Method for extracting tungsten from wolframite ore

Abstract

The present application relates to the technical field of tungsten ore processing. Provided is a method for extracting tungsten from wolframite ore. The method comprises: adding wolframite ore, a certain amount of sodium carbonate, a strong basic salt, and water into a pressure vessel, controlling the temperature and rotational speed, and after leaching is completed, filtering, washing, and drying. The method for extracting tungsten from wolframite ore provided in the present application uses a pressure leaching method using sodium carbonate, a strong basic salt, and water to achieve tungsten extraction, which can not only shorten the process, reduce alkali consumption and production costs, and reduce environmental pollution, but also effectively improve the tungsten leaching rate, and can give full play to the advantages of combining beneficiation with metallurgy to improve the resource utilization rate.

Description

A method for extracting tungsten from wolframite ore Technical Field

[0001] This application relates to the field of tungsten ore processing technology, and in particular to a method for extracting tungsten from wolframite ore. Background Technology

[0002] Wolframite is brown to black in color and has a metallic or submetallic luster. Southern Jiangxi, eastern Hunan, and northern Guangdong in China are world-renowned wolframite producing areas. Wolframite is the most important ore for tungsten refining. Because it contains different proportions of ferrotungstate and manganese tungstate, ore with a higher iron content is called ferrotungstate, and ore with a higher manganese content is called tungstenmanganese ore.

[0003] Currently, the mainstream industrial technology for processing wolframite is the sodium hydroxide decomposition method. This involves first pressure boiling with sodium hydroxide to obtain a crude sodium tungstate solution and alkaline residue. The crude sodium tungstate solution is then diluted with a large amount of water and converted into an ammonium tungstate solution via ion exchange technology. Alternatively, solvent extraction can be used for this conversion. However, the sodium hydroxide decomposition method suffers from several drawbacks: the high price of sodium hydroxide and the high cost of wolframite decomposition; the need for qualified companies to process the alkaline residue, increasing costs; and the environmental pollution caused by ammonia nitrogen wastewater. Summary of the Invention

[0004] This application provides a method for extracting tungsten from wolframite ore, which can improve the technical problems of sodium hydroxide decomposition method in related technologies, such as the high price of sodium hydroxide, the high cost of wolframite decomposition, the need for qualified enterprises to process the alkali boiling residue, which increases costs, and the environmental pollution caused by ammonia nitrogen wastewater.

[0005] This application provides a method for extracting tungsten from wolframite ore, comprising the following steps: adding wolframite ore, a certain amount of sodium carbonate, a strong alkaline salt, and water into a pressure vessel, controlling the temperature and rotation speed, and after leaching is completed, filtering, washing, and drying.

[0006] The technical solutions described above in this application embodiment have at least the following technical effects: using sodium carbonate, strong alkaline salt and water pressure leaching method to extract tungsten can not only shorten the process, reduce alkali consumption and production costs, and reduce environmental pollution, but also effectively improve the tungsten leaching rate, and can give full play to the advantages of beneficiation and smelting combination to improve resource utilization.

[0007] In some embodiments, the wolframite ore includes at least one of ferrotungsten, tungsten manganese ore, or ferrotungsten manganese ore.

[0008] In some embodiments, the strong alkaline salt is at least one of sodium bicarbonate and sodium phosphate.

[0009] In some embodiments, 98% industrial oxygen is used for pressurization, and the oxygen partial pressure inside the pressure vessel is 0.5-0.6 MPa.

[0010] In some embodiments, the mass ratio of the wolframite, the sodium carbonate, and the strong alkaline salt is 40:5-10:6-12, and the solid-liquid ratio is 1:3-5.

[0011] In some embodiments, the leaching temperature is 180-200°C.

[0012] The stirring speed is 700-1000 r / min.

[0013] In some embodiments, the leaching time is 1.5-3 hours.

[0014] In some embodiments, the leaching time is 2 hours. Detailed Implementation

[0015] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the application will be further described in detail below with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Wolframite is brown to black in color and has a metallic or submetallic luster. Southern Jiangxi, eastern Hunan, and northern Guangdong in China are world-renowned wolframite producing areas. Wolframite is the most important ore for tungsten refining. Because it contains different proportions of ferrotungstate and manganese tungstate, ore with a higher iron content is called ferrotungstate, and ore with a higher manganese content is called tungstenmanganese ore.

[0017] Currently, the mainstream industrial technology for processing wolframite is the sodium hydroxide decomposition method. This involves first pressure boiling with sodium hydroxide to obtain a crude sodium tungstate solution and alkaline residue. The crude sodium tungstate solution is then diluted with a large amount of water and converted into an ammonium tungstate solution via ion exchange technology. Alternatively, solvent extraction can be used for this conversion. However, the sodium hydroxide decomposition method suffers from several drawbacks: the high price of sodium hydroxide and the high cost of wolframite decomposition; the need for qualified companies to process the alkaline residue, increasing costs; and the environmental pollution caused by ammonia nitrogen wastewater.

[0018] Based on this, in order to improve the technical problems of sodium hydroxide decomposition method in related technologies, such as the high price of sodium hydroxide, the high cost of decomposing wolframite, the need for qualified enterprises to process the alkali boiling residue which increases costs, and the environmental pollution caused by ammonia nitrogen wastewater, the embodiments of this application provide the following solutions.

[0019] This application provides a method for extracting tungsten from wolframite ore, comprising the following steps: adding wolframite ore, a certain amount of sodium carbonate, a strong alkaline salt, and water into a pressure vessel, controlling the temperature and rotation speed, and after leaching is completed, filtering, washing, and drying.

[0020] This application employs a pressurized leaching method using sodium carbonate, strongly alkaline salt, and water to extract tungsten. This method not only shortens the process, reduces alkali consumption and production costs, and minimizes environmental pollution, but also effectively increases the tungsten leaching rate. It fully leverages the advantages of combining beneficiation and smelting to improve resource utilization.

[0021] It is understood that wolframite ore includes at least one of ferrotungsten, tungsten manganese ore, or ferrotungsten manganese ore.

[0022] The strongly alkaline salt is at least one of sodium bicarbonate and sodium phosphate.

[0023] Pressurized with 98% industrial oxygen, the oxygen partial pressure inside the pressure vessel is 0.5-0.6 MPa.

[0024] The mass ratio of wolframite ore, sodium carbonate, and strong alkaline salt is 40:5-10:6-12, and the solid-liquid ratio is 1:5.

[0025] The stirring speed is 700-1000 r / min.

[0026] The leaching temperature is 180-200℃.

[0027] The leaching time is 1.5-3 hours, with 2 hours being the preferred leaching time.

[0028] Example 1:

[0029] Weigh 200g of ferrotungsten ore into a pressure vessel, add 25g of sodium bicarbonate, 30g of sodium carbonate and 1000g of water, introduce 98% industrial oxygen, set the oxygen partial pressure to 0.5MPa, the leaching temperature to 180℃, the stirring speed to 700r / min, leach for 2h, after filtration, washing and drying, collect the tungsten and calculate the leaching rate.

[0030] The leaching rate of tungsten was calculated to be 98.82%.

[0031] Example 2:

[0032] Weigh 200g of tungsten manganese ore into a pressure vessel, add 50g of sodium bicarbonate, 60g of sodium carbonate and 1550g of water, introduce 98% industrial oxygen, set the oxygen partial pressure to 0.6MPa, the leaching temperature to 200℃, the stirring speed to 1000r / min, leach for 3h, after filtration, washing and drying, collect the tungsten and calculate the leaching rate.

[0033] The leaching rate of tungsten was calculated to be 99.35%.

[0034] Example 3:

[0035] Weigh 200g of tungsten manganese iron ore into a pressure vessel, add 30g of sodium bicarbonate, 45g of sodium carbonate and 1200g of water, introduce 98% industrial oxygen, set the oxygen partial pressure to 0.5MPa, the leaching temperature to 190℃, the stirring speed to 800r / min, leach for 2.5h, after filtration, washing and drying, collect the tungsten and calculate the leaching rate.

[0036] The leaching rate of tungsten was calculated to be 98.98%.

[0037] Comparative Example 1:

[0038] Weigh 200g of ferrotungsten ore into a pressure vessel, add 25g of sodium bicarbonate, 30g of sodium carbonate and 1000g of water, leach at 180℃, stir at 700r / min for 2h, filter, wash and dry, collect the tungsten and calculate the leaching rate.

[0039] The leaching rate of tungsten was calculated to be 90.27%.

[0040] Comparative Example 2:

[0041] Weigh 200g of ferrotungsten ore into a pressure vessel, add 25g of sodium bicarbonate, 30g of sodium carbonate and 1000g of water, introduce 98% industrial oxygen, set the oxygen partial pressure to 0.5MPa, the leaching temperature to 160℃, the stirring speed to 700r / min, leach for 2h, after filtration, washing and drying, collect the tungsten and calculate the leaching rate.

[0042] The leaching rate of tungsten was calculated to be 93.60%.

[0043] It can be seen that the tungsten leaching rates of Examples 1, 2, and 3 are 98.82%, 99.35%, and 98.98%, respectively, which are higher than the tungsten leaching rates of 90.27% and 93.60% of Comparative Example 1 (without oxygen pressurization) and Comparative Example 2 (leaching temperature of 160°C). This is because, under higher temperatures and in the presence of an oxidant, a reaction occurs through the synergistic effect of sodium bicarbonate, sodium carbonate, water, and pressurization, causing tungsten to precipitate from the wolframite. Furthermore, the tungsten leaching reaction is an endothermic reaction, and increasing the reaction temperature can significantly promote the reaction.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for extracting tungsten from wolframite ore, characterized in that, Includes the following steps: Wolf ore, along with a certain amount of sodium carbonate, strong alkaline salt, and water, is added to a pressure vessel. The temperature and rotation speed are controlled. After leaching is complete, the ore is filtered, washed, and dried.

2. The method according to claim 1, characterized in that, The wolframite ore includes at least one of ferrotungsten ore, tungsten manganese ore, or ferrotungsten manganese ore.

3. The method according to claim 1, characterized in that, The strongly alkaline salt is at least one of sodium bicarbonate and sodium phosphate.

4. The method according to claim 1, characterized in that, The pressure vessel is pressurized with 98% industrial oxygen, and the oxygen partial pressure inside is 0.5-0.6 MPa.

5. The method according to claim 1, characterized in that, The mass ratio of the wolframite ore, the sodium carbonate, and the strong alkaline salt is 40:5-10:6-12, and the solid-liquid ratio is 1:3-5.

6. The method according to claim 1, characterized in that, The leaching temperature is 180-200℃.

7. The method according to claim 1, characterized in that, The stirring speed is 700-1000 r / min.

8. The method according to claim 1, characterized in that, The leaching time is 1.5-3 hours.

9. The method according to claim 8, characterized in that, The leaching time is 2 hours.