Process for extracting vanadium from stone coal through two-section curing with concentrated acid

A fossil and concentrated acid technology, applied in the direction of improving process efficiency, etc., can solve problems such as waste of resources, low recovery rate, environmental pollution, etc., and achieve the effects of increasing conversion rate, improving leaching effect, and reducing leaching conditions

Inactive Publication Date: 2011-09-21
北京天瑞利达投资发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic vanadium extraction from stone coal has long used salt-added roasting and leaching technology, which has a low conversion rate of valuable metals (generally no more than 55%), high energy consumption, and serious environmental pollution; since the 1990s, many companies have explored the use of direct acid leaching , alkaline leaching process, but V 2 o 5 The recovery rate is not high (generally only 40% to 60%), the conversion rate of refractory ore is lower, and the problems of waste of resources and environmental pollution have not been fundamentally resolved
[0005] It can be seen that the existing stone coal vanadium extraction process obviously has obvious technical defects and environmental pollution, which needs to be improved urgently
In order to solve the existing problems of vanadium extraction from stone coal, many related companies are scrambling to develop a new vanadium extraction process from stone coal, but so far no new vanadium extraction process from stone coal that is truly clean, environmentally friendly, and has a high conversion rate of valuable metals has been used in industrial production

Method used

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  • Process for extracting vanadium from stone coal through two-section curing with concentrated acid
  • Process for extracting vanadium from stone coal through two-section curing with concentrated acid
  • Process for extracting vanadium from stone coal through two-section curing with concentrated acid

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Experimental program
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Effect test

Embodiment 1

[0049] Conventional experimental methods, such as X-fluorescence measurement, measure the grade of vanadium in the stone coal used in this embodiment to be 0.89%.

[0050] Grinding the above-mentioned stone coal 100g to be larger than 60 meshes, and mixing in 23% sulfuric acid with a concentration of 98%. Add water, control the liquid-solid ratio to 0.5, and stir evenly. One-stage aging at 50°C for 1 hour; second-stage aging at 120°C for 1.5 hours. Add water with a solid-to-liquid ratio of 2:1 to the solid obtained after the second-stage aging, then soak at 70° C. for 1 hour, filter, and wash with acidic warm water to obtain vanadium-containing leaching solution and leaching residue.

[0051] The ferrous ammonium sulfate solution with a concentration of 4 g / L was titrated in the vanadium-containing leaching solution, and the vanadium leaching rate was measured according to the conventional analytical chemical calculation method. The results are shown in Table 1.

Embodiment 2

[0053] The stone coal 100g identical with embodiment 1 is pulverized to more than 60 orders, and the sulfuric acid that the concentration that stirs in consumption is 17% is 98%. Add water, control the liquid-solid ratio to 0.5, and stir evenly. One-stage aging at 50°C for 1 hour; second-stage aging at 120°C for 1.5 hours. Add water with a solid-to-liquid ratio of 2:1 to the solid obtained after the second-stage aging, then soak at 70° C. for 1 hour, filter, and wash with acidic warm water to obtain vanadium-containing leaching solution and leaching residue.

[0054] Using the ferrous ammonium sulfate titration method as in Example 1, the vanadium leaching rate was measured, and the obtained results are shown in Table 1.

Embodiment 3

[0056] The stone coal 100g identical with embodiment 1 is pulverized to more than 60 orders, and the concentration that mixes in consumption is 23% is the sulfuric acid of 98%. Add water, control the liquid-solid ratio to 0.5, and stir evenly. One-stage aging at 70°C for 1 hour; second-stage aging at 100°C for 3 hours. Add water with a solid-to-liquid ratio of 2:1 to the solid obtained after the second-stage aging, then soak at 70° C. for 1 hour, filter, and wash with acidic warm water to obtain vanadium-containing leaching solution and leaching residue.

[0057] Using the ferrous ammonium sulfate titration method as in Example 1, the vanadium leaching rate was measured, and the obtained results are shown in Table 1.

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Abstract

The invention relates to a process for extracting vanadium from stone coal through two-section curing with concentrated acid. The process flow mainly comprises the following steps of: a), adding concentrated sulfuric acid into the vanadium-containing stone coal, and uniformly stirring; b), performing one-section curing on the mixture of the concentrated sulfuric acid and the vanadium-containing stone coal at the temperature of at least 50 DEG C; and c), performing second-section curing on the mixture subjected to the one-section curing at the temperature of at least 100 DEG C. The process has high conversion rate, saves mineral resources and has high adaptability.

Description

technical field [0001] The invention relates to a process for extracting vanadium from stone coal, in particular to a process for extracting vanadium pentoxide from stone coal by using a second-stage curing process of concentrated sulfuric acid. Background technique [0002] Stone coal is a highly metamorphic sapropel peat or algal coal. Formed in the Early Proterozoic and Early Paleozoic, most of them have the characteristics of high ash, high sulfur, low calorific value and high hardness. In addition to organic carbon, its composition also includes silicon oxide, calcium oxide and a small amount of iron oxide, aluminum oxide and magnesium oxide. [0003] There are various classifications of stone coal. According to ash content and calorific value, it can be divided into general stone coal and high-quality stone coal: the ash content of general stone coal is 40% to 90%, and the calorific value is below 16.7 kJ / g; the ash content of high-quality stone coal is 20% to 40%. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/08
CPCY02P10/20
Inventor 胡嘉杨道印吴振祥
Owner 北京天瑞利达投资发展有限公司
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