Method for recycling vanadium by using vanadium-containing waste resources

Abstract

The invention relates to a method for recovering vanadium by using vanadium-containing waste resources, which comprises the following steps: adding vanadium extraction tailings into a certain amount of vanadium-containing wastewater, grinding, reacting at 600-700 DEG C for 2-4 hours, leaching after the reaction is finished, and carrying out solid-liquid separation to obtain a vanadium-containing solution. According to the method, the vanadium-containing wastewater is added in the roasting process of the vanadium-containing solid waste, sodium salt in the vanadium-containing wastewater and the vanadium-containing solid waste are mixed and roasted, and efficient utilization of the vanadium element of the vanadium-containing waste resource is achieved. According to the process, the roasting temperature is reduced, the reaction time is shortened, the cost is reduced, a better extraction effect is achieved, and good economic benefits and application prospects are achieved.

Description

Technical Field

[0001] The invention belongs to the field of metallurgy and chemical industry, and particularly relates to a method for recovering vanadium by utilizing vanadium-containing waste resources. Background Art

[0002] Vanadium is an important rare metal that has a special effect on some physical properties of materials such as tensile strength and fatigue strength. Therefore, vanadium and its alloys are widely used in metallurgy, petrochemical industry, national defense and other technical fields. At present, in the smelting process of vanadium-titanium magnetite, vanadium slag is mostly roasted by the rotary kiln sodium method. After the vanadium is extracted from the vanadium slag, the vanadium content in the vanadium extraction tailings is relatively high. On the one hand, if these vanadium-containing solid wastes are not disposed of and randomly piled up, they will not only occupy a large amount of land resources and increase the management costs of enterprises, but also the tailings contain V 5+ Soluble metal ions such as vanadium are extremely harmful to human health and cause serious harm to people and the environment. On the other hand, if the vanadium in vanadium-containing waste is discarded, it will result in a huge waste of resources. Therefore, it is necessary to actively recycle and reuse it, turning waste into treasure, turning harm into benefit, reducing environmental pollution, avoiding resource waste, and creating considerable economic and social benefits. However, the current process for extracting vanadium from vanadium-containing waste is complex, lengthy, and energy-intensive, and the extraction rate and purity of vanadium are also low. Summary of the Invention

[0003] The purpose of this application is to overcome the shortcomings of the above-mentioned existing technologies and provide a method for recovering vanadium from vanadium-containing waste resources, which can effectively and efficiently recover vanadium elements from vanadium-containing waste resources, has low energy consumption, high yield, simple process, and can be industrialized.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A method for recovering vanadium from vanadium-containing waste resources, comprising the following steps: (1) Add impurity remover to the vanadium-containing wastewater produced by the sodium roasting process to remove impurities and purify it; (2) The vanadium-containing wastewater obtained after impurity removal and purification in step (1) is mixed with vanadium-containing solid waste, and then crushed and ground; (3) The mixture obtained in step (2) is calcined at a certain temperature and then immersed in water to obtain a vanadium-containing solution.

[0005] Preferably, the vanadium-containing wastewater produced by the sodium roasting process has a V content of ≤1500 mg / L; a K content of ≤30 g / L; a Na content of ≤15 g / L; and SO4 2- The content is ≤40g / L.

[0006] Preferably, in step (1), the impurity remover is aluminum sulfate, and the molar ratio of the amount of the impurity remover added to the K content in the vanadium-containing wastewater is (0.8-1.1):1.

[0007] Preferably, the impurity removal and purification temperature in step (1) is 40-60 degrees, and then cooled to room temperature (5-39 degrees Celsius) for crystallization and filtration to obtain potassium aluminum sulfate and vanadium-containing wastewater after impurity removal and purification; in step (1), the K content of the vanadium-containing wastewater after impurity removal and purification is ≤1g / L.

[0008] Preferably, in step (2), the amount of vanadium-containing wastewater after impurity removal and purification is 1-1.5% of the mass of the vanadium-containing solid waste; the vanadium element in the vanadium-containing solid waste is 1 wt%-2 wt% in terms of V2O5; and the solid waste is ground to a particle size of less than 100 mesh.

[0009] Preferably, in step (3), the calcination reaction temperature is 600-700°C and the time is 1-2 hours.

[0010] Preferably, in step (3), the leaching temperature is 75-95° C., the leaching time is 0.5-2 h, and the concentration of the obtained vanadium-containing solution is ≥10 g / L.

[0011] Compared with existing methods, the method for recovering vanadium from vanadium-containing waste resources provided by the present invention has the following advantages: The impurity remover is aluminum sulfate, which is then cooled to room temperature and crystallized and filtered to obtain potassium aluminum sulfate and the vanadium-containing wastewater after impurity removal and purification, thereby achieving the purpose of potassium removal.

[0012] The present invention adopts sodium salt in vanadium-containing wastewater as an additive, which not only reduces the reaction temperature of efficiently extracting vanadium from vanadium-containing waste resources, thus significantly saving energy and reducing consumption, but also efficiently utilizes the sodium salt in the vanadium-containing wastewater, thereby improving the recovery rate of vanadium in the vanadium-containing waste resources.

[0013] The present invention adds vanadium-containing wastewater to the roasting process of vanadium-containing solid waste, and then roasts the sodium salt in the vanadium-containing wastewater with the vanadium-containing solid waste, achieving efficient utilization of vanadium from vanadium-containing waste resources. This process reduces roasting temperature, shortens reaction time, and lowers costs, while achieving better extraction results, offering promising economic benefits and application prospects. DETAILED DESCRIPTION

[0014] For the convenience of understanding the present invention, the present invention is given below with examples. It should be understood by those skilled in the art that the examples are only for the purpose of helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0015] The following are typical but non-limiting examples of the present invention: Example 1

[0016] (1) 100mL of vanadium-containing wastewater produced by the sodium roasting process has a V content of 1200mg / L, a K content of 25g / L, and a Na content of 13g / L; SO4 2- The content is 38g / L.

[0017] An impurity remover is added to the vanadium-containing wastewater, wherein the impurity remover is aluminum sulfate. The molar ratio of the amount of the impurity remover added to the K content in the vanadium-containing wastewater is 0.8:1. The water is purified and impurities removed at 40 degrees, and then cooled to room temperature and crystallized and filtered to obtain potassium aluminum sulfate and the vanadium-containing wastewater after impurity removal and purification. The K content of the vanadium-containing wastewater after impurity removal and purification is 800 mg / L.

[0018] Weigh 10 g of vanadium-containing solid waste (total vanadium content 1.0 wt%, water content 10%), add 1% of the mass of the vanadium-containing solid waste in purified vanadium-containing wastewater, mix evenly, and crush and grind to a particle size of less than 100 mesh.

[0019] The temperature was raised to 700°C and calcined for 1.5 hours to obtain calcined clinker; The obtained roasted clinker is leached with hot water at 90° C. for 2 hours, and vanadium-containing leaching solution and vanadium-extracted tailings are obtained after solid-liquid separation.

[0020] After testing, the vanadium content in the vanadium extraction tailings is 0.12wt%, and the vanadium leaching rate is 86.8%. Example 2

[0021] (1) 100mL of vanadium-containing wastewater produced by the sodium roasting process has a V content of 1500mg / L, a K content of 30g / L, and a Na content of 15g / L; SO4 2- The content is 35g / L.

[0022] An impurity remover is added to the vanadium-containing wastewater, the impurity remover is aluminum sulfate, the molar ratio of the impurity remover added to the K content in the vanadium-containing wastewater is 1:1, the impurity is purified at 50 degrees, and then cooled to room temperature for crystallization and filtration to obtain potassium aluminum sulfate and the vanadium-containing wastewater after impurity removal and purification. The K content of the vanadium-containing wastewater after impurity removal and purification is 720 mg / L.

[0023] Weigh 10 g of vanadium-containing solid waste (total vanadium content 1.0 wt%, water content 10%), add 1.2% of the mass of the vanadium-containing solid waste in purified vanadium-containing wastewater, mix well, crush and grind to a particle size of less than 100 mesh.

[0024] The temperature was raised to 600°C and calcined for 1 hour to obtain calcined clinker; The obtained roasted clinker was leached with hot water at 75° C. for 0.5 h, and vanadium-containing leaching solution and vanadium-extracted tailings were obtained after solid-liquid separation.

[0025] After testing, the vanadium content in the vanadium extraction tailings was 0.10wt%, and the vanadium leaching rate was 88.2%. Example 3

[0026] (1) 100mL of vanadium-containing wastewater produced by the sodium roasting process has a V content of 1500mg / L, a K content of 26g / L, and a Na content of 12g / L; SO4 2- The content is 40g / L.

[0027] An impurity remover is added to the vanadium-containing wastewater, the impurity remover is aluminum sulfate, the molar ratio of the amount of the impurity remover added to the K content in the vanadium-containing wastewater is 1.1:1, the impurity is removed at 60 degrees, and then cooled to room temperature for crystallization and filtration to obtain potassium aluminum sulfate and the vanadium-containing wastewater after impurity removal and purification. The K content of the vanadium-containing wastewater after impurity removal and purification is 645 mg / L.

[0028] (2) Weigh 10 g of vanadium-containing solid waste (total vanadium content 2.0 wt%, water content 10%), add 1.5% of the mass of vanadium-containing solid waste in purified vanadium-containing wastewater, mix well, and crush and grind until the particle size is less than 100 mesh.

[0029] (3) Heating to 680°C and roasting for 2 hours to obtain roasted clinker; The obtained roasted clinker is leached with hot water at 95° C. for 1 hour, and vanadium-containing leaching solution and vanadium-extracted tailings are obtained after solid-liquid separation.

[0030] After testing, the vanadium content in the vanadium extraction tailings is 0.14wt%, and the vanadium leaching rate is 86.2%.

[0031] Comparative Example 1

[0032] Weigh 10 g of vanadium-containing solid waste (1.0% total vanadium content, 10% water content), crush and grind it to a particle size of less than 100 mesh, heat it to 700°C and roast it for 1.5 hours to obtain roasted clinker; The obtained roasted clinker is leached with hot water at 90° C. for 2 hours, and vanadium-containing leaching solution and vanadium-extracted tailings are obtained after solid-liquid separation.

[0033] After testing, the vanadium content in the vanadium extraction tailings is 0.28wt%, and the vanadium leaching rate is 69.8%.

[0034] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for recovering vanadium from vanadium-containing waste resources, characterized in that: The following steps are involved: (1) Add impurity remover to the vanadium-containing wastewater produced by the sodium roasting process to remove impurities and purify it; (2) mixing the vanadium-containing wastewater obtained after impurity removal and purification in step (1) with the vanadium-containing solid waste, crushing and grinding the mixture to obtain a mixture; (3) The mixture obtained in step (2) is calcined at a certain temperature, soaked in water, and subjected to solid-liquid separation to obtain a vanadium-containing solution.

2. The method for recovering vanadium from vanadium-containing waste resources according to claim 1, wherein: The vanadium-containing wastewater produced by the sodium roasting process has a V content of ≤1500 mg / L; a K content of ≤30 g / L; a Na content of ≤15 g / L; and SO4 2- The content is ≤40g / L.

3. The method for recovering vanadium from vanadium-containing waste resources according to claim 1, wherein: In step (1), the impurity remover is aluminum sulfate, and the molar ratio of the amount of the impurity remover added to the K content in the vanadium-containing wastewater is (0.8-1.1):

1.

4. The method for recovering vanadium from vanadium-containing waste resources according to claim 1, wherein: Step (1) impurity removal and purification at a temperature of 40-60 degrees, then cooling to room temperature, crystallizing and filtering to obtain potassium aluminum sulfate and vanadium-containing wastewater after impurity removal and purification; In step (1), the K content of the vanadium-containing wastewater after impurity removal and purification is ≤1 g / L.

5. The method for recovering vanadium from vanadium-containing waste resources according to claim 1, wherein: In step (2), the amount of vanadium-containing wastewater after impurity removal and purification is 1-1.5% of the mass of the vanadium-containing solid waste; the vanadium element in the vanadium-containing solid waste is 1wt%-2wt% in terms of V2O5; and the solid waste is ground to a particle size of less than 100 mesh.

6. The method for recovering vanadium from vanadium-containing waste resources according to claim 1, characterized in that: In step (3), the calcination reaction temperature is 600-700°C and the time is 1-2 hours.

7. The method for recovering vanadium from vanadium-containing waste resources according to claim 1, characterized in that: In step (3), the leaching temperature is 75-95° C., the leaching time is 0.5-2 h, and the concentration of the obtained vanadium-containing solution is ≥10 g / L.