Does quicklime act prevent oxidative deterioration or drying 40

Quicklime has the effect of water absorption, and it has the effect of chemical reaction with water to produce part of the ozone, prevent oxidation, deterioration, and drying.

Quicklime has a water-absorbing effect and is therefore used for drying, and it generally does not exhibit reducibility.

The provinces include Inner Mongolia Autonomous Region, Shanxi, Shaanxi, Xinjiang, Yunnan, Heilongjiang, Liaoning, and Ningxia. Gansu. Mainly in these places.

The open-pit coal mines of more than one million tons in Inner Mongolia are mainly in Ordos (Wujiata, Heidaigou, Harwusu), Xilin Gol League (Datang Xilinhot, Shenhua Shengli Energy, Pingzhuang Coal Group Baiyinhua Mining Area), Tongliao City (China Power Investment Huolinhe Open-pit Coal Mine), Hulunbuir City (Datang), Shanxi Shuozhou City, there are Antaibao Open-pit Coal Mine, Anjialing Open-pit Coal Mine and the newly built East Open-pit Coal Mine of Pingshuo Company of China Coal Group. Heilongjiang has the Baoqing Chaoyang open-pit coal mine in Shuangyashan, which is the first open-pit coal mine in Heilongjiang of the State Grid Corporation of China Luneng, and then there will be more open-pit coal mines in Heilongjiang. There are some in Yulin, Shaanxi.

The main ones in Yunnan are Xiaolongtan Mining Bureau and Pioneer Open-pit Coal Mine. Xinjiang is dominated by open-pit coal mines, including (Changji) Zhundong Mining Area, (Turpan Hami) Tuha Mining Area, etc., and now there are Shenhua Group, Shendong Tianlong Group, Lu'an Group, Huadian Group, China Power Investment Group, Huaneng Group, Gezhouba Group and other large enterprises stationed there.

Dry gas, can not absorb oxygen.

cao+h2o=ca(oh)2

Quicklime is used for drying.

InQuicklimeAdd an appropriate amount of water, and the product formed after the reaction isHydrated lime

1. Ash spraying method.

As the name suggests, the lime is drenched with water, which causes it to undergo a chemical reaction and become hydrated lime. When spraying ash, pay attention to the position and take protective measures. In the process of maturation, because it is drenched with water, the heat release is uneven, and splashing may occur, so in this process, it is necessary to try to control the water pressure to avoid excessive water pressure, so that it is evenly poured on the quicklime to complete the transformation.

This method is called lime paste formed by adding too much water.

Second, the ash method.

The law of ashing is to use the water absorption characteristics of quicklime and let it absorb water naturally, but this process is relatively slow, and the powdered hydrated lime formed is also called dry ash.

The main component of quicklime is calcium oxide, which reacts with water to form calcium hydroxide.

i.e. hydrated lime. The process of reacting quicklime with water to produce calcium hydroxide is called the curing or digestion of lime, which reacts with water while releasing more heat, or absorbing moisture from moist air, that is, mature lime.

Quicklime is usually made by using calcium carbonate as the main component.

of natural rocks, calcined at high temperatures, decompose to produce carbon dioxide.

and calcium oxide. Cooked lime is often used on the construction site.

Slurry method and slaked lime powder method.

Hydrated lime generally refers to calcium hydroxide, which is a white powdery solid, which is divided into two layers after adding water, and the upper layer of aqueous solution is called clarified lime water.

The lower suspension is called lime milk or lime slurry.

Quicklime can also undergo chemical reactions with acidic gases such as carbon dioxide, sulfur dioxide, and sulfur trioxide, and the chemical reaction equation is as follows:

1. Quicklime reaction with carbon dioxide

Quicklime reacts with carbon dioxide.

2. Reaction between quicklime and sulfur dioxide:

Quicklime reacts with sulfur dioxide.

3. Quicklime reacts with sulfur trioxide

Quicklime reacts with sulfur trioxide.

A: Quicklime is CaO, and hydrated lime is Ca(OH)2, both of which do not contain sulfur, so there is no question of how much sulfur there is. Quicklime reacts with water to produce mature lime, and releases a large amount of heat, and the chemical reaction formula is as follows:

cao ten h2o ca(oh)2

The molecular weight of CaO is 56 and the molecular weight of Ca(OH)2 is 74, so the quicklime becomes mature lime and the mass of lime becomes larger. (Look).

According to the chemical equation cao+h2o=ca(oh)2. From this it is known that the hydrated lime mass has increased.

Quicklime is an oxide.

Quicklime is the common name for calcium oxide, which is an alkaline oxide that can be hydrated to form calcium hydroxide, and can also react with acid to form calcium salt and water. Quicklime, the main component of the first rot is calcium oxide, which is usually prepared by natural rock with the main component of calcium carbonate, which can be decomposed to generate carbon dioxide and calcium oxide by calcination at high temperature.

Quicklime is white or gray in the form of blocks, and for ease of use, block quicklime often needs to be processed into quicklime powder, slaked lime powder or lime paste. Quicklime powder is a fine powder obtained by grinding bulk quicklime, and its main component is CAO; Slaked lime powder is a powder obtained by curing lumpy quicklime with an appropriate amount of water, also known as hydrated lime, and its main component is Ca(OH)2; Lime paste is a paste obtained by curing lumpy quicklime with more water (about 3-4 times the volume of quicklime), also known as lime paste.

Maturation and hardening of quicklime

In the lime slurry formed after quicklime maturation, the lime particles form a calcium hydroxide colloidal structure, the particles are very fine (particle size is about 1 m), the specific surface area is very large (up to 10-30m2 g), and the surface adsorbs a thick water film, which can adsorb a large amount of water, so it has a strong ability to retain water, that is, good water retention. It is mixed into cement mortar to form a mixed mortar, which can significantly improve the workability of the mortar.

In the process of hardening, a large amount of water should evaporate, causing significant volume shrinkage, and it is easy to appear dry shrinkage cracks in the celery mold. Therefore, lime should not be used alone, and generally should be mixed with materials such as human sand, paper tendons, hemp knives, etc., to reduce shrinkage, increase tensile strength, and save lime.

The main component of quicklime is calcium oxide (CAO), and the white solid pin is intolerable to fire. Limestone with a high (cao) content is calcined to more than 900 degrees in a ventilated lime kiln. It is water absorbent and can be used as a desiccant, which is commonly used by Chinese folk to prevent the resurgence of miscellaneous things.

First, the structure

The main ingredient is calcium oxide (CAO).

Hydrated lime, slaked lime: calcium hydroxide Ca(OH)2

The main component of limestone is calcium carbonate CaCO3, while the main component of quicklime is Cao.

Quicklime reacts with water to form calcium hydroxide Ca(OH)2, which is commonly referred to as hydrated lime.

Equation: cao+h2o=ca(oh)2

2. Preparation of raw materials

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

3. Use

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.

Question 1: Is quicklime an oxide and diamond an elemental substance? The rust composition is not only Fe2O3, but Fe2O3 XH20, so it cannot be said that it is an oxide.

Question 2: Are water, sulfur dioxide, and calcium oxide all oxides a. There are two elements in carbon monoxide, magnesium oxide, and manganese dioxide and contain oxygen elements, which belong to the state of oxides. b. There are two elements in water and sulfur dioxide and contain oxygen elements, which belong to oxides, and jujube caution is composed of three elements in potassium permanganate, which is not an oxide, so b is incorrect; c. In ferrous oxide, copper oxide, mercury oxide two elements and contain oxygen elements, belong to oxides, so C is correct; D. There are two elements in calcium oxide and ferric tetroxide and contain oxygen elements, which belong to oxides, and there is an element composition in oxygen, which belongs to elemental substances and does not belong to oxides

Question 3: Is quicklime an electrolyte Explain it in detail? cao is not an electrolyte because he is not a conductor and is an oxide.

Question 4: Is quicklime oxide and diamond elemental? The rust composition is not only Fe2O3, but Fe2O3 XH20, so it cannot be said that it is an oxide.

Question 5: Is quicklime an electrolyte Explain in detail? cao is not an electrolyte because he is not a conductor and is an oxide.

Question 6: Is calcium oxide an electrolyte Why is calcium oxide an electrolyte. Metal oxides are strong electrolytes that can be completely ionized in the molten state.

To judge the electrolyte, we must first determine whether the substance is a compound, and then judge it: 1 whether it is ionized in water, 2 whether it is ionized in the molten state, as long as one of the two conditions of 1 2 is satisfied, it can be called an electrolyte, if it is not completely ionized, it is a weak electrolyte, and completely ionized is a strong electrolyte. Common strong electrolytes are strong bases, metal oxides, all salts, strong acids, and so on.