两段碳酸化法分离氧化铝和氧化镓的研究

Separation of alumina and gallium oxide by two-stage carbonization method

为了从高铝粉煤灰中提取含量可控的氧化镓和氧化铝的混合物,利用氢氧化镓与氢氧化铝在碱性溶液中析出的酸度不同,采用两段碳酸化的方法,分离出一定量的氧化铝,得到氧化镓和氧化铝的混合物。探讨了第一次碳酸化条件(即不同p H、不同流量、不同温度)对氧化铝和氧化镓分离效果的影响。实验结果表明:p H值为11.23,温度为80℃,CO_2流量为40 m L/min时,最终得到的氧化镓和氧化铝的混合物中,镓的含量为5.7550 mg/g。

In order to extract mixture of alumina and gallium oxide from high-aluminum fly ash,the separation of alumina and gallium oxide with two-stage carbonization method was studied according to the difference of acidity between gallium hydroxide and aluminum hydroxide precipitation in alkaline solution. A certain amount of alumina was isolated. Taking the first-stage carbonization process as research object,the influence of p H,flow rate and temperature on the separation of alumina and gallium oxide. The results showed that,when the p H was 11. 23,the temperature was 80 ℃,the flow rate of CO2 was 40 m L / min. The content of Ga in the mixture could reach 5. 7550 mg / g.