The most effective separation technique of hydrazine to date is the absorption of oxidative distillation-hydrochloric acid solution. Therefore, the refining of hydrazine is mostly based on the hydrazine absorption liquid, and the key is to effectively separate the hydrazine in the hydrazine absorption liquid. In a hydrogen stream and then raised to 950 deg.] C, cooled to room temperature to obtain the metal powder nails, sealed immediately transferred to the dryer after removing oxidized in the air to prevent evaporation. Kunming Precious Metal Research Institute's corporate standards /% species Ru Ir PdRh PtAu Ag Cu Al FeNiPb Total amount of impurities Expensive Ru-1 99.98 0.006 0.0005 0.003 0.0000625 0.00008 0.0015 0.001 0.01 Expensive Ru-2 99.95 0.013 0.001 0.006 0.000125 0.00016 0.003 0.002 0.02 Expensive Ru-3 99.9 0.025 0.002 0.012 0.00025 0.00032 0.006 0.004 0.05 LC Two-axis Servo Robot Arm,Servo Robot Arm,Strong Robot Arm Ningbo Rainbow Plastics Machinery Co., Ltd. , https://www.injection-machine.com
Add a small amount of ethanol to the high concentration hydrazine hydrochloric acid absorption solution, heat to 75-90 ° C to remove the free chlorine gas, keep the hydrazine in the H 2 RuCl 6 state, add appropriate amount of hydrogen peroxide or nitric acid to fully oxidize and volatilize ruthenium tetroxide, and slowly concentrate the solution to Containing strontium 30-50g/L, adding ammonium chloride to precipitate dark red (NH 4 ) 2 RuCl 6 crystal:
H 2 RuCl 6 +2NH 4 Cl=====(NH 4 ) 2 RuCl 6 ↓+2HCl
After filtration, the crystals are washed with ethanol, dried in a hydrogen stream, and slowly heated to 450-500 ° C to decompose the ammonium salt: 
The enterprise standards of the Kunming Institute of Precious Metals in China are listed in the table.