Method for platinum group metals recovery from spent catalysts

Patent metadata

Field	Value
Publication number	US-2020032370-A1
Application number	US-201916591644-A
Country	US
Kind code	A1
Filing date	Oct 3, 2019
Priority date	Jun 19, 2014
Publication date	Jan 30, 2020
Grant date	—

Abstract

A method for recovery of platinum group metals from a spent catalyst is described. The method includes crushing the spent catalyst to obtain a catalyst particulate material including particles having a predetermined grain size. The method includes subjecting the catalyst particulate material to a chlorinating treatment in the reaction zone at a predetermined temperature for a predetermined time period by putting the catalyst particulate material in contact with the chlorine containing gas. The method also includes applying an electromagnetic field to the chlorine-containing gas in the reaction zone to provide ionization of chlorine; thereby to cause a chemical reaction between platinum group metals and chlorine ions and provide a volatile platinum group metal-containing chloride product in the reaction zone. Following this, the volatile platinum group metal-containing chloride product is cooled to convert the product into solid phase platinum group metal-containing materials.

First claim

What is claimed is:

1 . An apparatus for recovery of platinum group metals from a spent catalyst comprising:
a catalyst particulate material inlet port; a chlorination reactor with a reaction zone; a chlorine-containing gas inlet port; a heater; optionally an electromagnetic inductor; platinum group metal-containing vapor outlet port and one or more corresponding cooling manifolds through which a platinum group metal-containing vapor is released from said reaction zone; wherein a catalyst particulate material is fed into said catalyst particulate material inlet port and is being treated with chlorine containing gas from said chlorination reactor at a predetermined temperature by said heater, providing a chemical reaction between platinum group metals and said chlorine-containing gas to yield a volatile platinum group metal-containing chloride product.

2 . The apparatus of claim 1 , wherein said catalyst particulate material is impregnated with chloride aqueous solution prior to be fed into the apparatus.

3 . The apparatus of claim 2 , wherein said chloride aqueous solution is provided by dissolving at least one chloride salt and at least one hypochlorite salt in water.

4 . The apparatus of claim 3 , wherein a concentration of said at least one chloride salt in said chloride aqueous solution is in the range of about 15 weight percent to about 40 weight percent; and wherein a concentration of said at least one hypochlorite salt is in the range of about 5 weight percent to about 15% weight percent.

5 . The apparatus of claim 3 , wherein said chloride salts are selected from the group consisting of: alkaline metal chlorides, alkaline earth metals chlorides, aluminum chloride and ammonium chloride; and wherein said hypochlorite salts are selected from the group consisting of: hypochlorite salts of alkaline metals and hypochlorite salts of alkaline earth metals.

6 . The apparatus of claim 2 , wherein said impregnating of said catalyst particulate material with said chloride aqueous solution includes soaking said catalyst particulate material in said chloride aqueous solution until said catalyst particulate material is steeped.

7 . The apparatus of claim 1 , wherein said catalyst particulate material includes particles having a predetermined grain size in the range of 100 microns to 300 mm.

8 . The apparatus of claim 1 , wherein an amount of the chlorine in said chlorine containing gas is in the range of 1 gram to 200 gram per each kilogram of said spent catalyst.

9 . The apparatus of claim 1 , wherein said chlorine-containing gas includes chlorine and atmospheric air or oxygen.

10 . The apparatus of claim 1 , wherein said predetermined temperature is in the range of 300 degrees Celsius to 1100 degrees Celsius.

11 . The apparatus of claim 1 , wherein said electromagnetic inductor applies an electromagnetic field to said chlorine-containing gas and catalyst particulate material mixture.

12 . The apparatus of claim 11 , wherein said electromagnetic field is in a frequency in the range of 50 kHz to 12 GHz.

13 . The apparatus of claim 11 , wherein said electromagnetic field is in an irradiance in the range of 0.1 kW/cm 2 to 10 kW/cm 2 .

14 . The apparatus of claim 11 , wherein said application of electromagnetic field is carried out simultaneously with said treatment of said catalyst particulate material with said chlorine containing gas at said predetermined temperature.

15 . The apparatus of claim 1 , wherein said chlorine containing gas is produced by heating a chlorine-containing material, in a chlorine production zone at a decomposition temperature of said chlorine-containing material, thereby causing thermal decomposition of said chlorine-containing material and producing said chlorine-containing gas.

16 . The apparatus of claim 15 , wherein said chlorine-containing material is a particulate material selected from potassium hypochlorite, sodium hypochlorite, calcium hypochlorite, magnesium hypochlorite, barium hypochlorite, potassium chloride-hypochlorite, sodium chloride-hypochlorite, calcium chloride-hypochlorite, magnesium chloride-hypochlorite, barium chloride-hypochlorite, potassium chloride, sodium chloride, ammonium chloride, calcium chloride, magnesium chloride, barium chloride, aluminum chloride, hydrochloric acid and any combination thereof.

17 . The apparatus of claim 15 , wherein said chlorine-containing material is a composition of calcium hypochlorite and calcium chloride.

18 . The apparatus of claim 17 , wherein an amount of calcium hypochlorite in said composition of calcium hypochlorite and calcium chloride is in the range of 5 weight percent to 80 weight percent.

19 . The apparatus of claim 15 , wherein said heating of said chlorine-containing material is carried out at a temperature in the range of 150 degrees Celsius to 400 degrees Celsius.

20 . The apparatus of claim 1 , wherein said chlorine-containing gas is provided from a storage tank.

21 . The apparatus of claim 1 , wherein said electromagnetic inductor comprises electrodes.

22 . The apparatus of claim 21 , wherein said electrodes are arranged inside or outside a housing.

23 . The apparatus of claim 1 , wherein said chlorination reactor comprises a temperature sensor.

24 . The apparatus of claim 1 , further comprising a platinum group metal-containing chloride product collector.

Assignees

• Yeda Res & Dev

Inventors

• Lubomirsky Igor
• Kaplan Valery

Classifications

• B01J19/08

  Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor (application of shock waves B01J3/08) · CPC title

• C22B11/06 Primary

  Chloridising · CPC title

• C22B11/048

  from spent catalysts · CPC title

• C01G55/005

  Halides · CPC title

• Y02P10/214

  Cross-Sectional Technologies · mapped topic