Method for extracting vanadium and chromium from vanadium-containing steel slag by high-alkalinity potassium hydroxide

A potassium hydroxide and high alkalinity technology, applied in the field of metallurgy, can solve the problems of low effective calcium oxide content, highly toxic chromium-containing slag, difficult treatment, etc. The effect of shortening the reaction time

Active Publication Date: 2011-05-25
HEBEI IRON AND STEEL
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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
In addition, vanadium-containing steel slag also contains 1%-5% chromium. Since the traditional roasting process cannot recover chromium, highly toxic chromium-containing slag is produced during the process of vanadium extraction, which causes certain difficulties for subsequent treatment.

Method used

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Embodiment 1

[0016] A method for extracting vanadium and chromium from vanadium-containing steel slag with a high-alkalinity potassium hydroxide medium: Weigh 200g of solid analytical pure KOH into the reaction kettle, add 67mL of deionized water to an initial concentration of 75%, turn on the stirring, and heat up To 200°C, weigh 50g of vanadium-containing steel slag and place it in the reactor, and feed air into the reactor at 2L / min for a reaction time of 6h. At the end of the reaction, add 400 mL of water to the reaction kettle for dilution, and filter with suction. The alkalinity of the liquid phase is 343.6 g / L, and the residue is washed three times. Chemical analysis and instrumental analysis were used to analyze the content of slag phase and liquid phase. The total amount of vanadium in tailings is 0.122wt% (calculated as vanadium pentoxide), and the total amount of chromium in tailings is 0.103wt% (calculated as chromium trioxide). The resulting vanadium leaching rate was 96.5%, ...

Embodiment 2

[0018] A method for extracting vanadium and chromium from vanadium and chromium-containing steel slag with high alkalinity potassium hydroxide medium: Weigh 200g of solid industrial pure KOH into the reaction kettle, add 50mL of deionized water to the initial concentration of 80%, turn on the stirring, and heat The temperature was raised to 220° C., 50 g of vanadium-containing steel slag was weighed into the reactor, and air was introduced into the reactor at 2 L / min for a reaction time of 4 hours. At the end of the reaction, 600 mL of water was added to the reaction kettle to dilute, and filtered by suction, the alkalinity of the liquid phase was 230.2 g / L, and the residue was washed three times. Chemical analysis and instrumental analysis are used to analyze the contents of liquid phase and slag phase. The total amount of vanadium in the tailings is 0.101wt% (calculated as vanadium pentoxide), and the total amount of chromium in the tailings is 0.0743 wt% (calculated as chro...

Embodiment 3

[0020] A method for extracting vanadium and chromium from vanadium-containing steel slag with a high-alkalinity potassium hydroxide medium: Weigh 169g of solid analytical pure KOH and 31g of KNO3 in a reaction kettle, add 108mL of deionized water to an initial alkali concentration of 55%, KNO3 The initial concentration is 10%, turn on the stirring, heat up to 180°C, weigh 50g of vanadium-containing steel slag into the reaction kettle, and feed air into the reaction kettle at 2L / min, and the reaction time is 5h. At the end of the reaction, 500 mL of water was added to the reaction kettle for dilution, and suction filtration was performed. The alkalinity of the liquid phase was 236.3 g / L, and the residue was washed three times. Chemical analysis and instrumental analysis are used to analyze the contents of liquid phase and slag phase. The total amount of vanadium in the tailings is 0.136wt% (calculated as vanadium pentoxide), and the total amount of chromium in the tailings is 0...

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Abstract

The invention relates to a method for extracting vanadium and chromium from vanadium-containing steel slag by high-alkalinity potassium hydroxide, and belongs to the technical field of metallurgy. The invention adopts a technical scheme that: the steel slag together with water and potassium hydroxide is added into a reactor, the mixture is decomposed under normal pressure, and then the obtained reaction slurry is cooled and diluted by a diluent to obtain mixed slurry containing the potassium hydroxide, potassium vanadate, potassium silicate, potassium chromate and tailings; the alkalinity of the potassium hydroxide in the mixed slurry is controlled to be more than or equal to 100g / L, the mixed slurry is filtered and separated while the temperature is kept to be 80 to 130 DEG C to obtain the tailings and vanadium and chromium-containing water solution. The method has the advantages that: the high-temperature roasting is avoided, the reaction time is shortened, the single high-efficientextraction and simultaneous extraction of the vanadium and the chromium are realized; atmospheric pollutant as Cl2, HCl, dust, SO2 and the like caused by roasting are effectively avoided in the vanadium extraction process; and compared with the conventional roasting process, the generated amount and the discharged amount of waste water are effectively reduced, and clean production is realized.

Description

technical field [0001] The invention relates to a method for extracting vanadium and chromium from vanadium-containing steel slag by using a high-alkalinity potassium hydroxide medium, which belongs 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 content of calcium, iron and silicon, low content of vanadium, complex occurrence state of vanadium, and dispersed distribution in various mineral phases, it is difficult to recycle vanadium in it according to the traditional roasting process. In my country, millions of tons of vanadium-containing steel slag are discharged without treatment every year, which not only cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/12C22B34/22C22B34/32
CPCY02P10/20
Inventor 陈东辉高明磊郑诗礼杜浩李兰杰解万里黄荣艳刘晓华王浩宇
Owner HEBEI IRON AND STEEL
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