Method for preparing high-purity vanadium pentoxide by use of stone coal one-step method

A technology for vanadium pentoxide and stone coal is applied in the field of one-step preparation of high-purity vanadium pentoxide from stone coal, which can solve the problems of high energy consumption, serious pollution, long process and the like.

Active Publication Date: 2017-01-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 sum

Method used

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  • Method for preparing high-purity vanadium pentoxide by use of stone coal one-step method
  • Method for preparing high-purity vanadium pentoxide by use of stone coal one-step method
  • Method for preparing high-purity vanadium pentoxide by use of stone coal one-step method

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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 use of a stone coal one-step method. The technical solution is as follows: a fluidized bed furnace for one-step roasting of stone coal is adopted to perform one-step fluidized bed roasting on the stone coal; roasted materials are leached in three segments, final pickling slurry is subjected to primary separation so as to obtain final pickle liquor, secondary overflow is returned to be subjected to primary size mixing, and tertiary overflow is returned to be subjected to secondary size mixing; the pH value of the final pickle liquor is regulated, and slags obtained after regulation are returned to a segment III so as to be leached; the regulated pickle liquor is crystallized to obtain a potassium alum byproduct; after crystallization, the liquid is subjected to reduction and precipitation-based impurity removal, and filter residues are dried to obtained a ferrous oxalate byproduct; after impurity removal, pH value regulation is performed on the liquid by use of weak acid salt, then counter-current extraction is performed on the liquid, and extraction raffinate is returned to be subjected to tertiary size mixing; after being washed, the loaded organic phase is subjected to countercurrent reverse extraction; a lean organic phase is regenerated and then is returned to be extracted; after a vanadium-rich solution is oxidized, urea is added, stirring is performed, the obtained molybdenum precipitation mother solution is returned to be subjected to primary size mixing, and ammonium polyorthovanadate is calcinated to prepare vanadium pentoxide. The method has the characteristics of short process flow, less pollution, low energy consumption, less chemical usage, 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, JingHuang. The technology of extractin...

Claims

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Application Information

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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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