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Process for recovering non-ferrous metals from industrial mineral residues

A non-ferrous metal and residue technology, applied in the direction of improving process efficiency, can solve the problems of high Fe dissolution rate, difficulty in Zn recovery, etc., and achieve the effect of environmental friendliness and cost avoidance

Pending Publication Date: 2020-12-22
威妥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It follows from the above prior art that in order to achieve high recovery of valuable metals from these residues, aggressive conditions such as acidic leaching agents need to be used, which may lead to undesirably high Fe dissolution rates
Furthermore, goethite residues and fine-grained waste streams from the steelmaking industry often contain Zn as a stable Zn-ferrite (ZnFe 2 o 4 ) spinel, which makes selective Zn recovery difficult

Method used

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  • Process for recovering non-ferrous metals from industrial mineral residues
  • Process for recovering non-ferrous metals from industrial mineral residues
  • Process for recovering non-ferrous metals from industrial mineral residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Mixture Ratio

[0040] The starting materials goethite and jarosite sludge with the chemical composition listed in Table 1 were mixed together in different weight ratios (1:1, 1:2, 1:3 and 1:4), and Sulfated roasting.

[0041] Table 1: Chemical composition of starting goethite and jarosite sludge (dried at 40 °C for 24 h)

[0042]

[0043] Calcination was performed by heating the mixture to 700°C at a rate of 120°C / h at atmospheric pressure in an open reactor (ie, a reactor open to the outside atmosphere). After 1 hour at 700°C, the samples were cooled and ground manually in a mortar and pestle to break up aggregates formed during firing. The chemical composition of the mixture obtained after sulfation roasting is listed in Table 2.

[0044] Table 2 Chemical composition of tested goethite-jarosite mixtures after calcination at 700°C

[0045]

[0046] These mixtures after sulphation roasting were leached in water for selective leaching of Zn. Water ...

Embodiment 2

[0053] Example 2: Post-processing steps

[0054] The solid residue as obtained from Example 1 can be further processed by a selective leaching step, eg to remove Pb and As. A suitable flowchart is in image 3 shown in , especially for a mixture of goethite and jarosite in a ratio of 1:4. The mixing, roasting and water leaching steps are the same as in Example 1 above.

[0055] A first filtration step 40 is performed after water leaching to separate the leachate 41 , which is a zinc-rich solution, from the zinc-depleted solid material 42 . The leachate contained 5 g / L Zn, 0.5 g / L Ca and less than 3 ppm Fe and less than 4 ppm Pb.

[0056] A subsequent leaching step 50 is performed on the solid material 42 . The solid material 42 was leached in a salt solution of 300 g / L NaCl at L / S=10 at 25° C. for two hours. The leach suspension 51 from the leaching step 50 is fed to a filtration step 60 to separate a Pb-rich leachate 61 and a Pb-depleted solid residue 62 . The leachate 6...

Embodiment 3

[0058] Embodiment 3: the influence of roasting temperature on pollutant leaching

[0059] Using jarosite as the sulphur-containing residue, it has been found that this material will bind toxic elements like arsenic and prevent their leaching into leach solutions containing ferrous metals like zinc. For example, arsenic is typically known as arsenate (AsO 4 3-) in waste streams. During roasting, it will partially replace the jarosite structure Pb 0.5 Fe 3 (SO 4 ) 2 (OH) 6 SO in 4 2- . as from Figure 4 It is clear from the diagram that roasting can influence the (further) incorporation of such pollutants in the residue structure in a positive manner. Firing temperature can be an important parameter. refer to Figure 4 , at roasting temperatures starting from about 675°C, there was no detectable leaching of arsenic into the leachate from water leaching after roasting of pure jarosite residues (all process conditions identical to Example 2).

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Abstract

Process for recovering non-ferrous metals from industrial mineral residues Process for recovering a non-ferrous metal from a first solid residue (11) comprising iron. The first solid residue (11) is mixed (10) with a second solid residue (12) comprising sulphur thereby obtaining a particulate mixture (13). The particulate mixture is subjected to a roasting (20) step at a temperature of at least 650 DEG C to obtain a roasted mixture (21), and the roasted mixture is subjected to leaching (30) in a liquid (31) at a pH of at least 5.5 to obtain a solution (41) enriched with the non-ferrous metal.

Description

technical field [0001] The present invention relates to a method for recovering valuable non-ferrous metals from residues originating from metallurgical processes such as hydrometallurgical processes and pyrometallurgical processes. Background technique [0002] Metallurgical processing of zinc generates large hazardous waste streams. In particular, iron is present as an undesired constituent of zinc concentrates, calcined oxides and zinc oxide dust. During leaching of concentrate, calcined product or dust, iron dissolves into solution with zinc and other desired metals. Iron constitutes a dangerous impurity in zinc solutions and must be removed prior to zinc electrolysis. In most existing electrolytic zinc plants, iron is removed by its precipitation as jarosite or goethite, and the jarosite method is more widely used than the goethite method. Due to the presence of heavy metals (e.g. As, Cd, Pb, Zn), these hazardous waste streams are currently disposed of in dedicated l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B7/02C22B19/20C22B19/30
CPCC22B1/02C22B7/006C22B7/02C22B19/20C22B19/30Y02P10/20C22B3/06C22B19/02C22B19/22
Inventor 弗朗齐歇克·库库鲁吉亚利斯贝特·霍克曼斯耶罗恩·斯波伦
Owner 威妥有限公司
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