Method for adsorbing and separating palladium, platinum and rhodium through copolymer of aniline and 2-amino-6-methoxybenzoic acid

A methoxybenzoic acid, adsorption and separation technology, applied in the field of precious metal metallurgy, can solve the problems of small adsorption capacity of chemical grafted adsorbent, no industrial-scale application, low adsorbent selectivity, etc., and achieves low cost and high efficiency. It is beneficial to industrial enlargement and the effect of less corrosiveness of equipment

Inactive Publication Date: 2017-12-19
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impregnated extraction resin and biosorbent have poor stability, the selectivity of activated carbon and metal nanomaterial adsorbent is not high, and the adsorption capacity of chemical grafted adsorbent is small.
Therefore, the separation of platinum, palladium and rhodium by adsorption method has not yet been applied on an industrial scale in China.

Method used

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  • Method for adsorbing and separating palladium, platinum and rhodium through copolymer of aniline and 2-amino-6-methoxybenzoic acid
  • Method for adsorbing and separating palladium, platinum and rhodium through copolymer of aniline and 2-amino-6-methoxybenzoic acid
  • Method for adsorbing and separating palladium, platinum and rhodium through copolymer of aniline and 2-amino-6-methoxybenzoic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 1.0g AN / MBA as the stationary phase, add it to 0.1mol / L C(HCl), 100mL Pd(II) solution with a concentration of 20g / L, shake for 15min, filter out the loaded AN / MBA; measure Pd For adsorption capacity, add the filtered AN / MBA loaded with Pd into 100mL 0.3mol / L thiourea solution, shake for 15min, filter out the AN / MBA in the desorption solution, wash the AN / MBA twice with distilled water, and adsorb again For the same Pd(II) solution, measure the maximum static adsorption capacity value for six cycles.

[0040] Advantage of the present invention, can find out from above-mentioned experiment, the measurement result of six cycles maximum static adsorption capacity is as shown in table 1:

[0041] Table 1. Determination of the maximum static adsorption capacity of Pd(II) six cycles

[0042] Cycles

[0043] It can be seen from Table 1 that after 6 cycles of use, the maximum static adsorption capacity of AN / MBA to Pd(II) has not decreased significantly, and th...

Embodiment 2

[0045] Weigh 1.0g AN / MBA as the stationary phase, add it to 0.1mol / L C(HCl) and 100mL Pt(IV) solution with a concentration of 10.0g / L, shake for 15min, filter out the loaded AN / MBA; measure Pt adsorption capacity, add the filtered Pt-loaded AN / MBA to 100mL pure water, shake for 10min, filter out the AN / MBA in the desorption solution, and absorb the same Pt(IV) solution again, and measure the maximum static state of 6 cycles Adsorption capacity value.

[0046] Advantage of the present invention, can find out from above-mentioned experiment, the measurement result of six cycles maximum static adsorption capacity is as shown in table 2:

[0047] Table 2. Determination of the maximum static adsorption capacity of Pt(IV) six cycles

[0048] Cycles

[0049] It can be seen from Table 2 that after six cycles of use, the maximum static adsorption capacity of AN / MBA to Pt(IV) has not decreased significantly, and the adsorption of AN / MBA to Pt(IV) has high stability and can b...

Embodiment 3

[0051] 1. Weigh 1.0g AN / MBA as stationary phase and add it to 0.1mol / L C(HCl) containing Pd, Pt and Rh in 100mL mixed material liquid. The content of Pd, Pt and Rh in the mixed material liquid Both were 10mg / L, shaken for 10min, and the loaded AN / MBA was filtered out; the contents of Pd, Pt and Rh in the filtrate were measured, and the recovery rate of Rh was calculated (see Table 3 for specific data).

[0052] 2. Add the AN / MBA loaded with Pd and Pt filtered out into 100mL pure water, shake for 5min, and filter out the AN / MBA in the desorption solution. Measure the content of Pd and Pt in the desorption solution, and calculate the recovery rate of Pt (see Table 3 for specific data).

[0053] 3. Add the AN / MBA desorbed with Pt into 100mL 0.1mol / L thiourea solution, shake for 10min, and filter out the AN / MBA in the desorbed solution. Determination of the content of Pd in ​​the desorption liquid, calculate the recovery rate of Pd (see Table 3 for specific data).

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Abstract

The invention discloses a method for adsorbing and separating palladium, platinum and rhodium through a copolymer of aniline and 2-amino-6-methoxybenzoic acid (short for AN / MBA) and belongs to the technical field of platinum group metal separation. According to the method, the AN / MBA serves as an adsorption agent; the Pt and the Pd in a hydrochloric acid medium with the concentration being 0.1 mol / L are jointly adsorbed according to the solid-to-liquid ratio of 1: 100 (g / mL), and the Rh is reserved as a water phase; and then, pure water and a thiourea solution are adopted as a Pt elution agent and a Pd elution agent correspondingly, and step-by-step elution is conducted on the adsorbed Pt and Pd through a two-step elution method. By means of the method, the Pd, the Pt and the Rh can be separated; the method is simple in operation procedure, high in adsorption capacity and environmentally friendly; the recycling rate of the Pt can be 97.0% or above, the recycling rate of the Pd is higher than 96.0%, and the recycling rate of the Rh is higher than 95.0%; and the AN / MBA adsorption agent is good in stability and can be reused.

Description

technical field [0001] The invention relates to a new method for adsorbing and separating palladium, platinum and rhodium with a copolymer of aniline and 2-amino-6-methoxybenzoic acid (abbreviated as AN / MBA), belonging to the field of precious metal metallurgy. Background technique [0002] Platinum group metals are strategic materials necessary for modern industry, national defense industry, new energy development and environmental pollution control. Platinum group metal resources are one of the most scarce strategic resources in the world. In my country, platinum group metals are mainly used in the automobile industry, and the exhausted automobile catalyst has become the most important secondary resource of platinum group metals in China. A large amount of platinum group metals accumulated in the automobile industry is called "moving platinum group metal mines". However, my country's platinum group metal resources are very scarce, so the country attaches great importance to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/24
CPCC22B3/24C22B11/04Y02P10/20
Inventor 黄章杰钟丽江张琴蒋绍松张金燕陈慕涵吴胜杰
Owner YUNNAN UNIV
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