You need a temperature of about 1000°C to fire bricks, but more is better to get the moisture out. From cursory googling around it seems that a solar kiln woul

You need a temperature of about 1000°C to fire bricks, but more is better to get the moisture out. From cursory googling around it seems that a solar kiln wouldn't cut it, unless perhaps a very large solar collector was used... which upon further cursory googling yielded this: https://helioscsp.com/concentrated-solar-power-for-high-temperature-solar-process-heat/ https://helioscsp.com/concentrated-solar-power-for-high-temp... https://cordis.europa.eu/article/id/421794-the-next-solar-revolution-could-power-cement-production-with-sunlight https://cordis.europa.eu/article/id/421794-the-next-solar-re...