Process to convert reduced sulfur species and water into hydrogen and sulfuric acid

A method for producing a cement material comprising:

• (a) reacting a first acid and a first cement precursor comprising an element selected from the group consisting of Ca, Si, and Al or a combination thereof to form a second cement precursor, compositionally different from the first cement precursor, wherein the second cement precursor comprises an element selected from the group consisting of Ca, Si, and Al or a combination thereof, and a conjugate base of the first acid;
• and
• (b) converting the second cement precursor to a cement material, compositionally different from the first and second cement precursors, wherein the cement material is a Portland cement, and wherein converting the second cement precursor to the cement material comprises thermally converting the second cement precursor by sintering or thermally decomposing the second cement precursor, thereby forming the cement material, wherein the step of sintering or thermally decomposing comprises treating the second cement precursor at a temperature selected from the range of 500 to 2000° C.