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The MgO-unit is used for the production of magnesium oxide (MgO) and silica, based on the mineral raw material serpentine by means of a hydrochloric acid recycle process. Leaching of serpentine with hydrochloric acid results in a MgCl2-brine. The MgCl2-brine is thermally decomposed in a spray roasting process. The reaction leads to MgO powder, hydrochloric acid and water vapour. The hydrochloric acid is recycled for serpentine leaching in a closed, environmentally friendly cycle. The magnesium oxide produced is partly sold and partly used as intermediate in the magnesium hydroxide unit. There, magnesium oxide is converted into magnesium hydroxide (Mg(OH)2) in a hydration process followed by various secondary treatment steps. The silica resulting from the MgO-unit is refined and washed. It is the base material for production of sodium silicate in the water glass unit. Various refining and packaging installations, warehouses, storage tanks, silos and loading and despatch units complete the production facilities. A central process control system, which controls all units ensures efficient production as well as uniform product quality.

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