Non-contact continuous biological dealkalization technology for red mud

Abstract

The invention discloses a non-contact continuous biological dealkalization technology for red mud. The technology comprises the following steps: injecting sterilized culture medium subjected to dealkalization strain inoculation into an acid production filtering tank, setting parameters at a starting stage, entering a continuous acid production state after the starting stage is operated for certaintime, adopting continuous liquor charging and continuous liquor discharging modes, ensuring that aspergillus niger is fermented to produce acid in the acid production filtering tank, conveying produced fermentation liquor into a dealkalization tank, ensuring that mycelium pellets are singly discharged, and red mud slurry and fermentation liquor are subjected to acid-base neutralization reaction,so as to reduce the basicity of the red mud, feeding a reacted mixed material into a solid-liquid separation tank, and ensuring that dealkalization liquor and the red mud subjected to dealkalization are both neutral and can be directly discharged or recycled. The technology has the advantages that red mud does not in direct contact with mycelium, the negative effect on the growth and reproductionof the mycelium by the venensity of red mud is avoided, continuous operation ensures that strain is always in a logarithmic phase, the negative effect caused by the lag phase and decline phase of thallus is avoided, and efficient, green and low-cost running of biological dealkalization technology for red mud is realized.

Description

technical field [0001] The invention relates to the field of harmless treatment of industrial solid waste, in particular to a red mud biological dealkalization system. 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 pollution to ...

AI Technical Summary

Problems solved by technology

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

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