Calcination: Difference between revisions
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*Quicklime is $120/metric ton (MT) in 2015 [https://www.indexmundi.com/en/commodities/minerals/lime/lime_t5.html] | *Quicklime is $120/metric ton (MT) in 2015 [https://www.indexmundi.com/en/commodities/minerals/lime/lime_t5.html] | ||
*280MMT are produced per year [https://www.diva-portal.org/smash/get/diva2:309947/FULLTEXT01.pdf], or about 33B market | *280MMT are produced per year [https://www.diva-portal.org/smash/get/diva2:309947/FULLTEXT01.pdf], or about 33B market | ||
*4MJ/kg of quicklime produced. | *4MJ/kg of quicklime produced for shaft kiln. The theoretical heat requirement for dissociation of CaCO3 is about 3,15 MJ | ||
per kg of lime. The rotary kiln consumes about 8 MJ per kg of lime. [https://www.diva-portal.org/smash/get/diva2:309947/FULLTEXT01.pdf] | |||
=Lime Production (Calcination and More)= | =Lime Production (Calcination and More)= | ||
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[https://docs.google.com/presentation/d/1fAx_4HMWuRhPEDJhxSyQ2cycm2-zxn648hKYfCCDE2A/edit#slide=id.gb328b2d63d_0_9 edit] | [https://docs.google.com/presentation/d/1fAx_4HMWuRhPEDJhxSyQ2cycm2-zxn648hKYfCCDE2A/edit#slide=id.gb328b2d63d_0_9 edit] | ||
=Parts= | |||
*Kanthal heater tubes - [https://www.kanthal.com/en/products/furnace-products/furnace-tubes/] - radiant heaters are already protected from chemical and thermal shock | |||
*Alumina tubes - with kanthal heater wire outside? [https://www.sentrotech.com/products/alumina/#:~:text=Alumina%20combines%20low%20thermal%20expansion,atmosphere%20at%20an%20extreme%20temperature.] | |||
*Graphite tube - $500 for 3' of 2" ID - [https://www.graphitestore.com/purified-graphite-tube-2-5od-x-2id-x-36l-mt001104]. This should work as calcium carbide is formed only at much higher temperatures compared to lime production. | |||
Latest revision as of 02:59, 7 June 2021
- Wikipedia - [1]
Kanthal heaters for limestone production - [2]- Calcium oxide is quicklime [3]
- Quicklime is $120/metric ton (MT) in 2015 [4]
- 280MMT are produced per year [5], or about 33B market
- 4MJ/kg of quicklime produced for shaft kiln. The theoretical heat requirement for dissociation of CaCO3 is about 3,15 MJ
per kg of lime. The rotary kiln consumes about 8 MJ per kg of lime. [6]
Lime Production (Calcination and More)
Parts
- Kanthal heater tubes - [7] - radiant heaters are already protected from chemical and thermal shock
- Alumina tubes - with kanthal heater wire outside? [8]
- Graphite tube - $500 for 3' of 2" ID - [9]. This should work as calcium carbide is formed only at much higher temperatures compared to lime production.