Method for extracting vanadium from vanadium-containing steel slag by using highly-alkaline sodium hydroxide medium

A sodium hydroxide and high alkalinity technology, applied in the field of vanadium extraction, can solve the problems of insufficient processing capacity of vanadium-containing steel slag, increased energy consumption in the iron-making process, low content of effective calcium oxide, etc., and achieves low production cost and economical efficiency. The effect of good economic and environmental benefits and high dissolution rate

Active Publication Date: 2011-06-15
承德承钢柱宇钒钛有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the steel slag has many impurities and the effective calcium oxide content is relatively low, which will reduce the grade of sinter and increase the energy consumption of the ironmaking process, so it is not suitable to mix it in large quantities, so the processing capacity of the vanadium-containing steel slag in this process cannot meet the actual production needs
And some emerging technologies such as selective precipitation, microbial leaching, ore slurry electrolysis, etc., are used in the research of vanadium extraction from vanadium-containing steel slag. limitation

Method used

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  • Method for extracting vanadium from vanadium-containing steel slag by using highly-alkaline sodium hydroxide medium
  • Method for extracting vanadium from vanadium-containing steel slag by using highly-alkaline sodium hydroxide medium

Examples

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Embodiment 1

[0017] A method for extracting vanadium from vanadium-containing steel slag with high-alkalinity sodium hydroxide medium: Weigh 200g of solid industrial NaOH into a reaction kettle, add 50mL of deionized water to an initial concentration of 60%, start stirring, and the stirring speed is 600rpm , heated up to 200°C, weighed 50g of vanadium-containing steel slag and put it in the reactor, and the reaction time was 6h; at the end of the reaction, 400mL of water was added to the reactor to dilute, filtered by suction, the alkalinity of the liquid phase was 345g / L, and the slag was Washing three times; using chemical and instrumental analysis to analyze the content of vanadium in the slag phase and liquid phase, the total vanadium content in the tailings is 0.435wt% (calculated as vanadium pentoxide), and the leaching rate of the obtained vanadium is 87.5%.

Embodiment 2

[0019] A method for extracting vanadium from vanadium-containing steel slag with a high-alkalinity sodium hydroxide medium: Weigh 200g of solid analytical pure NaOH in a reaction kettle, add 50mL of deionized water to an initial concentration of 80%, turn on the stirring, and the stirring speed 600rpm, heat up to 240°C, weigh 50g of vanadium-containing steel slag and put it in the reaction kettle, and the reaction time is 4h. At the end of the reaction, add 400mL of water to the reaction kettle to dilute, filter with suction, the alkalinity of the liquid phase is 356.5g / L, wash the slag three times; use chemistry and instruments to analyze the content of vanadium in the slag phase and liquid phase. The total amount of vanadium is 0.338wt% (calculated as vanadium pentoxide), and the leaching rate of the obtained vanadium is 90.3%.

Embodiment 3

[0021] A method for extracting vanadium from vanadium-containing steel slag with a high-alkalinity sodium hydroxide medium: Weigh 175g of solid analytically pure NaOH and 25g of NaNO3 in a reaction kettle, add 50mL of deionized water to an initial alkali concentration of 70%, nitric acid The initial concentration of sodium is 10%; turn on the stirring, the stirring speed is 600rpm, heat up to 220°C, weigh 50g of vanadium-containing steel slag and put it in the reaction kettle, and the reaction time is 5h; The basicity of the phase is 346.40g / L, and the slag is washed three times; the content of vanadium in the slag phase and liquid phase is analyzed by chemical and instrumental analysis. The total amount of vanadium in the tailings is 0.452wt% (calculated as vanadium pentoxide), and the leaching rate of vanadium obtained is 87%.

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Abstract

The invention relates to a method for extracting vanadium from vanadium-containing steel slag by using a highly-alkaline sodium hydroxide medium, belonging to the technical field of metallurgy. The technical scheme comprises the following steps: adding steel slag, water and NaOH into a reactor together, wherein the mass concentration of the NaOH solution is 65-90%; decomposing and leaching under atmospheric pressure, and diluting the obtained slurry with a diluter to obtain a slurry mixture; and separating the slurry mixture by filtering at constant temperature, and washing the slag with a washing solution to obtain tailings and a vanadium-containing water solution. The method provided by the invention can be implemented under atmospheric pressure at low temperature (greatly lower than the roasting temperature in the traditional pyrogenic process), and is easy to operate and safe; and the extraction rate of vanadium is greatly higher than that of the existing vanadium recovery technique based on the pyrogenic process and wet process, the one-time recovery rate of vanadium is 85-90%, and the total content of vanadium in the tailings is 0.3-0.6 wt%. The invention solves the problem that vanadium in the vanadium-containing steel slag can not be easily recovered, and has the advantages of high recovery rate of vanadium, low production cost, favorable economic benefit and environmental benefit, and the like.

Description

technical field [0001] The invention relates to a method for extracting vanadium from vanadium-containing steel slag by using a high-alkalinity sodium hydroxide medium, belonging to the technical field of metallurgy. Background technique [0002] Vanadium-containing steel slag is vanadium-containing steel slag formed by direct steelmaking (normal slagging) of vanadium-containing molten iron due to various reasons (without oxidation and vanadium extraction process) and contains V2O5 at 2%~10%. Compared with normal vanadium slag, its calcium The content is greatly exceeded. Due to its high calcium and iron content, low vanadium content, complex occurrence state of vanadium, and dispersed distribution in various mineral phases, it is difficult to recycle vanadium in it by traditional fire roasting extraction process. In my country, millions of tons of vanadium-containing steel slag are discharged without treatment every year, which not only causes the loss of vanadium resource...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 高明磊陈东辉郑诗礼杜浩李兰杰解万里刘晓华
Owner 承德承钢柱宇钒钛有限公司
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