Continuous-leaching bioleaching device and method for red mud

Abstract

The invention discloses a continuous-leaching bioleaching device and method for red mud. The device sequentially comprises a batching tank, a leaching tank, a coagulating tank and a settling tank according to a connecting sequence, wherein a red mud power charge tube and a nutrient solution charge tube are arranged on the batching tank; an inoculating cover and a gas exhaust hole are arranged on the leaching tank; a pH value monitor, a dissolved oxygen monitor, a temperature control device and an aeration device are arranged inside the leaching tank; a stirring device is arranged in each of the batching tank, the leaching tank and the coagulating tank; a filter residue discharge tube on the bottom of the settling tank is connected with a plate-and-frame filter press; and compression leachate is connected with an inlet of the coagulating tank. The continuous-leaching bioleaching device takes aspergillus niger as a leaching strain, takes a continuous leaching mode as a leaching mode, andcan be used for large-scale production; mycelia of the leaching strain can be in sufficient contact with red mud particles, so that the mechanical damage effect, on red mud particles, of the myceliais brought into play, efficient leaching for metal elements in red mud can be kept, inorganic acid does not need to add, and secondary pollution is basically avoided, so that efficient, green and low-cost leaching of noble metal elements in the red mud is realized.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy of industrial solid waste, in particular to a continuous leaching bioleaching device and method for 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. [0003] Due to its unfavorable characteristics such as saline-alkaline, corrosive, and radioactive, most of the red mud cannot be used as a resource at present, and can only be stored for disposal. However, due to the bad characteristics of red mud, such as corrosivenes...

AI Technical Summary

Problems solved by technology

Existing studies have used fungi as the functional strains of bioleaching, but they are all carried out in the laboratory by methods of medium sterilization, strain transfer, and shaker culture, which cannot be used in large-scale industrial applications.

And the relevant researches all adopt the batch leaching mode of shaking flask culture. During the batch leaching process, microorganisms will have a significant growth lag period, which will obviously lead to the extension of bioleaching time, which is not conducive to the improvement of bioleaching efficiency.

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