Vanadium pentoxide extraction method by direct acid dipping of stone coal ash containing vanadium

A technology of vanadium pentoxide and coal ash, which is applied in the direction of vanadium oxide, etc., can solve the problems of unsatisfactory overall benefits, affecting extraction operations, and high acid consumption, so as to improve comprehensive utilization benefits, good operating environment, and labor productivity high effect

Inactive Publication Date: 2009-03-11
ZHEJIANG UNIV +1
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Problems solved by technology

However, in this process, the pickling solution with higher acidity is directly extracted. On the one hand, a large amount of impurities such as aluminum and iron contained in the solution will affect the extraction operation. On the other hand, a large amount of lye (generally ammonia water) must be used to neutralize the solution. To the pH value required for extraction (usually about 2.5), the consumption of acid and alkali is large, resulting in unsatisfactory overall benefits

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  • Vanadium pentoxide extraction method by direct acid dipping of stone coal ash containing vanadium

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Embodiment 1

[0055] Institute of Thermal Engineering, Zhejiang University, direct acid leaching extraction of coal ash slag by intermediate salt method V 2 o 5Pilot plant (including acid leaching glass-lined reaction kettle, ammonium alum production glass-lined reaction kettle, intermediate salt evaporation glass-lined reaction kettle, intermediate salt dissolution glass-lined reaction kettle, raw liquid extraction glass-lined reaction kettle, plexiglass tower extraction device, plexiglass tower stripping device, vanadium oxidation precipitation glass-lined reaction kettle and ammonium polyvanadate electric pyrolysis furnace), the treatment capacity of vanadium-containing ash and slag is 800kg / d, and the ash and slag used is discharged from the circulating fluidized bed combustion Bottom slag and dedusting ash, according to the mass ratio, the bottom slag is 25%, and the dedusting ash is 75%. After mixing, it will be used as ash and slag raw materials. Its chemical composition is: V 2 o ...

Embodiment 2

[0076] The vanadium-containing stone coal ash used is the bottom slag and dust removal ash discharged after circulating fluidized bed combustion. The bottom slag is 25% and the dust removal ash is 75% according to the mass ratio. After mixing, it is used as ash raw material. Its chemical composition is: V 2 o 5 1.26%, SiO 2 61.83%, Fe 2 o 3 6.90%, Al 2 o 3 16.58%, CaO 0.30%, MgO 1.31%. The analysis of the occurrence state of vanadium in the ash shows that most of the vanadium occurs in the mica ore, which is a hard-to-leach ore.

[0077] Vanadium pentoxide extraction steps are as follows:

[0078] (1) Acid leaching: Add 1590L of 5mol / L sulfuric acid solution and 533kg of vanadium-containing coal ash to an acid leaching glass-lined reactor, heat to 110-115°C for 4 hours, filter and wash, and take the filtrate to obtain acid leaching liquid, the residue contains V on a dry basis 2 o 5 0.26% (w / w); the residue can be transported to the slag yard for comprehensive utiliza...

Embodiment 3

[0089] The vanadium-containing stone coal ash used is the bottom slag and dust removal ash discharged after circulating fluidized bed combustion. The bottom slag is 25% and the dust removal ash is 75% according to the mass ratio. After mixing, it is used as ash raw material. Its chemical composition is: V 2 o 5 1.26%, SiO 2 61.83%, Fe 2 o 3 6.90%, Al 2 o 3 16.58%, CaO 0.30%, MgO 1.31%. The analysis of the occurrence state of vanadium in the ash shows that most of the vanadium occurs in the mica ore, which is a hard-to-leach ore.

[0090] Vanadium pentoxide extraction steps are as follows:

[0091] (1) Acid leaching: add 5mol / L sulfuric acid solution 2364L (this sulfuric acid solution is the high acidity filtrate that step 3 in the embodiment 2 obtains and the sulfuric acid that newly adds is mixed to form) in the acid leaching glass-lined reaction kettle and vanadium-containing 788kg of lime ash residue, heated to 110-115°C and soaked for 4 hours, filtered and washed, a...

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Abstract

The invention provides a method for extracting vanadic oxide from vanadiferous stone coal ash slag through direct acid leaching. The method comprises the following steps: an acid leaching solution obtained by the vanadiferous stone coal ash slag through direct acid leaching is added with ammonium sulphate to prepare tschermigite as a byproduct; a vanadiferous mother solution is added with an iron simple substance and is heated, evaporated, condensed and crystallized to form an intermediate salt crystal in order that vanadium is fully enriched in intermediate salt; the intermediate salt is dissolved to prepare an extractive stock solution; the extractive stock solution is subjected to extraction, back extraction, oxidation and vanadium precipitation to prepare ammonium ployvanadate; and the ammonium ployvanadate is subjected to pyrolysis and deamination to prepare a V2O5 product with purity of over 98 percent. The process is wholly operated in a liquid phase and has no pollution by exhaust gas; waste liquid is basically returned to a system for reclaiming and utilization; the discharged waste liquid is little and is easy to treat; the total reclaiming rate of vanadium can reach over 75 percent; simultaneously, aluminum resource in the ash slag can be reclaimed to form the tschermigite as the byproduct; and the yield of the byproduct can reach dozens to hundreds of times of the yield of the V2O5 product. The process has the advantages of good operating condition, high mechanization and automation degree, high resource utilization rate, low comprehensive cost, good benefit and light pollution.

Description

(1) Technical field [0001] The invention relates to a method for extracting vanadium pentoxide by direct acid leaching of vanadium-containing stone coal ash slag. (2) Background technology [0002] Vanadium is an important strategic material. Humans have discovered vanadium 160 years ago, but it was not until the beginning of the 20th century that it was applied to industrial production. The pure metal vanadium is silver-gray, has good ductility and corrosion resistance. There are many kinds of vanadium products, including metallurgical products such as high-purity metal vanadium, vanadium iron, vanadium aluminum alloy, vanadium carbide and vanadium carbonitride, as well as vanadium pentoxide, ammonium metavanadate, potassium vanadate, sodium vanadate , vanadium hydroxide and vanadium chloride and other chemical products. Because vanadium has the characteristics of high melting point and easy deformation and processing, it is widely used in the fields of iron and steel in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 施正伦岑可法骆仲泱方梦祥高翔王勤辉程乐鸣周劲松余春江王树荣倪明江陈盾
Owner ZHEJIANG UNIV
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