What is quicklime used for? What are the functions of quicklime

1. It can be used as a desiccant, 2. It can be used as a building material, 3. It can improve the soil.

Quicklime can be used as a desiccant and has a good dehumidification effect. Because it reacts with moisture in the air, it reduces the humidity in the room and keeps the room dry. Especially when the air is humid, sprinkle quicklime on the corners of the wall, which can play a good moisture-proof effect.

Quicklime can also be used in construction projects, for example when plastering walls, where it is mixed with cement mortar and then used to coat walls. Quicklime can also be used to improve the soil, and for acidified soil, you can bury some quicklime in it appropriately, so that you can change its pH value. At the same time, quicklime will also produce a certain amount of heat after being in the soil, which can effectively eliminate pests in the soil.

1. Preparation

Raw materials: All natural rocks with calcium carbonate as the main component, such as limestone, chalk, dolomitic limestone, etc., can be used to produce lime. In actual production, in order to speed up the decomposition, the calcination temperature is often increased to 1000 1100.

Due to the large size of the limestone raw material or the uneven temperature distribution in the kiln during calcination, lime often contains under-fired lime and over-fired lime. The calcium carbonate in the o-flint lime is not completely decomposed, and it lacks cohesion when used. The structure of the flint lime is dense, and the surface is often covered with a layer of molten matter, which melts very slowly.

Because the production raw materials often contain magnesium carbonate (MGO3), quicklime also contains the minor component magnesium oxide (MGO), which is divided into calcareous lime (MGO 5%) and magnesia lime (MGO>5%) according to the magnesium oxide content.

Second, the role

Quicklime is a commonly used desiccant to remove water vapor by chemical absorption, and is also used for steel, pesticides, medicines, desiccant, tanning and alcohol dehydration. It is especially suitable for puffed food, shiitake mushrooms, fungus and other local products, as well as products in instrumentation, medicine, clothing, electronic telecommunications, leather, textile and other industries. Lime and limestone are used in large quantities as building materials and are also important raw materials for many industries.

Limestone can be processed directly into stone and fired into quicklime.

Lime has quicklime and hydrated lime. The main component of quicklime is CAO, which is generally lumpy, pure white, and light gray or light yellow when containing impurities. Quicklime absorbs moisture or adds water to become slaked lime, which is also called slaked lime, and its main component is Ca(OH)2.

Hydrated lime is blended into lime slurry, lime paste, lime mortar, etc., which is used as coating materials and brick and tile adhesives.

The above is the role of quicklime. Quicklimestone is generally used to make some building materials, it is a material with good stability, which can be used as a raw material for lime paste and lime mortar. Limestone can be made into desiccant, and many desiccants in our lives are made from limestone.

Limestone with water will heat up, everyone should be extra careful, do not easily put limestone in water, because it is easy to cause burns, children should pay special attention.

The uses of quicklime and hydrated lime are as follows:

1. Quicklime is a very common building material and industrial raw material, it can also be used in the production of pharmaceutical, leather, textile, clothing and other industry products.

2. Hydrated lime is also known as calcium hydroxide, which is also processed from quicklime. Hydrated lime can regulate the acidity and alkalinity of the soil, and can also be used to apply to trees to help trees survive the winter and prevent insects.

3. At the same time, hydrated lime can be used to make bleaching powder, disinfectant, hard water softener, neutralizing agent, curing agent and other substances, and it can also be used to make epichlorohydrin and propylene oxide. In addition to this, it can also be used in the sugar industry to reduce the sour taste of sugar.

Others

The specific application of calcium hydroxide in flue gas desulfurization: it is mainly used to neutralize sulfur dioxide, sulfur trioxide and a small part of fluoride ions, chloride ions and other acid gases, so that the sulfur content of the emitted flue gas meets environmental protection standards.

Application of calcium hydroxide in sugar production process: In the sugar production process, calcium hydroxide should be used to neutralize the acid in the syrup, and then carbon dioxide should be introduced to precipitate and discharge the remaining calcium hydroxide, so as to reduce the sour taste of sugar.

Application of calcium hydroxide in leather manufacturing industry: mainly used in the carding process in the leather manufacturing industry. Uses of calcium hydroxide in food: Due to the strong activity and loose structure of calcium hydroxide, it is widely used in food additives.