How to raise temp up to 1000 degree C in kiln?

Most of answer on how to make white charcoal is to slowly burnt and quickly raise temp to 1000 degree C and quickly cool down by sand, dirt and ash.
But how to raise temp to 1000 degree is the problem because most of the kiln can make around 500 to 800 degree only. Any body know to raise temp in kiln up to 1000-1200 degree?



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