A kind of sludge heavy metal resource recovery extraction system and its extraction method

Abstract

The invention relates to an extraction system and method for recycling sludge heavy metal. A culture solution storage tank is connected with a bioreactor; the bioreactor is connected with a biological leaching solution storage tank; the biological leaching solution storage tank is connected with a biological leaching reaction tank; the biological leaching reaction tank is connected with a solid-liquid separation pool a, the bottom of the solid-liquid separation pool a is connected with a solid collection pool, and the upper portion of the solid-liquid separation pool a is connected with a PH adjusting pool; the PH adjusting pool is connected with a solid-liquid separation pool b, the bottom of the solid-liquid separation pool b is connected with a solid recycling pool, the upper portion of the solid-liquid separation pool b is connected with a fluoride-removal filter tank, the solid recycling pool is connected with the biological leaching reaction tank, and the fluoride-removal filter tank is connected with a storage tank a; a liquid discharging opening of the storage tank a is connected with the bioreactor; the storage tank a is connected with a storage tank b, and a liquid outlet of the storage tank b is connected with a membrane distillation and concentration device; the membrane distillation and concentration device is connected with an extraction electrolysis device. According to the extraction system and method, the bioleaching technology is adopted, solid waste is treated while heavy metal is recycled, and the extraction system and method are economical, environmentally friendly and safe.

Description

Technical field: [0001] The invention relates to the field of sludge treatment equipment, in particular to a sludge heavy metal resource extraction system and an extraction method thereof. Background technique: [0002] Yellow mud is the main pollutant produced in the production process of stainless steel. It contains iron, heavy metals, chromium and other heavy metals. It may cause serious harm to the environment after landfill. Therefore, the treatment of yellow mud has become an important issue in environmental protection. . [0003] At present, the main method used for the removal of heavy metals in sludge is wet leaching. Wet leaching is the use of acid solution to extract metals from solid waste. Hydrometallurgy has strong selectivity, high recovery efficiency, less environmental pollution, and is easy to mass produce and automate. However, this wet extraction process using high-concentration strong acid as the working medium consumes a lot of strong acid, oxidant a...

AI Technical Summary

Problems solved by technology

However, this wet extraction process using high-concentration strong acid as the working medium consumes a lot of strong acid, oxidant and reducing agent; large-scale strong acid wet extraction also has high requirements for equipment materials, and the operating conditions are harsh. High security risk

These all limit the popularization and application of wet extraction process

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