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Method of bacterial eliminating sulfur in high sulfur bauxite

A bauxite, high-sulfur technology, applied in the direction of bacteria, improvement of process efficiency, etc.

Active Publication Date: 2008-07-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is mainly used in coal desulfurization, flue gas desulfurization, production waste gas desulfurization and biometallurgical leaching process of copper, gold, nickel, cobalt and other metals, and has achieved remarkable results, but there has been no report on the desulfurization of high-sulfur bauxite. Bacterial leaching can remove most of the impurity sulfur in high-sulfur bauxite

Method used

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  • Method of bacterial eliminating sulfur in high sulfur bauxite
  • Method of bacterial eliminating sulfur in high sulfur bauxite
  • Method of bacterial eliminating sulfur in high sulfur bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An enriched strain of Thiobacillus ferrooxidans with the ability to oxidize ferrous ions, elemental sulfur and sulfides was isolated from high-sulfur coal mine pit water, and the ferrous ion-free 9K medium (M9K - ) as the medium, and the high-sulfur bauxite with a sulfur content of 3.83% is used for domestication and cultivation, and the domestication process gradually increases the slurry concentration of the bauxite (1%, 2%, 5%, 10%) to obtain efficient Thiobacillus Mixed strains, the SEM image of the bacteria is shown in figure 1 .

[0026] The enriched strain of Thiobacillus ferrooxidans obtained by screening and domestication is used for leaching of high-sulfur bauxite. The high-sulfur bauxite is crushed, and the particle size of the ore sample after fine grinding is less than 40 mesh. The leaching solution is prepared with tap water The 9K medium without ferrous ions does not need to be sterilized. Take the acclimatization culture solution and inoculate it in 9K...

Embodiment 2

[0030] Other conditions are the same as Example 1. The pH of the leaching system is 2.0, the rotating speed of the shaker is 250r / min, the leaching mineral sulfur content is 3.83%, the leaching temperature is 25°C, the inoculum size is 10%, and the pulp concentration is 10%. After leaching for 20 days, the mineral sulfur content is 0.55%, and the desulfurization rate is 86.96%. Al 2 o 3 The recovery rate is 97.21%.

Embodiment 3

[0032]Other conditions are the same as Example 1. The pH of the leaching system is 1.5, the rotating speed of the shaker is 150r / min, the leached mineral sulfur content is 3.83%, the leaching temperature is 30°C, the inoculum size is 10%, the mineral sulfur content after leaching for 15 days is 0.81%, the desulfurization rate is 80.97%, Al 2 o 3 The recovery rate is 92.49%.

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Abstract

The invention discloses a desulfurizing method in the high-sulfur alumina ore through alumina bacteria, which comprises the following steps: adopting Acidithiobacillus ferrooxidans to immerse high-sulfur alumina ore; breaking alumina ore; grinding; adopting water culture medium to immerse ore with density at 5-30%; setting the immersing temperature at 25-35 deg.c and rotary speed of shaker at 150-250r / min; making the bulk density of vaccination quantity of enriched bacterial liquid at 5%-10%; leaching for 10-20d; extracting leached ore; washing; desulfurizing.

Description

technical field [0001] A method for bacteria to remove impurity sulfur in high-sulfur bauxite. The invention relates to a method for bauxite bacterial leaching and desulfurization. Background technique [0002] The main sulfide minerals contained in high-sulfur bauxite are pyrite (FeS 2 ) and its isomers marcasite and pyrite and gypsum CaSO4 a class of sulfates. In bauxite with high luteite content, pyrite starts to react with alkali solution at 180°C, and it intensifies with the increase of temperature and alkali concentration. Marcasite, especially colloidal pyrite, is more likely to be decomposed by alkali solution. The reaction mechanism is: iron sulfide first decomposes into sodium disulfide, sodium disulfide is unstable in sodium aluminate solution at high temperature, then decomposes to form sodium sulfide and sodium thiosulfate, and finally oxidizes into sodium sulfate into the solution . Since sulfur will gradually oxidize to sulfate in the production of alumina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C12N1/20
CPCY02P10/20
Inventor 李花霞周吉奎李军亮曹慧君王淑华
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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