SU525469A1 - Method for the recovery of palladium from spent alumina-based catalysts - Google Patents

Description

4O - 60% end, T1zat Pulg1: adi, The content of palladium in the solution of sodium chloride does not exceed 2.5 mg / l. The yield of insoluble residue (concentrate) is 2.6-4.4% of the original, the precipitate is easily from made from alkaline solution by settling and filtering,

Under production conditions, the process is carried out in a known resistance furnace, equipped with a mechanism for intercepting the charge and a mixture mixer. This device is easy to manufacture and operate, it does not require special anti-corrosion coatings, is durable and can be made of stainless steel.

steel or ferrous metal. From a sodium alumina solution containing 10O-120g / alumina and 12O-140 g / l free silk, a hydrate of oxide can be recovered in a known manner suitable for the preparation of the catalyst.

Indicators of regeneration and palladium from spent catalyst APK-2

without the addition of a reducing agent in the process of specimen leaching

This solution can also be used in the aluminum industry, for example, in the process of regeneration of cryolite. From the concentrate, palladium is recovered in pure form directly from the refining without additional enrichment.

Example 1. Regeneration of palladium from spent alumo-palladium (APC-2), A mixture consisting of 50 g of the spent catalyst crushed to 1 mm and 12O g of alkali in the form of a solution containing 350 g / l O is placed in the form of a solution containing 350 g / l O, and subjected to sintering muffle laboratory furnace at a temperature of 35 ° C and move within one hour.

The cake is leached with water at a ratio to a solid: liquid of 1: 6 at a temperature of 80 ° C for 20 minutes.

The experimental data are given in table. one

Table 1

The data given in table. 1, show that, along with a good bcd-centering of palladium, it is observed to pass into an aluminate solution in the amount of 3.9% of the initial one, which is undesirable under production conditions,

Example 2, Palladium Regeneration

from the spent catalyst APC-2, the conditions of the experiment are the same as in example 501, but in the process of leaching the cake, add -. flax sodium formate in the form of a 5% solution in the amount of 100 ml „

The experimental data are given in table. 2

Indicators of regenerative palladium from spent catalyst APK-2

with the addition of a reducing agent in romesse vazdelachaaanz sdeka

Data, ggov1vedennge table. 2, shows the treated alumo-palladium catalysis, VHCHyut, 1TO addition of the odds, of the shaft in the processor (CNG). The conditions are the same

se aselachivan & guardianship of B as restored by Jfo and in Example 2

Vitel allows SW & OTE d MENU. Cetehol as solid flakes, palladium in aluminate pacraopij.

Example 3, regeneration palpad of the experimental data are given in table. 3

lloEaaaresH regenerator 13 and shshshsh KZ short-lived 1 4; atalnzator with the addition of 30% alkali

 hard scales

Nakmenaanaye materials

CNG catalyst Konaekgrat Kalladi

Solution a; 1 ml of sodium

The data given in Table 3 shows that the addition of 30% alkali from cohum in the form of solid scales makes it possible to achieve the maximum concentration of palladium in the insoluble residue from the leached cake.

The proposed method to be applied to the regeneration of all metal pletyn I)

table 2

That blitz 3

groups contained in spent alumina based catalysts, in particular, palladium from spent alumo palladium catalysts, which are currently not processed and stored as waste in many petrochemical and chemical industries. Claim 1, A method for extracting palladium from spent alumina-based catalysts, including treating a crushed catalyst with an alkali, such as caustic soda, and a reducing agent, followed by filtering the precipitate, characterized in that, in order to simplify the process, reduce the consumption of alkali and increase the palladium concentration The settled catalyst is sintered with caustic soda in a ratio of 1: 2-2.5 - at a temperature of 350 "4OO ° C, followed by leaching of guardianship with soda at the atmosphere; the result of a restorer. 2. Method according to claim 1, characterized in that, in order to intensify the process, 30-40 weight% of caustic soda are taken in the form of solid bistes of 3-5 mm in size, and the rest in the form of an aqueous solution containing ZOO-450 g / LY O. 3. A method according to claim 1, characterized in that formaldehyde or sodium formate is taken as a reducing agent in the form of a 5% solution in an amount of 100150 ml per 1 liter of aluminate sodium.