China Nonferrous Metallurgy

At present, the production of Be(OH)₂ by leaching neutralization liquid of beryllium ore is generally added to ammonia water for stirring and precipitation under boiling conditions, resulting in increased energy consumption and a large amount of ammonia volatilization, volatile ammonia has a strong pungent odor and carries toxic beryllium substances that seriously affect the working environment of workers.In order to reduce energy consumption and reduce the volatilization of ammonia, the neutralization liquid circulating precipitation test was carried out under room temperature conditions.The test results show that the volume fluctuation of suspension precipitatant increases when the 5th cycle precipitation is carried out, and after the 10th cycle, the volume of suspension precipitatant remains stable and fluctuate, and the phenomenon of stratification is obvious, the ammonia consumption of each precipitation is 55~65mL, and the volume of suspension precipitated is stable in the range of 2500~2800mL. Compared with the existing process, ammonia consumption is reduced by nearly 70%, and the BeO content and impurity content in Be(OH)₂ are comparable to the existing production methods.The process greatly saves amount of ammonia water, reduces investment of heating equipment, reduces energy consumption, and reduces safety risk of the operation position, which provides some feasible references for the improvement of beryllium neutralization and liquid precipitation process in the future.