Why can hydrated lime be sterilized? 5

The surface is not hot, but he can reach a high temperature of 70 degrees after encountering water

Hydrated lime can be disinfected and sterilized. Hydrated lime is a white powdery solid, alkaline, with very strong hygroscopicity, can kill a variety of pathogenic bacteria, generally used for disinfection of walls, floors, septic tanks and sewage ditches.

Hydrated lime is a white powdery powder solid at room temperature, after adding water, it is two layers, the upper layer of clear aqueous solution is commonly known as clear lime water, and the lower layer is called lime milk composed of suspension.

If hydrated lime is exposed to the air for too long, it will chemically react with carbon dioxide in the air to form calcium carbonate.

Hydrated lime can be used to prepare bleaching powder, disinfectant, antacid, astringent, hard water softener, soil acid prevention agent, depilatory, buffer, neutralizing agent, curing agent, etc.

Quicklime, also known as calcium oxide, is a white lump or powder, which produces heat and forms calcium hydroxide after adding water, which is strongly alkaline. This product can kill a variety of pathogenic bacteria, but it is ineffective for spores, and 20% lime milk solution is commonly used for disinfection of the environment, enclosures, floors, bedding, feces and sewage ditches. Quicklime should be dried and stored to avoid deliquescent failure; Lime milk should be used and prepared immediately, and it is best to use it up on the same day.

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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. Soda ash is prepared from limestone, salt, ammonia and other raw materials through a multi-step reaction (Solvay method).

Caustic soda is made by the reaction of slaked lime and soda ash (causticizing method).

Reason: Disinfection and sterilization of lime, with the help of the alkaline effect of lime aqueous solution. Therefore, it has no disinfection and sterilization effect in the dry state.

Only when quicklime comes into contact with very wet objects, such as mold hyphae or aqueous solutions on the culture material and its feed, can it show alkalinity and thus have a disinfecting effect. Because any microbial growth and development requires a certain pH. When the pH in the environment is as high as 12 or more, common molds and bacteria will die.

This is the reason why lime can inhibit the growth of miscellaneous bacteria. After lime absorbs moisture or dissolves in water, it becomes an alkaline substance, calcium hydroxide, which easily absorbs carbon dioxide in the air to form calcium carbonate and become a neutral substance.

The main component of white ash is calcium oxide, which forms calcium hydroxide with water, and calcium hydroxide has the effect of disinfection and sterilization. Sprinkle white ash, generally in humid places such as toilets, white ash absorbs water, not only plays a role in drying, but also has the role of sterilization and disinfection.

Therefore, white lime and lime can play a role in sterilization and disinfection.

Question 1: How to disinfect quicklime.

Quicklime can only be used to disinfect water, fecal excrement, soil, etc., and is hardly used in other places. Because the main component of quicklime is calcium oxide, disinfection relies on calcium oxide dissolved in water to generate calcium hydroxide and release a large amount of heat. Calcium hydroxide is a strong base that raises the pH of the disinfectant and destroys the growth environment for bacteria.

At the same time, a large amount of exothermic will cause local high temperature, which has a sterilization effect.

If you want to use it, first take protective measures, wear a mask, rubber gloves, and then slowly sprinkle quicklime into the water according to the proportion, stirring gently.

Question 2: How to use lime for disinfection.

However, there are many breeding professional households using improper methods, resulting in poor disinfection effect, and their mistakes must be thoroughly corrected in order to achieve the purpose of disinfection. 1. Disinfectant lime should be bought and used in order to save trouble, professional households buy a lot of quicklime at one time, which cannot be used up at one time, and will continue to be used for disinfection in the future. This is incorrect, because the chemical name of quicklime is calcium oxide, after adding water, it will generate loose hydrated lime, if the quicklime is placed in a sealed container, it will also absorb moisture in the air and become mature lime, that is, calcium hydroxide, only the dissociated hydroxide ions have a bactericidal effect.

If hydrated lime is left for a long time, it will react chemically with carbon dioxide in the air to produce calcium carbonate without hydroxide ions, which has completely lost the effect of sterilization and disinfection. Second, at the entrance of the stable set up a disinfection room, disinfection pool, the pool into the fresh quicklime Some professional households do not set up a disinfection room at the entrance, but sprinkle a layer of lime, so that the personnel in and out trample through. If it is fresh lime, it will have a certain disinfection effect.

If the lime is not changed frequently, and clothes and tools are not disinfected, germs and viruses can still be brought into the stable. The correct way is to set up a disinfection room and a disinfection pool at the entrance of the stable, install ultraviolet lamps in the room, put quicklime in the pool, and replace it frequently.

Yes, suitable for wet farm ground disinfection, quicklime will produce high temperature when it meets water, which can kill bacteria, viruses, and parasite eggs, how much quicklime is sprinkled according to their own control, it will produce a strong alkaline corrosive smell, wait for quicklime to oxidize for a few hours and then rinse it clean, and then dry it in the sun.

Quicklime can only be used to disinfect water bodies, fecal excrement, soil .........

When the lime is disinfected, you can add some nutrients inside, and it also needs to be evenly sprinkled on the roots, and it should be sprinkled less when spraying each time, but you must pay attention to using it 3 or 5 times a week.

You can dilute it with lime and water, and then pour it around the place to be disinfected, and you're good to go.

First of all, we should choose some lime disinfection with good effect, and we should also pay attention to the proportion of blending, and also pay attention to the method of use.

We can directly sprinkle lime on the place that needs to be disinfected, so that it can play a role in disinfection, in fact, it is also very simple.

The quicklime can be disinfected by dissolving it in water, and the quicklime will have a chemical reaction as long as it encounters water, and then a large amount of heat and calcium hydroxide will be produced. When the protein encounters a strong base, it will be denatured, and the protein will lose its biological activity, thus playing the role of disinfection and sterilization.

Limestone is burned at high temperature, and calcium oxide is formed after losing carbon dioxide, which is crushed to become lime powder that can be used for sterilization and disinfection. Lumpy calcium oxide and its crushed powdered calcium oxide are collectively referred to as quicklime, referred to as lime. The disinfection and sterilization effect of lime is with the help of the alkaline effect of lime aqueous solution.

Because calcium hydroxide is strongly alkaline, it is difficult for most germs to survive, so quicklime has a good disinfection effect. Quicklime is also often used in planting, breeding and environmental disinfection because it is cheap, easy to buy and safe to use. Dried quicklime does not have the effect of sterilization and disinfection, only the alkaline calcium hydroxide formed after exothermic reaction with water has a disinfection effect.

The alkaline environment denatures proteins, making them inbiologically inactive, thus eliminating germs and pests.

Notes:1Quicklime should be bought and used now, and if it is exposed to the air for a long time, it will absorb carbon dioxide and gradually turn it into powdered calcium carbonate, which will not have the desired sterilization effect.

2.If the dust of quicklime enters the respiratory tract, it will be converted into strong alkaline calcium hydroxide, which will corrode the mucous membrane of the respiratory tract and endanger human health. Therefore, quicklime is generally added with a small amount of water to make it into strong alkaline, hydrated lime with sterilization and disinfection effect before use.

3.The amount of quicklime used should be well controlled: too much quicklime will lead to too much alkalinity, and the effect will be counterproductive.

When used in the soil, it will cause the soil to be too alkaline, so that some elements that are easy to be absorbed and utilized under neutral and acidic conditions are fixed, which affects the absorption of these nutrients by vegetable roots, and then leads to poor growth of vegetables.

4.Quicklime should not be mixed with fermented and rotted manure, which will not only reduce the use effect of fertilizer, but also weaken the sterilization effect of lime.

Is it OK to disinfect the reservoir and throw it whole into the water?

Quicklime disinfection needs to be mixed with water, mature lime water to have a disinfection effect. You can also sprinkle water on the ground and then sprinkle lime.

1. The direct use of quicklime has no sterilization and disinfection effect, and it is necessary to react the quicklime water with water for a period of time to produce mature lime water, which will have a certain sterilization effect.

2. You can also spray a certain amount of water on the ground, and then sprinkle lime powder on the water, which not only has a good sterilization effect, but also will not form a large amount of dust in the pig house.

Lime disinfection method:

1. Generally, after the pigs in the pigsty are slaughtered, the ground and wall are rinsed, and then the purchased quicklime is mixed with water to make 20% lime milk, and painted on the wall and ground of the pigsty, especially the gaps and corners, must be carefully painted, do not leave dead corners.

2. Some farmers directly sprinkle hydrated lime on the ground in the pigsty, which can easily lead to pig burns and cross-paw burns, and if the pigs eat the food on the ground, it will lead to burns to the mouth and digestive tract. Secondly, when spreading, lime dust will cause lime dust to fly everywhere, which is easy to be inhaled into the respiratory tract by pigs, which will cause symptoms such as coughing and sneezing.

3. In general, the wall of the Orchid House of the farm, use 1 liter of 10% lime milk brush about 3 times per square meter, and use fresh hydrated lime powder to sprinkle on the ground, sewage ditch, damp road and manure tank in the foraging and habitat of the farm. Because the cement floor is too dry, the effect of lime powder is not good.

Usually 10-20 parts of lime, add water to 100 parts, stir well, make lime milk to coat the walls of the sheep house, etc.

Soak straw bales or sacks with 20% lime milk and place them at the door of the sheep house, so that the people entering and leaving can step on them and disinfect the soles of their shoes. This prevents illness caused by germs carried by people entering and leaving the country.

Users need to pay attention to the fact that direct disinfection cannot be carried out with quicklime dry powder. Because the dry powder has no sterilization effect, calcium hydroxide is generated after lime is added to water to have a sterilizing effect and achieve the purpose of disinfection. Lime milk must be used and prepared.

Because after preparation, after a long time, it absorbs carbon dioxide in the air, and the calcium hydroxide in lime milk becomes calcium carbonate and loses its sterilization and disinfection function. Therefore, it must be used and matched.

The first misunderstanding is: in order to save trouble, some professional households buy a lot of quicklime at a time, which cannot be used up at one time, and will continue to be used for disinfection in the future.

The chemical name of quicklime is calcium oxide, and after adding water, it will form loose hydrated lime, also known as calcium hydroxide, and only this dissociated hydroxide ion has a bactericidal effect. If hydrated lime is left for a long time, it will react with carbon dioxide in the air to produce calcium carbonate without hydroxide ions, so that the effect of sterilization and disinfection is completely lost. Therefore, when using lime as disinfectant, it should be bought and used now, and the rest can no longer be used as disinfectant in the future.

In fact, if it is sprinkled with a layer of fresh hydrated lime, it will have a certain disinfection effect after the people entering and exiting the city step on it. However, there are many pig farmers who do not often change fresh hydrated lime, and their clothes and tools are not disinfected, which will still bring germs and viruses into the stable. The correct approach should be to set up a disinfection room and disinfection pool at the entrance of the stable, and put disinfectants in the pool and change them frequently.

People entering and leaving the country should change their shoes, change their clothes, wash their hands, and disinfect the tools they use frequently.

The third misunderstanding is that some professional households sprinkle hydrated lime powder directly on the ground in the stable.

Sprinkle a layer of hydrated lime powder on the ground of the pig stable, it is easy to burn the pig's claws, and the pig is easy to burn the mouth and digestive tract after eating the food that falls on the ground. In addition, when lime powder is sprinkled, it will cause a large amount of lime dust to fly, so that pigs can inhale into the respiratory tract and cause coughing. Symptoms such as sneezing.

The correct way to do this is to wait until the pigs in the barn are out of the barn, and then clean the walls and floors. Method:

Use the newly bought quicklime and water to prepare 20% lime milk, and paint the walls or floors of the pig house, especially the corners and gaps of the wall, be sure to paint them, leaving no dead ends. This not only disinfects and sterilizes, but also covers contaminated walls, and also achieves an aesthetic effect.