Do you really understand what lime is? Do you know the effect of quicklime and the main components of quicklime ? Our main task today is to learn about quicklime. Friends who don't understand quicklime should pay attention to it. After you learn about quicklime, you will be able to sigh all kinds of powerful lime. So today we have to understand what lime is. What are the main components of quicklime? What are the effects of quicklime? Whether you are interested or uninterested in this kind of thing like quicklime, it doesn't matter. As long as you understand the various uses of quicklime, I believe that in the future you will rely on quicklime.

What is lime

Calcium oxide is what we usually refer to as quicklime. So how does lime come from? Natural rocks containing calcium carbonate as their main component, such as limestone or dolomite limestone, can be used to produce lime. Lime is the main natural calcium carbonate rock that burns at a suitable temperature and releases carbon dioxide. The resulting carbon oxide is the main quicklime. You don’t look at what limestone is derived from inside the rock. It plays a significant role in our daily life and it is also very important.

The main components of lime

Since quicklime is decomposed by calcining at high temperatures in natural rock, the main component of quicklime after decomposing carbon dioxide is calcium oxide. Of course, calcium oxide also contains other components. Lime contains underfire lime, overfire lime, and underfire lime means that calcium carbonate is not completely decomposed, and overfire lime is a very structural rice plant. After calcining, the surface is covered with a layer of melt, which is slow to ripen. In addition to calcium oxide, the main components of quicklime are magnesium oxide, and can also be classified into calcareous lime and magnesia based on the content of magnesium oxide.

The role of lime

The use of lime as a building material is believed to be relatively clear to everyone, but the effect of quicklime is not limited to this. Lime after absorbing moisture or adding water can become slaked lime, so that it can be formulated into mortar, lime paste and lime mortar as coating materials. In addition to building materials, it can also be used as rubber, plastic, paper, toothpaste As well as filling materials in cosmetics, quicklime can also be used as a desiccant and disinfectant, which is widely used in daily life. In agriculture, quicklime can also be turned into fertilizer. After quicklime is prepared, the structure of the soil can be improved and calcium can be added to the plant.

  

The difference between quicklime and hydrated lime

(1) slaked lime

Lime has the distinction between quicklime and hydrated lime. The main component of quicklime is calcium oxide (CaO), which is hardly soluble in white solids. Limestone with high (CaO) content is calcined in a ventilated lime kiln above 900°C. Is a water absorbent, can be used as a desiccant, China's folk to prevent the return of debris. Reacts with water (gives a lot of heat at the same time), or absorbs moisture in moist air, ie, mature lime [calcium hydroxide Ca(OH)2, also known as "slaked lime". Lime is dissolved in a liter of water 1.56 grams (20 ° C), its saturated solution is called "lime water", is alkaline, in the air to absorb carbon dioxide from calcium carbonate precipitation.

(2) Conversion and hardening of hydrated lime

The process of reacting lime (CaO) with water to produce calcium hydroxide is known as the ripening or digestion of lime. The resulting product, calcium hydroxide, is called hydrated lime or hydrated lime.

When the lime matures, it releases a lot of heat and its volume increases by 1 to 2.0 times. Calcined limestone with high calcia content is ripened quickly, and there is also a large increase in heat release and volume. There are two commonly used methods for curing lime on the construction site: the slaked lime method and the slaked lime method.

In the lime slurry formed by aging lime, the lime particles form a colloidal structure of calcium hydroxide, the particles are very fine (particle size is about 1 μm), the specific surface area is very large (up to 10-30 m2/g), and the surface layer is thicker The water film can absorb a large amount of water and therefore has a strong ability to retain moisture, that is, it has a good water retention property. Blending it into cement mortar and mixing it with mortar can significantly increase the workability of the mortar.

Lime is hardened by dry crystallization and carbonization. As the content of carbon dioxide in the air is low, and the hard shell of calcium carbonate formed after carbonation prevents carbon dioxide from penetrating into the interior, it also prevents water from evaporating outwards. Therefore, the hardening hardens, and the strength after hardening does not High, 1:3 lime mortar 28d compressive strength of only 0.2 ~ 0.5MPa. When in a humid environment, moisture in the lime does not evaporate, carbon dioxide cannot penetrate, and hardening stops. Plus, calcium hydroxide is slightly soluble in water, and hardened lime dissolves and disintegrates in water. Therefore, lime should not be used in long-term wet and water-soaked environments.

In the hardening process of lime, a large amount of water is evaporated, causing a significant shrinkage of the volume and prone to dry shrinkage cracks. Therefore, lime should not be used alone. Generally, sand, paper ribs, hemp cutters and other materials are added to reduce shrinkage, increase tensile strength, and save lime.

Lime has strong alkalinity, can react with glassy active silica or activated alumina at room temperature, produce hydraulic products, and produce cementation. Therefore, lime is also an important raw material in the building materials industry.

  

What are the effects of quicklime to mature lime?

Lime is an important material in our daily life or in industrial use. The role of quicklime is generally small. Most of us need lime to make hydrated lime. This process is actually very simple, that is, adding the right amount of water, but adding lime after adding water. It begins to react with water, and a large amount of heat is released during this process. So whether or not we are operating it, we must pay attention to control the danger. Because hydrated lime is extremely corrosive, it can easily harm our skin. We use it carefully.

When we use quicklime to make hydrated lime, all this will become very simple, and we can use these substances in all aspects, whether it is used for interior decoration or other process improvements, the final result will actually change. It is very simple, which is why many people like to use slaked lime, because the stability is better, and the possible problems are relatively clear, there will be no adverse consequences, so this matter will be very important.

In some places, lime-based slaked lime is also used in agriculture. Because of its strong presence, it can effectively kill some pests. Therefore, we prefer the existence of such substances. This has obvious effects and can also be used. Used in all aspects, especially where there is a need for these. In fact, we are familiar with their characteristics, but in the use of some areas may need to pay attention to, such as the characteristics of easy hardening, need to stir to prevent the use of adhesion.

Editor's summary: The above is the main ingredient of quicklime is what the role of quicklime which is related to the knowledge of the introduction, hoping to help to meet the needs of friends! For more information about you and more, please continue to follow our website. More exciting content will follow.

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