TL;DR: Solar Thermal Processing is a main entry in the 外星矿物知识引擎 database.
Using concentrated sunlight to heat materials to extreme temperatures for sintering, melting, or vaporization
Input Material
Regolith, asteroid material
Output
Sintered/melted products, volatilized gases
Efficiency
Limited by solar flux and concentrator size; free energy source
Space Viability
Excellent - abundant solar energy; demonstrated for regolith sintering