What is lime and what is its use?

Chemically, lime is one of the calcium-containing compounds, in the form of calcium oxide, which is obtained from the purification of calcium carbonate and is used as mortar and mortar.

What are the types of lime?

There are different methods for classifying limes based on shape, granulation, reactivity, etc. To familiarize yourself with the different types of lime, categories are provided below.

Types of market lime are divided into 3 categories:

Fatty or strong lime: It is the purest type of lime available in nature, whose formula is the closest to calcium oxide. This type of lime has only four percent impurities and as a result, when combined with water, it reacts strongly and swells so that its volume increases up to 150%.

Weak lime: As its name suggests, it has a weak mortar and the reason is that its limestone contains only about 4 to 6 percent calcium oxide. It has different impurities such as ocher soil and due to iron, silica and alum compounds.

Blue lime: This type of lime is known as clay lime because there is about 6-22% clay in its composition. It is the only type of lime that hardens even under water and produces a lot of efflorescence. This material is basically something between lime and cement.

Another type of lime classification is based on its chemical formula, which are:

Quick lime: It is the pure type of lime found in nature and has the structural formula of calcium oxide and is produced by purifying calcium carbonate rock using very high heat. The characteristic of quicklime is that it blooms due to contact with water.

Hydrated lime: It is a powdery and non-reactive type of lime and has the molecular formula of calcium hydroxide. Hydrated lime or dead lime has no affinity with water and has various uses.

What is dead lime and lime water?

If we pour water on quicklime, a lot of heat is released during a chemical reaction. In this case, the lime swells by absorbing the hydroxide ion and becomes a white and ineffective powder, which is called hydrated lime or dead lime, which is called blooming of lime.

If you continue this process and add water to calcium hydroxide, a milky substance called lime juice or lime juice will be created. If it is smoothed, it has a variety of applications such as jam and food production, ammonia, caustic soda, perchlorine, etc.

What are the methods of producing lime?

Due to the fact that lime is a combination of calcium and natural, the main method of its production is by heating calcium carbonate rock at a temperature of 1000 to 2500 degrees Celsius. With this method, various impurities in it such as calcium dioxide gas are removed.

The general method of preparing lime is heating limestone (calcium carbonate) to a temperature of 1000 to 1200 degrees Celsius. Of course, the higher the temperature and the better the resulting carbon dioxide gas is removed from the environment, the better the decomposition of limestone takes place. To prepare lime, fixed or continuous furnaces or mechanical furnaces are used.

Fixed and non-continuous kilns: It is the traditional type of lime kilns in which limestone lumps of various sizes are placed and then the outlet is closed with mud straw. The fuel of these furnaces is generally black oil or coal, and it applies a temperature of approximately 1000 degrees Celsius to the limestone for a long time.

Mechanical and continuous kilns: The industrial method of producing lime, which is also known as industrial lime, is using this type of kiln. This type of furnace, which is also known as rotary furnace, provides the necessary heat by using electricity or coal. The heating time in industrial ovens is less than traditional ovens.

Blooming (hydrating): Quick lime is ready after baking, and it is possible to proceed to produce hydrated lime at this stage. There are two ways to do this. The first method, which is done by most of the producers, and of course it causes the production of low-quality hydrated lime, is the combination of quicklime with water. Another scientific method is to use the hydration system.

sale of lime

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