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A method for improving germanium-rich sub-zinc oxide soot germanium leaching rate

A technology of secondary zinc oxide and leaching rate is applied in the field of improving germanium leaching rate of germanium-rich secondary zinc oxide fume, which can solve the problems of decreased germanium leaching rate, difficulty in recycling germanium, and low leaching rate of germanium that cannot be changed, so as to improve the leaching rate of germanium. , the effect of improving germanium leaching rate

Active Publication Date: 2020-12-01
YUNNAN CHIHONG RESOURCE COMPREHENSIVE UTILIZATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the final acidity is too high, and it is difficult to recover germanium in the leach solution. If neutralization method is used to reduce the acidity of the leach solution, co-precipitation of silicon dioxide and germanium in the solution will occur, and the actual leaching rate of germanium will decrease.
Therefore, this study only confirmed the leaching rate of germanium in dust, and cannot change the current situation of low leaching rate of germanium in industrial production.

Method used

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  • A method for improving germanium-rich sub-zinc oxide soot germanium leaching rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The main components of the germanium-rich zinc oxide dust used in this example are: Zn: 45.39%, Pb: 18.43%, acid-soluble SiO 2 : 2.87%, Ge: 0.0741%.

[0045] (1) Slurry: Take 500g of germanium-rich sub-zinc oxide dust and slurry it with water.

[0046](2) One-stage leaching: Add dilute sulfuric acid to 3 acid addition points with an adjustable flow metering pump until the pH value of the slurry is ≈4.0, and keep the pH value for 0.5 hours to dissolve the zinc.

[0047] (3) Second-stage leaching: continue to add dilute sulfuric acid at 3 points, control the pH value of the pulp ≈ 3.5, and keep the pH value for 0.5 hours to react; the silicate is dissolved, and the silicon dioxide that enters the solution is dissolved at the same time, and then the hydrated silicon protein ( SiO 2 .nH 2 O) Morphological precipitation into slag.

[0048] (4) Three-stage leaching: Continue to add dilute sulfuric acid at 3 points until the pH value of the slurry is ≈3.0, and keep this pH...

Embodiment 2

[0054] The main components of the germanium-rich zinc oxide dust used in this example are: Zn: 49.85%, Pb: 21.09%, acid-soluble SiO 2 : 4.03%, Ge: 0.0956%.

[0055] (1) Slurry: Take 500g of germanium-rich sub-zinc oxide dust and slurry it with water.

[0056] (2) One-stage leaching: Add dilute sulfuric acid to 4 acid addition points with an adjustable flow metering pump until the pH value of the slurry is ≈4.5, and keep the pH value for 1.0h to dissolve the zinc.

[0057] (3) Second-stage leaching: continue to add dilute sulfuric acid at 4 o'clock, control the pH value of the pulp ≈ 4.0, and keep this pH value for 1.0 hours of reaction; the silicate is dissolved, and the silicon dioxide that enters the solution is dissolved at the same time, and then hydrated silicon protein (SiO 2 .nH 2 O) Morphological precipitation into slag.

[0058] (4) Three-stage leaching: Continue to add dilute sulfuric acid at 4 o'clock until the pH value of the slurry is ≈2.5, and keep this pH va...

Embodiment 3

[0064] The main components of the germanium-rich zinc oxide dust used in this example are: Zn: 55.26%, Pb: 13.38%, acid-soluble SiO 2 : 5.31%, Ge: 0.117%.

[0065] (1) Slurry: Take 500g of germanium-rich sub-zinc oxide dust and slurry it with water.

[0066] (2) One-stage leaching: Use an adjustable flow metering pump to add zinc electrolysis waste liquid at 5 acid addition points until the pH value of the slurry is ≈4.0, and keep the pH value for 1.5 hours to dissolve the zinc.

[0067] (3) Second-stage leaching: continue to add zinc electrolytic waste liquid at 5 o'clock, control the pH value of the ore pulp ≈ 3.5, and keep this pH value for 1.5 hours of reaction; the silicate is dissolved, and the silicon dioxide that enters the solution is dissolved at the same time and then hydrated Silicon protein (SiO 2 .nH 2 O) Morphological precipitation into slag.

[0068] (4) Three-stage leaching: continue to add zinc electrolytic waste solution at 5 o'clock until the pH value o...

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Abstract

The invention relates to a method for improving the germanium leaching rate of germanium-rich zinc suboxide smoke dust, and belongs to the technical field of non-ferrous metal wet smelting. The methodmainly comprises five steps of slurrying, first-stage leaching, second-stage leaching, third-stage leaching and filtering, wherein the pH value of the slurry is adjusted and controlled, and zinc, silicate and germanium are selectively leached in sequence, so that the silicate is leached before the germanium, generated orthosilicic acid is precipitated into slag in the form of hydrated silicon protein, and the influence of synchronous dissolution and coprecipitation of the silicate and the germanium on the germanium yield is effectively eliminated; and the germanium and zinc are recovered fromthe filtrate after the leaching ore slurry is subjected to liquid-solid separation. The method solves the technical problem of low germanium leaching rate caused by coprecipitation of silicon and germanium during leaching, and the germanium leaching rate is improved by 15-22%.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal wet smelting, and in particular relates to a method for improving the leaching rate of germanium from germanium-rich sub-zinc oxide dust. Background technique [0002] Germanium is an associated element of zinc concentrate, which is associated with germanium in zinc concentrate. After desulfurization by boiling roasting and zinc calcine leaching by conventional methods, germanium is enriched in acid leaching residue, which is reduced and volatilized by fire method After that, germanium was enriched again in the form of germanium-rich subzinc oxide soot. [0003] At present, the recovery of germanium in germanium-rich sub-zinc oxide fume is industrially applied with sulfuric acid as the leaching medium, and the germanium-rich sub-zinc oxide fume is subjected to two-stage leaching, and the obtained first-stage leachate adopts tannin chelation precipitation method or extraction method to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B19/30C22B41/00C01B33/12
CPCC01B33/12C22B7/007C22B7/02C22B19/30C22B41/00Y02P10/20
Inventor 刘克洋张梅晋家强刘贤陆占清强振华闫建英
Owner YUNNAN CHIHONG RESOURCE COMPREHENSIVE UTILIZATION CO LTD