How to remove arsenic when smelting polysilicon by physical method?
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Arsenic has never been noticed in previous experiments. When reaching 5N, one day I suddenly discovered that there was an arsenic element in the mixed standard solution. I measured it by the way, but I didn't know that the content was as high as 5ppm. Then I followed the pickling, boron removal, phosphorus removal, and directional solidification processes, and found that arsenic decreased only slightly throughout the entire route. I don’t know about physical methods, what is a good way to remove arsenic?
When I heard it for the first time, I still had to consider arsenic. Shouldn’t I just consider b p?
Arsenic is generally not considered. Most only consider P, B, Te, etc.
When selecting silica, it is generally low arsenic. It is not clear to what extent the subsequent treatment is required. I have not heard of this.
There should not be such high arsenic. As long as the raw materials are strictly controlled, arsenic can be controlled below 1PPM.
The original poster is also engaged in physical polysilicon. Can you tell me which company it is from?
I guess there seems to be a problem with one family in Jingdezhen, Jiangxi! Continue to pay attention to the opinions of the prawns!
5ppm of arsenic is very high. However, there is still relatively little discussion on this element at present. Will it be used as an ingredient like corn?
We do use physical methods. Now we control the raw materials and solve the problem. They are all below 1ppm.
The poster doesn't know your metallurgical method, what are the requirements for silicon powder raw materials? Can you tell me?