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Method for removing pyritic sulfur in gangue by microbe

A technology of microorganisms and coal gangue, applied in the field of microbial desulfurization, can solve problems such as air pollution, achieve the effects of eliminating spontaneous combustion, preventing water pollution and air pollution, and solving adverse effects

Inactive Publication Date: 2008-02-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existence of a large number of coal gangue dumps is likely to cause air pollution

Method used

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  • Method for removing pyritic sulfur in gangue by microbe
  • Method for removing pyritic sulfur in gangue by microbe
  • Method for removing pyritic sulfur in gangue by microbe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The mass content of treated sulfur (as SO 3 %) is 2.73% coal gangue, crush the coal gangue into particles of about 0.1mm, take the granular coal gangue and put it into the cultivated culture medium M1 containing Thiobacillus ferrooxidans at a rate of 10g / L. The formula of M1 is:

[0025] (NH 4 ) 2 SO 4

[0026] The pH value of the culture medium M1 is 1.5, with H 2 SO 4 Adjustment; the concentration of Thiobacillus ferrooxidans in culture medium M1 reaches 10 7 The number of pieces / mL; leaching by stirring for 7 days, the desulfurization rate can reach 97.5%.

Embodiment 2

[0028] The coal gangue in Example 1 is crushed into particles of about 10 mm, and put into the ferrous oxide-containing Leptospira culture medium M2 that has been cultivated at 60 g / L. The formula for each liter of culture medium M2 is:

[0029] (NH 4 ) 2 SO 4

[0030] The pH value of the culture medium M2 is 2.5, with H 2 SO 4 Adjustment; the concentration of Leptospira ferrous oxide in the culture medium M2 reaches 10 8 The number of pieces / mL; the desulfurization rate can reach 97.0% by leaching for 10 days by aeration.

Embodiment 3

[0032] The coal gangue in Example 1 is crushed into particles of about 20 mm, and put into the cultivated Thiobacillus ferrooxidans-containing culture medium M1 at 100 g / L; the formula of every liter of culture medium M1 is:

[0033] (NH 4 ) 2 SO 4

[0034] The pH value of the culture medium M1 is 2.0, with H 2 SO 4 Adjustment; the concentration of Thiobacillus ferrooxidans in culture medium M1 reaches 10 9 The number of pieces / mL; leaching by stirring for 15 days, the desulfurization rate can reach 96.5%.

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Abstract

The invention discloses a method of stripping pyrone sulfur from coal gangue using microorganism. The method includes disintegrating coal gangue to particulate of 0.1-300mm, inputting into culture liquid containing microorganism, and keeping extraction for 7-30 days; the extraction condition is: the proportion of the coal gangue and the culture liquid containing microorganism is 10-500g / L, the bacteriological density of the culture liquid containing microorganism reaches magnitude order of more than 107 per milliliter, the PH value of the culture liquid is 1.5-3.0, and the agitation mode, aeration mode, mode connecting agitation and aeration or sleep mode can be adopted for extraction. Performing biological treatment for coal gangue, the invention removes the self-inflammable hazard of coal gangue, solves the bad effect of coal gangue resource utilization because of the existence of sulfur, and can prevent water contamination and air pollution, which has distinctive environmental benefit and social benefit.

Description

technical field [0001] The invention relates to a microbial desulfurization method, in particular to a method for utilizing microorganisms to remove sulfur from pyrite in coal gangue. Background technique [0002] Coal gangue is solid waste produced during coal mining and washing and processing, and is the industrial waste with the largest annual discharge and cumulative stock in my country. The accumulation of coal gangue not only occupies a large amount of land, but also produces a series of environmental problems after long-term physical and chemical effects such as weathering, leaching, oxidation and spontaneous combustion. When studying the environmental effects of coal gangue, the content of sulfur is an important indicator. The sulfur in coal gangue is mainly sulfide, which mainly occurs in pyrite (FeS 2 )middle. The existence of pyrite in coal gangue is the root cause of water pollution and spontaneous combustion of gangue. FeS 2 The heat released by air oxidatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 郑正王艳锦彭晓成周培国帖靖玺唐登勇喻晓张继彪李继红李培陪李军状孟卓
Owner NANJING UNIV
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