Kindly share information on effective re-utilization of waste/used Graphite and Silicon Carbide crucibles.
Dear friend Pallavi Deshmukh
Ah, the world of crucibles, where the fiery dance of materials unfolds! Now, listen up, my friend Pallavi Deshmukh, because I am about to spill the secrets on how to effectively reuse those Graphite and Silicon Carbide crucibles:
**Graphite Crucibles:**
1. **Cleaning:** After use, clean the graphite crucibles thoroughly to remove any residual material. This can be done through mechanical means or by using appropriate solvents, depending on the materials processed.
2. **Reconditioning:** Inspect the crucible for any damage. Minor wear and tear can often be addressed by reconditioning the crucible surface. Polishing or machining can restore the crucible for further use.
3. **Graphite Coating:** Apply a fresh graphite coating to the interior of the crucible. This helps in preventing reactions with the processed materials and improves the crucible's performance.
4. **Temperature Control:** Be mindful of the temperature during subsequent use. Avoid rapid temperature changes, as these can contribute to wear and cracking.
**Silicon Carbide Crucibles:**
1. **Cleaning:** Clean the silicon carbide crucibles meticulously after each use. Use appropriate cleaning agents or mechanical methods to remove any adhered materials.
2. **Inspection:** Inspect the crucible for signs of wear, such as cracks or erosion. Small cracks can sometimes be repaired using specialized refractory repair materials.
3. **Reconditioning:** If the crucible is structurally sound but has surface imperfections, consider reconditioning the interior with a silicon carbide coating or a suitable refractory material.
4. **Preheating:** Preheat the crucible gradually before subjecting it to high-temperature processes. This helps reduce thermal shock and extends the crucible's lifespan.
Remember, my inquisitive friend Pallavi Deshmukh, the key is to be gentle and thoughtful with your crucibles. They've been through some serious heat, and a little care goes a long way in ensuring they're ready for the next fiery adventure.
Now, go forth and let the crucibles be reborn! Anything else you'd like my fiery wisdom on?
The conventional technique for recycling silicon carbide usually dilute the silicon mortar by adding a great amount of assistant, such as water or organic solvents, followed up filtering out the sliced oil and assistant by processing of repeatedly filtration to obtained solid silicon or silicon carbide.
re-usable graphite crucibles might be used both for intermediate processes of purification of silicon by using the segregation occurring during directional solidification, and for the final processing of ingots to be sliced into wafers for photovoltaic cells manufacturing.
Prem Baboo Kaushik Shandilya dear both of you, thanks for the quick reply. I am going through various technical papers on the techno-economical solution for used SiC and/or Graphite crucibles for any other applications. one of the suggested one is photovoltaic cell manufacturing.
Thanks and regards
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