Method for extracting vanadium by roasting vanadium-containing stone coal

A vanadium stone and roasting technology, which is applied in the field of vanadium extraction, can solve the problems of large proportion of roasting additives, large roasting treatment capacity, and increased burden of mixing operations, etc., and achieves short roasting and leaching time, high vanadium leaching rate, and shortened production. cycle effect

Inactive Publication Date: 2017-05-31
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In its embodiment, 1 kg of ash slag after decarburization of primary ore of stone coal is added with 220 g of additives. The proportion of roasting additives added is too large, which increases the burden of mixing operations in industrial production, and the amount of roasting is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for extracting vanadium by roasting vanadium-containing stone coal. First, the mass ratio of vanadium-bearing coal ore: roasting additive is 1: (0.045~0.07) ingredients, mix well, and grind to a particle size of ≤0.15mm. Then the temperature is increased to 700-800℃ at a rate of 6-10℃ / min, and the temperature is kept for 1 to 1.3h to obtain calcine. Then, according to the solid-liquid mass ratio of 1: (1.5-1.9), the calcine is added to dilute sulfuric acid, stirred at 90-96°C for 0.5-1.2 h, and solid-liquid separation is performed to obtain a leachate and a leachate residue.

[0024] The vanadium-bearing coal ore is a refractory vanadium-bearing coal in which vanadium occurs in mica minerals in the form of low valence and isomorphism; the vanadium-bearing coal ore: V 2 O 5 The grade is 0.6~1.0wt%, and the CaO content is 4.0~6.0wt%.

[0025] The baking additives are CaO, CaF 2 And MnO 2 The mixture; where: CaO:CaF 2 : MnO 2 The mass ratio is 1:(0.55~0.80):(0.16~0.18...

Embodiment 2

[0028] A method for extracting vanadium by roasting vanadium-containing stone coal. First, the mass ratio of vanadium-bearing coal ore: roasting additive is 1: (0.07~0.095) ingredients, mix well, and grind to a particle size ≤0.15mm. Then the temperature is increased to 750~850℃ at a rate of 10~14℃ / min, and the temperature is kept for 1.1~1.4h to obtain calcine. Then, according to the solid-liquid mass ratio of 1: (1.8-2.2), the calcine is added to dilute sulfuric acid, stirred at 92-98°C for 0.9-1.6 h, and solid-liquid is separated to obtain the leaching liquid and the leaching residue.

[0029] The vanadium-bearing coal ore is a refractory vanadium-bearing coal in which vanadium occurs in mica minerals in the form of low valence and isomorphism; the vanadium-bearing coal ore: V 2 O 5 The grade is 0.8~1.2wt%, and the CaO content is 5.0~7.0wt%.

[0030] The baking additives are CaO, CaF 2 And MnO 2 The mixture; where: CaO:CaF 2 : MnO 2 The mass ratio is 1:(0.60~0.90):(0.14~0.16). ...

Embodiment 3

[0033] A method for extracting vanadium by roasting vanadium-containing stone coal. First, the mass ratio of vanadium-bearing coal ore: roasting additive is 1: (0.090~0.115) ingredients, mix them, and grind to a particle size of ≤0.15mm. Then the temperature is raised to 800-900℃ at a rate of 12-16℃ / min, and the temperature is kept for 1.2-1.5h to obtain calcine. Then, according to the solid-liquid mass ratio of 1:(2.1~2.5), the calcine is added to dilute sulfuric acid, stirred at 94~100°C for 1.3~2h, and solid-liquid separation is performed to obtain leachate and leachate residue.

[0034] The vanadium-bearing coal ore is a refractory vanadium-bearing coal in which vanadium occurs in mica minerals in the form of low valence and isomorphism; the vanadium-bearing coal ore: V 2 O 5 The grade is 1.0~1.4wt%, and the CaO content is 6.0~8.0wt%.

[0035] The baking additives are CaO, CaF 2 And MnO 2 The mixture; where: CaO:CaF 2 : MnO 2 The mass ratio is 1:(0.75~1.0):(0.10~0.14).

[0036]...

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Abstract

The invention relates to a method for extracting vanadium by roasting vanadium-containing stone coal. According to the technical scheme of the method, firstly, vanadium-containing stone coal raw ore and a roasting additive are prepared, evenly mixed and ground till the granularity is smaller than or equal to 0.15 mm, wherein the mass ratio of the vanadium-containing stone coal raw ore to the roasting additive is 1:(0.045-0.115); then the temperature is increased to 700 DEG C to 900 DEG C at the rate of 6 DEG C / min-16 DEG C / min, heat preservation is conducted for 1 h to 1.5 h, and roasted ore is obtained; then the roasted ore is added into dilute sulfuric acid according to the solid-liquid mass ratio of 1:(1.5-2.5), stirring is conducted for 0.5 h to 2 h under the temperature ranging from 90 DEG C to 100 DEG C, solid-liquid separation is conducted, and leaching liquid and leaching slag are obtained; the roasting additive is a mixture of CaO, CaF2 and MnO2, wherein the mass ratio of the CaO to the CaF2 to the MnO2 is 1:(0.55-1):(0.10-0.18); and the volume concentration of the dilute sulfuric acid ranges from 8% to 18%. The method has the beneficial effects of being low in roasting temperature, short in roasting time, high in vanadium leaching rate, high in leaching speed and environment-friendly, and the leaching slag obtained in the method can serve as cement admixture, and comprehensive utilization of solid waste obtained after vanadium extraction is achieved.

Description

Technical field [0001] The invention belongs to the technical field of vanadium extraction. Specifically, it relates to a method for extracting vanadium by roasting vanadium-containing stone coal. Background technique [0002] For the vanadium extraction process of mica-type vanadium-bearing stone coal, it is necessary to destroy the aluminosilicate mineral structure and release the target element vanadium into the solution. my country's stone coal vanadium extraction process is generally divided into fire roasting-wet vanadium extraction and full wet vanadium extraction. Among them, the total wet vanadium extraction process has strong selectivity to the raw ore, and is only suitable for oxidizing stone coal in high valence and adsorption states, and requires high acid concentration or high temperature and pressure conditions to destroy vanadium-containing silicon The lattice structure of aluminate minerals has a high production cost. When vanadium is embedded in the minerals,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/08C22B34/22
CPCC22B1/02C22B3/08C22B34/22Y02P10/20
Inventor 刘涛汪博张一敏黄晶陈铁军
Owner WUHAN UNIV OF SCI & TECH
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