Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.

Removal of selenium from gold heap leachate by activated alumina adsorption

Abstract: Leachates from gold heap-leaching mines may contain selenium concentrations as high as 2 mg/L. Previous studies report satisfactory selenium adsorption by activated alumina from relatively “clean” drinking waters. However, the findings of these studies cannot be directly applied to the treatment of mine leachate where other ions compete for the alumina adsorption sites. This study evaluated the adsorption of selenium from a mine leachate to develop design parameters for a full-scale activated alumina process. The study revealed that 68% of the selenium in the leachate could be removed by alumina at pH levels greater than 5.0. At pH levels less than 4, silica was poorly adsorbed by alumina, and selenium adsorption was improved. Silica adversely affected the selenium adsorption capacity.

Device system for removing fluoride and arsenic from drinking water for urban and rural families

Abstract: The utility model provides a device system for removing fluoride and arsenic from drinking water for urban and rural families The device system comprises an activated carbon filter with a quartz sand filter layer and also comprises an activated alumina filter, wherein a ring-shaped partition plate is arranged inside the sealed container of the activated alumina filter, an integrated dedicated filtering head is arranged on the central hole of the partition plate, gaps are distributed on the arc-shaped part of the filtering head, a water outlet is formed at the lower part of the filtering head, an activated alumina filtering layer is arranged on the surface of the filtering head, a water inlet and a backwashing drainage port are arranged on the top of the container, a backwashing water inlet is arranged on the left side surface of the container below the partition plate, a water outlet is arranged on the right side surface of the container below the partition plate, a washing drainage port is arranged at the bottom of the container, and the water outlet of the activated carbon filter is communicated with the water inlet of the activated alumina filter The device system is economically efficient and practical and provides the healthy drinking water to the urban and rural families

Rare earth liquid composition for coating of catalyst carrier

Abstract: PURPOSE:To improve the activity and adhesiveness of the titled composition obtained by filtering and washing the precipitate obtd. by causing soluble salts of rare earth elements to react with NH3 then heating the same under shaking and to make the combination use thereof with alumina possible. CONSTITUTION:An aq. soln. of soluble salts of >=1 kinds of rare earth elemets is added gradually into excess ammonia water, and is stirred to allow precipitate to form. This precipitate is filtered and washed, after which water is added to the filtrate and the mixture is vigorously shaked, and is heated to 60 deg.C or above. Since the rare earth element liquid composition obtd. in this way contains virtually no free ions, it does not cause gelation in a short time despite direct addition into collidal alumina liquid composition or alumina slurry, thus the uniform liquid composition is obtd. Hence, it is possible to use this composition in combination with activated alumina and to adhere these firmly as a thin film on the surfaces of catalyst carriers.