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A kind of biological dealkalization method of red mud

A dealkalization and red mud technology, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve problems such as low dealkalization efficiency, and achieve easy maintenance, short dealkalization process, and simple mechanical equipment Effect

Active Publication Date: 2021-02-12
LUOYANG INST OF SCI & TECH
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Problems solved by technology

This method also has the defect of low dealkalization efficiency, and is only applicable to coastal areas

Method used

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  • A kind of biological dealkalization method of red mud

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Embodiment

[0066] Activate the preserved Aspergillus niger on the PDA plate, elute the mature spores with sterilized physiological saline solution to make a spore suspension, and adjust the concentration of Aspergillus niger spores in the spore suspension to about 1×108 / mL .

[0067] The culture medium is prepared, and its composition ratio is: 10% of sucrose, 0.015% of yeast extract, 0.02% of beef extract, 0.03% of KNO3, and the solvent is deionized water. The medium is added to the fermenter for sterilization. The model of the fermenter is Yangge YGF300 / s, with an effective volume of 20L. Adjust the sterilization parameters of the fermenter to 121.5°C and 103kPa, the sterilization time to 30min, and start the fermenter.

[0068] After the sterilization is completed, wait for the tank to cool down, and inoculate 50 mL of Aspergillus niger spore suspension in the fermenter. The fermentation conditions of the fermenter were set as follows: temperature 33° C., dissolved oxygen 2.6 mg / L,...

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Abstract

The invention discloses a method for biological dealkalization of red mud. Inoculate the suspension of Aspergillus niger spores on the culture medium and ferment it in a fermenter to produce acid. The tiny mycelium and suspended matter are further removed in the coagulation sedimentation tank, and then the clean fermentation broth is sent to the dealkalization tank and the red mud powder for acid-base neutralization reaction and solid-liquid separation process. The supernatant after separation is Dealkalization liquid, the lower part is red mud after dealkalization. In the batch operation mode of the process of the present invention, the red mud is completely separated from the microbial cells, and the red mud filter residue and fungal cells after biological dealkalization can be recycled, and the process of biological dealkalization can be industrialized and operated, thereby The green, environment-friendly, low-cost and large-scale operation of the whole red mud biological dealkalization process has been realized.

Description

technical field [0001] The invention relates to the field of harmless treatment of industrial solid waste, in particular to a method for biological dealkalization of red mud. Background technique [0002] Red mud is a solid or semi-solid powder mud solid waste produced by the alumina industry, which is rich in ferric ions and appears red or reddish brown. For every ton of alumina produced, about 1.5 tons of red mud will be produced. As of 2016, the global stockpile of red mud has exceeded 3 billion tons, and it is increasing at a rate of 120 million tons per year. my country's red mud stocks have exceeded 400 million tons, and the annual output of red mud has exceeded 60 million tons. At present, the resource utilization efficiency of red mud is very low, so most of the discharged red mud can only be stored and disposed of. However, due to the extremely high alkalinity of red mud, once the alkaline leachate of red mud flows out during storage, it will cause serious pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C12N1/14C12R1/685
CPCC02F11/02C12N1/14
Inventor 曲洋李辉吴长航田文杰王小庆
Owner LUOYANG INST OF SCI & TECH
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