Lime Kiln: Difference between revisions

Revision as of 02:20, 30 January 2026

Lime Kiln Calculations - $2400 for a minimum 100kW heater element for 1 ton batch kiln, lasts 150-300 heats.
Bulk lime is $150-200 per ton - 10 cents per lb.
Around 1.4 kwhr/kg of lime production - or 1400Mwhr for a ton
Basic cost of open source - with 1 Cent Solar - we have 1400 kWhr * 1 cent/kWhr = $14 in electricity
Absolute base cost is $14 energy and $12 in Kanthal A1 wear - making a 100 lb sack of concrete mix come out to $3, which is near zero marginal cost.
It's worth doing. For 3000 psi concrete, need to use Metakaolin mixed during cement mix phase, Commercially, they fire with 20% clay-containing limestone at slightly higher temperature, 1200C. But can do pure limestone at 1100 and then add metakaolin.
Otherwise, get lime concrete at 1500 PSI.

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-*Lime Kiln Calculations - $2400 for a minimum 100kW heater element for 1 ton batch kiln, lasts 50-300 heats.
+*Lime Kiln Calculations - $2400 for a minimum 100kW heater element for 1 ton batch kiln, lasts 150-300 heats.
 *Bulk lime is $150-200 per ton - 10 cents per lb.
 *Around 1.4 kwhr/kg of lime production - or 1400Mwhr for a ton
 *Basic cost of open source - with [[1 Cent Solar]] - we have 1400 kWhr * 1 cent/kWhr = $14 in electricity
-*Absolute base cost is $14 energy and $24 in [[Kanthal A1]] wear - making a 100 lb sack of concrete mix come out to $4, which is near zero marginal cost.
+*Absolute base cost is $14 energy and $12 in [[Kanthal A1]] wear - making a 100 lb sack of concrete mix come out to $3, which is near zero marginal cost.
+*It's worth doing. For 3000 psi concrete, need to use [[Metakaolin]] mixed during cement mix phase, Commercially, they fire with 20% clay-containing limestone at slightly higher temperature, 1200C. But can do pure limestone at 1100 and then add metakaolin.
+*Otherwise, get lime concrete at 1500 PSI.