Method for recovering rare precious metals from solution

A technology of rare precious metals and precious metals, which is applied in the field of recycling and utilization of solution resources containing rare metals, can solve the problems of large loss, large amount of zinc powder, loss of selenium and tellurium, etc., and achieves strong adaptability to changes, significant economic and environmental benefits, low cost effect

Active Publication Date: 2010-12-29
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

However, the content of platinum and palladium in the platinum palladium concentrate obtained by the zinc powder replacement method is low, and the loss of p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Table 1 Solution composition before and after reaction

[0017] element

Se / g L -1

Te / g·L -1

Pt / ppm

Pd / ppm

before reaction

1.60

1.74

6

46

after reaction

0.0085

0.0061

0

0

[0018] Table 2 Rare and precious metal slag composition / %

[0019] element

Se

Te

Pt

PD

Element

43.21

48.24

0.086

0.623

[0020] Use 20mL with a concentration of 3 mol·L -1 Sodium sulfite solution leached the above-mentioned rare and precious metal slag, stirred and reacted at 85°C for 3 hours, filtered to obtain selenium-containing liquid and selenium-separated slag, and the selenium leaching rate reached 92.12%. Using Na 2 SO 3 Adding sulfuric acid to the selenium-containing solution obtained by leaching rare precious metal slag from the solution to make the pH of the solution to 1, heating at 50° C., and then filtering to obtain selenium slag.

[0021] The selenium separa...

Embodiment 2

[0024] Table 3 Solution composition before and after reaction

[0025] element

[0026] Table 4 Rare and precious metal slag composition / %

[0027] element

[0028] With 100mL concentration of 3 mol L -1 Sodium sulfite solution leached the above-mentioned rare and precious metal slag, stirred and reacted at 85°C for 4 hours, filtered to obtain selenium-containing liquid and selenium-separated slag, and the selenium leaching rate reached 93.71%. Using Na 2 SO 3 Sulfuric acid is added to the selenium-containing solution obtained by leaching rare precious metal slag from the solution to make the pH of the solution to 2, and the selenium slag is obtained by filtering after heating at 50°C.

[0029] Use sulfuric acid and hydrogen peroxide solution to leach the selenium separation slag. The amount of hydrogen peroxide is 15mL, the concentration of sulfuric acid is 6mol / L, and the reaction is stirred at room temperature for 2 hours. The tellurium leaching rate ...

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PUM

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Abstract

The invention relates to a method for recovering rare precious metals from a solution, which recovers the rare precious metals from the solution by adopting an SO2 direct-reduction process. The method comprises the following steps of: regulating the acidity of the solution containing the rare precious metals, adding a compound containing chloridions, introducing SO2 to react for a certain time under a heating condition, and then filtering to obtain rare precious metal slag; lixiviating the rare precious metal slag by using a Na2SO3 solution, and filtering to obtain separated selenium slag and a solution containing selenium; adding sulfuric acid to the solution containing the selenium, heating, and then filtering to obtain selenium slag; lixiviating the separated selenium slag by using a mixed solution of the sulfuric acid and hydrogen peroxide, and filtering to obtain precious metal concentrates and a solution containing tellurium; adding the compound containing the chloridions to the solution containing the tellurium, introducing SO2 for reduction, and filtering to obtain tellurium powder. The invention recovers the rare precious metals contained in the solution through the reduction by using the SO2; and in addition, compared with a zinc powder reduction method, the method has the advantages of simplicity, easy operation, low cost and high comprehensive utility ratio.

Description

technical field [0001] The invention relates to a solution resource recycling technology containing rare precious metals, which realizes the recovery of rare precious metals from the solution. Background technique [0002] Selenium (Se) and tellurium (Te) are both rare elements. Selenium is a solid with metallic luster, which can conduct electricity and heat, and its conductivity can change sharply with the intensity of light. The chemical properties of selenium are similar to that of sulfur, but its metallicity is stronger than that of sulfur. The most remarkable property of selenium is its photoelectric effect, which can be used in photovoltaic cells; in addition, it is also used in metallurgy, glass, rubber industry and other fields. Tellurium is a silver-gray semi-metal with high resistivity, a diamagnetic metal, and a good semiconductor material. The chemical properties of tellurium are similar to selenium, the difference is that tellurium hardly interacts with hydro...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C01B19/00
CPCY02P10/20
Inventor 郑雅杰陈昆昆
Owner CENT SOUTH UNIV
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