Magnesium Rocket

I had previously proposed a flying wing for a Space Ship design. Unfortunately it is technically impossible to build a single stage long range space ship with chemical propulsion. However my flying wing design can still be used as a reusable first stage Space Ship. This stage would reach Low Earth Orbit (~300km) with heavy cargo. As a second stage I propose a single use rocket with solid fuel. The second stage rocket will be made of Magnesium which also serve as the solid fuel. Mg/CO₂ propellent is studied by NASA in 2007.  https://ntrs.nasa.gov/api/citations/20080002287/downloads/20080002287.pdf  CO₂ can be easily stored in solid form making it a total solid fueled rocket. The third stage of the Space Ship would be released from the second stage before the structural Magnesium outer shell of the second stage is consumed. The second stage would keep burning till most of it is consumed including its outer shell. This yields minimum Space Debris. The final speed of  the second stage would exceed the escape velocity so no debris would fall on the Earth.