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COAL-MINERAL SORBENTS AS EFFECTIVE SORBENTS FOR REMOVAL OF BORIC ACID

Luisa Beisembayeva

Abstract

Development of new nanostructured carbon sorbents with desired properties is an important task. This corresponds to the carbon-containing sorbents, i.e. active alternative coals, because their usage puts forward increasingly stringent requirements to their strength and structural characteristics. Determination of active centers in sorbents, understanding of mechanisms, which form coal-mineral sorbents, allow to make process of synthesis controlled, and thus provides obtaining of carbon-containing sorbents with certain properties. To study the sorption process of boron, coal-mineral sorbent, carbonized on clay basis at 700 пїЅC and 800 пїЅC, was used. Sorption properties were studied according to the following parameters: equilibration time; S:L phase ratio; boric acid concentrations and number of phases of contacts. Sorption of boric acid by coal-mineral sorbent with such modifying additive, as dimethylformamide (DMF) was investigated. The obtained sorbent shows a sufficiently high selectivity to boron. During three times treatment of boron-containing water by abovementioned sorbent almost 79.5% of boron moves in a solid phase. The results of these studies show that synthesized sorbent can be most effectively used for extraction of boric acid from relatively dilute solutions. After sorption purification, boron content in the aqueous phase is reduced to 0.48 mg/dm3, which corresponds to the MPC of boron.

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