Secondary leaching process used for acid-leaching vanadium-extracting tailings and belt type leaching filter system thereof

Abstract

The invention discloses a secondary leaching process used for acid-leaching vanadium-extracting tailings and a belt type leaching filter system thereof, and belongs to the technical field of vanadiummetal smelting processes. The invention provides the secondary leaching process capable of effectively reducing TV content in the acid-leaching vanadium-extracting tailings and the belt type leachingfilter system thereof. The secondary leaching process is characterized in that the acid-leaching vanadium-extracting tailings are taken as raw materials, leaching water with a reduced pH value is leached by at least twice in a circulating mode, content of TV in the vanadium-extracting tailings is reduced by reducing content of soluble (+)5-valency vanadium ions in the acid-leaching vanadium-extracting tailings, and the pH value of the leaching water at each stage is not greater than 3.0. The belt type leaching filter system comprises a belt type filter, a leaching filter room and a tertiary washing water acid-regulating assembly, the leaching filter room comprises a vacuum gas-liquid separating room, a liquid output end of the tertiary washing water acid-regulating assembly communicates with the vacuum gas-liquid separating room above a leaching section at the third stage, and the pH value of the collected recycled water is regulated to be 1.4-1.6 through the tertiary washing water acid-regulating assembly.

Description

technical field [0001] The invention relates to a secondary leaching process, in particular to a secondary leaching process used for acid leaching of vanadium tailings, and belongs to the technical field of vanadium metal smelting process methods. The present invention also relates to a belt rinsing filter system for the secondary process. Background technique [0002] The "vanadium oxide clean production process" adopts the process flow of vanadium slag "calcification roasting - sulfuric acid leaching - acid precipitation". During the sulfuric acid leaching process, the vanadium extraction tailings produced are an important part of vanadium loss, which affects the vanadium loss of the system. yield. [0003] The prior art is aimed at calcified roasting clinker. By adopting stable liquid-solid ratio, leaching pH, leaching temperature and leaching time, the whole leaching process is basically stable, and the vanadium leaching rate is 95%-97%. The obtained leaching slurry is...

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Problems solved by technology

[0004] In practical applications, due to changes in the content of TV (total vanadium) and soluble vanadium (V5+) in the clinker, in addition, due to reasons such as equipment accuracy or unrigorous post operation, the parameters of the leaching process such as liquid-solid ratio, leaching pH, leaching There will also be certain fluctuations in temperature, etc., resulting in a relatively high content of TV in the vanadium extraction tailings. Part of the soluble vanadium is not fully washed on the belt filter, and thus enters the slag, resulting in the loss of vanadium. At present, there is no stable reduction in the vanadium extraction tailings. Method for dissolving vanadium in slag

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