SU489302A3 - The method of separation of aluminum from solutions - Google Patents

Description

-I

This invention relates to a process for separating aluminum salts from wastewater solutions of large-scale synthesis. When using Friedel-Kraft-S skates, they are used as a catalyst in the preparation of ethylbenzene and Kumo products of the aluminum salt,

For example, h.tC.t, are as organic.

The main components of the process are waste water components. For wastewater treatment, along with the removal of organic components, it is necessary to remove aluminum contained in the wastewater in order to prevent its subsequent precipitation when the pH of the sewage system, receivers, etc., changes.

There is a known method for separating aluminum from solutions by alkalinizing and purging with gas containing CO, followed by separating the aluminum hydroxide that forms. According to this method, t-hydroxide of aluminum is released in the form of a mixture of boehmite of the V modification and bayerite, which is due to its oHBHi structure. A bad posture is filtered and filtered. Successful deposition

(It is possible to achieve the addition of organic and inorganic coagulants, for example, ep anionic, cationic, amplolitic high polymers or ash-like polystyrene. Filtering oxyhydrate is economically possible only when using an auxiliary filtering layer. In addition, it is known that the best properties of the heart are used alone. Filtration has an Ag. Iumini hydroxide modification.

The purpose of the invention is the separation of hydroxide: alyuminy in the form of the CX-modification from waste water.

for this purpose, it was proposed to separate from the source water containing n “bo-

3+

more than 1O g / l AS; Slapping before and purging with gaeom. containing CO, - in quantity 1O-25 vol.% at a rate of l aza nv 1 n water at i h. The method is carried out as follows. Acid effluent and neutral water - caustic liquor, for example, soda ash; “; In the next stage, the resulting aluminate solution is treated with carbon dioxide or carbon dioxide-containing gas. The resulting hydroxide is characterized in a different way, as it has been experimentally proved, which is very good in terms of precipitation and filtration. The deposition rate increases by three times, and the throughput of filtering aggregates increases by a factor of ten compared with conventional methods. Alk mini hydroxide allows filtering without the need for a primer layer 51, which is required for normal filtration. This ensures, due to the reduction in the size of the precipitating filters, the devices, the possibility of economical removal and the dehydration of the discharge.

Approx. 1 m of wastewater from the EOBKJ-i plant for the production of ethylene benzene, with

holding 5 g / l A € С-, at pH 3.8 under

Ideal for 10 l 50% caller ID The pH of the iodine melt is up to 10.4, and aluminum goes into aluminate. Subsequently

carbon dioxide treatment neutralizes wastewater to a pH of 7 (1. Aluminum hydroxide quantitatively drops out in the form of 4 — odds.) After 30 minutes, the solid matter content is solid; In the sludge it rises from 0% to 6%, ICTOK is free from mechanical impurities. Convicted aluminum hydroxide is filtered on a semi-industrial vacuum and rotating filter, 0.5 m without an additional filtering layer, skipping the filtrate reaches 1000 L / m ± h. Wasted from wastewater to residual.

J5 content 5 mg / l

 Subject invention

;

The method of separating aluminum from rastheors by way of hauling and blowing through: the 3rd containing CO, followed by &

separation of the formed aluminum hydroxide, characterized in that, in order to separate aluminum hydroxide in the Bidet -Modification from waste water, the release is at the aluminum content in the original water, not more than 1O g / l

f3 +

A .., alkalinization before, and purging with a gas containing CO in the amount of 10-25% by volume at a rate of l; gaa 1 water in 1 chao.