pedogenesis method for barren rock containing sulfide mineral

A mineral and rapid technology, applied in the field of ecological restoration in mining areas, can solve the problems of ecological environment damage in soil extraction areas, high cost of soil extraction and loading and unloading transportation, and lack of soil resources, so as to avoid ecological damage and save soil extraction and loading and unloading transportation in different places The effect of fees

Active Publication Date: 2019-08-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for areas with many rocks and little soil, soil resources are scarce, and soil acquisition from other places to close the site and store stock has problems such as difficulty in obtaining soil, high cost of soil acquisition, loading, unloading and transportation, and damage to the ecological environment in the area where the soil is extracted.

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  • Fast weathering and pedogenesis method for barren rock containing sulfide mineral

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Embodiment 1

[0038] A method for quick weathering of nickel sulfide ore mining waste rock to form soil, specifically comprising the following steps:

[0039] (1) During the mining process of a nickel sulfide ore, a large amount of waste rock containing iron sulfide, copper sulfide, and manganese sulfide was piled up, and the pure strain of Thiobacillus was purchased to prepare a concentration of 10 9 For cfu / mL bacterial liquid, the pH of the bacterial liquid is controlled at 5.0, the temperature is 25°C, and the oxidation-reduction potential: 300mV;

[0040] (2) at 3L / (h∙m 2 ), use the bacterial solution in step (1) to rinse the waste rock pile for 24 hours a day to make the waste rock fully contact with the bacterial solution. During the leaching process, oxygen is continuously injected into the waste rock pile to keep the liquid The dissolved oxygen concentration in the phase is 2mg / L, and carbon dioxide is supplemented to maintain the carbon-to-nitrogen ratio (C / N) in the liquid phase...

Embodiment 2

[0043] A method for rapidly weathering coal gangue into soil, specifically comprising the following steps:

[0044](1) In a coal mine waste rock yard, a large amount of coal gangue was piled up, and the pure strain of Sulfolobus was purchased to prepare a concentration of 10 3 cfu / mL bacterial solution. Control the pH of the bacterial solution to 2.0, the temperature to 68°C, and the oxidation-reduction potential: 500 mV;

[0045] (2) Soak coal gangue with the bacterial solution in step (1), aerate continuously, and keep the dissolved oxygen concentration in the liquid phase at 10 mg / L; control the potassium ion concentration in the liquid phase to 0.25-3.0g / L, phosphate The concentration is 0.5-1.5g / L, the magnesium ion concentration is 0.1-1.5g / L, and the calcium ion concentration is 0.01-0.1g / L. In this process, sulfur-oxidizing bacteria oxidize SO in coal gangue 3 , FeS 2 , generate sulfuric acid and ferric sulfate solution, sulfuric acid corrodes coal gangue, and the ...

Embodiment 3

[0048] A method for rapid weathering of chalcocite mining waste rock into soil, specifically comprising the following steps:

[0049] (1) During the mining process of a chalcocite ore, a large amount of Cu 2 S, FeS 2 After domestication and expanded cultivation, the sulfur-oxidizing bacteria obtained include acidophilic Thiobacillus, Leptospira, Acidophilus, Sulfobacillus and Ferrobacter, and the concentration of sulfur-oxidizing bacteria is controlled at 10 5 cfu / mL; the culture conditions are pH: 1.0, temperature: 10°C, redox potential: 900 mV;

[0050] (2) at 40L / (h∙m 2 ), the waste rock is rinsed with the bacterial solution in step (1) for 1 hour every day to make the waste rock fully contact with the bacterial solution. During the rinsing process, oxygen is continuously injected into the waste rock pile to maintain the liquid phase The concentration of dissolved oxygen in the medium is 4 mg / L, and carbonate is added to maintain the carbon-nitrogen ratio (C / N) in the li...

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Abstract

The invention discloses a fast weathering and pedogenesis method for barren rock containing sulfide mineral, and belongs to the field of ecological remediation of a mining area. The method is characterized by utilizing sulphur-oxidising bacteria for liquid leaching or soaking the barren rock containing the sulfide mineral, and maintaining the full contact of the sulphur-oxidising bacteria and thebarren rock and an oxidation atmosphere; and oxidizing and dissolving the sulfide mineral in the barren rock through the sulphur-oxidising bacteria so as to enable the structure strength of the barrenrock to be reduced, then crushing, smashing and sieving the barren rock, continuously bio-oxidation leaching and crushing the barren rock with the super-standard particle size, and regarding the barren rock with the standard particle size as coarse sand for sealing and closing of a mine lot. According to the fast weathering and pedogenesis method for the barren rock containing the sulfide mineralprovided by the invention, aiming at the problems such as high cost in sampling soil at different places and severe ecological damage caused by sealing and closing of the rocky mine lot with few soil, through the combination of biological weathering and physical weathering, the in-situ fast weathering and pedogenesis of the barren rock of the mine lot is realized, and the problems of difficulty in sampling soil, high soil sampling, loading, unloading and transporting cost, and severe ecological damage occurred in a traditional sealing and closing process are effectively solved.

Description

technical field [0001] The invention relates to a rapid weathering soil-forming method of waste rock containing sulfide minerals, which belongs to the field of ecological restoration of mining areas. Background technique [0002] After the mining of the mine is completed, it is necessary to cover the site and close the warehouse according to the requirements of the state. However, for areas with many rocks and little soil, soil resources are scarce, and soil acquisition from other places for closed sites and storage has problems such as difficulty in obtaining soil, high cost of soil acquisition, loading, unloading and transportation, and damage to the ecological environment in the area where soil is borrowed. Therefore, it is particularly urgent to seek a method of in-situ rapid weathering of waste rock into soil. [0003] The ore composition of domestic mining areas is mostly sulfide ore, and the waste rock discharged during the mining process mostly contains sulfide mine...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00Y02P10/20
Inventor 胡学伟党雅馨田森林黄建洪李英杰宁平
Owner KUNMING UNIV OF SCI & TECH
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