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Method for co-extracting vanadium, titanium and chromium from vanadium slag

A vanadium slag and vanadium-titanium technology, applied in the field of metallurgical slag resource utilization, can solve the problems of inability to realize titanium and chromium extraction, tailing slag toxicity, titanium and chromium cannot be extracted together, etc.

Active Publication Date: 2021-08-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process generally has the following problems: the process is complicated, and high-temperature roasting (850°C) is required to extract vanadium; this process can only extract vanadium, but not titanium and chromium, and the recovery rate of vanadium is low. Less than 80%; the "three wastes" problem caused by this process is relatively serious
However, the process generally has the following problems: the process is complicated, and high-temperature roasting (850°C) is required to extract vanadium; The problem of waste gas and waste water produced by sodium roasting has been eliminated, but the problem that titanium and chromium cannot be extracted together still exists, and the tailings are toxic
However, this method needs to be carried out under the conditions of high temperature, high pressure and high acidity, which requires high equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take 5g of vanadium slag, put it into a high-temperature tube furnace, the reaction conditions are hydrogen flow rate 100mL / min, the reaction temperature is 700°C, the holding time is 80min, and cool to room temperature with the furnace;

[0025] (2) Take 2g of hydrogen-reduced vanadium slag, put it into the reaction kettle together with 20mL ferric chloride solution with a concentration of 500g / L, set the leaching temperature to 60°C, the leaching time to 40min, and the stirring speed to 400r / min , after the reaction is finished, filter, wash and dry.

[0026] (3) Take 1.5g of vanadium slag after iron removal, 1.48g of oxalic acid, and 15mL of deionized water, mix them into a slurry, and add them to the reactor. The reaction temperature is 75°C, the reaction time is 60min, and the reaction pressure is 0.02MPa. , the stirring speed is 300r / min, after the reaction is completed, cool to room temperature, filter and wash to obtain the vanadium, titanium, chromium leach...

Embodiment 2

[0029] (1) Get 5g of vanadium slag, put it into a high-temperature tube furnace, add 18% carbon powder, the reaction temperature is 800°C, the holding time is 100min, and cool to room temperature with the furnace;

[0030] (2) Take 2g of reduced vanadium slag, put it into the reactor together with 20mL of ferric chloride solution with a concentration of 600g / L, set the leaching time to 60min, and the stirring speed to 500r / min. After the reaction is completed, filter , washing, drying;

[0031] (3) Take 1g of vanadium slag after iron removal, 1.11g of oxalic acid, and 10mL of deionized water, mix them into a slurry, and add them to the reactor. The reaction temperature is 85°C, the reaction time is 60min, and the reaction pressure is 0.03MPa. The stirring speed is 300r / min. After the reaction is completed, it is cooled to room temperature, filtered and washed to obtain vanadium, titanium and chromium leaching solution and leaching residue.

[0032] The experimental results sh...

Embodiment 3

[0034] (1) Take 5g of vanadium slag, put it into a high-temperature tube furnace, the carbon monoxide flow rate is 100mL / min, the reaction temperature is 900°C, the holding time is 120min, and cool to room temperature with the furnace;

[0035] (2) Take 2g of reduced vanadium slag, put it into the reaction kettle together with 20mL of ferric chloride solution with a concentration of 500g / L, set the leaching time to 60min, and the stirring speed to 500r / min. After the reaction is completed, filter , washing, drying;

[0036] (3) Take 1g of vanadium slag after iron removal, 1.76g of oxalic acid, and 10mL of deionized water, mix them into a slurry, and add them to the reactor. The reaction temperature is 100°C, the reaction time is 60min, and the reaction pressure is 0.1MPa. The stirring speed is 400r / min. After the reaction is completed, it is cooled to room temperature, filtered and washed to obtain vanadium, titanium and chromium leaching solution and leaching residue.

[003...

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Abstract

The invention provides a method for co-extracting vanadium, titanium and chromium from vanadium slag. According to the method, pyroxene and fayalite wrapping spinel are selectively reduced through a method of low-temperature hydrogen reduction, iron removal by ferric trichloride and low-temperature oxalic acid leaching of the vanadium slag, the structure of the spinel is destroyed, and dissociation of a spinel phase and a silicate phase is realized, so that the spinel phase is fully exposed, the vanadium slag is directly leached at a low temperature and the spinel structure is destroyed by utilizing the acidity and strong complexing property of oxalic acid, so that vanadium, titanium and chromium are complexed with oxalate to enter a solution, and co-extraction of vanadium, titanium and chromium is realized. According to the method, vanadium, titanium and chromium are extracted from the vanadium slag, and the leaching rates are all larger than 99%.

Description

technical field [0001] The invention relates to the technical field of resource utilization of metallurgical slag, in particular to a method for co-extracting vanadium, titanium and chromium from vanadium slag. Background technique [0002] Vanadium slag is a by-product of vanadium-titanium magnetite smelting, which contains rich rare metal elements, such as vanadium, titanium, chromium and so on. At present, vanadium slag is only used for vanadium extraction, and the main processes used are sodium roasting-water extraction and calcification roasting-acid leaching vanadium extraction process. [0003] The sodium roasting-water leaching vanadium extraction process mainly includes the following processes: sodium roasting process, water immersion process, solution purification process and ammonium salt vanadium precipitation process. However, this process generally has the following problems: the process is complicated, and high-temperature roasting (850°C) is required to extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/00C22B34/12C22B34/22C22B34/32
CPCC22B7/04C22B7/007C22B1/005C22B34/22C22B34/124C22B34/32Y02P10/20C22B7/002C22B3/165C22B3/06C22B34/1259C22B34/1213C22B34/1281C22B34/1286
Inventor 闫柏军董自慧张杰
Owner UNIV OF SCI & TECH BEIJING
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