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Method for extracting vanadium from burning slag of stone coal vanadium mine fluidized bed

A technology of burning ash and stone coal vanadium, which is applied in the field of vanadium extraction, can solve the problems of low recovery rate, unstable operation, low roasting conversion rate, etc., and achieve the effects of reducing the consumption of sulfuric acid, reducing the burden of desiliconization, and lowering the roasting temperature

Inactive Publication Date: 2012-10-17
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The direct acid leaching process has high acid consumption, high energy consumption, high production cost, and high requirements for equipment anti-corrosion
This process is only suitable for stone coal vanadium mines where vanadium mainly exists in kaolinite and illite in the state of adsorption
The roasting temperature of the secondary roasting is between 800°C and 950°C, and the roasting time is more than 2 hours. In industrial production, only the flat kiln can basically meet the requirements of the roasting process, but the flat kiln occupies a large area and the working conditions are poor. , unstable operation, low roasting conversion rate, low metal recovery rate, unable to realize large-scale industrial production
[0004] The existing stone coal vanadium extraction process not only has a recovery rate of only about 50-74% of vanadium, but also the temperature of the roasting process is as high as 800°C~950°C, and the roasting time is long, so it is impossible to find large-scale roasting equipment that meets the requirements of the process conditions.

Method used

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  • Method for extracting vanadium from burning slag of stone coal vanadium mine fluidized bed

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Hunan Xiangzhong Mining Company's fluidized bed combustion ash contains V 2 O 5 1.25% Al 2 O 3 8.23%, grind the ash and ammonium sulfate at a mass ratio of 1:1.1 to 69% with a particle size of less than 0.043mm, then roast at 380°C for 2h, and use 2 times the weight of the roasted material at 80°C to 3% H 2 SO 4 The solution was leached for 3 hours, the leaching rate of vanadium was 90.1%, and the leaching rate of aluminum reached 93.1%.

Embodiment 2

[0039] The fluidized bed combustion ash and ammonium sulfate of Example 1 were mixed and ground at a mass ratio of 1:0.9 to 90% with a particle size of less than 0.043mm, then calcined at 500°C for 1h, and at 90°C with 2 times the weight of the calcined material 10%H 2 SO 4 The solution was leached for 0.5h, the leaching rate of vanadium was 88.9%, and the leaching rate of aluminum reached 91.8%.

Embodiment 3

[0041] The fluidized bed combustion ash of a vanadium industry company in Guangxi contains Al 2 O 3 18.2%V 2 O 5 1.43%. After mixing furnace ash and ammonium sulfate at a mass ratio of 1:1.5 to 60% with a particle size of less than 0.043mm, smelt at 400℃ for 3h, and at 70℃, leaching with 5% sulfuric acid solution 1.8 times the weight of the calcined material 0.5h, the leaching rate of vanadium reached 88.7%, and the leaching rate of aluminum reached 90.9%.

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Abstract

The invention relates to a method for extracting vanadium from burning slag of a stone coal vanadium mine fluidized bed. The method comprises the following process flows of: grinding the burning slag of the stone coal vanadium mine fluidized bed together with ammonium sulfate, and roasting an obtained ground material at a low temperature; leaching an obtained roasting product by adopting dilute sulphuric acid, and sequentially preparing V2O5 and aluminum compounds from an obtained leaching solution by adopting a conventional method; preparing ammonium sulfate from the solution after aluminum extraction; and returning the obtained aluminum extraction to the grinding procedure for recycling. The invention provides the method for extracting the vanadium by roasting the burning slag of the stone coal vanadium mine fluidized bed at the low temperature and then leaching by using the dilute sulphuric acid, wherein the roasting temperature of the method is only 300-500 DEG C, and compared with the traditional sodication, calcification and low sodium roasting, the roasting temperature of the method is reduced by a half, so the energy consumption is obviously reduced, and the method is easy to implement in industrial production and solves the problem that proper roasting equipment is short of large production lines for extracting the vanadium from stone coal. Due to the method, the vanadium and the aluminum are more easily extracted from the leaching solution by using the traditional technology, and the leaching rates of vanadium and aluminum are respectively more than 88% and 91% which are both higher than those in the traditional method; and the ammonium sulfate is recovered from waste water where the vanadium and the aluminum are extracted and then returned to be used as an ingredient, so the method has the advantages of less consumption auxiliary materials, low processing cost and environmental protection.

Description

Technical field: [0001] The invention relates to a method for extracting vanadium from the burning ash slag of a fluidized bed of stone coal vanadium ore by adopting an ammonium sulfate roasting method, and belongs to the field of chemical metallurgy. Background technique: [0002] Vanadium is an important strategic material. It has many excellent physical and chemical properties and mechanical properties such as high melting point and easy deformation processing. Therefore, it is widely used in modern industrial technology such as iron and steel, defense cutting-edge technology, chemical industry and light textile industry. [0003] my country's vanadium resources are mainly contained in stone coal. Extracting vanadium from stone coal is an important development direction for the utilization of vanadium resources in my country. Stone coal is also a low calorific value fuel with a calorific value of about 4000kJ / kg~6000kJ / kg. Recently, the process of comprehensive utilization of s...

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 陈爱良蔡晋强
Owner CENT SOUTH UNIV
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