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Method and device for preparing indium sulfate

A technology of indium sulfate and concentrated sulfuric acid, which is applied in chemical instruments and methods, gallium/indium/thallium compounds, inorganic chemistry, etc., can solve the problem that the quality of metal anode plates is not stable enough, the process is difficult to precisely control, and the structure of metal anode plates is coarse, etc. The problem is to reduce the pollution of other impurities, the process is simple and stable, and the content of impurities is small.

Active Publication Date: 2014-06-25
威科赛乐微电子股份有限公司
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  • Claims
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Problems solved by technology

[0008] This method needs to first cast indium into a metal anode plate. During the casting process, it is easy to cause the internal structure of the indium metal anode plate to be coarse, with pores, etc., and in a large number of castings, some processes are difficult to accurately control, making the metal anode plate The quality is not stable enough and the scrap rate is high
[0009] It can be seen that there are certain shortcomings in the preparation of indium sulfate in the prior art

Method used

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  • Method and device for preparing indium sulfate

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preparation example Construction

[0035] A kind of indium sulfate preparation method provided by the invention comprises steps:

[0036] A. Heating the indium raw material, filtering it, and dropping the filtrate onto a quartz plate with running water on the surface to produce indium with a high specific surface area;

[0037] B. Heating and stirring a mixed solution composed of high specific surface area indium, water and concentrated sulfuric acid, adding water during heating to keep the total amount of the mixed solution constant, to obtain an indium sulfate solution;

[0038] C, filter, evaporate indium sulfate solution, crystallization obtains indium sulfate pentahydrate;

[0039] D. Roasting and heat preservation of indium sulfate pentahydrate to obtain indium sulfate.

[0040] Indium is a silvery-white, bluish-tinged metal that is so soft that it can be scored with a fingernail. Indium has strong plasticity and ductility, and can be pressed into sheets.

[0041] The indium raw material is heated and ...

Embodiment 1

[0067] Follow the steps below:

[0068] Step 1. Put the indium raw material indium block into a melting material funnel with an aperture of 1mm, heat up to 300°C, and drop the indium filtrate onto the quartz plate. The surface of the quartz plate is provided with running water and the plane where it is located is at an angle of 30° to the horizontal plane. The included angle, the flow speed is 1m / S, and the thickness of the flow water is 4mm, so that a high specific surface area of ​​indium is obtained.

[0069] Step 2. Put high specific surface area indium, water and 98% concentrated sulfuric acid into the reaction kettle according to the ratio of 1kg:3000ml:700ml, heat to 150°C, and start stirring; add water continuously during the reaction process to keep the total amount of the solution unchanged; The reaction time was 2h, and an indium sulfate solution was obtained.

[0070] Step 3. Filter the indium sulfate solution, put the filtrate into an evaporation crystallization ...

Embodiment 2

[0074] The hole diameter of the melting material funnel funnel in step 1 is selected as 0.8 mm, and other conditions are the same as in Example 1, and the reaction, evaporative crystallization, and roasting are carried out to obtain indium sulfate.

[0075] The impurity content of indium sulfate was 0.000045% by sampling.

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Abstract

The invention discloses an indium sulfate preparation method which comprises the following steps: A, heating an indium raw material, filtering, and dripping filtrate on a quartz plate of which the surface is provided with flowing water so as to prepare indium with a high specific surface area; B, heating and stirring a mixed solution consisting of the indium with the high specific surface area, water and concentrated sulfuric acid, adding water during the heating process to maintain the total amount of the mixed solution so as to obtain an indium sulfate solution; C, filtering, evaporating the indium sulfate solution and crystalizing to obtain indium sulfate pentahydrate; and D, roasting the indium sulfate pentahydrate and preserving heat to obtain the indium sulfate. The method is simple and stable in process and has the effects of effectively reducing the pollution of other impurities and guaranteeing the preparation of the indium with the high specific surface area, and loss of the indium is reduced during the overall technological process. The invention also discloses a device for preparing the indium sulfate.

Description

technical field [0001] The invention relates to the field of chemistry and chemical engineering, in particular to a method and device for preparing indium sulfate. Background technique [0002] Indium sulfate is widely used in the electroplating industry, the preparation of ITO (Indium Tin Oxide) composite powder and the evaporation of ITO conductive film, etc. The indium raw material resources for the preparation of indium sulfate are rare and expensive. , have worked hard to study how to prepare better indium sulfate under the condition of the lowest consumption of indium. [0003] At present, there are three better methods for preparing indium sulfate. The first method is diaphragm electrolysis. The process includes: dissolving indium with sulfuric acid to prepare an indium sulfate solution, using a reactor to concentrate and crystallize indium sulfate, and finally using vacuum filtration or The saturated indium sulfate solution containing crystals is concentrated by fil...

Claims

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Application Information

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IPC IPC(8): C01G15/00
Inventor 文崇斌朱刘童培云胡智向罗涛
Owner 威科赛乐微电子股份有限公司
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