RU1460901C - Method of extracting iridium from industrial solutions - Google Patents

Abstract

The invention relates to the field of refining production of platinum metals and allows to increase the efficiency of the use of: zoto-chelate-forming sorbents - macroporous copolymers of styrene with vinylbenzene containing benzimidazole groups used for ti3-. drives of iridi from technological solutions. An object of the invention is to enable reuse of the sorbent. For the implementation of the method, the desorption of iridium is carried out with a mixture of hydrochloric and oxalic acids at a molar ratio of 2: 0.2-0.3 per 1 mg of iridium and at a temperature of 90-100 C. The use of an acid mixture for desorption of iridium does not destroy the structure organic sorbent and allows its use for repeated use in the technological field of extraction of iridium with a degree of desorption of 90-91%. A taffeta. With

Description

I

The invention relates to the field of recovering platinum metals, in particular iridium, from industrial solutions containing base metal impurities, for further. recovering valuable components.

The purpose of the invention is to enable reuse of the sorbent,

To carry out the process, iridium adsorbed on a nitrogen-containing sorbent is a styrene-divinylbeneol copolymer containing benzimidazole functional groups, for example, POLIORGS-X1 I, POLIORGS-X1,

they are desorbed with a mixture of oxalic and hydrochloric acids at a molar ratio of 0.2-0.3: 3.8-4.2 per 1 mg of desorbable iridium and at a temperature of 90-100 s.

Extraction of iridium is carried out under laboratory conditions using technological solutions containing iridium and impurities of base metals (copper. Nickel, iron and DR "). Preliminarily investigate the nli -. the concentration of oxalic and hydrochloric acid on the desorption of iridium (2.5 mg of iridium). The data presented in table. 1 show that the most complete desorption is 5fndl

4

Od

about

J

1Q

occurs with a mixture of 0.5-0.6 M oxalic and 9.5-10.5 M hydrochloric acid,

At lower acid concentrations, iridium is desorbed much worse; an increase in acid concentration does not improve the 90% desorption obtained. The influence of the heating temperature of the eluent on the degree of desorption was also studied, and it was found that the desorption temperature, ° С: 20, 50, 70, 90-100, corresponds to the percentage of desorption of iridium 30, 45, 72, 90-91 (an increase in temperature leads to an increase in desorption ) "

Example 1, Technological solution Ш on hydrochloric acid is passed through a layer of sorbent. 1.5-2 cm high (POLIORGS-X1 H-polyacryl. -Nitrile fiber, filled with tone-JQ

1 60901

50-70 cm with a Mixture of 0.53M, 204 JM HCl, which corresponds to the molar ratio of 0.2-0.3 3.8-4.2 mixtures per 1 mg of desorbed iridium indicated in the claims.

With a smaller volume, respectively, f. The desorption of iridium is reduced, and the larger volume does not increase the degree of desorption (desorption was carried out with a mixture of acids in EO-10C).

The effect of the temperature of the eluiruclide solution on the degree of desorption of iridium (2.5 mg irvdi, a solution of 0.55 M NpSdO - - 1-YM HC1, a solution volume of 70 cm) is shown in Table. AND,

Higher heating is impractical since the destruction of oxalic acid begins.

Example 2. Iridi is extracted using a granular sorbent - POLIORGS-X1, preliminarily prepared by passing hydrochloric acid

fifteen

dispersed sorbent) at a rate

100-200 washed 5-6. Times W

hydrochloric acid and 2-3 times with water.

Base metals in these conditions are not sorbed. The sorbent is placed at a rate of 100 g200 rinsing.

yut; In a glass And pour 50-70 cm2 with water, 2-3 times. Pass through the prepared sorbent at the same speed. Technological solution III according to Solic acid. Wash 5-6

0.55 M of oxalic acid in 10 M hydrochloric acid, the beaker is heated in a water bath at 90-1.00 ° C for 15.-20 min, after which the solution is filtered, sorbent Q. Times 1 M HC1, 2-3 times with water, then they are washed .1-2 times with YuM НС1 and З -Д,. iridium is desorbed by heated water. When the mixture is treated with a mixture of up to 90-100 0 with a solution of 0.55 M-H (gC04 + velic and hydrochloric acids, -f- JM HC1 occurs, the sorbent layer is filled with a simultaneous reduction of iridium 50-70 cm of the eluting solution. in the phase of the sorbent and desorption, the desorption stub of iridium is qi iridi, this effect is not observed 38-90.5%. It is obtained by alternating treatment with these same acids. After desorption, the sorbent does not require further processing and can be used for : single extraction and desorption of iridium. The degree of desorption is determined by agomic absorption. or pektro-; mvtricheskgm method - ......

 The results are presented in Thai, 2, from which it follows, x | that.when selected40

Claims (1)

The method can be used in industrial refining enterprises for additional extraction of iridium from technological solutions containing iridium and base metals. Opt allows you to use the sorbent many times, increases its efficiency and reduces the consumption of the sorbent. In addition, the proposed HF method simplifies the process, since as a result of regeneration of the sorbent, ashing and burning of the sorbent when removing iridium from it is excluded, .. Claims  nyh. conditions (Oj55 M oxalic acid: bed in 10 M hydrochloric acid at a temperature of 90-100 0, 87-91% of iridium is desorbed without destroying the sorbent. That is, the sorbent .. can be used repeatedly further desorption and srrbtsvi. Number Influence Results The method can be used in industrial refining enterprises for additional extraction of iridium from technological solutions containing iridium and base metals. Opt allows you to use the sorbent many times, increases its efficiency and reduces the consumption of the sorbent. In addition, the proposed HF method simplifies the process, since as a result of regeneration of the sorbent, ashing and burning of the sorbent when removing iridium from it is excluded, .. Claims fifty A method for the extraction of iridium from industrial solutions, including sorbing an eluirutide of a mixture of acids for desorption, dtsi on a macroporous copolymer of sti, IRIDIA (2.5 mg of iridium), is a roll with divschlbeisole containing. in the table benzimidazole functional groups From the data of the table it follows that for a powder characterized by a desorption of 2.5 mg of iridium, it is sufficient that, in order to provide a Q-factor of 1 M HC1, 2-3 times, then the iridium is desorbed by heating to 90-100 0 with a solution of 0.55 M-H (gCc04 + -f- JM HC1, inlet. Sorbent layer 50-70 cm of elution solution. The degree of desorption of iridium is 38-90.5%. 0 The method can be used in industrial refining enterprises for additional extraction of iridium from technological solutions containing iridium and base metals. Opt allows you to use the sorbent many times, increases its efficiency and reduces the consumption of the sorbent. In addition, the proposed HF method simplifies the process, since as a result of regeneration of the sorbent, ashing and burning of the sorbent when removing iridium from it is excluded, .. Claims fifty repeated use of the sorbent, iridium is desorbed with a mixture of oxalic and hydrochloric acids at their molar trotnogeny per 1 mg sp lpl equal to (0.2-0.3): (З.а--, 2) iridium at a temperature of gO-IOO C. Table Ft table 9 Continuation of the table.