4 results about "Rhenium" patented technology

The invention discloses a preparation method of high-purity rhenium powder, which comprises the following steps: purification, centrifugal atomization, primary reduction, secondary reduction and the like. A preparation method of high-purity rhenium powder is provided, starting from the two major processes of raw material ammonium rhenate powder preparation and ammonium rhenate calcination reduction, improving the reducibility of ammonium rhenate powder, reducing the driving force of powder growth, and achieving all stages The purity of raw materials is controllable; two-stage hydrogen reduction is adopted to increase the contact with hydrogen, which is conducive to the elimination of water vapor and provides powerful conditions for obtaining finer and more uniform powder.

The invention provides a method for recycling rhenium from copper smelting smoke washing waste acid. The method includes the steps that A, the copper smelting smoke washing waste acid is filtered, and clear waste acid and selenium mud are obtained; B, the clear waste acid is mixed with a first precipitation agent to react, and copper-removed later liquid and copper-deposited slag are obtained; and C, the copper-removed later liquid is mixed with a second precipitation agent to react, rhenium-deposited later liquid and rhenium-rich slag are obtained, and in the clear waste acid, the copper content ranges from 0.2 g/L to 3 g/L; or the method includes the steps that A, the copper smelting smoke washing waste acid is filtered, and clear waste acid and selenium mud are obtained; and D, the clear waste acid is mixed with a precipitation agent to react, rhenium-deposited later liquid and rhenium-rich slag are obtained, and in the clear waste acid, the copper content is larger than 0 g/L and smaller than 0.2 g/L. According to the method, the high-copper waste liquid is subjected to copper and rhenium deposition step by step, the low-copper waste liquid is subjected to rhenium deposition in one step, only one kind of auxiliary material sodium thiosulfate is needed in the whole process, the copper recycling rate ranges from 95.3% to 99.8%, and the rhenium recycling rate ranges from 99% to 99.53%.

The invention discloses a barium-tungsten cathode with high current density and the preparation method of the cathode. The barium-tungsten cathode comprises a cathode molybdenum tube (3) and a double-layer substrate filled in the cathode molybdenum tube (3), wherein the double-layer substrate includes an upper layer and a lower layer; the upper layer is a spherical tungsten powder layer (1) formed by pressing spherical tungsten powder serving as a substrate material and the particle size of the tungsten powder is 4mu m; the lower layer is a tungsten-rhenium alloy layer (2) formed by pressing tungsten powder and rhenium powder which are mixed to serve as the substrate material; and the tungsten powder and the rhenium powder are uniformly mixed in a ratio of 20%:80%. In the barium-tungsten cathode with high current density and a unique structure, the double-layer substrate is adopted, wherein the upper layer is formed by pressing the tungsten powder which has specific shape and specific particle size and serves as the substrate material; and the lower layer is formed by pressing the tungsten powder and the rhenium powder which are mixed to serve as the substrate material, the current density of 100A/cm<2> can be stably supplied, the requirements of high-power and high-frequency microwave devices on the cathode are met, and a powerful guarantee is provided for the development of the microwave devices.

The invention discloses a high-temperature, high-pressure, high-sensitivity and long-life tungsten-rhenium thermocouple which comprises a protection tube, an insulation tube is arranged in the protection tube, a tungsten-rhenium thermocouple wire is installed in the insulation tube, the surface of the tungsten-rhenium thermocouple wire is coated with a coating, a shell is arranged at one end of the protection tube, and an opening is formed in the other end of the protection tube; a sealing groove is formed in the shell, a sealing ring is installed in the sealing groove, a plug is included, the plug and the sealing ring are tightly attached and assembled through a screw, a connecting base is arranged on the plug, and a tungsten-rhenium thermocouple wire penetrates through the plug and is connected with the connecting base. The working area of the tungsten-rhenium thermocouple body and the shell are sealed through the plug, atmosphere isolation between the working area of the thermocouple body and the shell is achieved, leakage is avoided, and the tungsten-rhenium thermocouple is suitable for atmosphere and vacuum conditions. In addition, the coating of the tungsten-rhenium thermocouple wire is good in high-temperature oxidation resistance, high in density, high in overall bonding strength, not prone to disengagement and long in service life.