A system and process for continuous recovery of mercury from pulse-lifting mine tailings

Abstract

The invention discloses a pulse rising type system for continuously recovering mercury from mine tailings. The system comprises a slurry preparation unit, a rising extraction unit, a flocculation separation unit and a solvent regeneration unit. The invention further comprises a pulse rising type process for continuously recovering the mercury from the mine tailings. The process comprises the following steps of slurry preparation, rising extraction, flocculation separation and solvent regeneration. According to the pulse rising type system and process for continuously recovering the mercury from the mine tailings, the pulse rising type system for continuously recovering the mercury from the mine tailings adopts a riser reactor for liquid-solid extraction for the first time, the riser reactor is composed of thick sections and fine sections in a staggered mode, so that the material backmixing degree is greatly enhanced, due to the fact that a baffle plate is arranged inside the riser reactor, the staying time is prolonged, the extraction is more thorough, the extraction efficiency is higher, and the pollution hazard of the mercury in the mercury-containing tailings to the environmentis greatly reduced; and a sodium thiosulfate solution for extracting the mercury is subjected to heating and bubbling of carbon dioxide, so that decomposition is enhanced, and thiosulfate after mercury decomposition is converted into a mercury sulfide precipitation form which is low in solubility, high in stability and low in toxicity.

Description

technical field [0001] The invention relates to the technical field of mine environmental protection equipment, in particular to a system and process for continuously recovering mercury from mine tailings of a pulse lift type. Background technique [0002] Mercury is a heavy metal pollutant with strong biological toxicity in the environment. It is difficult to be excreted after entering the organism, which seriously threatens human health. In the past ten years, the concentration of mercury in the environment has continued to rise around the world, which has attracted great attention from governments and environmental protection organizations, and has become another global environmental problem after climate change. [0003] At present, absorption method, adsorption method, gas phase reaction method, cooling method and combined purification method are commonly used in domestic purification of mercury vapor. Among them, the absorption method mostly uses substances with highe...

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Problems solved by technology

[0006] As for the mercury-containing tailings produced by non-ferrous metal mines and non-ferrous smelting enterprises in the production process, due to its large amount and complex composition, the treatment process is more complicated than mercury-containing solid waste such as waste mercury catalysts and mercury-containing thermometers.

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