School of Chemistry and Chemical engineering, Jiangsu University, Zhenjiang 212013, PR China.
Environ Sci Technol. 2010 Oct 1;44(19):7673-7. doi: 10.1021/es101104c.
A much "greener" and harmless leaching method for removing impurity aluminum further from industrial quartz sands by very dilute mixed acids has been presented. With the help of supersonic, the percentage of removal aluminum reached up to 52.5%/53%, that is, 17.4 ppm/17.7 ppm at 30 °C/80 °C, respectively. These results are 4.4/4.7 ppm lower than that supplied by a world famous quartz sands supplier, and the leaching conditions are much milder compared with other comparable methods: the concentration of hydrogen chloride in the mixed acid is only 10% of the others, the leaching temperature is much lower; at the same time, the operating time is only 13-20% of the others, thereby pollution of industrial strong acids and thermo-scattering is reduced substantially.
提出了一种从工业石英砂中进一步去除杂质铝的更为环保和无害的浸出方法，即用非常稀的混合酸。在超声波的帮助下，铝的去除率达到了 52.5%/53%，即在 30°C/80°C 下分别为 17.4 ppm/17.7 ppm。这些结果比世界著名的石英砂供应商提供的结果低 4.4/4.7 ppm，与其他可比方法相比，浸出条件要温和得多：混合酸中的盐酸浓度仅为其他方法的 10%，浸出温度要低得多；同时，操作时间也仅为其他方法的 13-20%，从而大大减少了工业强酸和热散射的污染。
