Method for preparing intermediate salt during acid leaching and extraction of vanadium pentoxide from vanadium-containing stone coal ash

The technology of vanadium pentoxide and intermediate salt is applied in the field of intermediate salt preparation in the process of acid leaching of vanadium-containing stone coal ash residue to extract vanadium pentoxide, can solve the problems of high energy consumption and the like, achieves low labor intensity, simple method, Technologically advanced effects

Inactive Publication Date: 2009-03-11
ZHEJIANG UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

This method of preparing intermediate salt requires high-temperature calcination, which consumes a lot of energy.

Method used

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  • Method for preparing intermediate salt during acid leaching and extraction of vanadium pentoxide from vanadium-containing stone coal ash

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Effect test

Embodiment 1

[0044] Institute of Thermal Engineering, Zhejiang University, direct acid leaching extraction of coal ash slag by intermediate salt method V 2 o 5 Pilot 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

[0065] 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.

[0066] Vanadium pentoxide extraction steps are as follows:

[0067] (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 ut...

Embodiment 3

[0078] 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%, CaO0.30%, MgO1.31%. 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.

[0079] Vanadium pentoxide extraction steps are as follows:

[0080] (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,...

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Abstract

The invention provides a preparation dissolution method for intermediate salt during the process of acid leaching extraction of vanadium pentoxide from vanadium-containing stone coal clinker. The method comprises the following steps: the vanadium-containing stone coal clinker undergoes acid leaching, so as to obtain an acid leaching solution; ammonium sulfate is added into the acid leaching solution to separate out tschermigite, so as to obtain a vanadium-bearing mother liquor as a raw material; the vanadium-containing mother liquor and iron elementary substance are added into a reaction vessel, wherein the mass of the iron elementary substance is 1 to 60 percent of that of the vanadium pentoxide in the vanadium-containing mother liquor; the mixture is stirred for full reaction, and is heated, evaporated and concentrated until the concentration of H<+> in the solution is between 18 and 22 mol per liter; after complete crystallization, the solution is cooled to the room temperature, and filtrate and filter residue are obtained through filtration; and the filter residue is taken, and intermediate salt solid is obtained. The method has the advantages that the method is simple; the operating environment is good; the whole process undergoes full-liquid phase operation; no pollution of toxic waste gas exists; more than 98 percent of vanadium in the mother liquor is enriched into the intermediate salt, thereby greatly simplifying the subsequent extraction operation; and a residual acid after preparation of the intermediate salt can be recovered, thereby greatly reducing the cost.

Description

(1) Technical field [0001] The invention relates to a method for preparing and dissolving an intermediate salt in the process of extracting vanadium pentoxide by acid leaching of coal ash slag containing vanadium. (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, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B7/04C22B3/06C01G31/02
CPCY02P10/20
Inventor 骆仲泱施正伦岑可法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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