US 12,735,768 B2Granted

Method for recovering noble metals from catalytic converter

AssigneeNational Ilan University

InventorsChang-Tang Chang, Yi-Ta Wang, Lian-Wei Li

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Abstract

A method for recovering noble metals from a catalytic converter comprises the following steps: (a) obtaining a catalytic converter, wherein the components of the catalytic converter comprise noble metals and base metals; (b) carrying out high-temperature treatment on the catalytic converter to remove carbon-containing substances in the catalytic converter; (c) breaking the catalytic converter to obtain powder to be treated; (d) dissolving noble metals and base metals in liquid; (e) reacting and depositing the liquid to obtain a gold-containing precipitate; (f) reacting and depositing the filtrate (I) to obtain a platinum-containing precipitate; (g) reacting and depositing the filtrate (II) to obtain a base-metal-containing precipitate; (h) reacting and depositing the filtrate (III) to obtain a palladium-containing precipitate; and (i) reacting and depositing the filtrate (IV) to obtain rhodium-containing metal precipitate. Steps (e) to (i) are performed in sequence.

Claims9

Dependent claims

A method for recovering noble metals from a catalytic converter, comprising:

(a) obtaining a catalytic converter, wherein the components of the catalytic converter comprise noble metals and base metals;
(b) performing a high-temperature treatment on the catalytic converter to remove carbon-containing substances in the catalytic converter;
(c) breaking the catalytic converter to obtain a powder to be treated;
(d) extracting the powder to be treated in liquid phase to make the noble metals and the base metals dissolve in a liquid;
(e) reacting and depositing the liquid to obtain a gold-containing precipitate, wherein step (e) comprises following steps in sequence:
(e-1) adding metal hydroxide into the liquid to adjust the pH value of the liquid to 1-2;
(e-2) adding sodium sulfite into the liquid;
(e-3) standing the liquid to form a gold-containing precipitate;
and
(e-4) filtering the liquid to obtain a filtrate (I);
(f) reacting and depositing the filtrate (I) to obtain a platinum-containing precipitate, wherein the step (f) comprises following steps in sequence:
(f-1) adding hydrogen peroxide into the filtrate (I);
(f-2) adding potassium chloride into the filtrate (I);
(f-3) standing the filtrate (I) to form a platinum-containing precipitate;
and
(f-4) filtering the filtrate (I) to obtain filtrate (II);
(g) reacting and depositing the filtrate (II) to obtain a base-metal-containing precipitate, wherein the step (g) comprises following steps in sequence:
(g-1) adding NH4OH into the filtrate (II) to adjust the pH value of the filtrate (II) to 11;
(g-2) standing the filtrate (II) to form the base-metal-containing precipitate;
and
(g-3) filtering the filtrate (II) to obtain filtrate (III);
(h) reacting and depositing the filtrate (III) to obtain a palladium-containing metal precipitate, wherein the step (h) comprises following steps in sequence:
(h-1) adding HCl to the filtrate (III) to adjust the pH value of the filtrate (III) to less than 2;
(h-2) standing the filtrate (III) to form a palladium-containing precipitate;
and
(h-3) filtering the filtrate (III) to obtain a filtrate (IV);
and
(i) reacting and depositing the filtrate (IV) to obtain a rhodium-containing metal precipitate, wherein the step (i) comprises following steps in sequence:
(i-1) repeatedly flowing the filtrate (IV) through Zn powder;
(i-2) standing the filtrate (IV) to form a rhodium-containing precipitate;
and
(i-3) filtering the filtrate (IV) to obtain a filtrate (V),
wherein the step (e) to step (i) are performed in sequence.

30 more elements

A method for recovering noble metals from a catalytic converter, comprising:

(a) obtaining a catalytic converter, wherein the components of the catalytic converter comprise noble metals and base metals, wherein the noble metals comprise gold, platinum, palladium and rhodium, and the base metals comprise iron and aluminum;
(b) performing a high-temperature treatment on the catalytic converter to remove carbon-containing substances in the catalytic converter;
(c) breaking the catalytic converter to obtain a powder to be treated;
(d) extracting the powder to be treated in liquid phase to make the noble metals and the base metals dissolve in a liquid;
(e) reacting and depositing the liquid to obtain a gold-containing precipitate, wherein the step (e) comprises following steps in sequence:
(e-1) adding sodium hydroxide to the liquid to adjust the pH value of the liquid to 1-2;
(e-2) adding sodium sulfite into the liquid;
(e-3) standing the liquid to form a gold-containing precipitate;
(e-4) filtering the liquid to obtain a filtrate (I);
and
(e-5) concentrating the filtrate (I) under reduced pressure;
(f) reacting and depositing the filtrate (I) to obtain a platinum-containing precipitate, wherein the step (f) comprises following steps in sequence:
(f-1) adding hydrogen peroxide into the filtrate (I);
(f-2) adding potassium chloride into the filtrate (I);
(f-3) standing the filtrate (I) to form a platinum-containing precipitate, wherein the platinum-containing precipitate comprises K2PtCl6;
and
(f-4) filtering the filtrate (I) to obtain a filtrate (II);
(g) reacting and depositing the filtrate (II) to obtain a base-metal-containing precipitate, wherein the step (g) comprises following steps in sequence:
(g-1) adding NH4OH into the filtrate (II) to adjust the pH value of the filtrate (II) to 11;
(g-2) standing the filtrate (II) to form a base-metal-containing precipitate, wherein the base-metal-containing precipitate comprises iron and aluminum;
and
(g-3) filtering the filtrate (II) to obtain a filtrate (III);
(h) reacting and depositing the filtrate (III) to obtain a palladium-containing metal precipitate, wherein the step (h) comprises following steps in sequence:
(h-1) adding HCl to the filtrate (III) to adjust the pH value of the filtrate (III) to less than 2;
(h-2) standing the filtrate (III) to form a palladium-containing precipitate, wherein the palladium-containing precipitate comprises PdCl2(NH3)2;
and
(h-3) filtering the filtrate (III) to obtain a filtrate (IV), wherein the filtrate (IV) contains HRhCl4;
and
(i) reacting and depositing the filtrate (IV) to obtain a rhodium-containing metal precipitate, wherein the step (I) comprises following steps in sequence:
(i-1) repeatedly flowing the filtrate (IV) through Zn powder;
(i-2) standing the filtrate (IV) to form a rhodium-containing precipitate;
and
(i-3) filtering the filtrate (IV) to obtain a filtrate (V),
wherein the step (e) to step (i) are performed in sequence.

31 more elements

Dependencies are inferred from the claim text.