The company has yet to chose a site to produce green cement — and alumina ... instead leveraging abundant U.S.-sourced calcium silicate rocks to produce alumina. This innovation has the ...

California-based startup Brimstone is producing alumina as a byproduct of a low-carbon alternative to cement. A low-carbon concrete company backed by the Department of Energy says that it will ...

Particular attention has been given to special cements, including refractory calcium aluminates, acid-base reaction cements and calcium sulfoaluminate cements. The effect of temperature and the ...

Brimstone replaces bauxite with carbon-free calcium silicate rocks ... to build a first-of-its-kind plant to deliver cement, SCM, and alumina.