Uses of Calcium Oxide CaO products in various industries
Water detection paste contains a mixture of Calcium Oxide CaO products and phenolphthalein.
Petroleum industry: Water detection paste contains a mixture of Calcium Oxide CaO products and phenolphthalein. If this paste comes into contact with water in a fuel storage tank, the CaO reacts with the water to form hydrogen Calcium Oxide CaO products. Hydrogen Calcium Oxide CaO products have a pH high enough to give phenolphthalein a bright purple color, thereby indicating the presence of water.
Calcium Oxide CaO products are used to regenerate sodium hydroxide from sodium carbonate in chemical recycling at pulp mills.
Gypsum: There is archaeological evidence that limestone-based gypsum was used by pre-Pottery Neolithic B humans for flooring and other purposes until the end of the nineteenth century.
Chemical or Power Production: Solid sprays or slurries of Calcium Oxide CaO products can be used to remove sulfur dioxide from exhaust streams in a process known as flue gas desulfurization.
Mining: Compressed lime cylinders use the exothermic properties of quicklime to break rock. A blasthole is drilled in the rock in the usual manner, and a sealing cylinder of quicklime is placed and compacted. A quantity of water is then injected into the barrel, and the resulting release of steam along with a larger amount of residual hydrated solids separates the rock. This method will not work if the rock is not very hard.