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Desilicication-digestion two-stage type bioleaching method for radioactive elements in red mud

A radioactive element and biological leaching technology, applied in the removal of solid waste, etc., can solve problems such as reducing the efficiency of biological leaching, and achieve the effect of reducing costs, saving processing costs, and saving high-temperature sterilization costs.

Active Publication Date: 2018-06-26
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high salinity and metal toxicity of red mud have a strong biological inhibitory effect on the leaching functional bacteria (such as Aspergillus niger and Penicillium) used in bioleaching technology, which will seriously reduce the efficiency of bioleaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The preparation method of Bacillus mucilaginosus activation solution: inoculate Bacillus mucilaginosus in the sterilized activation culture medium and culture at 30°C for 3 days. Activation medium components (all by weight): sucrose 2%, yeast extract 0.2%, MgCl 2 0.02%, CaCO 3 0.01%, Fe 2 (SO 4 ) 3 0.005%, the solvent is deionized water.

[0042] The sterilization conditions of the desiliconization medium and the activation solution of Bacillus glaciens were sterilization at 121°C for 20 minutes.

[0043] (4). The mycelium pellets obtained by the membrane filtration method in step (2) are added to the desilicated medium treated in step (3), so that the organic acid produced by the physical contact of the mycelial pellets and the metabolism of the bacteria The radioactive elements in silicate minerals such as zircon can be leached into the leaching solution. The added amount of mycelium pellets is 1 to 5% of the weight of the sterilized desilication medium (without silica...

Embodiment

[0046] 1. Mix the red mud and water uniformly to make a slurry, enrich and separate the silicate minerals mainly zircon in the red mud by flotation. The composition of the flotation agent (all by weight): 0.24% of oleic acid, 0.28% of oxidized paraffin soap, and 0.32% of rosin oil.

[0047] 2. Prepare the leaching medium, the composition of the leaching medium (all by weight): 20% sucrose, 0.1% yeast extract, 0.1% peptone, and deionized water as the solvent. Place 1L of leaching medium in a 5L beaker, and sterilize in an autoclave at 121°C for 20 minutes. After the leaching medium is cooled, 10 mL of Aspergillus niger spore suspension is inoculated. Place the culture medium on a shaker and incubate at 32°C and 120 rpm for 72 hours. After the cultivation is completed, filter the medium containing the mycelial pellets in a vacuum filter to obtain the mycelial pellets and the sterilized culture solution, which are respectively placed in the freezer for later use.

[0048] 3. Prepar...

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Abstract

The invention discloses a desilicication-digestion two-stage type bioleaching method for radioactive elements in red mud. The method comprises the steps that silicate minerals in the red mud are separated out through a flotation method, a leaching culture medium is inoculated with aspergillus niger spore suspension for culture, and mycelium pellets and a degermed culture solution are obtained through filtering; the silicate minerals are added into a desilicication culture medium, the desilicication culture medium is inoculated with a bacillus mucilaginosus activation solution for culture, themycelium pellets are added into the processed desilicication culture medium to be cultured, and the radioactive elements in the silicate minerals are leached into leachate through physical contact ofthe mycelium pellets and an organic acid soluble mode of thallus metabolites; and red mud residues remaining in the flotation method are added into the obtained degermed culture solution, and the radioactive elements in the red mud residues are further leached through an organic acid leaching mode. According to the method, the leaching efficiency of the radioactive elements in the red mud is high,inorganic acid does not need to be added, the reaction conditions are mild, no pollution is generated, and the cost is low; meanwhile, the radioactivity of the red mud residues is reduced, and the double purposes of reclamation and harmlessness of the red mud are achieved.

Description

Technical field [0001] The present invention relates to a resource utilization and harmless method of industrial solid waste, in particular to a biological leaching method of radioactive elements in red mud. Background technique [0002] Red mud is a solid or semi-solid silt-like waste discharged during the alumina production process. The output of red mud varies with ore grade, production technology and technical level. Every 1.0 ton of alumina produced will emit 0.8 to 2.0 tons of red mud. At present, the total stock of red mud on a global scale has exceeded 2.7 billion tons and is increasing at a rate of 120 million tons per year. my country's red mud emissions exceed one third of global production. In 2016, my country's cumulative red mud stockpiles exceeded 400 million tons. With the decrease in the grade of bauxite in my country and the annual increase in alumina production, the annual production of red mud is still increasing. [0003] The current disposal method of red m...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 曲洋李辉王学猛田文杰王小庆
Owner LUOYANG INST OF SCI & TECH