Method for extracting vanadium by decarburization-crystal breaking roasting and reinforced acid leaching from vanadium-containing stone coal

An acid leaching and decarbonization technology, applied in the field of vanadium extraction from stone coal, can solve the problems of poor oxidation uniformity of the inner and outer layers of pellets, sulfur pollution in tail gas, and small processing capacity, so as to improve the effect of crystal breaking and oxidation, and improve The effect of acid leaching rate

Active Publication Date: 2020-06-19
NORTHEASTERN UNIV
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Problems solved by technology

As an important vanadium-containing resource, stone coal has huge reserves. Due to the complex and changeable mineral composition in stone coal, the occurrence states of vanadium in stone coal are different, which has also led to the fact that vanadium-containing stone coal has not yet Efficient utilization; therefore, how to realize the effective extraction of vanadium resources in stone coal is of great significance to alleviate the shortage of vanadium resources in my country
[0003] Patent CN 103952538 A relates to a roasting method for stone coal vanadium ore raising material, adjusting air and supplementing heat. It is proposed to add material raising, air supplementing and heat supplementing devices to the conventional rotary kiln to improve the roasting effect of stone coal, but the rotary kiln still exists Disadvantages such as easy under-burning or over-burning, low energy utilization

Method used

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  • Method for extracting vanadium by decarburization-crystal breaking roasting and reinforced acid leaching from vanadium-containing stone coal
  • Method for extracting vanadium by decarburization-crystal breaking roasting and reinforced acid leaching from vanadium-containing stone coal
  • Method for extracting vanadium by decarburization-crystal breaking roasting and reinforced acid leaching from vanadium-containing stone coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Process such as figure 1 shown;

[0043] The vanadium-containing stone coal block contains V by mass percentage 2 o 5 1.21%, C 11.87%, TFe 2.69%, SiO 258.33%; crush the vanadium-containing stone coal block with a particle size of 10-200mm to 2-10mm to make stone coal ore particles; grind the stone coal ore particles to -0.074mm with a mass content of 60% to make stone coal ore powder ;

[0044] A suspension roasting device with a combustion station at the bottom and an induced draft fan on the top is adopted; when the induced draft fan is turned on, air and gas are introduced into the combustion station for combustion to generate hot flue gas, which then enters the suspension roasting device; at the same time, the stone coal mine The powder is transported to the suspension roasting device, and the stone coal ore powder enters from the upper part of the suspension roasting device; the stone coal ore powder is in a suspended state under negative pressure under the ac...

Embodiment 2

[0049] Method is with embodiment 1, and difference is:

[0050] (1) Vanadium-containing stone coal blocks contain V by mass percentage 2 o 5 0.95%, C 17.17%, TFe 6.51%, SiO 2 52.13%; the mass content of the part that grinds stone coal ore particles to -0.074mm is 80%;

[0051] (2) Stone coal powder is roasted at 800°C with heat storage; the residence time of stone coal powder in the suspension roasting device is 60s;

[0052] (3) The regenerative stone coal powder is decarburized and roasted at a temperature of 600°C, and the residence time in the decarburized roasting device is 26 minutes;

[0053] (4) In the mixed gas introduced in the crystal-breaking roasting device, the volume ratio of air and nitrogen is 2.5, the temperature of the decarburized material is controlled at 800°C, and the residence time of the decarburized material in the crystal-breaking roasting device is 50min;

[0054] (5) When acid leaching, the mass concentration of sulfuric acid solution is 30%, ...

Embodiment 3

[0056] Method is with embodiment 1, and difference is:

[0057] (1) Vanadium-containing stone coal blocks contain V by mass percentage 2 o 5 1.1%, C 13.2%, TFe 3.4%, SiO 2 54.6%; the mass content of the part that grinds stone coal ore particles to -0.038mm is 90% to make stone coal ore powder;

[0058] (2) Thermal storage roasting of stone coal powder at 850°C; the residence time of stone coal powder in the suspension roasting device is 40s;

[0059] (3) The regenerative stone coal powder is decarburized and roasted at a temperature of 850°C, and the residence time in the decarburized roasting device is 22 minutes;

[0060] (4) In the mixed gas introduced in the crystal-breaking roasting device, the volume ratio of air and nitrogen is 2.5, the temperature of the decarburized material is controlled at 850°C, and the residence time of the decarburized material in the crystal-breaking roasting device is 40min;

[0061] (5) When acid leaching, the mass concentration of sulfur...

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Abstract

The invention discloses a method for extracting vanadium by decarburization-crystal breaking roasting and reinforced acid leaching from vanadium-containing stone coal. The method comprises the following steps that (1) a vanadium-containing stone coal block body is crushed and ground to obtain stone coal mine powder; (2) hot flue gas is fed into a suspension roasting device, and the coal mine powder is conveyed into the suspension roasting device, is suspended under the action of the high-temperature air flow, and is discharged after heat storage roasting at the temperature of 700-900 DEG C; (3) the coal mine powder is conveyed to a decarburization roasting device, air is fed to suspend the heat-storage stone coal mine powder, decarbonizing roasting is carried out at the temperature of 500-800 DEG C, and a decarburized material is discharged; (4) a mixed gas of air and nitrogen is fed into a crystal breaking roasting device, the decarburized material is conveyed to the crystal breakingroasting device for suspension, an oxidation reaction is performed at the temperature of 750-900 DEG C, and a crystal-breaking roasting material is discharged; and (5) vanadium is extracted by acid leaching in a sulfuric acid solution. The method is simple in process flow, uniform in product property, large in equipment processing amount, efficient, energy-saving and environment-friendly, and large-scale production is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. Specifically, it relates to a method for vanadium-containing stone coal decarburization-crystal-breaking roasting and enhanced acid leaching for vanadium extraction. Background technique [0002] As an important strategic substance, vanadium is widely used in various industries. With the development of iron and steel industry, the consumption of vanadium as an important additive continues to increase, which makes vanadium resources increasingly tight. As an important vanadium-containing resource, stone coal has huge reserves. Due to the complex and changeable mineral composition in stone coal, the occurrence states of vanadium in stone coal are different, which has also led to the fact that vanadium-containing stone coal has not yet Efficient utilization; therefore, how to realize the effective extraction of vanadium resources in stone coal is of great significance to ...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B1/10C22B1/02C22B3/08
CPCC22B1/02C22B1/10C22B3/08C22B34/22Y02P10/20
Inventor 袁帅李艳军白哲韩跃新高鹏孙永升
Owner NORTHEASTERN UNIV
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