There are many ways to recover hydrazine comprehensively. The common method of chlorination distillation is commonly used. The method is to convert the hydrazine in the raw material into a sulfuric acid solution, add the tannin to obtain a tannin precipitate, and after oxidizing and roasting to remove arsenic and detoxification, chlorination at 83 to 100 ° C to obtain GeCl4. The following reactions occur during the chlorination distillation:
GeCl4 is hydrolyzed to obtain pure GeO2, and the following reactions occur during the process:
GeO2 and hydrogen is reduced to give metallic germanium having from about 10 ~ 20Ω · cm resistivity, the reaction is:
(1) Recovery by preferential evaporation method
Firstly, the raw materials are pelletized, and the volatile sulphide is reduced by 90% to 98%. Then the dust is extracted according to the classical method, and the recovery rate of strontium is said to be as high as 90%. In China, this method has been used to extract yttrium from zinc concentrate containing 0.006% to 0.008% Ge. After two reductions and volatilization, the obtained sulphide dust is extracted by the classical method, and the recovery rate of strontium is 75% to 80%. .
(2) Sulfation-carrier precipitation method for recovery of ruthenium
After this treatment method Zaire germanium containing 0.022% germanium deposit, by flotation to obtain a germanium containing 0.13% of copper concentrate, copper smelter obtained by containing 0.36% Ge dust, sulfated germanium into sulfuric acid system, purification The ruthenium in the solution was precipitated using MgO as a carrier, and then extracted by a classical method. The Belen plant in Belgium is produced using this method, and the recovery rate of hydrazine is 75%.
(3) Recovery of hydrazine by alkaline earth metal chloride distillation.
(4) Tobacco recovery by recovery.
(5) Redox roasting recovers hydrazine.
(6) Re-evaporation and recovery of hydrazine.
(7) Extraction method for recovery
In recent years, domestic and solvent extraction of germanium larger research progress, germanium extracted coal oil can be used, CCl4, MIBK, Lix63 system in diethyl ether and hydrochloric acid; sulfuric acid in the system available TOA, P204 + YWl00, Lix63 and the like Kelexl00 Extraction of hydrazine, this method can be produced according to the specific conditions.
(8) The blast furnace is used to recover hydrazine.
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