Separating TeO2 from SiO2 - Chemistry Tips

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Discussion Overview

The discussion revolves around methods for separating tellurium dioxide (TeO2) from silicon dioxide (SiO2), exploring various chemical approaches and physical properties relevant to the separation process.

Discussion Character

  • Technical explanation
  • Experimental/applied

Main Points Raised

  • One participant suggests using bromoform due to its specific gravity, which allows TeO2 to sink while SiO2 floats.
  • Another participant reiterates the bromoform method and introduces hydrochloric acid (HCl) as a potential alternative, noting that TeO2 dissolves in HCl while SiO2 does not.
  • A later reply mentions the possibility of using HCl to produce tellurium tetrachloride (TeCl4) as part of the separation process.

Areas of Agreement / Disagreement

Participants present multiple methods for separation, with no consensus on the best approach, indicating that various techniques may be explored without agreement on a definitive solution.

Contextual Notes

The discussion does not clarify the effectiveness or limitations of the proposed methods, nor does it address potential side reactions or conditions required for the separation processes.

little doctor
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How we can separate TeO2 from SiO2 ? :redface: :frown:
 
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The specific gravity of TeO2 is 5.9. Alpha quartz is the densest form of silica and has a SG of 2.648.

Try using bromoform (SG 2.88). Silica will float and TeO2 will sink.
 
chemisttree said:
The specific gravity of TeO2 is 5.9. Alpha quartz is the densest form of silica and has a SG of 2.648.

Try using bromoform (SG 2.88). Silica will float and TeO2 will sink.

what about using HCl

TeO2 dissolves in HCl

but SiO2 not

?:frown: :redface: :frown:
 
If you want to make TeCl4, try HCL.
 

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