铍矿浸出中和液室温循环沉淀工艺试验研究

Experimental study on room temperature circulating precipitation process of beryllium ore leaching neutralization liquid

目前铍矿浸出生产Be(OH)_(2)工艺一般在煮沸的条件下加入氨水至浸出中和液并搅拌进行沉淀,导致能耗增加、大量氨水挥发,挥发出的氨气有强烈刺激性气味并携带含毒性铍物质,严重影响工人的工作环境。针对此问题,本研究在室温条件下进行了中和液循环沉淀试验,试验结果表明:从第1次至第5次循环沉淀时,悬浊液沉淀体积明显上升,进行到第10次后,悬浊液沉淀体积保持平稳波动,分层现象明显,每次沉淀的氨水消耗量均在55-65 mL,悬浊液沉淀体积稳定在2 500-2 800 mL;相较于现有工艺,氨水消耗量降低近70%,Be(OH)_(2)中BeO含量及杂质含量与现有生产方式相当。该试验工艺很大程度上节省氨水用量、减少加热设备的投入、降低能源消耗、降低操作岗位的安全风险,为后续铍中和液沉淀工序的改进提供了可行性参考。

At present,the production of Be(0H)_(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 55-65 mL,and the volume of suspension precipitated is stable in the range of 2500-2800 mL.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.