SU402511A1 - METHOD OF OBTAINING FLUORINE ALUMINUM - Google Patents

Description

one

The invention relates to the field of producing aluminum fluoride, in particular to the field of obtaining aluminum fluoride from an aqueous solution of hydrofluoric acid, obtained, for example, as a waste in the production of phosphate fertilizers from natural phosphates.

A known method for producing aluminum fluoride from an aqueous solution of hydrofluoric acid, obtained as a waste from the production of phosphate fertilizers and containing, as a rule, 110-140 g / l H2SiFe and about 0.5% PaOs. This solution is treated with aluminum hydroxide at a temperature of 25-95 ° C. The ratio of reagents is kept within such limits that the excess acid in the reaction mixture is 105-110% of the stoichiometric required for interaction with aluminum hydroxide. At the end of the reaction, the silica gel is separated from the solution.

Then stop; Alkaline fluoride is crystallized from rastpore.

An essential method of known method is .11.po1. (Agglomeration of fluorine-silicon dioxide. The content of cremation dioxide in the product reaches 0.4U- 0.45%.

For the purpose of the product MJicioTin of the product according to the proposed method, R w. Spur solution

hydrofluoric hydrochloric acid is introduced silica gel in the amount of 6-30% (in terms of silicon dioxide) to the weight of fluorosilicate in the solution being treated. ,

A portion of the gel released from the reaction mixture after treatment with aluminum hydroxide can be used to add hydrofluoric acid to the initial solution.

When producing aluminum fluoride according to the proposed method, the duration of treatment of the initial solution with aluminum hydroxide is 10 - I5 minutes. The silica gel, formed at this stage, is separated by filtration, for example, on a vacuum filter with a lavapopon cloth, and washed with water. A portion of the optic gel (OHPG) () gel was injected into the original paciBop, cream 1epporiopodo 1 (. 1dnoy acid, Contains diphoxide K1) cm (1i in the dried fluoride iyumchine by nrc1 1 bag 0.15 - 0,), t. and 2 - 3 jj.nn lower than the n. nespopomu method.

Example. In D) 0 () carried. h, p nciiiii ui kromnsft () rstvodov (.) p) dp (1G; kis.Yu s, s; and |) F; 11n G (1 12% l-ij. and 0.48% R .. (. ) g, nip; i11 ir-ICMHOratura 50 yg. h. kl krsmpskps.types, but popeyppy pa ps.chpk-s i puyupk-m; iii; i.ioiHiIOM CEC.Y. 3. And On 1 11 And .I. And CMCCi, 111 .-) dt 62 bp Part 1Pd | N10kps11 Alu.mini (Spdsr3

Living A1 (OH) s - 98%). The reaction mixture is heated to a temperature of 95 ° C and maintained at this temperature for 15 minutes. Then the precipitated silica gel is filtered on a vacuum filter with a mylar cloth.

Depression at (|) iltratsii 400 mm Hg. Art., the filter cake is washed with 150 wt. h. heated to 60 ° C water.

After separation of the phases, 175 wt. h. wet sediment gel cre | {neysloty and 580 wt. including a solution of aluminum fluoride. containing 11.5% A1Rz. The content of compound creme, present in this solution in colloidal state, is 480 mg / l of solution (in terms of SiOa). This solution is heated to 85-95 ° C and three-aqueous aluminum fluoride is crystallized from it, and the beam is 00 wt. including wet sediment and 400 weight. including mother liquor containing 4.4% A1Rz, 80

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vbs. water is lost by evaporation. The wet sediment is dried iri 100 ° C, and then calcined at a temperature of 6 ° C, obtaining 52 weight. including aluminum fluoride containing O, 7% dioxide cream.

Pepedmet and.h.

The method of producing aluminum fluoride from an aqueous solution of fluorofluoride Dorodilic acid by treating this solution with aluminum hydroxide followed by separating the silica acid gel from the solution and crystallizing the three-fluoro aluminum fluoride 1k, in order to increase the purity of the product, the silica acid aqueous solution the amount of 6-30% in terms of creme dioxide by weight of hydrofluoric acid in the solution being treated.