Technological method for comprehensively recovering vanadium and potassium through acid leaching of pulverized fuel ash

Abstract

The invention relates to a technological method for comprehensively recovering vanadium and potassium through acid leaching of pulverized fuel ash. The technological method comprises the following steps: (1) leaching-flying ash neutralization operation; (2) aluminum potassium sulfate crystallization operation; (3) lime neutralization operation; (4) reduction operation; (5) extraction-reextraction operation; (6) crystallization-vanadium precipitation operation; and (7) bichromate calcination operation. Potassium can be recovered by crystallization through using leached supernate, and partial impurity aluminum can be effectively utilized; ammonium alum can be prepared from return water through crystallization, thus further recovering impurity aluminum and also providing a guarantee for quality of finally produced up-to-standard refined vanadium; an extraction raffinate returns to the leaching operation after being treated, no waste water is emitted, and simultaneously the recovery rate of potassium can also be improved. The method is low in running cost, capable of guaranteeing the smoothness of the whole vanadium extraction technology, and less in environmental pollution.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for comprehensively recovering vanadium and potassium by vanadium-containing type stone coal combustion power generation and acid leaching of fly ash. Background technique [0002] Vanadium extraction from stone coal is an important aspect of comprehensive utilization of stone coal resources. my country has started the related research and production of vanadium extraction from stone coal since the 1960s. The technical level of vanadium extraction from stone coal has been greatly improved, but there are Problems such as low vanadium recovery rate, high reagent consumption, high cost, and easy pollution are still prominent; and there are few theoretical studies on the extraction of vanadium from stone coal, and the research methods are single, especially the related theoretical research on the roasting process and leaching process is relatively weak , which seriou...

AI Technical Summary

Problems solved by technology

[0004] At present, manufacturers in the country use stone coal-type vanadium ore to refine vanadium pentoxide. The production process is to directly smelt the raw ore. The grade of vanadium pentoxide in the raw ore is 0.9-1%, and the smelting recovery rate is about 60%. Larger waste, more materials consumed, higher cost

If the stone coal-type vanadium ore is subjected to high-acid leaching, the recovery rate of vanadium pentoxide is increased to more than 80%, and impurity ions and associated beneficial components will be enriched in the leachate, further impurity removal and comprehensive recovery of beneficial components. a series of questions

Images