Activated alumina is a porous, highly dispersed and large specific surface area alumina with adsorption and catalytic activity. It is suitable for drying a variety of gases and liquids. It is used as adsorbent, desiccant, catalyst and carrier in many reaction processes such as petroleum, fertilizer and chemical industry. Activated alumina can be divided into Y type and Y-P type according to its internal main crystal composition. According to its use, it can be divided into activated alumina adsorbent, activated alumina desiccant and activated alumina catalyst carrier. Activated alumina is widely used for defluoridation, arsenic removal, sewage decoloration, deodorization, etc. It can also be used as a drying agent to produce hydrogen peroxide.
The activated alumina ball has many capillary channels and large surface area, which can be used as adsorbent, desiccant and catalyst carrier. At the same time, it is also determined according to the relative strength of the adsorbed material. It has strong affinity to water, oxides, acetic acid, alkali, etc. It is a kind of desiccant with micro water and high degree, and is also an adsorbent for adsorbing relatively molecules. Fluorine removal by activated alumina is similar to that of anion ion exchange resin However, the selective anion resin for fluoride ion is large, the adsorption and defluorination effect of activated alumina is good, the capacity is stable, and the activated alumina absorbs 6400 grams of fluoride per cubic meter. This product has high strength, low wear, no swelling, no pulverization, and no cracking when immersed in water. It can be widely used in oil cracking gas ethylene The high-level drying and hydrogen production of C gas, the drying of air separation unit and instrument air dryer, and the fluoride treatment of dioxygenated water can also remove sulfur gas hydrogen, sulfur dioxide, hydrogen fluoride, hydrocarbons and other pollutants in the exhaust gas, especially suitable for the fluoride removal of fluorinated water.
Product description [Activated alumina] mainly has two variants, alpha and gamma, which can be extracted from bauxite in industry. Bauxite (Al2O3 · H2O and Al2O3 · 3H2O) is the main mineral of aluminum in nature. After crushing, it is soaked with high-temperature sodium hydroxide solution to obtain sodium aluminate solution; Filter to remove the residue, cool the filtrate and add Aluminium hydroxide After a long time of stirring, the sodium aluminate solution will decompose and precipitate aluminum hydroxide; The precipitate is separated, washed, and calcined at 950-1200 ℃ to obtain alpha oxidation Aluminium powder At the end of the day, mother liquor can be recycled. This method was invented by Austrian scientist K.J. Bayer in 1888 and is still the main method for industrial production of alumina today, known as the "Bayer method". In the lattice of alpha alumina, oxygen ions are closely packed in six directions, Al3 is symmetrically distributed in the octahedral coordination center surrounded by oxygen ions, and the lattice energy is very large, so the melting point and boiling point are very high. Alpha alumina is insoluble in water and acid, also known as aluminum oxide in industry, and is the basic raw material for making aluminum metal; It is also used to make various refractory bricks Refractory crucible, refractory pipe, high temperature resistant experimental instrument; It can also be used as abrasive, flame retardant, filler, etc;
High purity alpha alumina is also the raw material for producing artificial corundum, synthetic ruby and sapphire; It is also used to produce the board base of modern large-scale integrated circuits. Type alumina is produced by dehydration of aluminum hydroxide at a low temperature of 140 - ℃. It is also called activated alumina and aluminum glue in industry. The oxygen ions in its structure are closely stacked in a cubic face center, Al3 is irregularly distributed in octahedral and tetrahedral voids surrounded by oxygen ions. γ - alumina is insoluble in water, but can be dissolved in strong acid or alkali solutions. When heated to 1200 ℃, it will all be converted into α - alumina. γ - alumina is a porous material, with an internal surface area of hundreds of square meters per gram, high activity and strong adsorption capacity
Industrial products are usually colorless or slightly pink cylindrical particles with good pressure resistance. They are commonly used as adsorbents, catalysts and catalyst carriers in petroleum refining and petrochemical industry; In industry, it is a deacidifying agent for transformer oil and turbine oil, and also used for chromatography analysis; In the laboratory, it is a neutral strong desiccant, whose drying capacity is no less than that of phosphorus pentoxide. After use, it can be renewed and reused after being heated for 6-8h under 175 ℃. At present, the alumina produced by Bayer process accounts for more than 90% of the total output in the world. Most of the alumina is used to make metal aluminum, and less than 10% is used for other purposes. Product introduction:
Activated alumina is a porous, highly dispersed and large specific surface area alumina with adsorption and catalytic activity.
Activated alumina is a kind of solid material with high porosity and dispersion, which has a large specific surface area, good adsorption performance, good pressure resistance, wear resistance and heat resistance. Therefore, it is widely used as adsorbent, desiccant and catalyst carrier for various reactions.
This product is used for defluorination agent in the production of alkyl benzene and defluorination of drinking water.
Packaging: This product is packed in double layers, with plastic woven bags on the outer layer and plastic film bags on the inner lining. The net weight of each bag is 25kg. Special packaging will be determined separately.
Precautions: When the surface of the activated alumina defluoridation agent appears yellowish brown, the defluoridation effect is significantly reduced, which is caused by the impurity pollution in the water. Therefore, it is better to treat it with 3% diluted hydrochloric acid every six months, and the operation method is the same as the update method. There are a lot of harmful substances such as fluorine and arsenic in the water of northwest China, which can be absorbed by activated alumina. Remove harmful substances from water.
Alumina is a white amorphous powder, commonly known as bauxite, with a density of 3.9-4.0g/cm3, a melting point of 2050 ℃ and a boiling point of 2980 ℃. It is insoluble in water. Alumina mainly has two variants, alpha and gamma, which can be extracted from bauxite in industry
Bauxite (Al2O3? H2O and Al2O3? 3H2O) is the main mineral of aluminum in nature. It is crushed and soaked with high-temperature sodium hydroxide solution to obtain sodium aluminate solution; Filter to remove the residue, cool the filtrate and add aluminum hydroxide crystals. After a long time of stirring, sodium aluminate solution will decompose to precipitate aluminum hydroxide; The precipitate is separated and washed, and then calcined at 950-1200 ℃ to obtain alpha alumina powder. The mother liquor can be recycled. This method was invented by Austrian scientist K.J. Bayer in 1888, and is still the main method for industrial production of alumina today, known as the "Bayer process"
Characteristics of aluminum oxide powder:
In the lattice of α - type aluminum oxide, oxygen ions are closely packed in six directions. Al3 is symmetrically distributed in the octahedral coordination center surrounded by oxygen ions. The lattice energy is large, so the melting point and boiling point are high. α - type aluminum oxide is insoluble in water and acid, also known as aluminum oxide in industry, and it is the basic raw material for manufacturing aluminum metal; It is also used for making various refractory bricks, refractory crucibles, refractory pipes and high-temperature experimental instruments; It can also be used as abrasive, flame retardant, filler, etc; High purity alpha alumina is also the raw material for producing artificial corundum, synthetic ruby and sapphire; It is also used to produce the board base of modern large-scale integrated circuits
γ - alumina is prepared by dehydration of aluminum hydroxide at a low temperature of 140-150 ℃. It is also called activated alumina and aluminum glue in industry. The oxygen ions in its structure are close packed in the cubic face center, Al3 is irregularly distributed in octahedral and tetrahedral voids surrounded by oxygen ions. γ - alumina is insoluble in water and can be dissolved in strong acid or alkali solutions. When heated to 1200 ℃, it will be completely transformed into α - alumina. γ - alumina is a porous material, with an internal surface area of hundreds of square meters per gram, High activity and strong adsorption capacity. Industrial products are usually colorless or slightly pink cylindrical particles with good pressure resistance. They are commonly used as adsorbents, catalysts and catalyst carriers in petroleum refining and petrochemical industry; In industry, it is a deacidifying agent for transformer oil and turbine oil, and also used for chromatography analysis; It is a neutral strong desiccant in the laboratory, and its drying capacity is no less than that of phosphorus pentoxide. After being used, it can be renewed and reused after being heated at 175 ℃ for 6-8h
