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Preparation method of indium electrolyte solution

A preparation method and electrolyte technology, applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of long time, unqualified products, high indium impurity content, etc., and achieve long service life, small indium loss, and residual impurities low effect

Inactive Publication Date: 2013-02-27
ZHUZHOU KENENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fact that the impurity elements contained in the anode such as Cd, Sn, Tl, Pb, etc. are easy to accumulate in the electrolyte during the electrolysis of thick indium, resulting in a high content of indium impurities precipitated from the cathode during electrolysis, resulting in unqualified products
The existing electrolyte formula is mainly to add sodium chloride and gelatin to improve the conductivity of the solution, and at the same time prevent the short circuit caused by the precipitation of indium at the cathode. If it is enriched in the liquid, a new electrolyte solution needs to be prepared, and the preparation of a new electrolyte solution takes a long time and is expensive

Method used

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  • Preparation method of indium electrolyte solution

Examples

Experimental program
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Effect test

example 1

[0026] Add 5kg of refined indium with a purity of 99.99% plus 6.4kg (3.5L) of concentrated sulfuric acid with a purity of analytical grade, then add 46.5kg of pure water, heat in a container (titanium tank) at 60°C and stir with a glass rod to dissolve the indium Finally, the initial electrolyte solution with a concentration of 100g / L was obtained; then, the initial electrolyte solution obtained in step A was adjusted to pH 1.5 with 99.99% solid sodium hydroxide (NaOH) solution, and then 99.99% solid sodium chloride was added in sequence 5kg, 25g of 99% solid gelatin, and 20g of 99.99% solid thiourea were dissolved to obtain the final indium electrolyte, and the pure water was pure water with a conductivity of 18.25 MΩ / cm.

example 2

[0028] Add 10kg of refined indium with a purity of 99.99% to 12.8kg (7L) of concentrated sulfuric acid with a purity of analytical grade, then add 93kg of pure water, heat and dissolve in the container at 80°C, and obtain an initial electrolyte solution with a concentration of 100g / L Then, adjust the pH value to 2 with the initial electrolyte solution that step A obtains, then add solid sodium chloride 10kg, gelatin 50g, solid thiourea 40g successively, after dissolving, obtain final electrolyte , and the rest are the same as Example 1.

example 3

[0030] Add 20kg of refined indium with a purity of 99.99% to 25.6kg (14L) of concentrated sulfuric acid with a purity of analytical grade, then add 186kg of pure water, heat and dissolve in the container at 95°C, and obtain an initial electrolyte solution with a concentration of 100g / L Then, adjust the pH value to 3.5 with the initial electrolytic solution that step A obtains, then add solid sodium chloride 20kg, gelatin 100g, solid thiourea 40g successively, after dissolving, obtain final electrolytic solution , and the rest are the same as Example 1.

[0031] Sodium oxide, gelatin, and sulfuric acid are all produced by Shanghai Sinopharm Group and are of superior grade; refined indium is produced by the company itself and extracted from crude indium.

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Abstract

The invention discloses a preparation method of an indium electrolyte solution. The purpose of the invention is to provide the preparation method of the indium electrolyte solution. The preparation method is characterized by comprising the following steps: A, mixing indium, sulfuric acid and purified water in a solution generation tank according to the weight ratio of 1 to 1.28 to 9.3, heating at the temperature of 60-95 DEG C, stirring by using a glass rod, and dissolving fine indium to obtain an initial indium electrolyte solution; and B, adjusting the pH value of the initial indium electrolyte solution obtained in the step A to be 1.5-3.5 by using solid sodium hydroxide, adding solid sodium chloride, gelatin and solid sulfourea in sequence, and dissolving to prepare the final indium electrolyte solution. The purity of the fine indium is 99.99%. The purities of the sulfuric acid, the sodium hydroxide, the sodium chloride and the sulfourea are analytically pure or above. The electric conductivity of the purified water is 18.25 megohm / cm. The preparation method is mainly used for preparing the indium electrode solution for producing an organic light emitting oxide (OLED).

Description

technical field [0001] The invention relates to a method for preparing an indium electrolyte, in particular to a method for preparing an indium electrolyte for an organic light-emitting diode (OLED). Background technique [0002] Indium can be called the "vitamin of alloy". Indium alloy can be used as brazing material. Indium is a new important additive element of lead-free solder. The development trend of lead-free solder in the world is conducive to the application of indium brazing material. Utilizing the low melting point of indium alloy, it can also be made into a special alloy, which is used in the circuit breaker protection device of the fire protection system and the thermal control device of the automatic control system; the bearing alloy made by adding a small amount of indium is 4 to 5 times the service life of the general bearing alloy; Indium alloys can also be used in dental medicine, anti-corrosion decorative parts of steel and non-ferrous metals, and plastic ...

Claims

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Application Information

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IPC IPC(8): C25C1/22
CPCY02P10/20
Inventor 赵科湘
Owner ZHUZHOU KENENG NEW MATERIAL CO LTD
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