Recovery process for palladium in alkaline palladium liquid

An alkaline and technological technology, applied in the field of palladium recovery technology in alkaline palladium liquid, can solve the problems of cumbersome palladium recovery process, low quality of palladium recovery, low recovery rate of palladium, etc., to facilitate industrial operation, improve economic benefits of enterprises, The effect of reducing production costs

Inactive Publication Date: 2016-11-09
KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a palladium recovery process in alkaline palladium solution, which can solve the problems of cumbersome palladium recovery process, low palladium recovery rate and low palladium recovery quality in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A palladium recovery process in an alkaline palladium liquid, comprising the following steps:

[0022] A, oxidation: in basic palladium liquid, adding the hydrogen peroxide that concentration is 30% forms monoxide system, and this system is warming up to 35 ℃, continues to oxidize 5min, wherein, in basic palladium liquid, the content of palladium is 50g / L;

[0023] b, precipitation: add ammonium chloride and stir in the alkaline palladium liquid after the oxidation treatment in step a, the mass ratio of ammonium chloride and alkaline palladium liquid is 1:5, and be warmed up to 45 ℃, add uninterruptedly simultaneously Hydrogen peroxide, until there is a large amount of precipitation, then reduce the consumption of hydrogen peroxide, and the reduction range of hydrogen peroxide is 10%, until the palladium in the alkaline palladium liquid is completely precipitated;

[0024] c, impurity removal: filter the precipitate obtained in step b, and place it in octylphenol polyox...

Embodiment 2

[0028] A palladium recovery process in an alkaline palladium liquid, comprising the following steps:

[0029] A, oxidation: in the basic palladium liquid, adding the hydrogen peroxide that the concentration is 30% forms an oxidation system, and this system is warming up to 37 ℃, continues to oxidize 10min, wherein, in the basic palladium liquid, the content of palladium is 55g / L;

[0030] b, precipitation: add ammonium chloride and stir in the alkaline palladium liquid after the oxidation treatment in step a, the mass ratio of ammonium chloride and alkaline palladium liquid is 1:8, and be warmed up to 55 ℃, add uninterruptedly simultaneously Hydrogen peroxide, until there is a large amount of precipitation, then reduce the consumption of hydrogen peroxide, and the reduction range of hydrogen peroxide is 15%, until the palladium in the alkaline palladium liquid is completely precipitated;

[0031] c, impurity removal: filter the precipitate obtained in step b, and place it in a...

Embodiment 3

[0035] A palladium recovery process in an alkaline palladium liquid, comprising the following steps:

[0036] A, oxidation: in basic palladium liquid, adding the hydrogen peroxide that concentration is 30% forms monoxide system, and this system is warming up to 40 ℃, continues to oxidize 15min, wherein, in basic palladium liquid, the content of palladium is 65g / L;

[0037] b, precipitation: add ammonium chloride to the alkaline palladium liquid after the oxidation treatment in step a and stir, the mass ratio of ammonium chloride and alkaline palladium liquid is 1:10, and be warmed up to 60 ℃, simultaneously add uninterruptedly Hydrogen peroxide, until there is a large amount of precipitation, then reduce the consumption of hydrogen peroxide, and the reduction range of hydrogen peroxide is 20%, until the palladium in the alkaline palladium liquid is completely precipitated;

[0038] c, impurity removal: filter the precipitate obtained in step b, and place it in octylphenol poly...

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PUM

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Abstract

The invention discloses a recovery process for palladium in alkaline palladium liquid. The recovery process comprises the following steps of a, oxidation, b, deposition, c, purification, d, drying and e, reduction. According to the recovery process for the palladium in the alkaline palladium liquid, pressurizing treatment is added before palladium recovery, so that other precious metal is removed to the greatest extent except the palladium, and the purification rate of the palladium is greatly increased; in addition, an organic matter attached to the surface of the palladium is removed with a washing method in the palladium recovery process; compared with a traditional roasting method, energy consumption is low, and industrial operation is convenient; moreover, the whole palladium recovery process is simple, the palladium recovery rate reaches up to 99.9%, and the content of other metal elements contained in tail liquid can be controlled; energy-saving emission-reduction environmentally-friendly effects are achieved, the production cost is reduced, and the economic benefits of an enterprise are increased.

Description

technical field [0001] The invention relates to the technical field of palladium recovery, in particular to a palladium recovery process in an alkaline palladium solution. Background technique [0002] As a rare and precious metal, palladium plays the role of catalyst in industrial production, such as plastic electroplating production process, fluoropyrimidine, toluene diisocyanate synthesis, terephthalic acid hydrorefining, etc., all use palladium as a catalyst. Since palladium is a precious metal with scarce resources and high price, it is of great significance to recover organic waste palladium from deactivated catalysts. At present, the method for recovering palladium generally adopts a roasting method, which is complicated in operation, requires high process conditions, consumes large energy, and the existing palladium recovery rate is not high and the quality is relatively low. [0003] Therefore, in order to solve the above-mentioned problems, the present invention p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B7/001C22B7/006C22B11/021C22B11/042Y02P10/20
Inventor 徐涛张奎
Owner KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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