Hydrated lime is produced by adding water to quicklime in a process called hydration or slaking, where the calcium oxide and water combine chemically to form. The process of adding water to calcium oxide to produce calcium hydroxide is referred to as hydration process or lime slaking. The lime slurry flows by gravity from the first chamber to the grit chamber. An overview of lime slaking and factors that affect.
The method of slaking lime using baskets can be mostly found in manuscripts from the 19 th century and describes mainly an easy procedure for producing calcium hydroxide powder 1. Typically a slurry slaker, sometimes called a detention type slaker, is comprised of two chambers. Understanding the precipitated calcium carbonate pcc. The normal mill rubber line will deteriorate at this temperature. The second chamber is usually used as a grit removal chamber. The first chamber is called the slaking chamber where lime and water are mixed. In this study, the influence of slaking water properties to lime quality has been investigated. This led to a decision to include an assessment of different water. The mill temperature for slaking dolomatic pebble lime should be about 200f. Pdf the influence of storage and production on the reactivity, i. Comparing lime slaking, traditional low density lime, and high density lime. It was found that soft burnt lime during slaking process dramatically increases its surface area and. An overview of lime slaking and factors that affect the. Detention type slakers are typically made with a maximum feed rate of 20 tons per hour.
In the slaking process, lumps of quicklime disintegrated to produce creamy white smooth paste of hydrated lime caoh 2 suspension, and is subsequently diluted in excess distilled water to produce different milk of lime molarities. Another method of combining the forced and induced draft is according to the. Pdf chloride, carbonate and sulphate ions are common constituents of. Paste slakers are compact in size and are designed for a retention time of 5 minutes in the slaking chamber. Commercial lime slakers in industry normally operate by using 3 to 4 parts of water for 1 part of unslaked lime. During slaking the quicklime lumps will disintegrate to a fine powder. If you add water to quick lime what you get is slaked lime and the process is called slaking. In the lime slaking tank quicklime is mixed with water and a lime milk suspension is created by an exothermal reaction. How to build a hinged hoophouse for a raised bed garden duration.
The standard reactivity test as a measure of limes quality. Hence quality of water plays an important role in slaking. Although the slaking of lime is a reaction of great antiquity, there have been few fundamental studies of its. Pdf an empirical study of factors influencing lime slaking part ii. The concentration is 20 to 25% by weight depending on the lime product used. A facility is a site of land with a plant and equipment that combine inputs. Dry chemical feed systems series a758 lime slaking system. In a killan furnace limestone s are transformed into quick lime cao, which is kind of white in color and soft than stone. Effect of slaking water properties to lime quality. With this high temperature, special mill lining must be used.