Method for separating and recovering rare and precious metals in chlorination leaching liquid

A technology for chlorination leaching and rare and precious metals, applied in the direction of improving process efficiency, can solve the problems of high cost, low recovery rate, poor separation effect, etc., and achieve the effects of good adaptability, short process and low cost

Active Publication Date: 2016-07-20

JIANGXI COPPER CORP

6 Cites 28 Cited by

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Problems solved by technology

All the methods described in the above patents have many defects such as lengthy process...

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Abstract

The invention discloses a method for separating and recovering rare and precious metals in chlorination leaching liquid. The chlorination leaching liquid of complex rare and precious metal materials is used as stock solution; a substance containing no heavy metal elements is used as a reducing agent; and the stock solution is selectively reduced through controlling potential to convert the rare and precious metals therein to simple substances step by step for precipitating to form various rare and precious concentrates, so that the rare and precious metals in the stock solution are effectively separated and recovered, selenium tellurium concentrates are obtained, and the purpose of separating and recovering the rare and precious metals in the chlorination leaching liquid is achieved. The method is short in flow, low in cost, easy to operate, high in adaptability, capable of treating various complex chlorination leaching liquid, excellent in separating effect of the rare and precious metals in the chlorination leaching liquid and high in recovery rate.

Application Domain

Process efficiency improvement

Technology Topic

Heavy metalsPrecious metal +5

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Examples

Experimental program(3)

Example Embodiment

[0015] Example 1

[0016] Accurately measure 3.00L of chlorinated leaching solution and pour it into an acid-resistant reactor, stir and adjust the solution to acidity, add a sodium sulfite solution with a concentration of 100g/L to the reaction solution at a rate of 50mL/min at room temperature, and monitor with a potentiometer The potential of the reaction solution, when the solution potential reaches

[0017] Stop at 750mV. Solid-liquid separation to obtain gold concentrate and liquid after primary reduction. The volume, composition and precipitation rate of each element of the solution before and after the reaction are shown in Table 1. The gold concentrate was washed with water and hydrochloric acid, dried, and sent to the main metal grade analysis and impurity content analysis. The results are shown in Table 2.

[0018] Table 1 Elemental analysis results before and after primary reduction of chlorinated leachate

[0019]

[0020] Table 2 Analysis results of main metal and impurity content of fine gold ore

[0021]

[0022]

[0023] Pour the solution after primary reduction into the acid-resistant reactor, stir and heat up to 70°C, then add sodium bisulfite solution with a concentration of 75g/L at a rate of 10mL/min, and monitor the potential of the reaction solution with a potentiometer, when Stop when the potential reaches 580mV, and carry out solid-liquid separation after cooling to obtain platinum palladium concentrate and liquid after secondary reduction. The volume, composition and element precipitation rate of the solution before and after the reaction are shown in Table 3. The platinum palladium concentrate was sent for solid composition analysis after drying, and the results are shown in Table 4.

[0024] Table 3 Elemental analysis results before and after the second reduction of the liquid after the first reduction

[0025]

[0026] The element composition analysis result of table 4 platinum palladium concentrate

[0027] the element

[0028] Pour the secondary reduction solution into the acid-resistant reactor, stir and heat up to 80°C, then add sodium metabisulfite solution with a concentration of 300g/L at a rate of 80mL/min, and monitor the potential of the reaction solution with a potentiometer, when the potential Stop when it reaches 175mV, and carry out solid-liquid separation after cooling to obtain selenium tellurium concentrate and liquid after three reductions. The volume, composition and element precipitation rate of the solution before and after the reaction are shown in Table 5. The selenium tellurium concentrate was sent for solid composition analysis after drying, and the results are shown in Table 6.

[0029] Table 5 Elemental analysis results before and after the third reduction of the liquid after the second reduction

[0030]

[0031] Table 6 Elemental composition analysis results of selenium tellurium concentrate

[0032] the element

Example Embodiment

[0033] Example 2

[0034] Accurately measure 3.00L of chlorinated leaching solution and pour it into an acid-resistant reactor, stir and adjust the solution to acidity, heat to 40°C and feed SO at a flow rate of 40mL/min 2 Gas, and monitor the potential of the reaction solution with a potentiometer, stop when the potential of the solution reaches 690mV, and then separate the solid and liquid to obtain the gold concentrate and the liquid after primary reduction. The volume, composition and element precipitation rate of the solution before and after the reaction are shown in Table 7. The gold concentrate was washed with water and hydrochloric acid, dried, and sent to the main metal grade analysis and impurity content analysis. The results are shown in Table 8.

[0035] Table 7 Elemental analysis results before and after primary reduction of chlorinated leachate

[0036]

[0037]

[0038] Table 8 Analysis results of main metal and impurity content of fine gold ore

[0039]

[0040] Pour the first reduction solution into the acid-resistant reactor, stir and heat up to 60°C, then feed SO at a flow rate of 80mL/min 2 gas, and monitor the potential of the reaction liquid with a potentiometer, stop when the potential reaches 520mV, and carry out solid-liquid separation after cooling to obtain platinum palladium concentrate and liquid after secondary reduction. The volume, composition and element precipitation rate of the solution before and after the reaction are shown in Table 9. The platinum palladium concentrate was sent for solid composition analysis after drying, and the results are shown in Table 10.

[0041] Table 9 Elemental analysis results before and after the first reduction of the liquid before and after the second reduction

[0042]

[0043] The element composition analysis result of table 10 platinum palladium concentrate

[0044] the element

[0045] Pour the secondary reduction solution into the acid-resistant reactor, stir and heat up to 75°C, and then feed SO at a flow rate of 180mL/min. 2gas, and use a potentiometer to monitor the potential of the reaction liquid, stop when the potential reaches 110mV, and carry out solid-liquid separation after cooling to obtain selenium tellurium concentrate and liquid after three reductions. The volume, composition and element precipitation rate of the solution before and after the reaction are shown in Table 11. The selenium tellurium concentrate was sent for solid composition analysis after drying, and the results are shown in Table 12.

[0046] Table 11 Elemental analysis results before and after the third reduction of the liquid after the second reduction

[0047]

[0048] Table 12 Elemental composition analysis results of selenium tellurium concentrate

[0049] the element

Example Embodiment

[0050] Example 3

[0051] Accurately measure 3.00L of chlorinated leaching solution and pour it into an acid-resistant reactor, stir and adjust the solution to acidity, add oxalic acid solid to the reaction solution at a rate of 5g/min at room temperature, and monitor the potential of the reaction solution with a potentiometer. Stop when the solution potential reaches 720mV. Solid-liquid separation to obtain gold concentrate and liquid after primary reduction. The volume, composition and precipitation rate of each element of the solution before and after the reaction are shown in Table 13. The gold concentrate was washed with water and hydrochloric acid, dried, and sent to the main metal grade analysis and impurity content analysis. The results are shown in Table 14.

[0052] Table 13 Elemental analysis results before and after primary reduction of chlorinated leachate

[0053]

[0054] Table 14 Analysis results of main metal and impurity content of fine gold ore

[0055]

[0056] Pour the solution after the primary reduction into the acid-resistant reactor, stir and heat up to 50°C, then add the sodium sulfite-oxalic acid mixed solution with a concentration of 200g/mL at a rate of 5mL/min, and monitor the potential of the reaction solution with a potentiometer. Stop when the potential reaches 460mV, and carry out solid-liquid separation after cooling to obtain platinum palladium concentrate and liquid after secondary reduction. The volume, composition and element precipitation rate of the solution before and after the reaction are shown in Table 15. The platinum palladium concentrate was sent for solid composition analysis after drying, and the results are shown in Table 16.

[0057] Table 15 Elemental analysis results before and after the first reduction of the liquid before and after the second reduction

[0058]

[0059] Table 16 Elemental composition analysis results of platinum palladium concentrate

[0060] the element

[0061] Pour the secondary reduction solution into the acid-resistant reactor, stir and heat up to 70°C, and then feed SO at a flow rate of 120mL/min. 2 gas, and use a potentiometer to monitor the potential of the reaction solution, stop when the potential reaches 235mV, and carry out solid-liquid separation after cooling to obtain selenium tellurium concentrate and liquid after three reductions. The volume, composition and element precipitation rate of the solution before and after the reaction are shown in Table 17. The selenium tellurium concentrate was sent for solid composition analysis after drying, and the results are shown in Table 18.

[0062] Table 17 Elemental analysis results before and after the third reduction of the liquid after the second reduction

[0063]

[0064]

[0065] Table 18 Elemental Composition Analysis Results of Selenium Tellurium Concentrate

[0066] the element

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Classification and recommendation of technical efficacy words

Short process
Low cost

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Method for separating and recovering rare and precious metals in chlorination leaching liquid

A technology for chlorination leaching and rare and precious metals, applied in the direction of improving process efficiency, can solve the problems of high cost, low recovery rate, poor separation effect, etc., and achieve the effects of good adaptability, short process and low cost

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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