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A method for strengthening the calcification of converter vanadium slag to extract vanadium

A converter vanadium slag and vanadium slag technology, applied in the field of metallurgy, can solve the problems of low vanadium leaching rate and reduced production efficiency in the calcification vanadium extraction process, and achieve the advantages of mature mechanical activation strengthening process, improved leaching rate, and improved oxidative roasting efficiency. Effect

Active Publication Date: 2017-10-20
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The calcification vanadium extraction method is a clean production process that can replace the traditional sodium vanadium extraction method, but basic research and industrial practice point out that the low vanadium leaching rate of the calcification vanadium extraction process has become a limitation for it to completely replace the sodium vanadium extraction process. Achilles' heel
The effect of calcification roasting directly affects the rate of vanadium leaching. Although increasing the roasting temperature can improve the rate and efficiency of roasting, increasing the roasting temperature of the rotary kiln will easily cause the sintering of raw materials to form rings and reduce production efficiency.

Method used

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  • A method for strengthening the calcification of converter vanadium slag to extract vanadium
  • A method for strengthening the calcification of converter vanadium slag to extract vanadium
  • A method for strengthening the calcification of converter vanadium slag to extract vanadium

Examples

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Effect test

Embodiment 1

[0031] A method for strengthening the calcification of converter vanadium slag to extract vanadium, referring to figure 1 The shown technological process includes the following steps:

[0032] 1) The vanadium-containing slag after industrial iron selection is used as raw material, crushed and screened in a ball mill or pulverizer until the particle size is less than 125 microns, and then magnetically separated by a dry-type magnetic separator to obtain a vanadium slag fine powder. The vanadium slag fine powder particle size Distributed at 1.7-125 microns, the average particle size is 46 microns, and the specific surface area is about 0.2m 2 / g. .

[0033] 2) Put the fine powder of vanadium slag obtained in step 1) into a high-energy ball mill. According to the mass ratio of material to ball 5:1, the speed of the ball mill is 400rpm, and the ball mill is 80min to obtain activated vanadium slag. The particle size distribution of activated vanadium slag is 0.04-45 microns, the...

Embodiment 2 to 10

[0039] The same method as in Example 1 was adopted, except that the ball milling time in step 2) was different and the calcination temperature in step 4) was different. The ball milling and roasting parameters and leaching effects of Examples 2 to 10 are shown in Table 1 in detail. The thermogravimetric curves of isothermal oxidation roasting of unmilled vanadium slag fine powder mixed with calcium mixture and 80min ball milled activated vanadium slag mixed with calcium mixture are as follows figure 2 and image 3 shown.

[0040] Ball milling, roasting parameters and leaching rate of table 1 embodiment 2 to 10

[0041]

Ball milling time (min)

Calcination temperature (℃)

Roasting time (min)

Leaching rate (%)

Example 2

80

750

60

79.60

Example 3

80

850

60

86.32

Example 4

80

900

60

81.68

Example 5

40

800

60

91.25

Example 6

20

800

60

90.40

Example 7

...

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Abstract

The invention discloses a method for strengthening vanadium extraction from vanadium slags of a converter through calcification. The method comprises the following steps of crushing vanadium-containing slags which are used as raw materials after industrial iron separation, and then performing magnetic separation so as to obtain fine vanadium slag powder; then performing ball milling and activation on the fine vanadium slag powder so as to obtain activated vanadium slags; then adding powdery calcium-containing compound powder to the activated vanadium slags in a matching manner, and performing uniform mixing so as to obtain calcium matching mixed materials; then performing oxidizing roast on the calcium matching mixed materials in an oxidizing roaster, and then performing air cooling and crushing so as to obtain roasted clinker; and leaching the roasted clinker in a weak acid solution so as to obtain a vanadium-containing leaching solution, wherein the vanadium-containing leaching solution is used for subsequent purification and vanadium extraction. Through the adoption of the method disclosed by the invention, the oxidizing roast temperature of the vanadium slags of the converter can be reduced, and the leaching rate of vanadium in the roasted clinker is increased.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for strengthening the calcification of converter vanadium slag to extract vanadium. Background technique [0002] Vanadium is an important strategic material, known as "the monosodium glutamate of modern industry", and is widely used in many fields such as iron and steel industry, chemical industry, aerospace industry, light textile industry and medicine. About 87% of vanadium is used in the steel industry. [0003] At present, more than 90% of the production of metal vanadium or vanadium-iron alloy in my country is produced with vanadium-titanium magnetite as raw material. In China, vanadium-titanium magnetite is mainly used as raw material, and ordinary steel and vanadium slag are produced by blast furnace-converter dual process. The most mature process for extracting vanadium pentoxide from vanadium-containing slag is sodium vanadium extraction. Sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/02C22B34/22
CPCC22B1/02C22B7/007C22B7/04C22B34/22Y02P10/20
Inventor 吕学伟向俊一黄青云白晨光
Owner CHONGQING UNIV
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