Device and method for carrying out magnesium reduction and deoxidization on tantalum powder
A tantalum powder and oxygen reduction technology, which is applied in the field of tantalum powder and magnesium reduction and oxygen reduction, can solve problems such as economic loss, tantalum powder pollution, and blocked pipelines, and achieve the effects of reducing pollution, less loss of tantalum powder, and simple installation
Active Publication Date: 2013-11-27
江门富祥电子材料有限公司
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Problems solved by technology
Except for a small part of the excess magnesium in the tantalum powder being adsorbed by the surface of the tantalum powder, most of the rest exists in the bottom of the crucible in liquid form. Then, if the pressure in the reaction vessel is lower than 134.9mm Hg at 927°C when evacuating, it will Boiling the excess liquid magnesium in the tantalum powder crucible causes the tantalum powder to be sprayed into the reaction vessel, the heat shield, or even pumped into the vacuum pipeline, blocking the pipeline, and the part of the tantalum powder that can be collected is also polluted, causing serious economic problems. loss
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[0053] Add 100kg of tantalum powder with an oxygen content of 6800ppm to 2000g of magnesium powder, (based on theoretically removing all oxygen from the tantalum powder, 1020g of magnesium is needed for the remaining 980g of magnesium after the reaction is completed-in fact it cannot be completely removed), Mix the magnesium powder and tantalum powder evenly, put them into 11 tantalum crucibles 16 respectively, and put the crucible 16 containing the tantalum powder 17 mixed with magnesium powder into figure 1 In the reaction vessel 10, the reaction vessel 10 is hoisted into the pit furnace 14, the cooling water pipe 13 is opened, water is taken in from the water inlet pipe 131, and discharged from the drain pipe 132; the exhaust pipe 20 is evacuated to about 200 Pa, and the evacuation is stopped. Then fill the argon gas into the reaction vessel 10 from the pipe 19, keep the pressure in the reaction vessel 10 at 0.11MPa~0.14MPa, raise the temperature to make the temperature at A,...
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Abstract
The invention discloses a device for carrying out magnesium reduction and deoxidization on tantalum powder, which comprises an electrical heating pit furnace and a cylindrical reaction vessel, wherein the cylindrical reaction vessel is arranged in the pit furnace; the reaction vessel mainly comprises an argon gas feed tube, a gas discharge tube, a thermocouple tube, and a crucible filled with tantalum powder; a heater is arranged at the outside of the reaction vessel at the position of the crucible; the crucible is arranged on the lower part of the reaction vessel; a magnesium collector is arranged above the tantalum powder crucible; a lower heat-insulating screen is arranged between the magnesium collector and the tantalum powder crucible; an upper heat-insulating screen is arranged above the magnesium collector; a cooling device is arranged at the outside of the reaction vessel at the position of the upper heat-insulating screen; and the argon gas feed tube extends to the inside of the bottom of the reaction vessel. The invention also provides a magnesium reduction and deoxidization process for tantalum powder by using the device. The magnesium reduction and deoxidization for tantalum powder is performed according to the invention, so that the loss of tantalum powder is less, the oxygen content of tantalum powder is low, and the recovered magnesium metals can be reused, thereby reducing the pollution to the environment.
Description
Technical field [0001] The present invention relates to a tantalum powder magnesium reduction oxygen reduction device, and also to a method for using the tantalum powder magnesium reduction oxygen reduction device. Background technique [0002] Tantalum is a rare and precious metal, and one of its important uses is to make electrolytic capacitors. Tantalum powder used as a capacitor requires high purity. The production of capacitor grade tantalum powder is usually in the presence of diluent salts (such as NaCl, KCl and KF, etc.) with metallic sodium (Na) to reduce potassium fluorotantalate (K 2 TaF 7 ) The obtained product containing tantalum powder, alkali metal and polybasic salt is washed with water to obtain tantalum powder, followed by acid washing and water washing. After washing, the tantalum powder must be subjected to vacuum heat treatment to meet the requirements for making electrolytic capacitors. However, because tantalum metal has a great affinity for oxygen, the ta...
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IPC IPC(8): C22B34/24C22B5/04B22F9/24
CPCY02P10/20
Inventor 郑祥云廖志刚朱德忠
Owner 江门富祥电子材料有限公司