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Indium extraction method of ferrous iron-rich zinc oxide acid supernatant

A zinc oxide and extraction technology, applied in the direction of improving process efficiency, etc., can solve the problems of discontinuous production in the extraction process, inability to extract, and affect zinc recovery, etc., to reduce the entrainment of chloride ions and other impurity ions, and to maintain continuous operating costs Produce and realize the effect of recycling

Active Publication Date: 2014-04-30
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

Therefore, when conventional extraction is used to extract indium according to the method in the prior art, the organic phase is generally operated for 7 to 10 days, and the organic phase needs to be extracted and washed with sodium hydroxide solution for regeneration, so that the production of the extraction process is discontinuous.
Especially when the mass concentration of ferrous ions reaches 10-50g / L, the organic phase is easy to emulsify, and needs to be saponified in 2-3 days, and even the extraction cannot be carried out at all.
At the same time, because the organic phase entrains the water phase, the indium raffinate contains high chlorine, sometimes as high as 2g / L, which seriously affects the recovery of zinc in the indium raffinate

Method used

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  • Indium extraction method of ferrous iron-rich zinc oxide acid supernatant

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Experimental program
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Effect test

Embodiment 1

[0061] The composition of the zinc oxide supernatant S1 rich in ferrous iron that the present invention adopts is following mass concentration (unit g / L): In 3+ 0.55g, Zn 2+ 91.67 Fe 2+ 48.01, Fe 3+ 0.68, Sn 2+ 0.035, Bi 3+ 0.098, SiO 2 0.18, As 3+ 1.48, Sb 3+ 0.27, H 2 SO 4 87.53, Cl - 0.76.

[0062] Step A: Extraction: Extraction adopts 4-stage continuous extraction, the extracted organic phase is composed of P204 with a volume fraction of 40%, 200# kerosene with a volume fraction of 59%, and TBP with a volume fraction of 1%. The specific extraction conditions are: organic phase and rich The volume ratio of ferrous zinc oxide supernatant S1 is 1:6, the extraction time is 4 minutes, the temperature is 60°C, and the clarification time is 10 minutes; the phases are separated in a clarification tank to obtain an indium-rich organic phase and a raffinate. The raffinate contains 10mg / L of indium and 0.96g / L of chlorine.

[0063] Step B: blank: the blank is a...

Embodiment 2

[0071] The composition of the zinc oxide supernatant S2 that is rich in ferrous iron that the present invention adopts is following mass concentration (unit g / L): In 3+ 0.84g, Zn 2+ 101.65 Fe 2+ 30.58 Fe 3+ 0.72, Sn 2+ 0.031, Bi 3+ 0.076, SiO 2 0.16, As 3+ 1.86, Sb 3+ 0.37, H 2 SO 4 73.51, Cl - 0.71.

[0072] Step A: Extraction: The extraction adopts 5-stage continuous extraction, and the extracted organic phase is composed of P204 with a volume fraction of 30%, 200# kerosene with a volume fraction of 67%, and TBP with a volume fraction of 3%. The specific extraction conditions are: organic phase and rich The volume ratio of ferrous zinc oxide supernatant S2 is 1:4, the extraction time is 7 minutes, the temperature is 40°C, and the clarification time is 8 minutes; the phases are separated in the clarification tank to obtain the indium-rich organic phase and raffinate. The raffinate contains 8.6mg / L of indium and 0.88g / L of chlorine.

[0073] Step B: blan...

Embodiment 3

[0081] The composition of the zinc oxide supernatant S3 that is rich in ferrous iron that the present invention adopts is following mass concentration (unit g / L): In 3+ 0.48g, Zn 2+ 83.42 Fe 2+ 12.57 Fe 3+ 0.61, Sn 2+ 0.034, Bi 3+ 0.086, SiO 2 0.23, As 3+ 1.27, Sb 3+ 0.23, H 2 SO 4 96.17, Cl - 0.67.

[0082] Step A: Extraction: The extraction adopts 6-stage continuous extraction, and the extracted organic phase is composed of P204 with a volume fraction of 20%, sulfonated kerosene with a volume fraction of 78%, and TBP with a volume fraction of 2%. The specific extraction conditions are: organic phase and rich The volume ratio of ferrous zinc oxide supernatant S3 is 1:3, the extraction time is 4 minutes, the temperature is 20°C, and the clarification time is 5 minutes; the phases are separated in a clarification tank to obtain an indium-rich organic phase and a raffinate. The raffinate contains 9.4mg / L indium and 0.82g / L chlorine.

[0083] Step B: blank:...

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Abstract

The invention provides an indium extraction method of ferrous iron-rich zinc oxide acid supernatant. The method comprises the following steps: A, ferrous iron-rich zinc oxide acid supernatant is extracted, and extracted organic phase comprises extraction agent P204, diluting agent and stabilizing agent tributyl phosphate; B, extracted indium-rich organic phase is blanked and further subjected to aqueous phase separation; C, blanked and separated indium-rich organic phase is subjected to reverse extraction; D, lean organic phase subjected to reverse extraction is blanked and further subjected to strip liquor separation; E, the lean organic phase is regenerated; F, the regenerated organic phase is subjected dechlorination; and G, the organic phase subjected to dechlorination is subjected to acid cleaning. The method has the advantages that the direct recovery rate of extracted indium is higher than 98 percent, the direct recovery rate of reverse extracted indium is higher than 99 percent, the recycling of organic phase is realized, the indium recovery flow is simplified, indium loss during processes of zinc powder replacement, enriching residue two-stage leaching and the like is eliminated, the indium recovery ratio is improved, the indium production cost is reduced, and the harm caused by arsenic during zinc powder replacement is eliminated.

Description

technical field [0001] The invention relates to a method for extracting rare and precious metals in a zinc hydrometallurgy process, in particular to a method for comprehensively recovering indium in a zinc hydrometallurgy process. Background technique [0002] In the existing zinc hydrometallurgy process, more than 70% of the world’s lead-zinc smelting enterprises recover indium by adopting the traditional zinc oxide leaching-zinc powder replacement enrichment-enriched slag two-stage leaching-conventional indium extraction process to recover indium . The indium recovery rate of this process is relatively low, and it has the disadvantages of long process, large amount of intermediate slag, high chlorine content in raffinate, and easy generation of toxic gas arsine. It requires a large amount of zinc powder and high production cost. Conventional extraction and indium extraction process The extraction process is divided into three steps: extraction, pickling and stripping, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B58/00C22B3/40
CPCY02P10/20
Inventor 朱北平林文军周正华刘一宁黄勇刘任廖贻鹏
Owner ZHUZHOU SMELTER GRP
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