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Method for recovering vanadium by virtue of magnesiation and roasting of stone coal

A fluidized roasting and roasting technology, which is applied in the field of mineral processing, can solve the problems of large tail gas emissions, achieve low production costs, reduce harmful gas emissions, and reduce water and acid consumption.

Inactive Publication Date: 2015-09-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, at present, the main problems faced by vanadium extraction from stone coal are the large amount of tail gas emissions and the consumption of water and acid for leaching.

Method used

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  • Method for recovering vanadium by virtue of magnesiation and roasting of stone coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A certain stone coal ore in Hunan Province containing 1.57% vanadium was placed in a fluidized bed, and was roasted and decarburized by passing air at 750°C for 1 hour to obtain roasted slag; 4 The roasted slag after decarburization was added and mixed to -100 mesh to account for 80%, and the ore sample was placed in a circulating fluidized bed for fluidized roasting at a roasting temperature of 800°C and a roasting time of 3 hours; leaching with distilled water at 80°C at a liquid-solid ratio of 15mL / g for 2.5h and then filtering to obtain a vanadium-containing leaching solution. The filter residue was pickled with 20% sulfuric acid at 80°C for 2 hours. The acid leaching slag was washed 3 times with distilled water, and the washing liquid was mixed with the acid leaching liquid and used as the leaching agent for the roasted sample. After the washing slag was dried, it was mixed with the newly prepared stone coal decarburization roasting slag at a mass ratio of 10%, and...

Embodiment 2

[0031] A certain stone coal ore in Guangxi containing 1.11% vanadium was placed in a circulating fluidized bed, and was roasted and decarburized by air at 700°C for 0.5h to obtain roasted slag; 4 The decarburized roasted slag was added and mixed until -100 mesh accounted for more than 80%, and the ore sample was placed in a circulating fluidized bed for fluidized roasting at a roasting temperature of 800°C and a roasting time of 2 hours; The vanadium-containing leaching solution was obtained by leaching with distilled water at 60°C under pressure at a liquid-solid ratio of 10mL / g for 4h and then filtering. The filter residue was pickled with 30% sulfuric acid at 60°C for 2 hours. The acid leaching slag was washed 5 times with distilled water, and the washing liquid was mixed with the acid leaching liquid and used as a leaching agent for the roasted sample. After the washing slag was dried, it was mixed with the newly prepared stone coal decarburization roasting slag at a mass ...

Embodiment 3

[0033] A certain stone coal ore in Guizhou containing 1.72% vanadium was placed in a fluidized bed and decarburized by passing air at 800°C for 1 hour to obtain roasted slag; 4 The roasted slag after decarburization was added and mixed until -100 mesh accounted for more than 80%, and the ore sample was placed in a circulating fluidized bed for fluidized roasting at a roasting temperature of 700°C and a roasting time of 6 hours; The vanadium-containing leaching solution was obtained by leaching with distilled water at 90°C under pressure at a liquid-solid ratio of 20mL / g for 2h and then filtering. The filter residue was pickled with 10% sulfuric acid at 90°C for 4 hours. The acid leaching slag was washed 3 times with distilled water, and the washing liquid was mixed with the acid leaching liquid and used as the leaching agent for the roasted sample. Roasted slag mass 20% MgSO 4 Carry out ore grinding, and then further obtain vanadium-containing leaching solution through the abo...

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Abstract

The invention belongs to the technical field of mineral processing and particularly relates to a method for recovering vanadium by virtue of magnesiation and roasting of stone coal. The technical scheme is as follows: decarburizing stone coal ores, then adding MgSO4, performing fine grinding until the granularity is not greater than 100 meshes, performing fluosolid roasting, and performing water leaching on the roasted sample at a certain temperature, thereby obtaining vanadium-containing leachate; leaching the water leaching dregs with sulphuric acid, washing the leaching dregs with water, mixing acid leaching liquor with a washing solution so as to obtain a mixture used for leaching roasting dregs during water leaching, drying washed residues, mixing the dried washed residues with the decarburized stone coal ore, and performing ore grinding; and performing extraction and impurity removal on the obtained vanadium-containing leachate, then adding an NH4Cl solution for molybdenum precipitation, and incinerating the precipitate to obtain V2O5. The method is used for processing stone coal vanadium ore with vanadium content of no less than 0.80%; the recovery rate of vanadium in the obtained leachate is no less than 75%. According to the method, less harmful gases are discharged in a roasting process, the water consumption and the acid consumption are less, the production cost is low, solids and liquids can be recycled, and the application potential is great, so that the method is an economical and effective vanadium recovery method.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular, the invention relates to a method for extracting vanadium by magnesizing and roasting stone coal. Background technique [0002] Most of the vanadium in stone coal exists in mica clay minerals in the form of trivalent vanadium ions and tetravalent vanadium ions. Since the atomic radius of vanadium is similar to that of aluminum atoms, it is easier to enter into the silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron. Substitution occurs in the octahedral lattice, and it is not easy to come out. Therefore, the process of extracting vanadium from stone coal often needs to destroy the mineral lattice by adding acid or roasting, so that the trivalent vanadium ions and tetravalent vanadium ions can be converted into pentavalent vanadium ions. Generate vanadate and be extracted. [0003] At present, the technical means for extracting vanadium from stone coal mainly incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10C22B3/04C22B3/08C22B34/22
CPCY02P10/20
Inventor 李浩然杨鑫龙刘鹏伟杜竹玮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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