SU1274761A1 - Method of producing sorbent on the base of titanium hydroxide - Google Patents

Abstract

The invention relates to methods for producing a sorbent based on titanium hydroxide and makes it possible to increase the degree of extraction of trace amounts of heavy metals from mineralized solutions by increasing the selectivity of the sorbent and increasing the filtration permeability. The method consists in that hydrated titanium dioxide is mixed with sulfuric acid in the presence of finely divided cellulose at a weight ratio of 1:

Description

j; The invention relates to chemical technology, in particular to methods for producing inorganic sorbents based on titanium dioxide, and can be used in the preparation of high-purity materials, the purification of industrial wastes with the utilization of valuable components, in the food industry. The purpose of the invention is to increase the selectivity in the extraction of trace amounts of heavy metals from mineralized solutions and better kinetic characteristics. Example 1. A mixture of 200 g of an aqueous paste of hydrated titanium dioxide is prepared with an TiOj content (anatase) of 34%, by creeping thermally hydrolysis of a solution of titanium; 68 MP of 5% sulfuric acid, 0.68 g of wood flour with a particle size of 5 µm (1: 0.05: 0.01), are thoroughly mixed, the precipitate is separated and treated with a saturated solution of ammonium carbonate to pH 8, The resulting mixture is held under stirring for 1 hour, then the precipitate is separated, placed in a cold muffle furnace and calcined, held at 400 ° C for 4 hours. The calcined precipitate is cooled and rinsed with water until there is no sulfate ion in the filtrate. Example 2. 200 g of wet hydrated titanium dioxide (GDT) obtained by thermo hydrolysis of a solution of titanium containing 30% water and 6% is mixed with 60 ml of concentrated sulfuric acid (1.83) and sintered in a muffle at 500 ° C for 5 h The resulting sorbent is then subjected to tests while removing heavy metal impurities from the saline solution (2 mol / L sodium chloride solution). The tests were carried out in a dynamic mode with a sorbent layer of 2 mm, a filtering surface of 45.3 cm, a volume of a solution of 250 ml, and a content of heavy metal impurities. In tab. Table 1 shows the results of the sorption and filtration capacity of sorbents and the selectivity of the extraction of trace amounts of heavy metals, fTable1

2 90

Proposed 5 0.5 70 Known 30

The way to get. Base

.

about -10,

100 90

100 O O O

The degree of extraction,%

75

75

100 70

31274761

Example 3. The sorbent according to Example 1 is obtained for obtaining the temperature, the change in the ratio and the ratio of reagents during the synthesis are shown in Table.

.ГДТг.ЗО гдрев flour particle size 5 μm) 1: 0.1: 0.02

GDT: H2804: cellulose (particle size 5 μm) 1: 0.1: 0.02

GDT: H2304:

: acetylcellulose

1: 0.1: 0.01

GDT: H250: methyl cell for 1: 0,, 03

GDT: H2804: trees

,one:

: 0.01

GDT: H2304: trees

,one:

: 0.01

GDT: H2304: Cellkhosa

1: 0.1: 0.01

calcination. Condition the properties of sorbents while2.

table 2

100

100

90

100

100

90

100

100

90

100

100

90

100

100

90

.-five

100

100

90

ten

1.-10100

100

90

The continuation of the table.2.

Claims (2)

Formula invented and 1. A method of producing a sorbent based on titanium hydroxide, comprising mixing crystalline titanium hydroxide with a solution of sulfuric acid and 4S subsequent heat treatment in the presence of ammonium compounds, characterized in that, in order to increase the selectivity of extracting trace amounts of heavy metals from mineralized solutions and improve the kinetic characteristics of the sorbent, the mixture is mixed in the presence of finely divided cellulosic material, and heat treatment is carried out at 350-500 C. 2. The method according to p. 1 .. characterized in that the mass ratio of titanium hydroxide and cellulosic material when mixed is 1: (0.01-0.03).