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Method for comprehensively recovering indium and gallium from distilled waste acid containing indium and gallium

A technology of indium gallium and hydrochloric acid, which is applied in photography technology, equipment, photography auxiliary technology, etc., and can solve problems such as waste of valuable metals and pollution of the factory environment

Inactive Publication Date: 2010-06-02
南京中锗科技有限责任公司
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  • Description
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Problems solved by technology

In the past, due to technical problems, the waste acid was only discharged after neutralization treatment, and a large amount of valuable metals in the distillation residue was wasted, and at the same time, a large amount of precipitated residue containing metal ions was produced by neutralization to pollute the environment of the plant

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  • Method for comprehensively recovering indium and gallium from distilled waste acid containing indium and gallium
  • Method for comprehensively recovering indium and gallium from distilled waste acid containing indium and gallium
  • Method for comprehensively recovering indium and gallium from distilled waste acid containing indium and gallium

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described in detail below through specific examples.

[0023] Such as figure 1 As shown, it is a process flow chart of recovering indium gallium from distillation raffinate according to an embodiment of the present invention.

[0024] 1. Recovery of Ga in distillation raffinate

[0025] Considering that the acidity of distillation waste acid is generally >7-8N, the extraction reagent with good extraction performance in high acidity solution is the first choice. Gallium is extracted and recovered from hydrochloric acid solution, and ethyl acetate is selected as a reagent with better separation performance between primary and heterometallic metals.

[0026] 1.1 Extraction mechanism

[0027] In the highly acidic hydrochloric acid solution, the oxygen atoms in the extractant release lone pairs of electrons, protonate to form cations, and Ga generates complex anions GaCl 4 - , the two are exchanged and ass...

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Abstract

The invention discloses a method for comprehensively recovering indium and gallium from distilled waste acid, wherein the process for recovering gallium comprises the following steps of: adopting ethyl acetate as an extracting reagent and adopting kerosene as diluent; extracting at two grades in an intermittent type extracting way, quantitatively supplementing new ethyl acetate every day and maintaining the phase ratio of a water phase and an organic phase to be 2-3:1; extracting and stirring for five minutes; standing, demixing and then discharging extracted residual liquid in a neutralizing pond to carry out the enrichment and recovery of indium; washing and mechanically mixing a loaded organic phase by hydrochloric acid with 4-6N and then reversely extracting by diluted hydrochloric acid with 1-1.5N; standing, demixing and then separating a deficient organic phase from reversely extracted liquid; carrying out neutralized enrichment on the reversely extracted liquid twice to form gallium concentrated ore, washing and removing impurities to obtain high-purity gallium; in addition, the process for recovering indium comprises the following steps of: neutralizing and depositing the gallium extracting residual liquid by liquid alkali; then leaching for three times, extracting indium, purifying, removing impurities, replacing and founding to obtain rough indium with stable quality.

Description

technical field [0001] The invention relates to a method for comprehensively recovering indium gallium from distillation waste acid containing indium gallium with high efficiency. Background technique [0002] In the prior art, when the raw materials containing germanium, indium, gallium and other scattered metals are produced by the method of chlorination distillation, only the germanium is recovered initially, and other valuable metals exist in large quantities in the distillation waste acid. In the past, due to technical problems, the waste acid was only discharged after neutralization treatment, and a large amount of valuable metals in the distillation residue was wasted. At the same time, a large amount of precipitated residue containing metal ions was produced by neutralization to pollute the environment of the plant. In recent years, under the dual requirements of the market and environmental protection, the comprehensive recovery of indium and gallium in this kind of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B58/00C22B3/32C22B3/06C22B7/00C25C1/22
CPCY02P10/20
Inventor 汪洋黄兴灯唐琴
Owner 南京中锗科技有限责任公司
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