Method of recovering Pd from low-concentration waste Pd ion liquid with becteria thallus

A technology of bacterial concentration and low concentration, which is applied in the direction of recycling materials and improving process efficiency, can solve the problems of uneconomical, cumbersome process, secondary pollution, etc., and achieve the effect of low cost and simple method

Inactive Publication Date: 2003-01-01
XIAMEN UNIV
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AI Technical Summary

Problems solved by technology

The process of these methods is loaded down with trivial details and easily causes secondary pollution, especially w

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Combine the dead cell solution of R08 with a cell concentration of 1.2g / L and the initial concentration of Pd with a concentration of 200mg / L 2+ Mix the solution, adjust the pH to 3.5, shake the mixed solution at an oscillation frequency of 130 times / min at 30°C for 45 minutes, and then filter the Pd with a filter membrane with a pore size of 0.22 mm 2+ -Bacterial fluid will adsorb Pd 2+ The bacterium was placed at room temperature for 24h, and finally palladium metal was recovered after burning at 600°C. After determination and analysis, the effect of R08 bacteria on Pd 2+ The adsorption capacity can reach 149.0mg / g bacteria, and the adsorption rate is 89.4%.

Embodiment 2～9

[0015] In Pd 2+ The initial concentration is 200mg / L, the cell concentration is 0.8g / L, pH3.0 and 25℃, the adsorption time is different, and the adsorption time is determined to adsorb Pd on the cell. 2+ Impact. Other operations are the same as in Example 1, and the results are as follows:

[0016] Example Time (min) Adsorption capacity (mg / g) Adsorption rate (%)

[0017] 2 3 139.4 58.1

[0018] 3 8 147.4 61.4

[0019] 4 11 152.2 63.4

[0020] 5 15 156.3 65.1

[0021] 6 30 164.1 68.4

[0022] 7 45 177.1 70.8

[0023] 8 60 175.2 70.1

[0024] 9 90 176.5 70.6

Embodiment 10～13

[0026] PdCl 2 The solution is adjusted to different pH values, in the Pd 2+ The initial concentration is 100mg / L, the bacterial concentration is 0.8g / L and 25℃, the adsorption is 45min, and the bacteria's effect on Pd is determined. 2+ The adsorption rate and adsorption capacity. Others are the same as in Example 1. Pb will be adsorbed 2+ After filtering the bacteria, the metal palladium can be recovered by burning at 550°C for 3 hours after standing for 18 hours. The results are as follows:

[0027] Example pH value Adsorption capacity (mg / g) Adsorption rate (%)

[0028] 10 1.0 58.8 47.0

[0029] 11 2.0 87.9 70.3

[0030] 12 3.0 107.3 85.8

[0031] 13 3.5 116.5 93.2

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Abstract

The present invention relates to the recovery of micro amount of noble metal and the used bacteria is lichenoid bacillus No.R08. R08 bacillus thallus solution of 0.4-2.0 g/L concentration and water solution of Pd ion of 30-300 mg/L are first mixed and vibrated at 5-60 deg.c pH 2.0-3.5 and 130 Hz vibration frequency for 3-90 min; the mixed liquid is then filtered; and filtered Pd adsorbing bacillus thallus is set at room temperature for 6-48 hr and burned at 550-800 deg.c for 1.5-3 hr to obtain metal Pd. The simple process is especially suitable for recovering Pd from low concentration solution and the Pd ion adsorbing rate may reach 99%.

Description

(1) Technical field [0001] The invention relates to a method for recovering trace precious metals. (2) Background technology [0002] Palladium and other precious metals are indispensable and important raw materials in industrial production such as national defense, chemical industry, petroleum refining and electronics. With the development of industrial technology, the application of precious metals has become more and more extensive. However, precious metals such as palladium are scarce and rare. Therefore, all countries attach great importance to the recycling of precious metals. At present, methods for recovering precious metals such as palladium from solution include activated carbon adsorption, ion exchange, chemical precipitation, electrolysis, and solvent extraction. The process of these methods is cumbersome and easily causes secondary pollution, especially when the content of precious metal ions in the solution is low, it is uneconomical to use the above-mentioned recov...

Claims

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Application Information

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IPC IPC(8): C22B3/18
CPCY02P10/234Y02P10/20
Inventor 刘月英傅锦坤姚炳新林种玉古萍英
Owner XIAMEN UNIV
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