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 problems such as difficult popularization and use, and inconvenient operation

Inactive Publication Date: 2009-12-09
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

[0009] Example 1 Take V 2 o 5 Vanadium-containing stone coal ore with a grade of 1.05%, crush the stone coal ore to a particle size of less than 2mm, sample 2000g and roast it in industrial microwave equipment at a roasting temperature of 700°C for 1 hour; after roasting, finely grind the clinker until 100% is less than 0.15 mm, add water to make slurry, make the liquid-solid ratio (volume to mass ratio) 1.5:1, add sulfuric acid to carry out vanadium pentoxide leaching, the amount of sulfuric acid is 22% of the stone coal ore quality, the temperature of the leaching process is 95 ℃, and the leaching time is 6h , V 2 o 5 The leaching rate can reach 83.5%. Iron powder is used to reduce ferric ions in the leachate, and the pH value is adjusted to 2.8-3.0 with lime and ammonia water. After solvent extraction, oxidation, and ammonia water are added, ammonium polyvanadate is precipitated, and ammonium polyvanadate is calcined to prepare powder V 2 o 5 product, V 2 o 5 The rec...

Embodiment 2

[0010] Example 2 Take V 2 o 5 For vanadium-containing stone coal ore with a grade of 0.87%, the stone coal ore is crushed to a particle size of less than 2mm, and a sample of 2000g is roasted in industrial microwave equipment at a roasting temperature of 750°C for 1.5 hours; after roasting, the clinker is finely ground to 100% less than 0.15mm, add water to make slurry, make the liquid-solid ratio (volume to mass ratio) 1:1, add sulfuric acid to carry out vanadium pentoxide leaching, sulfuric acid dosage is 24% of stone coal ore quality, leaching process temperature 95 ℃, leaching time 8h, V 2 o 5 The leaching rate can reach 82.0%. Iron powder is used to reduce ferric ions in the leachate, and the pH value is adjusted to 2.8-3.0 with lime and ammonia water. After solvent extraction, oxidation, and ammonia water are added, ammonium polyvanadate is precipitated, 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 less than 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 Applications(China)
IPC IPC(8): C22B34/22C22B1/02C22B3/08C22B3/46
CPCY02P10/20
Inventor 田学达张小云
Owner XIANGTAN UNIV
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