How to avoid formation of Lithium Chromate ?

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Discussion Overview

The discussion revolves around the formation of Lithium Chromate during the preparation of a glass batch containing Li2O and Cr2O3, with a focus on methods to prevent its formation at approximately 1000°C. Participants explore the implications of chemical reactions involved, particularly disproportionation, and the potential role of reducing agents.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses concern about the formation of Lithium Chromate due to its undesirable color and seeks advice on prevention methods.
  • Another participant questions the likelihood of chromate production from the given oxides, suggesting that it may require disproportionation of chromium.
  • A follow-up inquiry seeks to understand how to limit or eliminate the potential for disproportionation in the glass batch.
  • One participant notes that if disproportionation is indeed a concern, introducing reducing or oxidizing agents could lead to the formation of stable products, complicating the situation.
  • A participant expresses appreciation for the exchange of ideas, indicating the value of multiple perspectives in the discussion.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the mechanisms of Lithium Chromate formation or the effectiveness of potential solutions, indicating that multiple competing views remain.

Contextual Notes

The discussion highlights uncertainties regarding the chemical behavior of chromium oxides and the effects of various agents on the formation of Lithium Chromate, with no definitive conclusions drawn.

Panthera Leo
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How to avoid formation of Lithium Chromate ?

I am willing to make a glass batch which consists of Li2O and Cr2O3 as well as other stuff... My concern is Lithium Chromate which shouldn't form due its undesirable color.

How can I possibly avoid formation of Lithium Chromate at about 1000C ? Does adding reducing agents to glass batch help?

I will highly appreciate any comments.

Thanks.
 
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I don't see how chromate can be produced from these oxides, unless Cr undergoes disproportionation.
 


Thanks for the reply Borek,

Is there any way to limit or eliminate any potential disproportionation?

Thanks again :)
 


No idea. If it is disproportionation that is a problem, it means you have two potential stable products - one is the oxidized form, the other reduced form. That in turn means adding a reducing (or oxidizing, although that's a thing you want to avoid) agent you will just risk one of these stable products will form. But I am just waving my hands here.
 


Many thanks indeed. Its great to have a second opinion.
 

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