The process of slaking calcium oxide with water produces Hydrated Lime Powder, which is a dry, white crystalline powder. Mortars, cements, plasters, hard rubber goods, paints, leather tanning and petrochemicals are all made using hydrated lime. The use of hydrated lime in environmental applications is a relatively recent development. In coal-fired energy facilities, glassmakers, cement mills and incinerators, etc., are employed to remove acid gases. However, the most common application of hydrated lime is in the steel industry, where it is used to eliminate impurities.