Method for recovering valuable metals

A metal and process technology, which is applied in the field of recycling valuable metals, can solve the problems of inability to flotation, difficulties in metal sulfate flotation, weakening of sulfide flotation performance, etc., and achieve the effect of increased yield and easy oxidation

Active Publication Date: 2013-01-09
METSO OUTOTEC (FINLAND) OY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When air is used as the flotation gas in an electrochemical runaway space, the flotation performance of lead and silver sulfides rapidly weakens and flotation cannot occur
Flotation of metal sulfates such as lead sulfate is extremely difficult, which makes recovery of valuable metals more difficult

Method used

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  • Method for recovering valuable metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After strong acid leaching, the sulfidation and flotation of the residue were studied using laboratory tests. In terms of major components, the supplied material has the following composition: Pb 19.3%, Ag 720g / t, Au 2.3g / t. In addition, the material is mainly composed of zinc and iron compounds, gypsum and silicate minerals.

[0031] After strong acid leaching, the residue was sulfided in a closed reactor by using a stoichiometric amount of sulfide relative to lead at a pH of 1.5–3 at a temperature of 50 °C during a period of 3 hours. The sulfide was fed to the slurry as a 2.5M solution.

[0032] After sulfidation, the slurry is subjected to flotation to concentrate lead, silver and lead. The flotation process consists of a coarse flotation stage and four cleaner flotation stages. In Experiment 1, no electrochemical conditioning was applied in the flotation, but it was usually carried out with air as the flotation gas. In the experiments, the pH of the slurry was a...

Embodiment 2

[0034] In Experiment 2, flotation was additionally carried out in the same manner as in Example 1, but in the flotation stage the potential was adjusted to values ​​up to +200 mV vs. SHE using the composition of the flotation gas and adding NaHS solution.

[0035] The yield of lead in the fourth cleaner concentrate is now 87.9%, and the concentration in the concentrate is 56.2%. For silver, the corresponding readings were: 90.6% yield and 2160g / t. The gold yield was 77.5% and its content in the concentrate was 5.8g / t.

[0036] This example shows that by adjusting the slurry potential in the flotation stage to an appropriate range, detrimental oxidation of sulfide minerals can be prevented, while, however, maintaining such electrochemical conditions favors flotation. Depending on the collector chemistry and its content, the redox potential for a pH range of 2 to 4 is typically -50 to +350 mV versus SHE.

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Abstract

A method for recovering valuable metals, such as lead, silver and gold from the residue of an electrolytic zinc process, wherein the residue from the zinc process is suspended and sulfidized for converting the lead and silver compounds into sulfidic form, and further flotated for forming a flotation concentrate that contains valuable metals, wherein the sulfidizing and flotation processes are controlled electrochemically, so that the content of the sulfide ions fed in the sulfidizing stage is adjusted by means of the redox potential to a level where the grain size of the created valuable metal sulfides is sufficient for flotating them, and that the redox potential of the flotation stage is adjusted to be within a range where the collector chemical is adhered to the mineral to be flotated, but the sulfides are not oxidized.

Description

field of invention [0001] The present invention relates to a process for the recovery of valuable metals such as lead, silver and gold from the residues of the electrolytic zinc process. Background of the invention [0002] In addition to zinc, zinc concentrates also contain other valuable metals such as lead, silver and gold, and recovery of these metals is of significant importance when looking at the zinc process in general. The behavior of these elements must be considered when making process changes. When electrolytically producing zinc metal from zinc sulfide concentrates, the concentrate is first fully or partially roasted, wherein the zinc sulfide of the concentrate is oxidized to oxides, since zinc oxide is more easily leached than sulfides. Most of the zinc oxide is leached into the zinc sulfide in the neutral leaching stage. During roasting, part of the concentrate forms zinc-containing ferrites, leaching of ferrites requires a higher acid content than leaching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02C22B7/00C22B11/00C22B13/00
CPCC22B11/042C22B7/006B03D2203/025C22B13/045B03D1/02Y02P10/20C22B7/00C22B11/04C22B11/00C22B13/00
Inventor J·莱皮宁
Owner METSO OUTOTEC (FINLAND) OY
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