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Method for producing 4N5 pure indium by electrolyzing high impurity crude indium once

A technology of coarse indium and impurities, applied in the field of metallurgy, can solve the problems of electrolytic product quality decline, electrolyte pollution, product pollution, etc., and achieve the effects of avoiding product pollution, stabilizing electrolytic current, and improving product quality

Inactive Publication Date: 2010-11-24
HULUDAO ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the electrolysis, wash the cathode and precipitates with dilute hydrochloric acid solution and exchanged water until neutral, then put them into heated glycerin and melt them, which can easily cause product contamination
In the original refined indium electrolysis, due to the introduction of anode slime, impurities in the production operation, and external pollution in the air, there will be suspended solids and impurity particles in the electrolyte, which will easily cause electrolyte pollution and make electrolytic products The quality drops, it is difficult to achieve 99.995% purity by one electrolysis, and two electrolysis is generally used to remove impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for producing 4N5 refined indium by primary electrolysis of high-impurity coarse indium comprises the following process steps:

[0022] 1. The anode is made of crude indium. The raw material crude indium mainly contains impurities: Pb≤1.5%, Sn≤1.2%, Zn≤0.5%, Cd≤1.2%, Tl≤1.0%, and the main grade of indium is greater than 95%. The above-mentioned crude indium is subjected to vacuum removal of cadmium, the vacuum distillation temperature is 800-820°C, the time is 12 hours, the vacuum degree is 4 Cl:In=75:1, ZnCl 2 : NH 4 Cl=3:1.

[0023] Scrub the crude indium after removing cadmium and thallium with 5% dilute hydrochloric acid, and wash it with exchange water to make an anode. The anode is wrapped with filter paper, packed in an anode bag, and placed in an electrolytic cell.

[0024] 2. Use 4N5 refined indium to make the cathode of the initial electrode, the cathode of the initial electrode is: 200×580×0.5mm, the cathode of the initial electrode is set in the...

Embodiment 2

[0030] The method for producing 4N5 refined indium by primary electrolysis of high-impurity coarse indium comprises the following process steps:

[0031] 1. The anode is made of crude indium, which mainly contains impurities: Pb≤1.0%, Sn≤0.8%, Zn≤0.1%, Cd≤0.8%, Tl≤0.8%, and the main indium is greater than 97%. Remove cadmium and thallium from the above crude indium by conventional methods, and remove cadmium in vacuum: vacuum distillation temperature 780-800°C, time 10 hours, vacuum degree 4 Cl:In=75:1, ZnCl 2 : NH 4 Cl=3:1.

[0032] Scrub the crude indium after removing cadmium and thallium with 5% dilute hydrochloric acid, wash it with exchange water to make an anode, put it in an anode bag, and set it in an electrolytic cell for standby.

[0033] 2. Use 4N5 refined indium to make the cathode of the starter sheet. The specification of the cathode of the starter sheet is 200×600×1mm. Set the starter sheet in the electrolytic cell with a distance of 30mm from the anode.

[...

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PUM

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Abstract

A method for producing 4N5 pure indium by electrolyzing high impurity crude indium once comprises the steps of preparing crude indium anode, preparing starting sheet cathode and conductive bands, preparing electrolyte according to the process requirement and carrying out electrolysis. An electrolytic bath below the crude indium anode is used for electrolysis. The starting sheet cathode is arranged in the electrolytic bath. The distance between different sheets is 25-30mm. The electrolyte is placed into the electrolytic bath and contains 60-80g / l of indium, NaCl with a concentration of 40-60g / l and gelatin with a concentration of 0.2-0.3g / l and has pH value of 2-2.5. The electrolysis temperature is 20-30 DEG C, the current density is 15-25A / m2 and the bath voltage is 0.12-0.18V. The method can realize producing 4N5 pure indium with purity of 99.995% by electrolyzing high impurity crude indium once. In the invention, the starting sheet manufactured by the 4N5 pure indium is used as the cathode, the electrolytic current is stable, precipitation is uniform and the bath voltage is easier to control precisely. Besides, the 4N5 pure indium is produced by electrolyzing once, thus reducing the intermediate links, avoiding production pollution, greatly improving the quality of the pure indium products and lowering the production cost.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a production method for extracting 4N5 refined indium, which is suitable for electrolytically refining metal indium with a purity of 99.995% refined indium in one-time electrolytic production from high-impurity crude indium materials (mainly high tin and high lead) Purification method. Background technique [0002] As one of the rare metals, indium is widely used in the semiconductor industry, and can also be used as advanced alloy materials. It is also widely used in medical, chemical, glass, and electrical industries. At present, indium metal has become an indispensable and important material for the development of modern science and technology. In recent years, due to the continuous revision of refined indium product standards by the state and the industry, the purity of refined indium products has gradually increased. From the initial revision of 99.99% to 99.993%, and from 99.993% t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/22C25C7/06
CPCY02P10/20
Inventor 李逸郭天立高永学李良武江
Owner HULUDAO ZINC IND CO LTD
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