RU1527917C - Method of extracting platinum metals from industrial solutions with complex salt composition - Google Patents

Description

(46) 05/23/93. Bull. Number 19

(21) A31436V02.

(22) 08.10.87

(71) Siberian State Design and Research Institute of Non-Ferrous Metallurgy and Institute of Geochemistry and Analytical Chemistry

them. . Vernadsky

(72) F.I. Danilova, V.P. Kirillova, I.I. Antokolsk, D.T. Koshmanov, G.B. M soedova, V.V. Sorokin

and A.M. Efremov

(56) Abstracts of the XIII All-Union Chernivtsi Conference on Chemistry, Analysis and Technology of Platinum Metals, vol. II. UC AN USSR, 1986, p. 51-52.

USSR copyright certificate f 1297584, cl. G 01 N 1/28, 1984. „

(54) METHOD FOR EXTRACTING PLATINUM METALS FROM INDUSTRIAL SOLUTIONS OF COMPLEX SALT COMPOSITION (57) The invention relates to hydrome

Tallurgy of platinum metals. The purpose of the invention is to reduce the loss of platinum metals. When platinum metals are extracted from industrial solutions of complex salt composition, for example, from autoclave solutions containing carbonyl and formate complexes, or from solutions after the first cementation of platinum metals containing non-ferrous metals and iron, the initial solutions are subjected to electrochemical activation in a cell with a distance between electrodes 6-10 mm. Then, platinum metals are sorbed from the resulting solution on a sorbent located above the electrodes. Extraction is carried out continuously with periodically varying polarity of the electrodes using a polymer material filled with P-ORGS-X1H N-vinylbenzimidazole anion exchanger as a sorbent. As a result, losses of platinum metals with waste solutions are reduced by 30-60%. 4 tab.

§ SL

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ke

4

The invention relates to the hydrometallurgy of platinum metals and can be used to extract their residuals from solutions of refining production after their restoration, for example, with sodium formate, metal powders of iron, zinc, nickel, etc.

The purpose of the invention is to reduce the loss of platinum metals.

The invention is practiced in a subtle way.

When implementing the method, a cell made of chemically resistant material, for example plexiglass, titanium, etc., with electrodes installed in parallel, was used. The cell has an upper drain and lower nozzles and a cassette in which the sorbent is located.

An industrial solution is fed into the electrochemical cell through the lower pipe until the electrodes are completely immersed in it. After that they turn on evil

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CRITICAL CURRENT (current density at electrodes approximately 0.003 L / cm), switching of cathode-anode modes is carried out through a standard relay relay switched to the PCR iiepeicnroce 20 Co Continue uninterrupted supply of P1yumrastpor at a speed of 150 dm / h (with a volume of 3 in solution , 6 dm). The selected solution of C (enters the sorbent (for example, POPN-ORGS-X1H) located above the electrodes, and after passing the sorbent-T layer. I am selected for control. The residual co-concentration of discharge pacT - J5 thieves was monitored by the method (co-centering of platinum metals with thiourea),

Extraction of platinum metallocides using this method was carried out from 20 PROFILENCES 1) GC autoclave solutions containing formatted and carbonyl com plexes and mother liquors .POD after the first cementation. Platinum metals were extracted in 25 cells with different distances between the electrodes and at different locations of the sorbent research institute. The results obtained are presented in the 1st year of the table. 1 -, Control. for the emission of platinum metals -jn is carried out by their residual concentration of 3 solution and by their content on the sorbent,

Facilitate the sorption-electrochemical extraction of platinum metals; I O, 003. L / cm, the switching frequency of the cathode-aiodic rivers is 20 s, the number of electrodes is 625, cm, the volume of the working chamber is 3.6 ht-. Sorbent Q is located in the electrochemical cell between the electrodes (similar to the prototype),

As in from table. 1, with a decrease in the distance between the electrodes, more complete extraction of the pin metals from the solutions proceeds. However, even at a distance of 6 mm, solutions discharged over platinum metals cannot be obtained with a sorbent located between the electrodes.

Further further reduction of the distance between the electrodes is impractical, since a very thin layer of sorbent will be located on the electrode, which will be quickly worked out, which will lead to the need for its frequent replacement. In the table. 2 cite) 1st results of sorption-electrochemical extraction of pla

9

 (

n

i- Q

with

0

174

typical metals with different locations of the sorbent relative to the electrodes.

h.,

As you can see ne tab. 2, the maximum recovery of platinum metals can be achieved by the proposed method with a distance between the electrodes 6-10 I-IM and the location of the sorbent above the electrodes. After burning the sorbent, concentrates containing 85 - 91% of noble metals were obtained (Table 3).

Example. A cassette filled with a sorbent is installed above the electrodes of the electrochemical cell. An industrial solution with a content of platinum metals of 50-500 mg / dm is supplied to the lower branch pipe of the electrochemical cell until the electrodes are completely covered by the solution and an electric current is switched on through the rectifier. The current density at the electrodes is set to approximately 0.003 L / cm. Continue to feed the reactor into the electrochemical cell at a speed of approximately 150 dm / h with a working volume of the electrode part of the electrochemical cell of approximately 3.6. Lactated solution passes through a layer of sorbent located in the upper part of the cell, and flows through the upper nozzle and receiver. As a sorbent, for example, 110LIORGS-X1H, which has high kinetic properties, can be used.

In the table. And comparative data on the content of platinum metals in the concentrate and waste solutions (according to the prototype and the proposed method) are given.

Thus, the location of the sorbent above the electrodes and the distance between them of 6–10 mm make it possible to obtain the maximum extraction of platinum metals from industrial solutions with their minimum content in waste waters. The proposed method allows to reduce the loss of platinum metals with waste solutions by 30-60% and to obtain a concentrate containing 85-91% of noble metals, including 50-78% platinum, while the prototype receive a concentrate containing 28-50% platinum metals.

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Claims (1)

The claims Method for attracting platinum metals From industrial solutions of complex salt composition, mainly from autoclave solutions containing formate and carbonyl complexes, and solutions after the first cementation of platinum metals containing jg non-ferrous metals and iron, including electrochemical activation from time to time -T t The content of platinum metals in the waste solutions, depending on the distance between the electrodes when the sorbent is located between electrodes a significantly varying polarity of electrons: genera and the subsequent adsorbed platinum metals on a polymer material filled with N-vinylbenenenemyl ash anion exchange resin, 111 and so that, in order to reduce the loss of platinum metals, activation of the wire t at a distance between the electrodes of 6-10 mm and sorption is carried out on the sorbent when it is placed above the electrodes. The first mother after the first treatment, pH 1-2 Autoclave, pH 3 (initial)  Cell with a sorbent located between the electrodes. 51cell with a sorbent located above the electrodes. Table 4 The content of platinum metals in concentrate and prefabricated solutions A method of obtaining a centrate of platinum metals The total content of output metals, mg / DM in the non-concentrates Continuation of Table 2 T a-b ... l and f a b waste solutions