Method for separating palladium from waste water by double-arm bonding-type alicyclic crownether silicon resin

A silicone resin, alicyclic technology, applied in the field of selective adsorption and separation of precious metal palladium

Active Publication Date: 2013-01-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some of these methods are limited by long adsorption time and low separation efficiency, and some are difficult to be widely applied due to high processing costs and technical difficulties.

Method used

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  • Method for separating palladium from waste water by double-arm bonding-type alicyclic crownether silicon resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the enrichment of palladium ion in single palladium-containing solution

[0020] Take 5 mL of a single feed solution containing metal palladium ions (the concentration of palladium ions is 500 ppm, a neutral aqueous solution without nitric acid) in a glass test tube with a stopper, and add 0.6 g; Place the test tube on a constant temperature shaker at 28°C, shake for 50 minutes, and use a microporous membrane to separate the two-arm bonded alicyclic crown ether silicone resin and the feed solution containing metal palladium ions; Spectrometer (ICP-AES) was used to measure the remaining concentration of palladium ions in the water phase, and the calculated removal rate of palladium was 98.6%; the separated double-arm bonded alicyclic crown ether silicone resin was washed with 0.2 mol / L nitric acid solution The adsorbed palladium ions are removed, washed repeatedly with deionized water three times, and dried in an oven to obtain a regenerated double-arm bond...

Embodiment 2

[0021] Embodiment 2: the recovery of palladium in palladium, nickel electroplating rinsing waste water

[0022] Measure 20 mL of electroplating rinsing wastewater into a glass container with a stopper; the wastewater contains 7 ppm of palladium, 10 ppm of nickel, and impurities such as complexing agent ammonia; weigh 0.8 g was added to the above solution; the whole device was placed in a constant temperature shaker at 23°C and shaken for 50 minutes, and filtered through a microporous membrane to separate the double-arm bonded alicyclic crown ether silicone resin and electroplating wastewater; through inductive coupling Plasma emission spectrometer (ICP-AES) measured the remaining concentration of palladium ions in the water phase, and the removal rate of palladium ions was calculated to be 95.9%; the recovered double-arm bonded alicyclic crown ether silicone resin was used with 0.04 mol / L Elution with nitric acid solution to remove the adsorbed palladium ions, then repeated wa...

Embodiment 3

[0023] Example 3: Recovery of palladium in simulated high-level radioactive waste liquid of power pile

[0024] The simulated power pile high-level radioactive waste liquid is prepared according to the theoretical calculation value, containing 14 elements such as Ba, Cd, Fe, Mo, Na, Nd, Ni, Pd, Rb, Ru, Sr, Zr, Cs, Cr; the prepared solution After proper pretreatment, the concentration of palladium ions in it is 50 ppm; measure 10 mL of the above simulated feed solution into a stoppered glass test tube, add 0.1 g of double-arm bonded alicyclic crown ether silicone resin; place the test tube at 25 °C In a constant temperature water bath, after electromagnetic stirring for 40 min, a microporous filter membrane was used to separate the two-arm bonded alicyclic crown ether silicone resin and the metal simulated liquid; the remaining concentration of palladium ions in the liquid phase was measured by ICP-AES, and calculated The removal rate of the obtained palladium ion was 96.4%; th...

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Abstract

The invention discloses a method for separating precious metal palladium through selective adsorption from palladium-containing waste liquid by using double-arm bonding-type alicyclic crownether silicon resin, and belongs to the technical field of heavy metal ion separation. The method comprises the following steps: firstly adding double-arm bonding-type alicyclic crownether silicon resin into palladium-containing waste liquid according to a ratio of 0.01-1.0 of the weight of the double-arm bonding-type alicyclic crownether silicon resin to the volume of the palladium-containing waste liquid, then stirring or oscillating at a temperature of 5-50 DEG C for 20-300 min; filtering and separating the solid phase from the liquid phase, determining the residual concentration of palladium ions in the liquid phase, comparing with an initial concentration to calculate the separation recovery rate; eluting the double-arm bonding-type alicyclic crownether silicon resin with a nitric acid solution of 0.01-3 mol / L, repeatedly washing with deionized water, drying to obtain regenerated resin. The method provided by the invention is high in separation speed for palladium ions in the palladium-containing waste liquid, high in separation efficiency, strong in adaptability, recyclable in materials, and low in cost.

Description

technical field [0001] The invention belongs to the technical field of precious metal recovery, and in particular relates to a method for selectively adsorbing and separating precious metal palladium from palladium-containing waste liquid by using double-arm bonded alicyclic crown ether silicone resin. Background technique [0002] Palladium is one of the noble metals with excellent physical and chemical properties, such as high melting point, corrosion resistance and extraordinary catalytic performance. With the development of society, the application range of palladium is getting wider and wider. It plays a vital role in ordinary life and advanced industrial fields, such as jewelry and accessories, electronics, telephone lines, heat resistance and corrosion resistance. Equipment, palladium is used in large quantities in the isotope treatment process of hydrogen; in the oxidation reaction of methane, the palladium catalyst has the highest activity; in addition, as the mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C22B7/00C22B11/00C02F101/20
CPCY02P10/20
Inventor 叶钢白飞飞韦继超王建晨陈靖
Owner TSINGHUA UNIV
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