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Method of bacterial eliminating sulfur in high sulfur bauxite

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

Active Publication Date: 2007-03-07
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 has not been reported in the desulfurization of high-sulfur bauxite. 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
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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 water, and cultured in 9K medium without ferrous ions (M9K - ) as the medium, using high-sulfur bauxite with a sulfur content of 3.83% for domestication and cultivation, and the domestication process gradually increases the concentration of bauxite slurry (1%, 2%, 5%, 10%), and obtains high-efficiency Thiobacillus mixed The SEM images of the strains and bacteria are shown in Figure 1.

[0026] The enriched strains of Thiobacillus ferrooxidans obtained by screening and domestication are used for leaching of high-sulfur bauxite. Ferrous 9K medium without sterilization. Take the acclimation medium and inoculate it in 9K medium, and when the bacteria are cultured to the exponential growth phase, they are used for the inoculation of the leaching test. The pH of the leaching system was 2.0, the rotating speed of the ...

Embodiment 2

[0029] Other conditions are the same as Example 1. The pH of the leaching system is 2.0, the rotating speed of the shaking table is 250r / min, the leaching mineral sulfur content is 3.83%, the leaching temperature is 25°C, the inoculation amount is 10%, the pulp concentration is 10%, the mineral sulfur content is 0.55% after leaching for 20 days, and the desulfurization rate is 86.96%. Al 2 O 3 The recovery rate was 97.21%.

Embodiment 3

[0031] Other conditions are the same as Example 1. The pH of the leaching system is 1.5, the rotating speed of the shaking table is 150r / min, the leaching mineral sulfur content is 3.83%, the leaching temperature is 30°C, the inoculum amount is 10%, the mineral sulfur content is 0.81% after leaching for 15 days, the desulfurization rate is 80.97%, the Al 2 O 3 The recovery rate was 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 bacterial removal of impurity sulfur in high-sulfur bauxite. It 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 content of lutetite, pyrite starts to react with alkaline solution at 180℃, and it aggravates with the increase of temperature and alkali concentration. Marcasite, especially pyrite, is more easily decomposed by alkaline solution. The reaction mechanism is: iron sulfide first decomposes into sodium disulfide, sodium disulfide is unstable in sodium aluminate solution at high temperature, and decomposes to generate sodium sulfide and sodium thiosulfate, and finally oxidizes into sodium sulfate and enters the solution. . Since sulfur is gradually oxidized into sulfate in alumina production and accumulate...

Claims

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Application Information

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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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