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A method for preparing high-purity vanadium pentoxide by one-step method from stone coal

A technology of vanadium pentoxide and stone coal, which is applied in the field of one-step preparation of high-purity vanadium pentoxide from stone coal, and can solve problems such as low production efficiency, low product purity, and low vanadium recovery rate

Active Publication Date: 2018-01-23
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this process can obtain a recovery rate of 85% vanadium in a relatively short period of time, the process consumes a lot of energy, requires high equipment, and the purity of the product obtained by this process is not high.
[0007] In summary, the existing stone coal vanadium extraction process still has problems such as long process, serious pollution, high energy consumption, large dosage of chemicals, low production efficiency, low vanadium recovery rate and low product purity.

Method used

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  • A method for preparing high-purity vanadium pentoxide by one-step method from stone coal
  • A method for preparing high-purity vanadium pentoxide by one-step method from stone coal
  • A method for preparing high-purity vanadium pentoxide by one-step method from stone coal

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Embodiment 1

[0089] The invention discloses a method for preparing high-purity vanadium pentoxide by one-step method from stone coal. The specific steps of the method described in this embodiment are as follows:

[0090] Step 1, one-step boiling roasting of stone coal

[0091] Step 1.1, the equipment adopted in the one-step boiling roasting of stone coal is "a fluidized fluidized furnace for one-step roasting of stone coal", and the specific structure is:

[0092] Near the bottom of the furnace body 10, a first fluidized bed 1, a second fluidized bed 2 and a third fluidized bed 14 are sequentially arranged from left to right, and the first fluidized bed 1 and the second fluidized bed 2 are formed by the first fluidized bed The fire wall 11 separates, the second fluidized bed 2 and the third fluidized bed 14 are separated by the second fire wall 12, the first air chamber 17 and the second air chamber 16 are separated by the first fire wall 11, the second The air chamber 16 and the third a...

Embodiment 2

[0134] The invention discloses a method for preparing high-purity vanadium pentoxide by one-step method from stone coal. The specific steps of the method described in this embodiment are as follows:

[0135] Step 1, one-step boiling roasting of stone coal

[0136] Step 1.1 is the same as step 1.1 in Example 1.

[0137] Step 1.2, one-step boiling roasting method of stone coal

[0138] The stone coal is crushed until the particle size is less than or equal to 15mm, and the stone coal crushed material is obtained. Turn on the fourth fan 6, adjust the wind speed of the tuyere 7 to 11-13m / s, and feed the stone coal crushed material into the furnace body 10 through the feed port 8 at a rate of 90-120kg / h. More than 90% of the stone coal crushed material with a particle size greater than 8mm and less than or equal to 15mm falls into the first fluidized bed 1, and more than 90% of the stone coal crushed material with a particle size greater than 3mm and less than or equal to 8mm fa...

Embodiment 3

[0170]The invention discloses a method for preparing high-purity vanadium pentoxide by one-step method from stone coal. The specific steps of the method described in this embodiment are as follows:

[0171] Step 1, one-step boiling roasting of stone coal

[0172] Step 1.1 is the same as step 1.1 in Example 1.

[0173] Step 1.2, one-step boiling roasting method of stone coal

[0174] The stone coal is crushed until the particle size is less than or equal to 15mm, and the stone coal crushed material is obtained. Turn on the fourth fan 6, adjust the wind speed of the tuyere 7 to 13-15m / s, and simultaneously feed the stone coal crushed material into the furnace body 10 through the feeding port 8, and the feeding amount is 120-150kg / h. More than 90% of the stone coal crushed material with a particle size greater than 8mm and less than or equal to 15mm falls into the first fluidized bed 1, and more than 90% of the stone coal crushed material with a particle size greater than 3mm ...

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Abstract

The invention relates to a method for preparing high-purity vanadium pentoxide by one-step method from stone coal. Its technical plan is: use "fluidized fluidized furnace for one-step roasting of stone coal" to roast the stone coal by one-step boiling; the roasted material is leached in three stages, the final acid leaching slurry is separated in the first stage to obtain the final acid leaching liquid, and the secondary overflow returns to a conditioning Slurry, the third-stage overflow returns to the second pulping; adjust the pH value of the final acid leaching solution, and the slag after adjustment is returned to stage III for leaching; the acid leaching solution after adjustment is crystallized to obtain potassium alum by-products, and the liquid after crystallization is reduced and precipitated to remove impurities, and the residue is filtered Dried to obtain ferrous oxalate by-product; the impurity-removed liquid is adjusted by weak acid salt and then extracted countercurrently, the raffinate is returned to the slurry for three times, the loaded organic phase is washed and back-extracted countercurrently, and the lean organic phase is regenerated and then returned to extraction; vanadium-rich After the solution is oxidized, add urea and stir, the obtained vanadium precipitation mother solution is returned to a slurry adjustment, and the ammonium polyvanadate is calcined to obtain vanadium pentoxide. The invention has the characteristics of short process flow, less pollution, low energy consumption, less medicament consumption, high vanadium recovery rate and high product purity.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. Specifically, it relates to a method for preparing high-purity vanadium pentoxide by one-step method from stone coal. Background technique [0002] Stone coal is an important vanadium-containing resource unique to my country. With the in-depth research and practice of scientific and technological workers for decades, the extraction of vanadium from stone coal has become one of the main ways for my country to obtain vanadium, an important strategic resource. The process of vanadium extraction from stone coal mainly includes roasting, leaching, purification and enrichment, vanadium precipitation, and calcination to produce vanadium pentoxide. At present, the relatively mature and practically applied stone coal vanadium extraction processes include: [0003] (1) Yi-Min Zhang et al. (Yi-Min Zhang, Shen-Xu Bao, Tao Liu, Tie-Jun Chen, Jing Huang. The technology of extracti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/10C22B3/08C22B3/02C22B3/22C22B3/44C22B34/22C22B3/38C22B3/28
CPCC22B1/10C22B3/02C22B3/08C22B3/22C22B3/44C22B34/22C22B3/28C22B3/37Y02P10/20
Inventor 张一敏袁益忠刘涛黄晶包申旭陈铁军
Owner WUHAN UNIV OF SCI & TECH
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