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Method for leaching vanadium from vanadous stone coal ore with fluosilicic acid and sulphuric acid

A technology of fluosilicic acid and vanadium stone, which is applied in the field of vanadium leaching, can solve problems such as market instability, and achieve the effect of saving sulfuric acid consumption and high leaching rate

Inactive Publication Date: 2010-01-13
长沙达华矿业技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And Na 2 SiF 6 the market is very unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1 gets vanadium grade (with V 2 o 5 1.05% vanadium-containing stone coal ore, crushing and wet grinding until the particle size is less than 0.15mm, the volume-to-mass ratio of water in the slurry obtained by grinding to vanadium-containing stone coal ore is 1.5:1, and the added mass concentration is 15% The by-product fluosilicic acid and industrial sulfuric acid produced by the deep processing of apatite ore are used for vanadium leaching, and the amount of by-product fluosilicic acid (calculated on the basis of 100% mass concentration of fluosilicic acid) is 10% of the mass of vanadium-containing stone coal mines , the mass concentration is that the industrial sulfuric acid consumption of 95% is 22% of the vanadium-containing stone coal mine quality, leaching process temperature 90 ℃ ± 5 ℃, leaching time 4h, obtain vanadium-containing leaching solution through liquid-solid separation after leaching, vanadium leaching rate (in V 2 o 5 Total) is 87.5%. Ir...

Embodiment 2

[0011] Embodiment 2 gets vanadium grade (with V 2 o 5 0.87% vanadium-containing stone coal ore, crushing and wet grinding until the particle size is less than 0.15mm, the volume-to-mass ratio of water in the slurry obtained by grinding to vanadium-containing stone coal ore is 1.25:1, and the added mass concentration is 30% Industrial-grade fluorosilicic acid and industrial-grade sulfuric acid are used for leaching of vanadium. The amount of fluorosilicic acid (calculated on the basis of 100% mass concentration of fluorosilicic acid) is 8% of the quality of the vanadium-containing stone coal mine, and the amount of industrial sulfuric acid with a mass concentration of 95% It is 25% of the quality of the vanadium-containing stone coal mine, the temperature of the leaching process is 90°C ± 5°C, and the leaching time is 8h. After leaching, the vanadium-containing leachate is obtained through liquid-solid separation. The vanadium leaching rate (in V 2 o 5 Calculated) is 90.0%. ...

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Abstract

The invention discloses a method for leaching vanadium from vanadous stone coal ore with fluosilicic acid and sulphuric acid, comprising the following steps: smashing and wet grinding the vanadous stone coal ore so that granularity is less than 0.15mm; adding fluosilicic acid of which dosage is 5-15% of the vanadous stone coal ore by weight percent and is calculated with 100% of fluosilicic acid by weight percent and sulphuric acid of which dosage is 10-25% of the ore by weight percent to leach vanadium at 80-95 DEG C for 2-20 hours; obtaining vanadium-containing leaching liquor by liquid-solid separation after leaching; reducing ferric ion with iron powder; adjusting the pH value to 2.8-3.0 with lime and ammonia; extracting with solvent; oxidizing; adding ammonia to obtain ammonium polyvanadate precipitate; and calcining ammonium polyvanadate to prepare powdered vanadium pentoxide product; wherein, the ratio of the volume of the water in the pulp obtained by wet grinding to the mass of the ore is 1-3:1. The invention has the following beneficial effects: 1. compared with a technology of leaching vanadium from the vanadous stone coal ore solely with the sulphuric acid, the method can save 5%-25% of sulphuric acid; 2. the method creates a condition for leaching vanadium with sulphuric acid, because hydrofluoric acid generated by the hydrolysis of fluosilicic acid can effectively destroy the crystal structure of siliceous-aluminous minerals which contains roscoelite, kaolin, and the like; 3. the fluosilicic acid can be the industrial byproduct fluosilicic acid and the fluosilicic acid-containing industrial waste water; 4. the vanadium leaching rate of the vanadous stone coal ore is high.

Description

technical field [0001] The invention relates to a method for leaching vanadium from vanadium-containing stone coal mines by using fluosilicic acid and sulfuric acid. Background technique [0002] Vanadium-bearing stone coal mines are the main vanadium-containing resources mined as a single vanadium deposit in my country, and the grade of vanadium is low. 2 o 5 The meter is 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B3/08C22B34/22
CPCY02P10/20
Inventor 田学达张小云钟仁华田路源谭颖杨康杨用龙
Owner 长沙达华矿业技术开发有限公司
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