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The hardness of white corundum is slightly higher than that of brown corundum, with low toughness, high purity, good self sharpening, strong grinding ability, low calorific value, high efficiency, acid and alkali corrosion resistance and high temperature thermal stability
White corundum is suitable for sandblasting of metal products, surface treatment of glass, handicrafts and plastics, sandblasting of clocks, toys and lamps, etc. silicon carbide it can remove rust, oil, burr, impurity, oxide scale, increase friction, remove residual stress and improve mechanical properties.
Corundum is made of industrial aluminum oxide powder, which is melted at a high temperature of more than 2000 degrees in electric arc. It is crushed and shaped, removed iron by magnetic separation, and sieved into various particle sizes. Its texture is dense and its hardness is high, and the particles are spherical. Corundum is suitable for manufacturing ceramics, resin bonded abrasives, grinding, polishing, sand blasting, precision casting, etc., and can also be used to manufacture high-grade refractory materials The code "WA" is consistent with the international general standards and national standards. Most of them are for export and a certain amount is supplied to domestic users.
Product granularity according to international standards and national standards production, can be processed according to user requirements. The general particle size is F4 ~ F320, and its chemical composition varies with particle size. The outstanding feature is that the crystal size is small, impact resistance, because the autogenous mill processing broken, particles are mostly spherical particles, the surface is dry and clean, easy to bond.
The density of corundum is divided into two types: corundum and corundum.The bulk density is 1.53 ~ 1.99g/cm3. Generally speaking, the bulk density of coarse-grained abrasive is higher than that of fine-grained abrasive, and the bulk density of mixed abrasive is greater than that of single particle size.
Activated carbon, also known as activated carbon black, is a black powdery or granular amorphous activated carbon.wood activated carbon powder The activated carbon adsorption method uses porous activated carbon to remove one or more substances in water by adsorbing on the surface of activated carbon. The removal objects include soluble organic substances, synthetic detergents, microorganisms, viruses and a certain amount of heavy metals. And can decolorize, deodorize, and purify air.
The main raw materials of activated carbon can be almost all carbon-rich organic materials, such as coal, wood, fruit shells, coconut shells, walnut shells, apricot shells, date shells, etc. These carbon-containing materials are converted into activated carbon by pyrolysis under high temperature and certain pressure in an activation furnace.
During this activation process, a huge surface area and complex pore structure are gradually formed, and the so-called adsorption process is carried out in these pores and on the surface. The size of the pores in the activated carbon has a selective adsorption effect on the adsorbate. Because macromolecules cannot enter the activated carbon pore size smaller than its pores.
Activated carbon is a hydrophobic adsorbent made from carbon-containing materials as raw materials and carbonized and activated at high temperatures.coal pellet activated carbon Activated carbon contains a large number of micropores and has a huge surface area, which can effectively remove color and odor, and can remove most organic pollutants and some inorganic substances in the secondary effluent, including some toxic heavy metals.
Activated carbon used for a certain period of time, its adsorption capacity will reach a bottleneck, affecting its function, so the product should be exposed to the sun regularly, keep the activated carbon dry, repeated use, to achieve the effect of extending the life of the product.
Wood powder activated carbon is refined and processed from some carbon-containing organic raw materials such as fruit shells and sawdust. The appearance of this product is black powder, strong adsorption capacity, non-toxic, odorless, large specific surface area, strong acid and alkali resistance, water immersion, high temperature, suitable for deep purification of water quality such as sugar, pharmaceuticals, beverages, and alcohol. It is also widely used in the decolorization, refining, purification and sewage treatment of organic solvents.
Because of its special water treatment effect, wood powder activated carbon is an advanced water treatment material compared to nut shell activated carbon and coconut shell activated carbon. activated carbon manufacturer south africa The physical adsorption of wood powder activated carbon is the adsorption produced by the molecular gravity between the adsorbate and the adsorbent, and its characteristics are:
1. No chemical reaction occurs, it can proceed at low temperature;
2. Physical adsorption can be single-layer adsorption or multilayer adsorption;
3. Due to thermal movement, the adsorbate can be freely transferred on the surface of the adsorbent, so it is easier to desorb;
4. The surface energy decreases during adsorption, so it is an exothermic reaction. Generally, the heat released per mole of adsorption is less than 20.9kj;
5. The adsorption selectivity is poor. For various substances, it is only the difference in the intermolecular force. The molecular attraction increases as the molecular weight increases. For the same series of compounds, the adsorption increases with the increase of molecular weight, which is called the Traube rule.
The chemical adsorption of wood powder activated carbon is a chemical effect between the adsorbate and the adsorbent due to the chemical bond force, which changes the chemical properties. The zinc particles adsorb mercury in the water to form a zinc amalgam alloy.
The characteristics of chemical adsorption are:
1. Generally monolayer adsorption;
2. Chemical adsorption is often carried out at high temperature;
3. The adsorption is selective. When the chemical bond is strong, the adsorption is irreversible;
4. The adsorption heat is large, which is equivalent to the energy of chemical bonds, that is, the heat of chemical reaction.
Consumers are reminded that when buying nutshell activated carbon, you must choose a product with a higher reputation, and carefully check the product name, production date, shelf life and related indicators.
Generally speaking, the finer the nutshell activated carbon particles, the larger the surface area, and the stronger the adsorption capacity. activated carbon powder There are several simple methods to determine the quality of nutshell activated carbon.
1. Look at the density
Generally speaking, the better the quality of husk activated carbon, the higher the iodine value. Due to the abundant adsorption space, the specific gravity of husk activated carbon is very light. Take a handful, the lighter the husk activated carbon is, the better.
2. Look at the bubbles
Throw a handful of nutshell activated carbon into a beaker filled with water, and a series of small dense bubbles will appear, accompanied by a sizzling sound. You can compare two different nutshell activated carbons. The more intense the phenomenon, the longer the duration. The longer the shell activated carbon is, the better.
3. Look at discoloration
The decolorization ability is also a major feature of nutshell activated carbon. Put the nutshell activated carbon in the ink for a period of time, and the color of the water that comes out will obviously change. Compare the decolorization ability of the nutshell activated carbon.
4. Look at adsorption
Remove a sample of husk activated carbon and put it on the tip of the tongue. If it is good charcoal, the sensation of adsorption will be transmitted on the tip of the tongue. The better the husk activated carbon, the stronger the effect.
5. Look at deodorization
Take a paper cup and spit a few smoke into the cup. Let it sit for a few minutes and you will find that the smell of smoke remains inside the quilt. chengde wanyang activated carbon At this time, put a small amount of nutshell activated carbon in the quilt, seal the cup and wait for a few minutes, and then look inside the quilt Whether there is residual smoke smell.
coal pellet activated carbon for air purification has developed pores. This kind of products are mainly used for air purification, toxic gas filtration, gas purification and removal of organic solvents such as paint, formaldehyde, benzene, ammonia, etc., and can also be used for organic solvent purification, decolorization and deodorization of aqueous solutions, high-purity water manufacturing and carriers of various precious metals. It is used for the purification of chemical raw material gas, chemical synthesis gas, pharmaceutical industry gas, carbon dioxide gas for beverage and hydrogen, nitrogen, hydrogen chloride, inert gas, etc., and purification of atomic facilities. It is also used for the separation and purification of pollutants in the air and mixed gas.
Activated carbon for purification gas is suitable for purification, discharge, absorption, storage, separation and purification of chemical raw materials and synthetic gases; it is used to remove odor and harmful substances in the operation room; it is used for purification and discharge of ammonia, hydrogen sulfide, amine, mercaptan, methyl sulfide and other substances in food industry, sewage, garbage treatment facilities, fertilizer plants, etc.
The activated carbon for air purification is made of fruit shell through deep activation and scientific technology. It has developed pore structure, large specific surface area and high adsorption performance. It is non-toxic and harmless. This product is a special green environmental protection product with pertinence and specificity developed according to the needs of environmental protection and human health. It is suitable for the purification and discharge, absorption, storage, separation and purification of chemical raw materials and synthetic gases; it is used to remove the odor and harmful substances in the operation room; it is used for the purification and discharge of ammonia, hydrogen sulfide, amine, mercaptan, methyl sulfide and other substances in food industry, sewage, garbage treatment facilities, fertilizer plants, etc.
Air purification activated carbon can effectively remove and adsorb
1. The harmful substances and odor gases (such as formaldehyde, benzene, TVOC, smoke, etc.) emitted by various materials after the decoration of the room can improve the indoor air quality and living environment and protect human health.
2. Harmful substances and odor gases (such as formaldehyde, benzene, TVOC, smoke, etc.) emitted from various materials in the car can improve the air quality in the car and protect the health of drivers and passengers.
3. It can quickly eliminate the bad smell in the refrigerator and keep the food fresh.
Activated carbon in activated carbon adsorption device of metallurgical plant is a kind of very fine carbon particles with large surface area, and there are even smaller pores capillary tubes in the carbon particles. Because of the large surface area of carbon particles, it can fully contact with gases (impurities); when these gases (impurities) come into contact with capillaries, they will be adsorbed, so as to purify the gas.
According to the different forces between activated carbon molecules and pollutant molecules in the process of adsorption, adsorption can be divided into two categories: physical adsorption and chemical adsorption (also known as active adsorption). granular activated carbon manufacturer In the process of adsorption, when the interaction between activated carbon molecules and pollutant molecules is van der Waals force (or electrostatic attraction), it is called physical adsorption; when the force between activated carbon molecules and pollutant molecules is chemical bond, it is called chemical adsorption.
The strength of physical adsorption is mainly related to the physical properties of activated carbon, but not to the chemical properties of activated carbon. Because van der Waals force is weak, it has little effect on the structure of pollutant molecules. This force is the same as intermolecular cohesion force, so physical adsorption can be compared to condensation phenomenon. The chemical properties of pollutants remain unchanged during physical adsorption.
Due to the strong chemical bond, the structure of pollutant molecules is greatly affected. Therefore, chemical adsorption can be regarded as a chemical reaction, which is the result of chemical interaction between pollutants and activated carbon. Chemisorption generally involves electron pair sharing or electron transfer, rather than simple perturbation or weak polarization, and is an irreversible chemical reaction process. The fundamental difference between physical adsorption and chemical adsorption lies in the force producing the adsorption bond.
In short, there are unbalanced and unsaturated molecular gravitation or chemical bonding force on the solid surface of activated carbon. When the solid surface contacts with the waste gas, it can attract gas molecules and make them concentrate and maintain on the solid surface, so that pollutants and odors can be adsorbed. After being used for a period of time, activated carbon adsorbs a large amount of organic pollutants, gradually tends to saturation, and loses the working capacity. At the same time, the system resistance also increases. Therefore, activated carbon should be regenerated or replaced regularly.
You can buy ready-made carbon pellets skin and hair care products from large pharmacies and health food stores, including pore care and exfoliating scrub. However, if you want to make it yourself, the powder you buy to whiten your teeth will be of great help to your skin and hair. Here are some ways to try.
Making transparent mask
Add a teaspoon (5 mg) of powdered activated carbon to warm water or warm water until a paste is formed. Then add a teaspoon of honey (5 ml) or aloe vera gel, and put a thin mixture on your face. Rinse after five to ten minutes.
Add detoxification to shampoo
Add a teaspoon (5 ml) or activated carbon capsules to your regular shampoo; rinse and rinse as usual. For light colored hair, an extra rinse will remove all discoloration from the charcoal.
Deep cleaning body scrub
You can add activated carbon powder to your usual Body Scrub (empty 2 to 3 capsules for this purpose) and use as directed.
Keep in mind that activated carbon is not recommended for daily use, but is used like any other deep cleaning product. Don't use it on dry hair or skin as coal activated carbon pellets dehydrates and you don't want to lose more water. When you try to use a new product, test it to make sure it doesn't get dirty. Although you don't have to worry, activated carbon hair products that leave color should be washed with regular shampoos, which are still good for hair and scalp.
Activated carbon powder can also be used to make pastes to treat small wounds, skin irritation, allergic reactions, insect bites and St injuries, and to eliminate minor infections (when mixed with baking soda). For more serious cases, seek treatment.
Activated carbon is a therapeutic adjunct and a leading product in hospital emergency rooms around the world. Today, activated carbon is recovering as more and more people understand the benefits and uses of this natural therapy.
Activated carbon is made by burning yongruida carbon sources such as coal, wood or coconut shell (coconut is the best choice for natural therapy). When heated, the high temperature removes all oxygen from the source and leaves material with millions of openings. One of the processes in which substances and toxins can be trapped in the body through another is called chemical adsorption. Therefore, instead of absorbing and digesting activated carbon, it is better to remove it from the body together with all the toxic substances attached to it.
Activated carbon is the most well-known safe treatment for hospital poisoning and drug overdose, but this is not all. Look at my five favorite household products to change my life.
Activated carbon is ideal for removing toxins and chemicals that may be accidentally absorbed, or in the case of overdose or over-the-counter drugs. Most organic compounds, pesticides, bleaches and Mercury will bind to the surface of the activated carbon, thus eliminating them more quickly.
Thanks to the ability of activated carbon to absorb toxins and excess oil, it can make the oil in the pores drain out of the pores, and as a natural acne treatment, it will not dry the skin like other drugs, which is very good.
One of my favorite love treatments is mixing the active carbon capsule with two teaspoon aloe gel. Mix and apply to the face, away from the eye area. Dry it and rinse the mask to remove bacteria that may cause acne. Do this once a week to refresh your skin and smooth pores, or use the same mixture as spot therapy to treat particularly severe acne.
After refreshing your skin, you can also use a soft, greasy chain. If hair is heavy from product residues, coconut activated carbon can remove residues and increase hair volume. Just add a teaspoon of powdered activated carbon to your regular shampoo and wash as usual. Charcoal will absorb excess oil and make your hair smooth and glossy.
Activated carbon is a kind of charcoal which has been treated (usually heated or pressurized) to improve its adsorption capacity. Charcoal has an extremely strong adsorption and may be very useful in solving various health problems characterized by excess of a specific substance. The porous surface of YrdCarbon means that it can absorb toxins and poisons better than many other natural substances. That's why charcoal was used in gas masks in World War I.
Whitening teeth. Charcoal has the effect of whitening teeth. This is because charcoal's natural bonding properties enable it to combine with and remove stains on the surface of teeth (such as tea, wine, coffee, etc.).
Relieve flatulence. Activated carbon prevents gas formation in the gut after a typical gas producing meal.
Relieve the hangover. Charcoal does not absorb alcohol, but it can deal with other toxins remaining in the body associated with the consumption of different types of alcohol, such as chemicals and sweeteners (e.g., the toxin with the most toxins in all alcohol in beer). After drinking, take yongruida carbon pellets to see if it helps to relieve the sense of disorganization.
Filter the water. Activated carbon catches impurities in water, including chlorine and other chemicals, mineralizes water and balances pH.
At present, more than 90% of the alumina and aluminum hydroxide produced worldwide are produced by the Bayer process. The higher the Al2O3 content, the better the various technical indexes of smelting corundum. SiO2 is a harmful impurity in the production of alumina by the alkaline method. fused alumina manufacturer However, when the ball milling time is extended to a certain limit, the pulverization effect is reduced. For fine powder. The higher the content, the better.
Al2O3 is the main component in bauxite. At present, the production of industrial alumina requires an aluminum-silicon ratio of not less than 3.0 to 3.5. Other oxides are regarded as impurities. The high content of SiO2 in bauxite will reduce the production efficiency of smelting brown corundum or the production of industrial garnet abrasive and increase the impurity component. Al2O3-H2O crystalline compounds can be prepared by artificial methods.
The quality requirements of high alumina bauxite include chemical composition, dehydration degree, particle size, etc., because these factors will affect the brown corundum smelting technical indicators and product quality to varying degrees. High alumina bauxite is the raw material to provide Al2O3, which is the main component of corundum. With the increase of Al2O3 content, the unit power consumption decreases. Therefore, the smelting of brown corundum requires the use of high-quality bauxite as much as possible.
Different types of bauxite have different crystal states due to their alumina, so the reaction ability with sodium aluminate solution will naturally be different. Even if the same type of bauxite has different crystal integrity due to different places of origin, its dissolution performance will be different. The dissolution performance of different types of bauxite will be discussed below. In gibbsite type bauxite, emery abrasive mainly exists in the form of gibbsite (Al2O3 · 3H2O).
As we all know, special refractories are a group of new refractories developed on the basis of traditional ceramics and refractories, also known as high temperature ceramics. Ceramic is named after technology.fused alumina Usually, products made by powder making, molding, sintering and other processes are called ceramics. It can also be said that special refractories are refractory products made of ceramic production process. The slurry shall have good suspension and fluidity.