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Method for extracting sulfur and vanadium from vanadium-contained desulfurization slag

A technology for desulfurization slag and tailings, applied in the field of extracting sulfur and vanadium, can solve the problems of inability to effectively recover, unsatisfactory economic benefits, waste of valuable resources, etc., and achieve the effects of alleviating adverse effects, good economic benefits, and simple process

Inactive Publication Date: 2019-06-21
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above method only realizes the secondary utilization of the desulfurization slag, and cannot effectively recover the valuable vanadium elements in the vanadium-containing desulfurization slag, resulting in a great waste of valuable resources
Although the traditional wet process (acid leaching, alkali leaching) can effectively extract vanadium, the extraction process produces a large amount of waste water that requires secondary treatment, high energy consumption, and unsatisfactory economic benefits.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a method for extracting sulfur and vanadium from vanadium-containing desulfurization slag, the method comprising the following steps:

[0040] (1) Crushing and finely grinding the vanadium-containing desulfurization slag to below 150 mesh, then placing it in a muffle furnace, and roasting it in blank at 700°C for 2 hours, and obtaining roasted clinker after the roasting is completed;

[0041] (2) Mix the roasted clinker obtained in step (1) with water at a mass ratio of 1:6, stir and leach at 80°C for 1.5h, filter after the reaction is completed, and obtain tailings and leachate;

[0042] (3) cooling the leachate obtained in step (2) to 25° C. for crystallization, and filtering to obtain sodium sulfate crystals and crystallized liquid after the crystallization is completed;

[0043] (4) the concentration of vanadium in the liquid after step (3) gained crystallization is 2g / L, it is returned in the step (2) for the leaching of roasted clinker;

...

Embodiment 2

[0047] A method for extracting sulfur and vanadium from vanadium-containing desulfurization slag, said method comprising the steps of:

[0048] (1) Crushing and finely grinding the vanadium-containing desulfurization slag to below 150 mesh, then placing it in a muffle furnace, and roasting at 800°C for 1.5 hours in a blank state, and obtaining roasted clinker after the roasting is completed;

[0049](2) Mix the roasted clinker obtained in step (1) with water at a mass ratio of 1:3, stir and leach at 95°C for 1 hour, and filter after the reaction is completed to obtain tailings and leachate;

[0050] (3) cooling the leachate obtained in step (2) to 20° C. for crystallization, and filtering to obtain sodium sulfate crystals and liquid after crystallization after the crystallization is completed;

[0051] (4) The concentration of vanadium in the crystallized liquid obtained in step (3) is 10g / L, and it is returned to the vanadium slag sodium roasting process to be converted into ...

Embodiment 3

[0054] A method for extracting sulfur and vanadium from vanadium-containing desulfurization slag, said method comprising the steps of:

[0055] (1) Break and finely grind the vanadium-containing desulfurization slag to below 150 mesh, then place it in a muffle furnace, and roast it at 750°C for 2.5 hours in a blank state, and obtain roasted clinker after the roasting is completed;

[0056] (2) Mix the roasted clinker obtained in step (1) with water at a mass ratio of 1:5, stir and leach at 100°C for 0.5h, filter after the reaction is completed, and obtain tailings and leachate;

[0057] (3) cooling the leachate obtained in step (2) to 22° C. for crystallization, and filtering to obtain sodium sulfate crystals and crystallized liquid after the crystallization is completed;

[0058] (4) the concentration of vanadium in the liquid after step (3) gained crystallization is 5g / L, it is returned in the step (2) for the leaching of roasted clinker;

[0059] (5) Repeat the above opera...

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PUM

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Abstract

The invention relates to a method for extracting sulfur and vanadium from vanadium-contained desulfurization slag. The method comprises the following steps: the blank roasting is performed on the vanadium-contained desulfurization slag to obtain roasted clinkers; the roasted clinkers are mixed with water for leaching to obtain tailing slag and leaching liquid after solid-liquid separation; and theleaching liquid is cooled and crystallized for solid-liquid separation to obtain sodium sulfate crystals and vanadium-contained crystallization back liquid. The method realizes resourceful recyclingof valuable elements in the vanadium-contained desulfurization slag, wherein the recovery rate of sulfur is higher than 93%, the recovery rate of vanadium is higher than 85%, and sodium sulfate products with purity above 94% are obtained. The method relieves the adverse effect on the environment by accumulation of the vanadium-contained desulfurization slag, meanwhile, gains excellent economical benefit, is simple in whole treatment process flow, discharges no waste water in the production process, and is prominent in economical and environmental benefit and suitable for industrial popularization.

Description

technical field [0001] The invention belongs to the fields of vanadium metallurgy and solid waste recovery, and in particular relates to a method for extracting sulfur and vanadium from vanadium-containing desulfurization slag. Background technique [0002] Vanadium is an associated element existing in vanadium-titanium magnetite. Due to its important physical and chemical properties, it has become an important strategic resource and is widely used in national defense, chemical industry, metallurgy and other fields. The iron and steel smelting industry changes the strength of steel by adding vanadium, and the amount of vanadium in the iron and steel industry is also increasing year by year. [0003] Due to the large content of low-grade vanadium-titanium magnetite in my country, a large amount of vanadium-containing solid waste will be generated in many industrial production processes such as steelmaking, petroleum refining, alumina production, and power station power genera...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B34/22C01B17/96
CPCY02P10/20
Inventor 周冰晶李男李兰杰高明磊
Owner HEBEI IRON AND STEEL