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Method for improving vanadium yield in slag in process of sodium reduction

A technology of vanadium yield and sodiumization, applied in the field of improving the vanadium yield in the slag of the sodium reduction process, can solve problems such as waste of alkali medium

Active Publication Date: 2020-07-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alkali-containing roasting material is directly put into dilute sulfuric acid for leaching, so that the alkali medium is neutralized into sodium sulfate, resulting in a waste of alkali medium

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a method for increasing the yield of vanadium in the slag of the sodium reduction process, the method comprising the following steps:

[0042] (1) Pretreatment is carried out by mixing lye, vanadium-containing minerals and sodium sources to obtain a mixture; the vanadium-containing minerals are vanadium-titanium magnetite; the sodium source is NaOH; the alkali and vanadium in the lye The mass ratio of titano-magnetite is 0.3:1; the mass ratio of the sodium source and the vanadium-containing mineral is 0.2:1; the total mass of the alkali in the lye and the sodium source and the mass ratio of the vanadium-containing mineral are 0.45 : 1; the lye is concentrated before use; the concentration of alkali in the lye after the concentration is 750g / L in terms of sodium hydroxide; the temperature of the pretreatment is 250°C; the time of the pretreatment is 3h;

[0043] (2) carry out sodiumization reduction to the mixed material obtained in step (1) to ...

Embodiment 2

[0047] This embodiment provides a method for increasing the yield of vanadium in the slag of the sodium reduction process, the method comprising the following steps:

[0048] (1) Pretreatment is carried out by mixing lye, vanadium-containing minerals and a sodium source to obtain a mixture; the vanadium-containing minerals include vanadium-titanium iron ore concentrate; the sodium source is Na 2 CO 3 The mass ratio of the alkali in the lye and the vanadium-containing mineral is 0.35:1; the mass ratio of the sodium source and the vanadium-containing mineral is 0.25:1; the total mass sum of the alkali and the sodium source in the lye The mass ratio of vanadium-containing minerals is 0.6:1; the lye is concentrated before use; the concentration of alkali in the lye after concentration is 750g / L in terms of sodium hydroxide; the temperature of the pretreatment is 850°C ; The time of the pretreatment is 1h;

[0049] (2) carry out sodiumization reduction to the mixed material obtai...

Embodiment 3

[0053] This embodiment provides a method for increasing the yield of vanadium in the slag of the sodium reduction process, the method comprising the following steps:

[0054] (1) Pretreatment is carried out by mixing lye, vanadium-containing minerals and sodium sources to obtain a mixture; the vanadium-containing minerals are vanadium-containing iron ore concentrates; the sodium sources are NaOH and Na 2 CO 3 The mass ratio of the alkali in the lye and the vanadium-containing mineral is 0.4:1; the mass ratio of the sodium source and the vanadium-containing mineral is 0.3:1; the total mass sum of the alkali and the sodium source in the lye The mass ratio of vanadium-containing minerals is 0.7:1; the lye is concentrated before use; the concentration of alkali in the lye after concentration is 700g / L in terms of sodium hydroxide; the temperature of the pretreatment is 350°C ; The time of the pretreatment is 2h;

[0055] (2) carry out sodiumization reduction to the mixture obtai...

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PUM

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Abstract

The invention relates to a method for improving vanadium yield in slag in the process of sodium reduction. The method comprises the following steps that (1) mixing pretreatment is conducted on alkaliliquor, vanadium-bearing minerals and sodium sources to obtain a mixture; and (2) sodium reduction is conducted on the mixture obtained in the step (1) to obtain sodium slag, wherein, vanadium extraction is conducted on sodium slag to obtain sodium vanadate, and the alkali liquor is liquid after crystallization produced during sodium vanadate crystallization. By means of the method, recycling, pretreatment and coupling of sodium reduction are conducted on the alkali liquor produced in the process of vanadium extraction to adjust and control the migration and distribution of vanadium in the sodium process, so that more vanadium in the sodium reduction process enters the sodium slag, and the vanadium yield in the slag is increased by more than 20%.

Description

technical field [0001] The invention relates to the field of vanadium extraction, in particular to a method for increasing the yield of vanadium in slag in a sodium reduction process. Background technique [0002] Vanadium and its compounds are important national strategic resources. Due to their unique physical and chemical properties, they are widely used in many fields, most of which are used in the production of high-strength low-alloy steel. Vanadium-titanium magnetite and stone coal are two important vanadium-containing mineral resources. Vanadium-titanium magnetite obtained through blast furnace-converter process, vanadium-containing waste catalyst, vanadium-containing petroleum slag, etc. are also used to extract vanadium. In my country, the sodium roasting method is the mainstream vanadium extraction process, and its process includes steps such as sodium roasting, vanadium extraction by water leaching, solution purification and vanadium precipitation by adding ammon...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/02C22B34/22
CPCC22B1/00C22B1/02C22B34/22
Inventor 孟凡成王丽娜曹磊齐涛陈德胜赵宏欣刘亚辉甄玉兰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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