A method for reducing the amount of ammonia used in the hydrometallurgical process of tantalum and niobium

A hydrometallurgy and usage-amount technology, applied in the field of non-ferrous metal production, can solve the problems of large ammonia-containing wastewater, high operating costs, and unclean treatment

Inactive Publication Date: 2016-08-31
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, a large amount of ammonia gas needs to be consumed, and a large amount of ammonia-containing wastewater is produced. Although there are follow-up treatment devices, the current treatment devices have many difficulties such as high operating costs and unclean treatment.

Method used

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  • A method for reducing the amount of ammonia used in the hydrometallurgical process of tantalum and niobium
  • A method for reducing the amount of ammonia used in the hydrometallurgical process of tantalum and niobium

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example 1

[0016] The niobium-containing acid solution (niobium solution) in tantalum-niobium hydrometallurgy is 1000L, its content is: niobium oxide 90g / L, hydrofluoric acid acidity 2.5mol / L, sulfuric acid acidity 0.75mol / L. 190L of 98% concentrated sulfuric acid was added to this solution to adjust the sulfuric acid acidity of the niobium-containing acid solution (niobium solution) to 3.5mol / L. In a countercurrent mixed extraction tank, MIBK is used as the extraction agent, and the flow ratio is O / A equal to 1:1 to extract the acidic solution containing niobium. In the second extraction tank, pure water is used as the stripping agent to back-extract the MIBK containing niobium-containing acid solution, and the flow ratio is controlled so that O / A is equal to 1:1, and 1000L of niobium-containing acid solution is obtained by back-extraction. Yes: niobium oxide 89g / L, hydrofluoric acid acidity 2.4mol / L, sulfuric acid acidity 0mol / L. Then use 50 kg of ammonia gas to precipitate until the ...

example 2

[0020] In the tantalum-niobium hydrometallurgy, the acid solution containing tantalum is 1000L, its content is: tantalum oxide 50g / L, hydrofluoric acid acidity 0.7mol / L, add 40% hydrofluoric acid 70L, potassium chloride 40 to this solution kg, heat preservation at 92 degrees Celsius for 1 hour, then cool to room temperature, filter and crystallize to obtain the potassium fluorotantalate product. At the same time, 1300L of mother liquor with an acidity of 1.5mol / L and a content of tantalum oxide of 1.5g / L was produced, and 62 kg of sodium hydroxide was added to the solution to neutralize to a pH of 5-6, and then 9 kg of ammonia gas was introduced. When the pH value of the solution reaches 8-9, it is filtered and washed to obtain 3200 L of ammonia-containing wastewater, and the content of ammonium nitrogen in the water is 1.68 g / L.

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Abstract

The invention relates to a method for reducing usage amount of ammonia gas during the process of tantalum-niobium hydrometallurgical extraction. The method is as follows: 1, concentrated sulfuric acid is added into a niobium-containing acid solution to reduce acidity of the niobium-containing acid solution, and MIBK extraction, back-extraction, ammonia gas neutralization and the like are carried out to prepare a niobium oxide product; 2, as potassium fluotantalate is separated and extracted from a tantalum-containing acid solution by crystallization and filtration processes, a part of fluorotantalic acid is left in a mother liquor. In the prior art, ammonia gas must be utilized for neutralization and recovery. Thus, a lot of ammonia-containing wastewater is caused. According to the invention, part of alkaline matters (such as sodium hydroxide, magnesium hydrate, calcium hydroxide and the like) are used to replace ammonia gas and added into a mother liquor containing a fluorotantalic acid solution, and then ammonia gas is used for neutralization. Through the above two measures, the purpose of reducing consumption of ammonia gas and decreasing discharge of ammonia-containing wastewater is finally achieved.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal production, in particular to a method for reducing the amount of ammonia used and the discharge of ammonia-containing wastewater in the tantalum-niobium hydrometallurgy process. Background technique [0002] Ammonia-containing wastewater has a greater impact on the environment, when ammonia dissolves in water. A part of the ammonia reacts with water to form ammonium ions, and a part forms hydrated ammonia. Also known as non-ionic ammonia. Ammonia ions are relatively non-toxic. Non-ionic ammonia is the main factor that causes aquatic organisms poisoning. Its toxicity is dozens of times greater than that of ammonia salt, and it increases with the increase of alkalinity. The concentration of free ammonia should be controlled below 0.1 mg / L. Especially when ammonia is converted into nitrate, an intermediate substance called nitrite is produced in the process. Nitrite is highly toxic to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/26C22B34/24
CPCY02P10/20
Inventor 鲁东马应利陈宗强喻文斌谢南海石晓军李明阳葛立志白掌军
Owner NINGXIA ORIENT TANTALUM IND
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