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Biological dealkalizing method for red mud

A technology of dealkalization and red mud, applied in 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: 2018-04-17
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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  • Biological dealkalizing method for 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 biological dealkalizing method for red mud. The biological dealkalizing method for red mud comprises the following steps: inoculating aspergillus niger-spores suspension in aculture medium and fermenting in a fermenting tank to produce acid; feeding generated fermentation liquor into a bacteria-liquid separating tank; feeding the separated fermentation liquor in a coagulating sedimentation tank and further removing tiny mycelia and suspended matters in the fermentation liquor; and then feeding the clean fermentation liquor in a dealkalizing tank and carrying out acid-alkali neutralization reaction and solid-liquid separation on the clean fermentation liquor and red mud powder, wherein after separation, supernatant liquid is dealkalized liquid, and the lower partis dealkalized red mud. In a batched running mode of the process method, the red mud and microbial cells are completely separated, red mud filter residues and fungi which are obtained by biological dealkalizing can be recycled, moreover, the biological dealkalizing process method can be industrially produced and run, and therefore, environmentally friendly, low-cost and large-scale running of a whole red mud biological dealkalizing process is 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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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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