Calcium hydroxide powder selection is to make the extracted calcium hydroxide mesh more pure. There are many kinds of powder separators, such as centrifugal, three-separation, fly ash and other different types. Qualified powder is selected.

In the process of calcium hydroxide production, even if it is produced by professional calcium hydroxide production line equipment, it is almost inevitable to mix impurities. In order to improve the quality and purity of calcium hydroxide powder, it is necessary to select qualified powders. For this qualification, in addition to requiring purity, the fineness of the powder should also be distinguished.

Small calcium hydroxide powder also has many parameters. It is based on these parameters that people keep thinking about the method of powder selection and design a powder separator. For example, according to the quality and density of the powder, under a certain wind speed, the powder can be divided into two piles with a cyclone separator. Obviously, the pile is needed, and the pile is the so-called impurity.

For the powder separator, the simpler the structure, the better, and the overly complicated powder selection channel is not conducive to the discharge of the selected powder from the powder selection device.

Due to the centrifugal force of the calcium hydroxide powder separator during the powder selection process, it is inevitable that dust will occur. When it comes to dust removal, the first thing that comes to mind is the pulse bag filter.

Pulse dust removal adopts pulse bag type dust removal technology, which overcomes the shortcomings of conventional pulse dust collectors and sub-chamber back-flushing dust collectors. The land area is small, the operation is stable and reliable, and the economy is good. And the falling powder can be recycled and reused, which is a link to reduce the cost of producing calcium hydroxide powder, which overcomes the problem of re-pollution of water dust removal. Any conveying device falls directly into the digester and enters the powder selection system.

Moreover, the clean hot air after dust removal enters the vertical heat conversion device to heat and digest water. In this way, the equipment is protected, the later maintenance is simple, and the impact of dust emission pollution on the surrounding environment can be greatly improved in terms of environmental protection, and the working environment of workers is also greatly improved.

In addition to pulse bag dust removal, there is also a water dust removal method. The water precipitator is a device that makes the dust-containing gas in close contact with water, and uses the inertial collision of water droplets and particles and other effects to capture or increase the particles. The manufacturing cost of the water precipitator is relatively low. However, it is an ideal dust removal method for dust with moisture, stickiness and irritating odor generated in the chemical industry, painting, glaze, pigment and other industries.

In comparison, water dust removal is an ideal dust removal method in the calcium hydroxide powder selection process. How to deal with calcium hydroxide after dust removal?

1. Powdered products are used in bleaching, hydrometallurgy, sewage treatment, sugar refining, papermaking, paint, glass production, food industry, etc. In organic chemistry, calcium hydroxide is widely used as a strong base.

2. Paste calcium hydroxide is used for building materials, protecting tree trunks and painting walls.

3. Liquid calcium hydroxide reacts with carbon dioxide to produce calcium carbonate, and liquid lime milk (calcium hydroxide particles suspended in water) can also be used for water treatment, dry flue gas purification, etc.

The energy saving way in calcium hydroxide production is mainly reflected in the selection of digestion equipment. The trough type drying machine and the wet drying machine are ideal equipment, which can be digested with cold water to keep it in a boiling state, so that the product quality is excellent and the energy consumption is low.

The environmental treatment in the production of calcium hydroxide is mainly alkaline dust treatment. First, a closed production line should be selected. Material conveying, feeding, dividing, and packaging equipment should be closed for operation to prevent the overflow of alkaline dust. The digestion steam should be dry. , Wet dust removal to recover steam and dust; crushing and grinding should be carried out under airtight or slightly negative pressure to prevent dust leakage.

In order to ensure the stable operation of the calcium hydroxide production line and ensure normal production, it is inseparable from the correct installation. For the installation requirements and precautions of the calcium hydroxide production line, the calcium hydroxide production line manufacturer gave us a detailed introduction. One Get up and find out!

Calcium hydroxide production line installation requirements

1. Device positioning

According to the layout of the entire production line and the axis or edge line and elevation line of the building, the installation reference line is delineated. Equipment that is connected, connected or arranged with each other should release a common installation reference line; according to needs, the target board or reference point can be embedded, and the specific basic position line and elevation line can be set.

2. Overall inspection

After installation, check the overall equipment, check the coordinate position of the foundation, the elevations of different planes, the dimensions of the plane, the dimensions of the plane on the boss, the dimensions of the cavity, the level of the plane, the vertical degree of the foundation, and the pre-buried ground. The elevation and center distance of the anchor bolts, the center position, depth and vertical degree of the hole wall of the embedded anchor bolt hole, the elevation and center position of the anchor plate of the embedded movable anchor bolt, the grooved anchor plate and the threaded anchor plate. level, etc.

3. Preload test

The preload test is a preventive measure taken to prevent the installation of heavy equipment from unqualified installation due to uneven subsidence of the foundation after installation. The preload of the test is not less than the sum of the forces acting on the foundation of the equipment under full load operation. The points shall not be affected by the settlement of the foundation, and the observation points shall be no less than four points evenly distributed around the foundation. Observations should be timed and should be until the foundation is substantially stable.

4. Fixed equipment

In addition to movable equipment, other heavy, high-speed, high-vibration mechanical equipment needs to be firmly fixed on the basis of the equipment. If it is not fixed, accidents may occur. Assemble again.

Precautions for the use of calcium hydroxide production line

1. Regular inspection: The calcium hydroxide production line should maintain the equipment during use, and regularly inspect all parts of the production line. If the parts are found to be worn, they should be replaced to avoid affecting the normal operation.

2. Handle abnormal situations in a timely manner: If an abnormal situation is found in the operation of the calcium hydroxide production line, it must be stopped immediately, and the abnormal situation should be checked. After the fault is solved, the production can be continued to avoid unnecessary losses.

After the above introduction, it can be seen that the installation requirements of the calcium hydroxide production line include equipment positioning, overall inspection, pre-loading test, fixed equipment, etc. Handle abnormal situations, so as to effectively reduce the failure rate of equipment and improve the service life of the production line.

Calcium hydroxide, commonly known as hydrated lime, is a material based on limestone and is the “first filler” in the industry. It is a binary medium and strong alkali (calcium hydroxide is considered a strong alkali in the middle school stage, but in fact it cannot be completely ionized in water, so it is considered a medium and strong alkali), with alkali properties, good for skin, fabrics Corrosive.​​

Calcium hydroxide is processed through strict calcination of calcium hydroxide production line, processed into high-quality ash as raw material, and then processed through careful selection. The application fields of calcium hydroxide are becoming more and more extensive. It is a commonly used building material, and is also used as a fungicide and chemical raw materials. The development of the industry is also very rapid. Calcium hydroxide has the following uses in the chemical industry:

1. The application of calcium hydroxide in the coating industry is also very extensive. In addition to being used as a filler in coatings, it also replaces titanium dioxide and pigments, and is also used to replace light calcium and precipitated barium sulfate;

2. Calcium hydroxide is used as a filler for rubber products in the rubber industry, which can improve the processing properties of rubber and improve the mechanical properties of products, such as improving tearing or tearing strength, flex resistance, and achieving initial strength or semi-reinforcing. Effect;

3. The important inorganic filler in the paper industry is still calcium hydroxide! It can improve the penetration and diffusion ability of paper products.

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The above three points are the contributions of calcium hydroxide to the industry. In fact, it also contributes a lot to industries such as water treatment, sewage purification treatment, construction, rubber, plastic filling aids, roadbed reconstruction, incineration, thermal power plant desulfurization, and deacidification.
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In addition, calcium hydroxide has also been widely used in agriculture. It is used in agriculture to reduce soil acidity and improve soil structure. The pesticide Bordeaux mixture is prepared with lime milk and copper sulfate aqueous solution in a certain proportion.
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This sky-blue, viscous suspension pesticide for fruit trees and vegetables uses copper to destroy pests and diseases. It not only utilizes the property that calcium hydroxide can react with copper sulfate, but also utilizes the feature that calcium hydroxide is slightly soluble in water to make the liquid medicine viscous, which is beneficial to the adhesion of the liquid medicine on plant branches and leaves.

In addition, calcium hydroxide reacts with carbon dioxide in the air to form calcium carbonate that is slightly soluble in water, which is also beneficial for the liquid to adhere to the surface of plants for a period of time and not be washed away by rainwater.

The traditional production process of calcium hydroxide is mainly based on manual production, but there are many disadvantages. With the development of society, the scale of mechanized production has gradually expanded, replacing manual production, and it has been widely used. Today, the editor of Zhongcai is here. Let me introduce to you the advantages of calcium hydroxide production line compared with traditional calcium hydroxide production process!

Disadvantages of traditional calcium hydroxide production process

1. Pollution of the environment

Because it is produced by hand, a large amount of high-temperature steam and dust generated during the digestion process will permeate everywhere, and the pollution radius can reach more than 1,000 meters, causing serious damage to the forests and crops within the polluted area.

2. Affect health

Manual production is labor-intensive, the production environment is poor, and the pollution of dust and steam will affect the physical and mental health of production workers.

3. Low production efficiency

The efficiency of manual production is very low. On average, each person does not exceed 1 ton of finished calcium hydroxide during the day. The production scale is small, the average annual output is only a few hundred tons, and the larger scale is only about 5,000 tons. The demand of pharmaceutical food, petroleum, papermaking and other industries.

4. Unstable quality

Manual production is all judged by the experience of the staff. Everyone’s experience is different, so the quality of the finished products is uneven, sometimes good and sometimes bad, which cannot meet the requirements of the petrochemical industry and the fine chemical industry.

Advantages of calcium hydroxide production line

1. Easy to operate

The calcium hydroxide production line has a high degree of mechanization and can be operated only through simple training, with simple operation and low labor intensity.

2. Protect the environment

The mechanical operation reduces the amount of flue gas emissions, and the production line is equipped with dust removal equipment, which reduces environmental pollution and prevents workers’ health from being affected.

3. High production efficiency

The production line has various specifications. The output of small-sized equipment in one hour can exceed the output of labor in one day, and different specifications can be selected according to different output requirements, and the production efficiency is very high.

4. Good quality

The whole production line is controlled by computer, the discharge temperature is controlled at about 45 degrees Celsius, and the water content of the discharge is controlled at about 1%. In this way, the agglomeration of finished products is prevented, and all products are standardized, which meet the needs of users in various industries.

The above is the answer to the question of what are the advantages of the calcium hydroxide production line. After the above introduction, it can be seen that the traditional calcium hydroxide production process will pollute the environment, affect health, low production efficiency and unstable quality. In contrast, calcium hydroxide The production line has the advantages of convenient operation, environmental protection, high production efficiency and good quality.

When it comes to calcium hydroxide, many people may not know what it is. It should be more familiar with slaked lime and slaked lime, especially in chemical experiments and physical experiments. So, in addition to being able to do experiments, do you know any other uses for this calcium hydroxide?

What is calcium hydroxide

Calcium hydroxide is a fine white powder produced by a professional calcium hydroxide production line, which is odorless and slightly bitter in taste. It is easy to absorb carbon dioxide and become calcium carbonate when placed in the air. It is made of calcium oxide, that is, quicklime, digested with water, dried, sieved, and air-selected (or crushed by an extension machine).

The chemical formula Ca(OH)2, commonly known as slaked lime and slaked lime, is formed into two layers after adding water. The upper aqueous solution is called clarified lime water, and the lower suspension is called lime milk or lime slurry.

The supernatant clear lime water can test carbon dioxide, and the lower turbid liquid lime milk is a building material. Calcium hydroxide is a binary medium and strong base (calcium hydroxide is considered to be a strong base in the middle school stage, but in fact it cannot be completely ionized in water. It has the property of alkali and has a corrosive effect on skin and fabrics. It has a wide range of applications in industry. It is a commonly used building material, and is also used as a fungicide and chemical raw materials.

Calcium hydroxide is a strong alkaline substance with irritating and corrosive effects. Inhalation of dust is highly irritating to the respiratory tract and may also cause pneumonia. Eye contact is also strongly irritating and can cause burns.

Uses of calcium hydroxide

With the development of modern industry, lime has opened up a variety of uses in many emerging industrial sectors besides the main material of civil engineering. Such as metallurgy, glass, alkali sugar, paper, food, medicine, feed, leather, calcium carbide and organic chemicals, carbonized bricks, carbonized plates and soil improvement, water treatment, gas purification, stone cutting aids, soil stabilizers, A large amount of lime is used in concrete conditioners, chemical reagents, gypsum board caulking coagulants, building adhesive ingredients, calcium alkane sulfonates, pharmaceutical acid stoppers, astringents, hard water softeners, and plastic fibers.

1. Chemistry: Calcium hydroxide is mainly used for scientific research and development. Its high quality, high content and high price.

2. Medical aspects: Calcium hydroxide is used as a root canal sealant, and it has shown good results in killing microorganisms and reducing the toxicity to root tip tissue. Calcium hydroxide has a high anti-anaerobic effect, has bactericidal effect on Actinomyces naeviteria and Actinomycetales ichthyosis, and can significantly reduce the biological activity of  G-endotoxin, can inhibit root apical tissue dissolution and periapical tissue absorption, induce Repair of periapical bone defects. Use calcium hydroxide powder and propylene glycol to make a thick paste, add an appropriate amount of iodoform to increase sterilization and make cells produce oxidation, and the effect is long-lasting, non-irritating to tissue, can promote the regression of inflammation in the apical area and the repair of lesions, prevent Pus regenerates and eventually eliminates inflammation and repairs root apical tissue.

3. Food industry: due to its strong activity and loose structure, calcium hydroxide is widely used in food additives

4. Industrial aspects: Calcium hydroxide is mainly used as an environmental neutralizer, acid waste water, sewage treatment, boiler flue gas desulfurization and building construction, as well as caustic soda and bleaching powder.

5. Agricultural aspects: it is used in agriculture to reduce soil acidity and improve soil structure; pesticide Bordeaux mixture is prepared with lime milk and copper sulfate aqueous solution in a certain proportion, so that it is used in sky blue viscous suspension pesticides for fruit trees and vegetables , is to eliminate pests and diseases through the copper element in it, which not only uses the properties of calcium hydroxide to react with copper sulfate, but also uses the point where calcium hydroxide is slightly soluble in water to make the liquid viscous, which is beneficial to the medicine The liquid adheres to the branches and leaves of plants. In addition, calcium hydroxide reacts with carbon dioxide in the air to form calcium carbonate that is slightly soluble in water, which is also beneficial for the liquid to adhere to the surface of branches and leaves and not be washed away by rainwater for a period of time.

6. Application in the construction industry: laying bricks, plastering walls, making three-compound soil, etc.

7. In terms of sewage treatment: calcium hydroxide can be used in wastewater to neutralize free acids and acid salts in wastewater; hydroxide ions in calcium hydroxide can react with metal ions to produce water-insoluble precipitates; Adjust the pH value of wastewater to alkaline, which can better precipitate metal hydroxide.

8. In coatings: calcium hydroxide reacts with carbon dioxide in the air to produce calcium carbonate, which is white and hard and can help coagulation.

9. Metallurgical industry: In this industry, in order to coat the metal surface, the impurities (containing metal oxides) on the surface of the metal plate must be removed first, so dilute sulfuric acid must be used to remove them first, and the wastewater generated in the production process should be neutralized with calcium hydroxide. .

10. On refractory materials: when producing silica bricks, it can be used as an additive to enhance the strength and viscosity of bricks. Silica bricks are made from silica with a SiO4 content of not less than 96%, adding mineralizers and binders, and going through processes such as mixing, molding, drying, and firing.

11. Application of calcium hydroxide in flue gas desulfurization : It is mainly used to neutralize acid gases such as sulfur dioxide, sulfur trioxide and a small part of fluoride ion chloride ions, etc., so that the sulfur content of discharged flue gas meets environmental protection standards.

12. Application of calcium hydroxide in leather manufacturing industry: mainly used for combing process in leather manufacturing industry.

13. Learning: applied to students’ classroom experiments.

Calcium hydroxide has a wide range of uses. It is used in medicine, food, construction, etc., and even in classroom experiments in schools. It can be said that it is ubiquitous.