The process of impurity removing from fine silica powders with thermal crack method is investigated by means of DTA and XRD.

通过显微镜观察和X -射线衍射分析方法，研究用热爆裂法除去二氧化硅微粉中杂质的过程。

youdao

Through controlling the sodium silicate of surfactans and the pH of quartz powder suspending liquid, the ultra-fine silica powder was prepared by using stirred mill.

通过控制硅酸钠的添加量和悬浮液的pH值，利用搅拌磨制备出了超细石英粉体。

youdao

Heating husks to 800 degrees centigrade (1,472 degrees Fahrenheit) in an oxygen-free furnace drives off carbon, leaving fine particles of nearly pure silica behind.

在无氧炉中将糠皮加热到800摄氏度(1472华氏度)将分离糠皮中的碳，留下几乎只含有硅的细小微粒。

youdao

Carbon is driven out, and fine particles of almost pure silica remain.

VOA: special.2009.12.01

When he shone a light up through it, he could see fine-grained particles of silica, known as chert, mixed in with what looked like coal.

NEWYORKER: The Martian Chroniclers