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Clean manufacturing technique of extracting vanadium pentoxide from vanadium-contained stone coal

A vanadium pentoxide and clean production technology, which is applied in the field of clean production technology for extracting vanadium pentoxide, can solve the problems of inconvenient operation and difficult promotion and use, and achieve high leaching rate and recovery rate

Inactive Publication Date: 2011-06-15
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Journal of Nonferrous Metals of China" (2008, 18 (9)) disclosed the stone coal microwave roasting-acid leaching process, because the alkaline additive Na 2 CO 3 , the roasted clinker must be leached in two stages of water leaching and acid leaching, which is not easy to operate and is not easy to promote and use in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1 takes V 2 O 5 A grade of 1.05% vanadium-containing rock ore, crush the quarry to a particle size of less than 2mm, sample 2000g and roast in an industrial microwave equipment, roasting temperature 700℃, roasting time 1h; after roasting, finely grind the clinker to 100% less than 0.15 mm, add water to make a slurry, make the liquid-solid ratio (volume to mass ratio) 1.5:1, add sulfuric acid for leaching of vanadium pentoxide, the amount of sulfuric acid is 22% of the mass of the stone coal, the leaching process temperature is 95℃, and the leaching time is 6h , V 2 O 5 The leaching rate can reach 83.5%. The leaching solution is reduced by iron powder to ferric ions, adjusted to pH 2.8-3.0 with lime and ammonia, and then extracted by solvent, oxidized, and added with ammonia to obtain ammonium polyvanadate precipitation, which is calcined to prepare powder V 2 O 5 Product, V 2 O 5 The recovery rate was 76.50%.

Embodiment 2

[0011] Example 2 Take V 2 O 5 The vanadium-containing ore with a grade of 0.87%, the quarry is pulverized to a particle size of less than 2mm, and 2000g is sampled and roasted in an industrial microwave equipment. The roasting temperature is 750℃ and the roasting time is 1.5h; after roasting, the clinker is finely ground to 100% less than 0.15mm, add water to make a slurry, make the liquid-solid ratio (volume to mass ratio) 1:1, add sulfuric acid to leaching vanadium pentoxide, the amount of sulfuric acid is 24% of the mass of the stone coal, the leaching process temperature is 95℃, and the leaching time 8h, V 2 O 5 The leaching rate can reach 82.0%. The leaching solution is reduced with iron powder to ferric ions, adjusted to pH 2.8-3.0 with lime and ammonia, and then extracted with solvent, oxidized, and added with ammonia to obtain ammonium polyvanadate precipitation, and ammonium polyvanadate is calcined to prepare powder V 2 O 5 Product, V 2 O 5 The recovery rate was 75.0%....

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Abstract

The invention discloses a clean manufacturing technique of extracting vanadium pentoxide from vanadium-contained stone coal, comprising the following steps: grinding the vanadium-contained stone coal until the granularity is less than 2mm, baking in the industrial microwave device at temperature of 700 to 800 DEG C for 1h to 2h, fine grinding the clinker after baking until the granularity is lessthan 0.15mm, adding water to prepare ore slurry, in which the volume mass ratio of water to vanadium-contained stone coal is 1-1.5 to 1, adding sulphuric acid to leach at temperature of 80 to 95 DEG C for 2h to 20h, in which the amount of sulphuric acid is 10% to 25% of vanadium-contained stone coal, adding ferrous powder in the extract to reduce ferric ion, adjusting the pH value with lime and ammonia water to be 2.8 to 3.0, and obtaining ammonium polyvanadate precipitate after solvent extraction, oxidization and adding ammonia water. The ammonium polyvanadate is calcined to prepare powdery vanadium pentoxide product. The invention has beneficial effects of 1. effectively breaking structures of minerals such as vanadium-contained mica and kaolin by using microwave device to roast the vanadium-contained stone coal; 2. compared with stone coal direct acid leaching technique, reducing sulphuric acid amount by 10% to 15%, as the sulphuric acid amount when acid leaching is 10% to 25% of mineral mass; and 3. without any additive in the baking process or air pollution, belonging to clean manufacturing technique.

Description

technical field [0001] The invention relates to a clean production process for extracting vanadium pentoxide from vanadium-containing stone coal mines. Background technique [0002] Vanadium-bearing stone coal mine is the main vanadium-containing resource exploited as a single vanadium deposit in my country, V 2 o 5 The grade is low, generally around 1.0%. The vanadium in stone coal is mainly V(III), some V(IV), and rarely V(V). Since the ionic radius (74pm) of V(III) is equal to that of Fe(II) (74pm), and is also very close to the ionic radius (64pm) of Fe(III), V(III) hardly generates its own Minerals, but exist in the silicon-oxygen tetrahedral structure of iron-aluminum minerals such as vanadium-containing mica and kaolinite in the form of isomorphism. Vanadium in stone coal can only be transformed into soluble pentavalent vanadium under the action of high temperature and additives. my country began to study the extraction of vanadium from stone coal in the 1960s, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B1/02C22B3/08C22B3/46
CPCY02P10/20
Inventor 田学达张小云
Owner XIANGTAN UNIV