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A process for treating copper, mercury, selenium, lead and gold and silver in lead filter cake of copper smelting

A treatment process and lead filter cake technology, which is applied in the field of raw material recovery, can solve the problem that the comprehensive treatment plan has not been publicly reported, and achieve the effects of being suitable for large-scale industrial application, strong chemical stability, and clear treatment process steps.

Active Publication Date: 2021-01-22
YANGGU XIANGGUANG COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The method of lead filter cake focuses on the separation of mercury and selenium, but there is no public report on the comprehensive treatment scheme for materials containing copper, mercury, selenium, lead and gold and silver

Method used

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  • A process for treating copper, mercury, selenium, lead and gold and silver in lead filter cake of copper smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) Decopper removal by high pressure leaching

[0052] Take 5t of lead filter cake, main components: Cu 14%, Se 26%, Hg 11%, As 1%, Pb 9%, Au 45g / t, Ag1220g / t, moisture 20%. First configure 20m in the reaction vessel 3 Dilute sulfuric acid solution, wherein the concentration of sulfuric acid is 220g / L. After starting the stirring, add the lead filter cake and 95kg of catalyst iron powder at the same time. After stirring for half an hour, pump it to the autoclave. After the prepreg mixture enters the autoclave, heat it up to 70°C, then introduce oxygen, and the pressure in the reactor gradually increases. When the pressure reaches 0.8MPa, stop the oxygen flow, and keep the pressure for 8 hours. Filter with a filter press for solid-liquid separation, wash the filter cake with water and blow air, the solid is 2.1t of oxidized leaching residue, and the liquid is 20.5m of copper sulfate oxidized leaching solution 3 ;Working conditions of the above process: Oxygen flow rate...

Embodiment 2

[0063] 1) Decopper removal by high pressure leaching

[0064] Take 3.5t of lead filter cake, main components: Cu 30%, Se 45%, Hg 9%, As 1%, Pb 15%, Au 22g / t, Ag 1350g / t, moisture 25%; 16m 3 Dilute sulfuric acid solution, in which the concentration of sulfuric acid is 240g / L. After starting the stirring, add the lead filter cake and 82kg of catalyst iron powder at the same time. After stirring for half an hour, pump it to the autoclave to obtain the pre-soaked mixture; the pre-soaked mixture enters the autoclave Afterwards, heat up to 70°C first, and then introduce oxygen, and the pressure in the reactor gradually increases. When the pressure reaches 1MPa, stop the oxygen flow, and keep the pressure for 8 hours. After the reaction is over, release the pressure to normal pressure, and discharge to Buffer tank, pump to filter press for filtration, solid-liquid separation, filter cake washing and blowing, to obtain solid oxidation leaching residue 1.65t and liquid copper sulfate ...

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Abstract

The invention provides a treatment process of copper, mercury, selenium, lead, gold and silver in a copper smelting lead filter cake. The process mainly comprises following steps of low-temperature high-pressure oxidizing leaching of copper, normal-pressure oxidizing leaching and removal of mercury, replacement of selenium and vulcanization mercury sediment and further comprises rare precious system treatment and electrodeposition copper removal treatment. The treatment process is thorough in copper, mercury, selenium, lead, gold and silver separating effect, the gold, silver and selenium arebasically and completely enriched in the slag phase, the copper recycling rate is about 96%, the leaching rate of mercury is above 90%, and the aim of comprehensively treating valuable elements is achieved.

Description

technical field [0001] The invention relates to the technical field of raw material recovery, in particular to a process for treating copper, mercury, selenium, lead and gold and silver in a copper smelting lead filter cake. Background technique [0002] During the washing process of copper smelting flue gas, some solid particles insoluble in dilute acid will be produced, which are generally called lead filter cake. The lead filter cake is black solid, the main components include copper, selenium, lead, and a small amount of gold and silver; at the same time, due to the complicated sources of copper smelting raw materials, some mercury-containing lead filter cakes will be produced during the production process, and the mercury-containing lead filter cake is mainly Composition: Cu 10-50%, Se 10-70%, Pb 1-20%, Hg 5-20%, Au 5-60g / t, Ag 100-2000g / t. Due to the complex composition of the lead filter cake, the mercury, selenium and lead in it are extremely harmful to the environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C01B19/02C22B11/00C25C1/12C22B43/00
CPCC01B19/02C22B7/007C22B11/042C22B13/045C22B43/00C25C1/12Y02P10/20
Inventor 陈一恒董广刚刘士祥魏栋李先和
Owner YANGGU XIANGGUANG COPPER
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