SU835956A1 - Method of producing granulated alumosilicate adsorbent - Google Patents

Description

(54) METHOD FOR OBTAINING GRANULATED AL-MOSYLICATE ADSORBENTS

The invention relates to the field of sorbent synthesis for the recovery of elements from solutions. A method of producing aluminosilicate zeolite adsorbents is known by mixing solutions of sodium aluminate and liquid glass or treating the aluminosilicate-containing material with aqueous, sodium hydroxide solution, with further crystallization of the resulting alumina silica, washing it from excess alkali, granulating, drying and calcining. But the dynamic capacity of the aluminosilicate adsorbent obtained by these methods is very low I. The closest to the technical essence and the achieved result to the proposed method is the production of granular zeolite adsorbents by mixing solutions of liquid glass and sodium aluminate, crystallization, washing the resulting alumina from alkali, granules and treating the granulated zeolite adsorbent with an alkaline solution, for example, or NaOH 2. The disadvantage of the method is that during processing With an alkaline solution, a part of the primary zeolite is converted into the final crystalline aluminosilicate zeolite having a lower molar ratio SiOfjA gP With a change in the molar ratio, the cation density in the sorbent decreases, which leads to a decrease in its selectivity, and its dynamic capacity still remains insufficiently high (103 -104 mg / cm). The aim of the invention is to increase its dynamic capacity. This goal is achieved by mixing solutions of liquid glass and sodium aluminate, crystallization, washing out the obtained hydrogel from excess alkali, granulation, processing with a silk solution (2-5 ° / with an ammonium hydroxide solution) and processing 1-5% aluminum sulphate solution, followed by exposure to ammonia solution and washing with distilled water. A distinctive feature of the method is an additional treatment with a 1-5 / th solution of aluminum sulphate, followed by a delay in ammonia solution and the use of a 2-5% solution of ammonium hydroxide as the alkaline solution.

The concentration of NH + OH in the range of 2 to 5% solution was determined experimentally. Increasing the concentration above the 5% solution does not have such a significant effect on the capacity of the adsorbent. Thus, when processing a 5% aqueous solution of NHi, the PH capacity of the adsorbent was 170.9 mg / cm, and at 107 ° C 172.3 mg / cm, therefore, it does not make sense to increase the concentration of NHgOH above b / o.

When the adsorbent was treated with a solution of A1; g (5O4) above 5%, the dynamic capacity of the sorbent did not change, therefore the results of processing the adsorbent to an AljlSO concentration value of 5% are reported. In addition, all combinations of solution concentrations and AC (504) 3 were experimentally tested and the most effective of them were selected.

The results of processing and testing of the sorbent obtained in examples 1-4, are summarized in table.

The dynamic capacity of the sorbent is determined for solutions containing mouse k.

Example 1. 100 g of a hydrogel spherical aluminosilicate were poured with 300 ml of a 2% aqueous ammonia solution and kept for 2 hours; after decontamination, the aluminosilicate hydrogel was activated with 100 ml of a 1% aqueous solution of aluminum sulphate, the activation process was repeated 3 times, t. e.

5.0p

88.0 81.4 79.7 77.7 74.4 74.2 Ae, 2 Oz Dynamic capacity, 103.1 82.797.6 mg / cm

Claims (2)

1. A method of producing granulated aluminosilicate adsorbents by mixing solutions of liquid glass and sodium aluminate, crystallization, washing the resulting hydrogel from an excess of alkali, granulation and treatment with an alkaline solution, characterized in that the aluminosilicate hydrogel was subjected to triple activation with aluminum sulphate for 20 h, then the hydrogel was poured with 2 ° / oh aqueous ammonia solution and kept for 2 A, then through a layer of sorbent Distilled water was passed at a rate of 6, .7 l / h to a negative reaction to S0 | then the content of Si (and AUO in the sorbent was determined. The total dynamic capacity of the sorbent was 169 mg / cm. Example 2. The hydrogel of a ball aluminosilicate was subjected to the same treatment as in example 1, however, instead of 2 / o-aqueous ammonia solution, 3/3 was used, and instead of l / o-horo aluminum sulphate solution 2% was taken . The total dynamic capacity of the sorbent was 159.8 mg / cm Example 3. The hydrogel ball aluminosilicate was treated in the same way as in example 1, but instead of 2 / o-th took 5% aqueous ammonia solution, and instead of 1% used 3% aqueous solution of ammonia. The total dynamic capacity was 170.9 mg / cm. Example 4. The hydrogel ball aluminosilicate is treated the same as i in Example 1, but instead of 2% aqueous ammonia pactor, 10% was taken, and instead of 1% solution of aluminum sulphate, 5% was taken. The total dynamic capacity of the sorbent was 172.3. its alkaline capacity, granulated hydrogel of aluminosilicate after alkaline treatment is additionally subjected to treatment with 1-5% aluminum sulphate solution, followed by exposure to ammonia solution and washing with distilled water. 2. The method according to claim 1, characterized in that, as the alkaline solution, use 14, 08 17.2 19.3 20.1 169.1 169.8 170.9 172.3 5835956 This is a 2-5% solution of ammonium hydroxide. USSR author's certificate nor. No. 342656, cl. B 01 J 1/22, 1972. Sources of information, No. 172721, CL. From 01 to 33/26, 1965 (protoprinnye into account during the examination of the type). 2. USSR author's certificate