Low-carbon cement startup Brimstone announced that their US$ 189m award by the US Department of Energy (DOE) is under contract. The Brimstone process for making cement could be revolutionary, because it is almost CO2 free. Instead of limestone and the material decomposition in the heating process, complex calcium silicate rocks are processed. It will use a two acid approach with heating of intermediate products in a rotary kiln to produce ASTM-approved cements, SCM products and smelter-grade alumina (SMA). For the future of the aluminium production it is vital to explore non-bauxite Al2O3 resources. Brimstone will setup a commercial plant for 0.14 Mta cement in Reno in Nevada by 2030 while avoiding 0.12 Mta CO2.