activated alumina regeneratiuon

- Mar 30, 2018-

Along with the more and more use activated alumina in some application. the very important work is to do the activated alumina regeneration by the users. Now we simply say the activated alumina regeneration.

201801291713326634061.jpgWhen activated  alumina is used for a certain period of time, the adsorption equilibrium  is reached. If it is not processed in time, it cannot be used again. From an economic or resource perspective, the regeneration of activated alumina is the best method.

In  general, all solid substances have the ability to adsorb, but only  porous substances or very finely ground substances can be used as  adsorbents because of their large surface area. The  adsorbent must also meet the following requirements: strong adsorption  capacity; good adsorption selectivity; low adsorption equilibrium  concentration; easy regeneration and reuse; good mechanical strength;  stable chemical properties; It is difficult for  the general adsorbent to meet the requirements of these seven aspects at  the same time. Therefore, it should be selected according to different  occasions.
   ctivated alumina is a hard, aqueous alumina particle. After  dehydrated and activated, the hydrous alumina is activated to form a  porous structure of solid particles or powder, which can be used as  drying of air or gas, concentration and desulfurization of organic  hydrocarbons or petroleum gas, refining of coke oven gas or refinery  gas, and the like。

The heating  regeneration method is the best method for regenerating the activated  alumina with saturated activated organic saturated, and is widely used. By  externally heating the activated activated alumina, the adsorption  equilibrium relationship is changed to achieve the purpose of desorption  or decomposition of the absorbed organic material. Activated  alumina, commonly used for the adsorption of volatile components, can  be desorption and regeneration at lower temperatures. Heat regeneration methods include high temperature heating regeneration method and low temperature heating regeneration method. The  high-temperature heating method regenerates the activated activated  alumina through drying and activation in a regeneration furnace. Into  the regenerative furnace, it is dehydrated and heated to a temperature  above 150°C to evaporate the water in the pores of the activated alumina  and part of the low-boiling sorbate. The activated alumina particles  are gradually dried, and then the active alumina is oxidized under lean  conditions. The temperature is raised to about 350 degrees,  and desorption and desorption of the adsorbate in the pores of  activated alumina are achieved

For activated alumina for water treatment application, how to do actitivated alumina regeneration?

Activated  alumina used in modern water purification is a white spherical porous  particle. It has uniform particle size, smooth surface, large mechanical  strength, strong hygroscopicity, and strong absorption of fluorine. It  is mainly used for drinking water in areas with high fluoride. Fluoride removal. However, any product has a service life or service life. Activated  alumina is no exception. After long-term use, the activated alumina  surface appears yellow-brown, and the effect of defluoridation is  reduced. It cannot be reused when it is saturated.

Therefore,  the saturation regeneration of activated alumina is very necessary.  There are two kinds of regeneration methods for activated alumina. One  is to put the activated alumina after saturation into aluminum sulfate  solution for 30 hours, and then discard the solution and then use clean  water. Wash 3 to 5 times. If there is too much impurity in the solution, it  can be treated with 3% hydrochloric acid once and then regenerated by  the above method.

Another  method is to use dilute nitric acid impregnation and calcination method  to regenerate. After it is washed and dried waste activated alumina,  the activated alumina is placed in the pool and soaked in 8%-20% dilute  nitric acid solution. After  5-25 minutes, the impregnated activated alumina is washed with water  and dried. The dried material is placed in a kiln and naturally cooled  to room temperature after calcination. The  active alumina treated by the method has low processing cost and good  product activity has important environmental protection and economic  benefits.