The use of activated alumina in water treatment purification

Activated alumina is generally one of the inorganic chemical products widely used in the world at that time. Because activated alumina has a porous structure, high specific surface area and is in an unstable transition state, it has greater activity. In the petrochemical and fertilizer industries, it is widely used as catalyst and catalyst carrier. Activated alumina also has adsorption properties, so it is used as a desiccant for gases and liquids, an adsorbent for gas purification, a fluoride remover for drinking water, and a color and odor remover for industrial sewage.

1. Water treatment purifier

This product is used as a fluoride removal agent for high fluoride water, making a molecular adsorbent with a huge specific surface area. When the PH value and alkalinity of the raw water are low, the fluoride removal capacity is higher, and the fluoride removal is similar to the anion AC resin, but the selective anionic resin for fluoride ions is large, greater than 2. 1mg/g, the price is lower than synthetic resin, and can also be used for drinking water to remove arsenic. The specific surface area of this product is large, the commonly used standard is generally 3-5mm, and the water has a large touch area when used, the specific surface area index is as high as 260㎡ / g or more, the number of micropores is huge, which can ensure that the fluoride ions in the water have a strong adsorption ability and high fluoride removal, arsenic removal capacity. 6400 grams of fluorine absorption per cubic meter of activated alumina. Activated alumina fluoride remover, can be used in conjunction with household fluoride removal cylinder, containing fluoride remover 1. 6 kg, water from below, top out, fluoride removal cylinder simple operation, easy to use, is the ideal drinking water fluoride removal equipment in the family. Fluoride removal agent can also be used in conjunction with fluoride removal and arsenic removal equipment in waterworks or industrial fluoride removal and arsenic removal equipment. Activation of fluoride remover in household fluoride removal equipment: equipped with aluminum sulfate solution (3 liters of water, 0. 3kg solid aluminum sulfate), pure alumina fluoride remover put into the above solution, soak for 5-10 hours to discard the immersion solution (soak to mix appropriately) and then wash with clean water 3-5 times, each time with 2 liters of water. Regeneration of household fluoride remover: with aluminum sulfate solution and activation solution, the regenerated alumina fluoride remover is put into the above solution to soak for 30 hours, discard the immersion solution (soaking should be properly mixed) and then wash with water 3-5 times, each time with about 2 liters of water. Perhaps regeneration by pH modulation, pH control at 5. 5。

2. Activated alumina fluoride remover

The activated alumina is placed in the columnar equipment, when the water passes through the activated alumina stuffed in the columnar container, the pollutants and other substances in the water are adsorbed on the surface of the particles, the upstream of the initial column becomes full, and as more water flows through, the fullness zone moves downward, and finally reaches full fullness. The fluoride removal of activated alumina is closely related to the PH value of raw water, and the pH value = 5. At 5, the adsorption capacity is large, so the pH value of the raw water is adjusted to 5. About 5, the adsorption efficiency of activated alumina can be added. The raw water is selected by adding carbon dioxide gas to reduce the PH value of the raw water, which can improve the adsorption capacity of activated alumina, and the particle size of activated alumina has a linear relationship with the adsorption capacity, and the adsorption capacity is large if the particles are small, generally 1. 2—4。 5mg。 However, small particles are lost during repeated washout and are simply dissolved by the regenerative NaOH. Therefore, the commonly used particle size in China is generally 1-3mm, 2-4mm, 3-5mm. It can be widely used in the drying of petroleum cracking gas, ethylene propylene gas, viscous resin dechlorination, hydrogen production, fluoride treatment in hydrogen peroxide, fluoride remover in alkyl benzene production, and can also remove sulfur hydrogen, sulfur dioxide, hydrogen fluoride, hydrocarbons and other pollutants in waste gas.