| 发明名称 |
METHOD FOR PRODUCING SiO2 GRANULATE |
| 摘要 |
The invention relates to a process for producing SiO2 granules by freezing and re-thawing an SiO2 suspension, wherein a separation of liquid and sediment composed of agglomerated SiO2 particles occurs in the course of thawing, the liquid removed is decanted and the residual moisture in the sediment is removed by a drying step with formation of the SiO2 granules. According to the invention, an auxiliary comprising alkali metal-free bases in the form of nitrogen hydrides is added to the suspension to set the pH greater than 7. |
| 申请公布号 |
US2015086462(A1) |
申请公布日期 |
2015.03.26 |
| 申请号 |
US201314397484 |
申请日期 |
2013.04.25 |
| 申请人 |
Heraeus Quarzglas GmbH & Co. KG |
发明人 |
Such Mario;Schoetz Gerhard;Langner Andreas |
| 分类号 |
C01B33/18 |
主分类号 |
C01B33/18 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A method for producing a SiO2 granulate, said method comprising:
providing a suspension containing SiO2 particles in an aqueous liquid, freezing the suspension and removing the liquid, including thawing the frozen SiO2 suspension so as to form a liquid phase and a sediment of agglomerated SiO2 particles, removing the liquid phase and drying the sediment so as to remove residual moisture and so as to form the SiO2 granulate, wherein the suspension contains an addition of alkali-free bases in the form of nitrogen hydrides such that the suspension has a pH more than 7. |
| 地址 |
Hanau DE |
