Hydrated Lime

Application of calcium hydroxide is as a flocculant, in water and sewage treatment. It forms a fluffy charged solid that aids in the removal of smaller particles from water, resulting in a clearer product. This application is enabled by the low cost and low toxicity of calcium hydroxide. It is also used in fresh water treatment for raising the pH of the water so that pipes will not corrode where the base water is acidic, because it is self-regulating and does not raise the pH too much.

· Used in the preparation of ammonia gas (NH3)

· large application is in the paper industry, where it is an intermediate in the reaction in the production of sodium hydroxide. This conversion is part of the causticizing step in the Kraft process for making pulp.

· In the causticizing operation, burned lime is added to green liquor, which is a solution primarily of sodium carbonate and sodium sulfate produced by dissolving smelt, which is the molten form of these chemicals from the recovery furnace.

Food industry

Because of its low toxicity and the mildness of its basic properties, slaked lime is widely used in the food industry

· To clarify raw juice from sugarcane or sugar beets in the sugar industry, (see carbonatation)

· To process water for alcoholic beverages and soft drinks

· Pickle cucumbers and other foods

· To make Chinese century eggs

· In maize preparation: removes the cellulose hull of maize kernels (see nixtamalization)

·As a substitute for baking soda in making papadam

·In the removal of carbon dioxide from controlled atmosphere produce storage rooms