How Can Calcium Hydroxide be Made from Limestone

Limestone is a sedimentary rock abundant on earth, which is mainly composed of calcium carbonate (CaCO₃) and many other minerals. Calcium hydroxide is also called hydrated lime, lime hydrate or slaked lime, whose chemical formula is Ca(OH)₂and it is the product of  reaction between quicklime and water. Then how can limestone turn into calcium hydroxide? In fact, it is partly of the limestone cycle. When calcium carbonate (CaCO₃) is heated, it can produce quicklime(CaO) and carbonate dioxide (CO₂). And the carbonate dioxide is driven off by air flow in lime kiln. Then when the quicklime is added with appropriate amount of water, the process can produce calcium hydroxide and heat. So this is how calcium hydroxide is made from limestone.

ultrafine calcium carbonate plant

Limestone Processing Plant

Limestone is abundant sedimentary rock consisting of high level of calcium carbonate. Limestone is a very useful industrial mineral that it is used widely in many industries, such as construction, paint, paper industries. Limestone is normally used in three forms ...
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lime calcination plant

Lime Calcination Plant

Lime calcination plant is also known as quicklime plant, lime processing plant, lime production plant or quicklime production plant. Lime calcination plant is a complete quicklime production line to produce quicklime(also known as burnt lime)by calcination of limestone which contains ...
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hydrated lime plant

Hydrated Lime Plant

Hydrated lime plant is also called lime hydration plant, hydrated lime production line or quicklime hydration plant. Hydrated lime is also known as slaked lime, and its chemical name is called calcium hydroxide. It is the product of quicklime reaction ...
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lime kiln manufacturer

Lime Kiln Manufacturer

Lime kiln is also known as quicklime kiln or limestone kiln. And according to shapes and operation principles, there are rotary lime kilns and vertical lime kilns. Quicklime kiln is the core equipment of quicklime plant to burn limestone to ...
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Processing of Limestone

Quarrying

The process of producing calcium hydroxide starts with extracting limestone from quarries.

Sizing

To obtained desired sizes of feed limestone, the extracted limestone will go through primary, secondary and even tertiary crushers. Then the reduced sizes of limestone is screened and washed to ensure the high quality of final product.

Lime calcining

Currently, limestone is calcined in lime kilns. And there are two kinds of lime kilns, one is rotary lime kiln and vertical lime kiln. With development of technology and consciousness of environment, modern lime kilns are built to save energy and perform with high efficiency. In general, the limestone in lime kiln will go through three stages: preheating, calcining and cooling. In the preheating stage, the feed limestone is pre-calcined using the heat air from kiln so that it can thoroughly burnt down. While in the calcining stage, the fuel is introduced into the lime kiln to calcine the preheated limestone. Finally, the quicklime is cooled by contact with cooling air, so that the final product can be handled by conveyors and so on.

For the modern rotary lime kiln, it is equipped with separate vertical preheater and vertical cooler. As a result, there is no need for long rotary lime kiln. And it also can improve heating efficiency for it uses the exhaust gases from kiln to preheat the limestone. In turn, this can save energy. As for vertical lime kiln, it contains three chambers to go through the three stages respectively.

Hydration

Firstly, quicklime is crushed for processing hydrated lime. Then adding water to the crushed quicklime to make the chemical reaction happen. Of course, the proportion of quicklime and water is carefully calculated. And then the obtained hydrated lime is classified to meet customers’ specific needs.

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