Environment-friendly type technique for vanadium extraction of stone coal

Abstract

The invention discloses a environment-friendly type craft to extract vanadium from bone coal, which comprises the following steps: processing raw material; blanket-baking; leaching with diluted acid; converting; absorbing with resin; getting ammonium metavanadate; dissolving alkali; proceeding thermal decomposition; producing high-grade vanadic oxide; adopting wet process smoke discharging method and environmental degassing unit to dispose the waste gas; adopting spoil area to dispose waste slag water; using circulating water system to dispose the waste water; removing the pollution for environment; making the direct recovery ratio of pure vanadium reach about 65% and purity of vanadic oxide reach 99%. This invention possesses high recovery ratio, low consumption of material, good quality and low cost, which is a new craft without pollution.

Description

technical field [0001] The invention relates to a technology for extracting vanadium pentoxide from stone coal, in particular to a new environment-friendly technology. Background technique [0002] Vanadium pentoxide, a rare metal, symbol V 2 o 5 , used in metallurgy, chemical industry, petroleum, medical treatment, glass, pigment, electronics, nuclear industry, etc., has great uses. There are hundreds of vanadium-containing minerals, but only vanadium-titanium magnetite and stone coal have industrial mining and utilization value. my country is relatively rich in vanadium resources. According to information, by the end of the last century, my country's annual output of vanadium pentoxide was about 17,000 tons, ranking fourth in the world. my country's enterprises that use stone coal as raw material to extract vanadium developed rapidly in the 1980s. At present, vanadium extraction from stone coal mainly adopts the production process of "additives or no-roasting-leaching-...

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Problems solved by technology

[0004] 2. Diversification of roasting additives and different pollution conditions: the traditional process uses salt as the additive for vanadium-containing stone coal oxidized sodium roasting, and the hydrogen chloride and chlorine in the roasting flue gas cause serious pollution to the surrounding environment; the roasting additives currently used in production There are salt and calcium salt binary additives, and the proportion of salt has dropped from more than 10% to about 5%, but it still has a great impact on the environment

[0005] 3. When the leaching process adopts water leaching, the main substance of a large amount of vanadium slag after leaching is silicon dioxide, but there is still a small amount of vanadium, causing pollution

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